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Fidelity Salem Street Trust
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Fidelity® Small Cap Index Fund
Fidelity® Small Cap Index Fund
FSSNX
This annual shareholder report contains information about Fidelity® Small Cap Index Fund for the period May 1, 2025 to April 30, 2026.
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 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-8544
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Small Cap Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>3<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </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;">0.03<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</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;"></div>
3
0.0003
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, industrials gained about 67% and contributed most to the fund's performance for the fiscal year, driven by the capital goods industry (+90%). Information technology, which gained approximately 67%, also helped, as did health care, which advanced approximately 39%, lifted by the pharmaceuticals, biotechnology & life sciences industry (+64%). The financials sector rose approximately 25%, while energy gained approximately 96% and materials advanced roughly 64%. Other contributors included the consumer discretionary (+23%), real estate (+24%), communication services (+57%), utilities (+17%) and consumer staples (+3%) sectors.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, the top contributor was Bloom Energy (+1444%), from the capital goods group. Another notable contributor was Credo Technology (+304%), a stock in the semiconductors & semiconductor equipment industry. Fabrinet (+233%) and TTM Technologies (+688%), from the technology hardware & equipment category, helped. Lastly, EchoStar (+447%), from the media & entertainment category, also boosted the fund.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the biggest detractor was SPS Commerce (-61%), from the software & services category. From the same category, Commvault Systems (-41%) hurt the fund. In pharmaceuticals, biotechnology & life sciences, ADMA Biologics (-57%) hurt the fund. In technology hardware & equipment, Badger Meter returned -45% and hindered the fund. Lastly, in capital goods, Aebi Schmidt Holding returned about 5% and also detracted.</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the past 10 years?
CUMULATIVE PERFORMANCE
April 30, 2016 through April 30, 2026.
Initial investment of $10,000.
Fidelity® Small Cap Index Fund
$10,000
$12,590
$14,067
$14,734
$12,337
$21,584
$17,938
$17,318
$19,647
$19,851
$28,696
Russell 2000® Index
$10,000
$12,563
$14,012
$14,658
$12,256
$21,437
$17,821
$17,171
$19,459
$19,629
$28,347
Russell 3000® Index
$10,000
$11,858
$13,406
$15,106
$14,948
$22,560
$21,857
$22,186
$27,133
$30,227
$39,601
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Small Cap Index Fund</span>
10000
12590
14067
14734
12337
21584
17938
17318
19647
19851
28696
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 2000® Index</span>
10000
12563
14012
14658
12256
21437
17821
17171
19459
19629
28347
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>
10000
11858
13406
15106
14948
22560
21857
22186
27133
30227
39601
AVERAGE ANNUAL TOTAL RETURNS:
1 Year
5 Year
10 Year
Fidelity® Small Cap Index Fund
44.56%
5.86%
11.12%
Russell 2000® Index
44.41%
5.75%
10.98%
Russell 3000® Index
31.01%
11.91%
14.75%
Visit www.fidelity.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
0.4456
0.0586
0.1112
0.4441
0.0575
0.1098
0.3101
0.1191
0.1475
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>32,562,648,785</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;">1,929</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;">Total Advisory Fee</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>6,979,883</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">20<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
32562648785
1929
6979883
0.20
MARKET SECTORS
(% of Fund's net assets)
Industrials
19.2
Financials
16.6
Health Care
16.3
Information Technology
16.2
Consumer Discretionary
8.0
Energy
6.3
Real Estate
5.2
Materials
4.8
Utilities
2.8
Communication Services
2.5
Consumer Staples
1.7
Common Stocks
99.6
Short-Term Investments and Net Other Assets (Liabilities)
0.4
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.6
Short-Term Investments and Net Other Assets (Liabilities) - 0.4
United States
96.0
Canada
1.1
Thailand
0.8
Switzerland
0.3
Puerto Rico
0.3
Norway
0.2
United Kingdom
0.2
Cameroon
0.2
Monaco
0.1
Others
0.8
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 96.0
Canada - 1.1
Thailand - 0.8
Switzerland - 0.3
Puerto Rico - 0.3
Norway - 0.2
United Kingdom - 0.2
Cameroon - 0.2
Monaco - 0.1
Others - 0.8
0.192
0.166
0.163
0.162
0.080
0.063
0.052
0.048
0.028
0.025
0.017
0.996
0.004
0.960
0.011
0.008
0.003
0.003
0.002
0.002
0.002
0.001
0.008
TOP HOLDINGS(% of Fund's net assets)
Bloom Energy Corp Class A
2.0
Credo Technology Group Holding Ltd
1.0
Fabrinet
0.8
Coeur Mining Inc
0.7
Nextpower Inc Class A
0.6
EchoStar Corp Class A
0.6
TTM Technologies Inc
0.6
IonQ Inc
0.5
Sterling Infrastructure Inc
0.5
Advanced Energy Industries Inc
0.5
7.8
0.020
0.010
0.008
0.007
0.006
0.006
0.006
0.005
0.005
0.005
2026-04-30
This report describes changes to the Fund that occurred during the reporting period.
