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Fidelity Summer Street Trust
2026-07-31
Fidelity® Series Sustainable U.S. Market Fund
Fidelity® Series Sustainable U.S. Market Fund
FSUMX
This semi-annual shareholder report contains information about Fidelity® Series Sustainable U.S. Market Fund for the period February 1, 2026 to July 31, 2026.
semi-annual shareholder report
You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544.
fundresearch.fidelity.com/prospectus/sec
1-800-544-8544
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What were your Fund costs for the last six months?</span>
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(based on hypothetical $10,000 investment)</span></div>
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
<span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
<div style="text-align:left;text-align-last:auto;"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;border-style:none;" width="100%"><tr><td style="width:51%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div>
</td>
<td style="width:21%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs of a $10,000 investment</span></div>
</td>
<td style="width:27%; background-color:#dfe0e4;border:1px solid #dfe0e4;padding:0px 0px 0px 0px;" valign="bottom"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">Costs paid as a percentage of a $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Sustainable U.S. Market Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span>0<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div>
</td>
<td style="width:27%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;">0.00<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than $.50</span></div>
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">B</span><span style="font-family:'Fidelity Sans Cd';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Amount represents less than 0.005%</span></div>
<span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
<div style="text-align:left;text-align-last:auto;"></div>
0
0.0000
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">Key Fund Statistics</span>
<div style="text-align:left;text-align-last:auto;"></div>
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">(as of July 31, 2026)</span></div>
<div><span style="font-size:11px;"> </span></div><div style="text-align:left;text-align-last:auto;"></div>
<div style="text-align:right;text-align-last:auto;"><table cellpadding="0" cellspacing="1" style="border-collapse:separate;border-style:none;margin:auto;" width="100%"><tr><td style="width:63%; " valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:bold;">KEY FACTS</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;"> </span></div>
</td>
<td style="width:32%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fund Size</span></div>
</td>
<td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$</span>70,141,697</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Number of Holdings</span></div>
</td>
<td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">723</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:63%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Portfolio Turnover</span></div>
</td>
<td style="width:32%; border-bottom:1px dashed #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:right;text-align-last:auto;">35<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="top"><span style="line-height:11px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
70141697
723
0.35
MARKET SECTORS
(% of Fund's net assets)
Information Technology
33.3
Financials
12.1
Consumer Discretionary
10.0
Health Care
10.0
Industrials
9.7
Communication Services
7.1
Energy
4.3
Consumer Staples
4.3
Materials
2.1
Real Estate
1.9
Utilities
1.4
Common Stocks
96.2
Preferred Stocks
0.0
Short-Term Investments and Net Other Assets (Liabilities)
3.8
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 96.2
Preferred Stocks - 0.0
Short-Term Investments and Net Other Assets (Liabilities) - 3.8
United States
96.3
Canada
1.1
United Kingdom
0.8
Taiwan
0.5
Netherlands
0.3
Belgium
0.2
Puerto Rico
0.1
Switzerland
0.1
Japan
0.1
Others
0.5
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 96.3
Canada - 1.1
United Kingdom - 0.8
Taiwan - 0.5
Netherlands - 0.3
Belgium - 0.2
Puerto Rico - 0.1
Switzerland - 0.1
Japan - 0.1
Others - 0.5
0.333
0.121
0.100
0.100
0.097
0.071
0.043
0.043
0.021
0.019
0.014
0.962
0.000
0.038
0.963
0.011
0.008
0.005
0.003
0.002
0.001
0.001
0.001
0.005
TOP HOLDINGS(% of Fund's net assets)
NVIDIA Corp
6.9
Apple Inc
6.0
Amazon.com Inc
4.9
Microsoft Corp
4.5
Alphabet Inc Class A
3.3
Broadcom Inc
2.2
Alphabet Inc Class C
1.8
ExxonMobil Holdings Corp
1.7
Eli Lilly & Co
1.2
Micron Technology Inc
1.1
33.6
0.069
0.060
0.049
0.045
0.033
0.022
0.018
0.017
0.012
0.011