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Class R6
Class A
MIAAX
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Class R2
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semi-annual shareholder report
semi-annual shareholder report
semi-annual shareholder report
semi-annual shareholder report
semi-annual shareholder report
semi-annual shareholder report
semi-annual shareholder report
semi-annual shareholder report
semi-annual shareholder report
MFS SERIES TRUST IX
2026-04-30
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_10_51996c33_f3cc_827c_99ed_9eabf0845e60;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
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<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
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<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
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<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>33</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">0.66<span>%</span></td>
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33
0.0066
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
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<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
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<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
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<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
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<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
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<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
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<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
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<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
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<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_20_62afe190_2697_c6e4_426b_f1563616178d;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">B</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>70</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">1.40<span>%</span></td>
</tr>
</table>
70
0.0140
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden:t_30_d10f27e9_9056_a521_84ad_0f9216aab11c">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">C</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>75</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">1.51<span>%</span></td>
</tr>
</table>
75
0.0151
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_38_e72a71c1_4951_623e_f8ce_6510f446a317;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">I</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>25</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">0.51<span>%</span></td>
</tr>
</table>
25
0.0051
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_47_a4a00fb4_37f2_3396_06ac_6058487207a9;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">R1</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>75</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">1.51<span>%</span></td>
</tr>
</table>
75
0.0151
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_56_6eac6b0b_97d9_32ef_bd9e_35f44a059b81;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">R2</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>50</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">1.01<span>%</span></td>
</tr>
</table>
50
0.0101
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_65_eece8d27_6b2b_89f9_a6d4_e3aa4dcd1ef9;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">R3</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>38</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">0.76<span>%</span></td>
</tr>
</table>
38
0.0076
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_74_b0e9899b_bbbf_103c_87ec_840e1f341d8d;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">R4</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>25</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">0.51<span>%</span></td>
</tr>
</table>
25
0.0051
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
MFS® Inflation-AdjustedBond Fund
This <span class="sec-hidden" style="-sec-ix-hidden: t_83_a3f8e194_2499_74ab_ff11_64076ad44034;">semiannual shareholder report</span> contains important information about MFS Inflation-Adjusted Bond Fund for the period of November 1, 2025 to April 30, 2026.
You can find additional information about the fund at <span style="text-decoration-line: underline; color: rgb(45, 126, 201); font-family: 'arial'; font-weight: normal; font-size: 11pt;">funds.mfs.com</span>. You can also request this information by contacting us at 1‑800‑225‑2606 or by sending an e-mail request to orderliterature@mfs.com.
funds.mfs.com
1‑800‑225‑2606
orderliterature@mfs.com
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND EXPENSES</div>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(126, 45, 64); font-size: 12pt; text-align: left; margin: 0px 0px 6pt 0px;">What were the fund costs for the last six months?</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;">(based on a hypothetical $10,000 investment)</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; vertical-align: bottom; font-style: italic; font-size: 10pt; text-align: center; color: rgb(0, 0, 0); width: 533pt; position: absolute; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 2pt 3pt 0 3pt;"></td>
</tr>
<tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Class Name</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; padding: 0 3pt 0 3pt;">Costs of a $10,000 investment</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; font-weight: normal; text-align: center; vertical-align: middle; border-right-color: initial; border-right-style: none; border-right-width: initial; padding: 0 3pt 0 3pt;">Costs paid as a percentage of a $10,000 investment (annualized)</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: rgb(128, 128, 128); border-top-style: solid; border-top-width: 1pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; font-weight: normal; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">R6</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; border-right-color: rgb(128, 128, 128); border-right-style: solid; border-right-width: 1pt; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;"><span style="float: none;">$</span>20</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; white-space: nowrap; border-right-color: initial; border-right-style: none; border-right-width: initial; text-align: center; vertical-align: middle; padding: 0 3pt 0 3pt;">0.41<span>%</span></td>
</tr>
</table>
20
0.0041
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">FUND STATISTICS AS OF 4/30/26</div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Net Assets ($):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">1,511,260,673</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Maturity (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">7.2</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Total Number of Holdings:</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">108</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; padding: 0 3pt 0 3pt;">Average Effective Duration (yrs):</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 0 3pt 0 3pt;">6.9</td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-top-color: initial; border-top-style: none; border-top-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;">
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; padding: 0 3pt 0 3pt;">Portfolio Turnover Rate (%):</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 72pt; text-align: right; padding: 0 3pt 0 3pt;">10</td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-weight: bold; text-align: left; font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; border-left-color: initial; border-left-style: none; border-left-width: initial; width: 178pt; font-weight: normal; text-align: left; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
<td style="break-inside: avoid-page; page-break-inside: avoid; vertical-align: middle; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 9pt; width: 72pt; font-weight: normal; text-align: right; border-left-color: initial; border-left-style: none; border-left-width: initial; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 0 3pt 0 3pt;"></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Where the fund holds derivatives, they are not included in the total number of portfolio holdings.</div>
1511260673
108
0.10
<div style="font-family: 'arial'; font-size: 11.52pt; font-weight: bold; color: rgb(126, 45, 64); margin: 0px 0px 3pt 0px;">PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 4/30/26)</div>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Portfolio structure</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Fixed Income</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">99.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: left; vertical-align: bottom; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: right; font-size: 10pt; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; color: rgb(0, 0, 0); letter-spacing: normal; font-size: 10pt; text-align: left; font-weight: bold; margin: 12pt 0px 3pt 0px;"><b>Composition including fixed income credit quality</b></div>
<table style="table-layout: auto; width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid;">
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt; border-top-color: initial; border-top-style: none; border-top-width: initial;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AAA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">2.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">AA</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">1.2<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">A</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.3<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">U.S. Government</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">89.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Federal Agencies</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">5.7<span>%</span></td>
</tr>
<tr style="break-inside: avoid-page; page-break-inside: avoid; height: 16pt; border-bottom-color: rgb(128, 128, 128); border-bottom-style: solid; border-bottom-width: 1pt;">
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; vertical-align: bottom; text-align: left; padding: 2pt 3pt 2pt 3pt;">Money Market Funds</td>
<td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 10pt; text-align: right; vertical-align: bottom; width: 50pt; white-space: nowrap; padding: 2pt 3pt 2pt 3pt;">0.8<span>%</span></td>
</tr>
</table>
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>
0.992
0.008
0.023
0.012
0.003
0.897
0.057
0.008
<div style="font-family: 'arial'; font-weight: normal; color: rgb(0, 0, 0); font-size: 8pt; margin: 0px 0px 6pt 0px;">Ratings are assigned using Moody’s, Fitch, and Standard & Poor’s and applying a hierarchy: If all 3 agencies rate a security, the middle rating is assigned; if 2 agencies rate a security, the lower rating is assigned. If none of the 3 agencies rate a security, we use DBRS Morningstar. If none of the 4 agencies rate a security, we use Kroll Bond Rating Agency. Ratings are shown in the S&P and Fitch scale (e.g., AAA). All ratings are subject to change.</div>