Fidelity® Series Large Cap Growth Index Fund
Fidelity® Series Large Cap Growth Index Fund
FHOFX
This annual shareholder report contains information about Fidelity® Series Large Cap Growth Index Fund for the period May 1, 2025 to April 30, 2026.
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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Large Cap Growth Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>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;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, information technology gained 39% and contributed most to the fund's performance for the fiscal year, driven by the semiconductors & semiconductor equipment industry (+101%). Communication services stocks also helped (+52%), benefiting from the media & entertainment industry (+52%). Consumer discretionary rose approximately 25%, industrials gained 29%, lifted by the capital goods industry (+65%), and health care advanced 3%. Other contributors included the consumer staples (+6%), energy (+38%), utilities (+28%) and materials (+1%) sectors.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, financials returned -3% and detracted most. This group was hampered by the financial services industry (-3%). Real estate (-7%) also hurt, hampered by the equity real estate investment trusts industry (-6%).</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, the biggest contributor was NVIDIA (+83%), from the semiconductors & semiconductor equipment industry. Within the same group, Broadcom gained approximately 118% and boosted the fund. Alphabet, within the media & entertainment industry, gained roughly 142% and boosted the fund. In technology hardware & equipment, Apple (+28%) boosted the fund. Lastly, Amazon.com (+45%), from the consumer discretionary distribution & retail industry, also helped.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the biggest detractor was ServiceNow (-54%), from the software & services industry. From the same industry, Intuit (-38%) and Adobe (-34%) hurt the fund's performance. Netflix (-17%), a stock in the media & entertainment industry, detracted. Lastly, Mastercard, within the financial services group, returned approximately -8% and also hindered the fund.</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the life of Fund?
CUMULATIVE PERFORMANCE
August 17, 2018 through April 30, 2026.
Initial investment of $10,000.
Fidelity® Series Large Cap Growth Index Fund
$10,000
$10,597
$11,738
$17,749
$16,801
$17,203
$22,692
$25,987
$33,940
Russell 1000® Growth Index
$10,000
$10,588
$11,735
$17,768
$16,818
$17,211
$22,684
$25,980
$33,938
Russell 1000® Index
$10,000
$10,462
$10,471
$15,652
$15,324
$15,603
$19,163
$21,452
$27,977
2018
2019
2020
2021
2022
2023
2024
2025
2026
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series Large Cap Growth Index Fund</span>
10000
10597
11738
17749
16801
17203
22692
25987
33940
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Growth Index</span>
10000
10588
11735
17768
16818
17211
22684
25980
33938
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Index</span>
10000
10462
10471
15652
15324
15603
19163
21452
27977
AVERAGE ANNUAL TOTAL RETURNS:
1 Year
5 Year
Life of Fund A
Fidelity® Series Large Cap Growth Index Fund
30.60%
13.84%
17.18%
Russell 1000® Growth Index
30.63%
13.82%
17.18%
Russell 1000® Index
30.42%
12.32%
14.28%
A From August 17, 2018
Visit www.fidelity.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
0.3060
0.1384
0.1718
0.3063
0.1382
0.1718
0.3042
0.1232
0.1428
2018-08-17
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>2,471,367,882</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;">391</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;">Total Advisory Fee</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>0</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">34<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
2471367882
391
0
0.34
MARKET SECTORS
(% of Fund's net assets)
Information Technology
50.5
Communication Services
12.9
Consumer Discretionary
12.7
Health Care
7.1
Industrials
6.6
Financials
5.6
Consumer Staples
2.7
Real Estate
0.4
Energy
0.4
Materials
0.3
Utilities
0.3
Common Stocks
99.5
Short-Term Investments and Net Other Assets (Liabilities)
0.5
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.5
Short-Term Investments and Net Other Assets (Liabilities) - 0.5
United States
99.6
Brazil
0.2
Korea (South)
0.1
Canada
0.1
Switzerland
0.0
Australia
0.0
Kazakhstan
0.0
Puerto Rico
0.0
Germany
0.0
Grand Cayman (UK Overseas Ter)
0.0
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 99.6
Brazil - 0.2
Korea (South) - 0.1
Canada - 0.1
Switzerland - 0.0
Australia - 0.0
Kazakhstan - 0.0
Puerto Rico - 0.0
Germany - 0.0
Grand Cayman (UK Overseas Ter) - 0.0
0.505
0.129
0.127
0.071
0.066
0.056
0.027
0.004
0.004
0.003
0.003
0.995
0.005
0.996
0.002
0.001
0.001
0.000
0.000
0.000
0.000
0.000
0.000
TOP HOLDINGS(% of Fund's net assets)
NVIDIA Corp
13.3
Apple Inc
11.2
Microsoft Corp
8.8
Broadcom Inc
5.9
Amazon.com Inc
4.9
Alphabet Inc Class A
4.3
Alphabet Inc Class C
3.4
Meta Platforms Inc Class A
3.3
Tesla Inc
3.3
Eli Lilly & Co
2.4
60.8
0.133
0.112
0.088
0.059
0.049
0.043
0.034
0.033
0.033
0.024
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</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>
<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;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><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>
<span style="line-height:11px;"> </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:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><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;">The fund modified its principal investment strategies during the reporting period. </span>
<div style="text-align:left;text-align-last:auto;"></div></div>
<div style="text-align:left;text-align-last:auto;"></div>
</td>
<td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><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:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period. </span>
<div style="text-align:left;text-align-last:auto;"></div>
2026-04-30
Fidelity® Mid Cap Index Fund
Fidelity® Mid Cap Index Fund
FSMDX
This annual shareholder report contains information about Fidelity® Mid Cap Index Fund for the period May 1, 2025 to April 30, 2026.
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 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-8544
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Mid Cap Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>3<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </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;">0.03<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</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;"></div>
3
0.0003
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, information technology gained 66% and contributed most to the fund's performance for the fiscal year, driven by the technology hardware & equipment industry (+198%). Industrials, which gained 38%, also helped, benefiting from the capital goods industry (+53%), as did energy, which advanced 56%. The financials sector rose approximately 14%, while consumer discretionary gained 15% and materials advanced 29%. Other contributors included the utilities (+16%), health care (+11%), real estate (+7%) and communication services (+10%) sectors.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, consumer staples returned roughly -2% and detracted most. This group was hampered by the household & personal products industry (-21%).</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, the biggest contributor was Western Digital (+894%), from the technology hardware & equipment category. From the same industry, Corning (+276%) and Ciena (+686%) lifted the fund. Lastly, Vertiv Holdings (+285%) and Quanta Services (+149%), within the capital goods category, also boosted the fund.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the biggest detractor was Flutter Entertainment (-61%), from the consumer services category. Fair Isaac (-48%), Gartner (-65%) and HubSpot (-64%), within the software & services industry, hurt the fund's performance. Lastly, Charter Communications (-58%), from the media & entertainment group, also detracted.</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the past 10 years?
CUMULATIVE PERFORMANCE
April 30, 2016 through April 30, 2026.
Initial investment of $10,000.
Fidelity® Mid Cap Index Fund
$10,000
$11,670
$12,969
$14,353
$12,920
$20,618
$19,356
$19,036
$22,146
$23,767
$29,897
Russell Midcap® Index
$10,000
$11,670
$12,973
$14,360
$12,924
$20,623
$19,365
$19,038
$22,151
$23,775
$29,905
Russell 3000® Index
$10,000
$11,858
$13,406
$15,106
$14,948
$22,560
$21,857
$22,186
$27,133
$30,227
$39,601
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Mid Cap Index Fund</span>
10000
11670
12969
14353
12920
20618
19356
19036
22146
23767
29897
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell Midcap® Index</span>
10000
11670
12973
14360
12924
20623
19365
19038
22151
23775
29905
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>
10000
11858
13406
15106
14948
22560
21857
22186
27133
30227
39601
AVERAGE ANNUAL TOTAL RETURNS:
1 Year
5 Year
10 Year
Fidelity® Mid Cap Index Fund
25.79%
7.71%
11.57%
Russell Midcap® Index
25.78%
7.72%
11.58%
Russell 3000® Index
31.01%
11.91%
14.75%
Visit www.fidelity.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
0.2579
0.0771
0.1157
0.2578
0.0772
0.1158
0.3101
0.1191
0.1475
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>50,042,693,940</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;">808</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;">Total Advisory Fee</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>11,166,100</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">12<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
50042693940
808
11166100
0.12
MARKET SECTORS
(% of Fund's net assets)
Industrials
19.3
Information Technology
14.8
Financials
13.7
Consumer Discretionary
10.5
Health Care
8.6
Energy
7.1
Real Estate
6.8
Utilities
6.1
Materials
5.2
Consumer Staples
4.3
Communication Services
3.4
Common Stocks
99.8
Short-Term Investments and Net Other Assets (Liabilities)
0.2
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.8
Short-Term Investments and Net Other Assets (Liabilities) - 0.2
United States
98.4
Canada
0.4
Australia
0.3
United Kingdom
0.2
Korea (South)
0.2
Bermuda
0.1
Puerto Rico
0.1
Guatemala
0.1
Switzerland
0.1
Brazil
0.1
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 98.4
Canada - 0.4
Australia - 0.3
United Kingdom - 0.2
Korea (South) - 0.2
Bermuda - 0.1
Puerto Rico - 0.1
Guatemala - 0.1
Switzerland - 0.1
Brazil - 0.1
0.193
0.148
0.137
0.105
0.086
0.071
0.068
0.061
0.052
0.043
0.034
0.998
0.002
0.984
0.004
0.003
0.002
0.002
0.001
0.001
0.001
0.001
0.001
TOP HOLDINGS(% of Fund's net assets)
Sandisk Corp/DE
1.2
Western Digital Corp
1.1
Corning Inc
1.0
Vertiv Holdings Co Class A
1.0
Quanta Services Inc
0.8
Howmet Aerospace Inc
0.8
Bank of New York Mellon Corp/The
0.8
Cummins Inc
0.8
Valero Energy Corp
0.6
Monolithic Power Systems Inc
0.6
8.7
0.012
0.011
0.010
0.010
0.008
0.008
0.008
0.008
0.006
0.006
2026-04-30
This report describes changes to the Fund that occurred during the reporting period.
Fidelity® Large Cap Value Index Fund
Fidelity® Large Cap Value Index Fund
FLCOX
This annual shareholder report contains information about Fidelity® Large Cap Value Index Fund for the period May 1, 2025 to April 30, 2026.
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 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-8544
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Large Cap Value Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>4<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </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;">0.04<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</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;"></div>
4
0.0004
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, information technology gained approximately 90% and contributed most to the fund's performance for the fiscal year. Industrials, which gained approximately 40%, also helped, benefiting from the capital goods industry (+46%), as did financials, which advanced 14%, lifted by the banks industry (+36%). The energy sector rose 54%, while communication services gained 44% and consumer discretionary advanced 18%. Other contributors included the materials (+30%), health care (+9%), utilities (+21%), consumer staples (+8%) and real estate (+14%) sectors.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, the top contributor was Alphabet (+115%), from the media & entertainment category. Micron Technology (+571%) and Intel (+370%), from the semiconductors & semiconductor equipment category, helped. Another notable contributor was Caterpillar (+190%), a stock in the capital goods industry. Lastly, Exxon Mobil (+51%), from the energy sector, also boosted the fund.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, the biggest detractor was Berkshire Hathaway (-11%), from the financial services category. In software & services, Salesforce (-34%) and Accenture (-39%) hurt. Lastly, Abbott Laboratories (-29%) and Boston Scientific (-44%), from the health care equipment & services industry, also hurt the fund.</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the life of Fund?
CUMULATIVE PERFORMANCE
June 7, 2016 through April 30, 2026.
Initial investment of $10,000.
Fidelity® Large Cap Value Index Fund
$10,000
$11,348
$12,205
$13,321
$11,850
$17,294
$17,514
$17,720
$20,110
$21,824
$28,198
Russell 1000® Value Index
$10,000
$11,355
$12,207
$13,314
$11,848
$17,289
$17,516
$17,729
$20,108
$21,828
$28,213
Russell 1000® Index
$10,000
$11,501
$13,015
$14,750
$14,763
$22,068
$21,605
$21,997
$27,017
$30,244
$39,444
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Large Cap Value Index Fund</span>
10000
11348
12205
13321
11850
17294
17514
17720
20110
21824
28198
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Value Index</span>
10000
11355
12207
13314
11848
17289
17516
17729
20108
21828
28213
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Index</span>
10000
11501
13015
14750
14763
22068
21605
21997
27017
30244
39444
AVERAGE ANNUAL TOTAL RETURNS:
1 Year
5 Year
Life of Fund A
Fidelity® Large Cap Value Index Fund
29.21%
10.27%
11.04%
Russell 1000® Value Index
29.25%
10.29%
11.04%
Russell 1000® Index
30.42%
12.32%
14.87%
A From June 7, 2016
Visit www.fidelity.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
0.2921
0.1027
0.1104
0.2925
0.1029
0.1104
0.3042
0.1232
0.1487
2016-06-07
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>13,339,586,246</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;">870</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;">Total Advisory Fee</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>4,199,216</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">21<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
13339586246
870
4199216
0.21
MARKET SECTORS
(% of Fund's net assets)
Financials
19.4
Information Technology
14.2
Industrials
13.5
Health Care
10.8
Communication Services
8.4
Consumer Staples
7.2
Consumer Discretionary
7.0
Energy
6.9
Utilities
4.4
Materials
4.1
Real Estate
3.9
Common Stocks
99.8
Short-Term Investments and Net Other Assets (Liabilities)
0.2
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.8
Short-Term Investments and Net Other Assets (Liabilities) - 0.2
United States
99.5
Canada
0.2
Australia
0.2
United Kingdom
0.1
Mexico
0.0
Bermuda
0.0
Puerto Rico
0.0
Guatemala
0.0
Brazil
0.0
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 99.5
Canada - 0.2
Australia - 0.2
United Kingdom - 0.1
Mexico - 0.0
Bermuda - 0.0
Puerto Rico - 0.0
Guatemala - 0.0
Brazil - 0.0
0.194
0.142
0.135
0.108
0.084
0.072
0.070
0.069
0.044
0.041
0.039
0.998
0.002
0.995
0.002
0.002
0.001
0.000
0.000
0.000
0.000
0.000
TOP HOLDINGS(% of Fund's net assets)
Berkshire Hathaway Inc Class B
2.8
JPMorgan Chase & Co
2.7
Alphabet Inc Class A
2.5
Amazon.com Inc
2.2
Exxon Mobil Corp
2.1
Alphabet Inc Class C
2.0
Micron Technology Inc
1.8
Johnson & Johnson
1.8
Walmart Inc
1.6
Intel Corp
1.3
20.8
0.028
0.027
0.025
0.022
0.021
0.020
0.018
0.018
0.016
0.013
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</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>
<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;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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>
<span style="line-height:11px;"> </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:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><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;">The fund modified its principal investment strategies during the reporting period. </span>
<div style="text-align:left;text-align-last:auto;"></div></div>
<div style="text-align:left;text-align-last:auto;"></div>
</td>
<td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period. </span>
<div style="text-align:left;text-align-last:auto;"></div>
2026-04-30
This report describes changes to the Fund that occurred during the reporting period.
Fidelity® Large Cap Growth Index Fund
Fidelity® Large Cap Growth Index Fund
FSPGX
This annual shareholder report contains information about Fidelity® Large Cap Growth Index Fund for the period May 1, 2025 to April 30, 2026.
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 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-8544
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Large Cap Growth Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>4<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </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;">0.04<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</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;"></div>
4
0.0004
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, information technology gained roughly 39% and contributed most to the fund's performance for the fiscal year, driven by the semiconductors & semiconductor equipment industry (+102%). Communication services stocks also helped (+52%), benefiting from the media & entertainment industry (+52%). Consumer discretionary rose about 25%, industrials gained 29%, lifted by the capital goods industry (+65%), and health care advanced about 3%. Other contributors included the consumer staples (+6%), energy (+38%), utilities (+28%) and materials (+1%) sectors.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, financials returned -3% and detracted most. This group was hampered by the financial services industry (-3%). Real estate (-6%) also hurt, hampered by the equity real estate investment trusts industry (-6%).</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, the top contributor was NVIDIA (+83%), from the semiconductors & semiconductor equipment industry. Within the same group, Broadcom gained about 119% and helped. Alphabet (+142%), from the media & entertainment industry, lifted the fund. Apple (+28%), a stock in the technology hardware & equipment category, lifted the fund. Lastly, Amazon.com (+45%), from the consumer discretionary distribution & retail category, also lifted the fund.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, the biggest detractor was ServiceNow (-54%), from the software & services group. From the same industry, Intuit (-38%) and Adobe (-34%) hindered the fund. Another notable detractor was Netflix (-17%), a stock in the media & entertainment group. Lastly, in financial services, Mastercard returned roughly -8% and also detracted.</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the life of Fund?
CUMULATIVE PERFORMANCE
June 7, 2016 through April 30, 2026.
Initial investment of $10,000.
Fidelity® Large Cap Growth Index Fund
$10,000
$11,634
$13,832
$16,230
$17,990
$27,226
$25,757
$26,356
$34,750
$39,775
$51,944
Russell 1000® Growth Index
$10,000
$11,645
$13,853
$16,268
$18,030
$27,300
$25,840
$26,444
$34,853
$39,917
$52,144
Russell 1000® Index
$10,000
$11,501
$13,015
$14,750
$14,763
$22,068
$21,605
$21,997
$27,017
$30,244
$39,444
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Large Cap Growth Index Fund</span>
10000
11634
13832
16230
17990
27226
25757
26356
34750
39775
51944
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Growth Index</span>
10000
11645
13853
16268
18030
27300
25840
26444
34853
39917
52144
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Index</span>
10000
11501
13015
14750
14763
22068
21605
21997
27017
30244
39444
AVERAGE ANNUAL TOTAL RETURNS:
1 Year
5 Year
Life of Fund A
Fidelity® Large Cap Growth Index Fund
30.59%
13.79%
18.10%
Russell 1000® Growth Index
30.63%
13.82%
18.15%
Russell 1000® Index
30.42%
12.32%
14.87%
A From June 7, 2016
Visit www.fidelity.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
0.3059
0.1379
0.1810
0.3063
0.1382
0.1815
0.3042
0.1232
0.1487
2016-06-07
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.fidelity.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>44,086,672,150</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;">392</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;">Total Advisory Fee</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>14,067,279</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">16<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
44086672150
392
14067279
0.16
MARKET SECTORS
(% of Fund's net assets)
Information Technology
50.5
Communication Services
12.9
Consumer Discretionary
12.7
Health Care
7.1
Industrials
6.6
Financials
5.6
Consumer Staples
2.7
Real Estate
0.4
Energy
0.4
Materials
0.3
Utilities
0.3
Common Stocks
99.5
Short-Term Investments and Net Other Assets (Liabilities)
0.5
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.5
Short-Term Investments and Net Other Assets (Liabilities) - 0.5
United States
99.6
Brazil
0.2
Korea (South)
0.1
Canada
0.1
Switzerland
0.0
Australia
0.0
Kazakhstan
0.0
Puerto Rico
0.0
Germany
0.0
Grand Cayman (UK Overseas Ter)
0.0
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 99.6
Brazil - 0.2
Korea (South) - 0.1
Canada - 0.1
Switzerland - 0.0
Australia - 0.0
Kazakhstan - 0.0
Puerto Rico - 0.0
Germany - 0.0
Grand Cayman (UK Overseas Ter) - 0.0
0.505
0.129
0.127
0.071
0.066
0.056
0.027
0.004
0.004
0.003
0.003
0.995
0.005
0.996
0.002
0.001
0.001
0.000
0.000
0.000
0.000
0.000
0.000
TOP HOLDINGS(% of Fund's net assets)
NVIDIA Corp
13.3
Apple Inc
11.2
Microsoft Corp
8.8
Broadcom Inc
5.9
Amazon.com Inc
4.9
Alphabet Inc Class A
4.3
Alphabet Inc Class C
3.4
Meta Platforms Inc Class A
3.3
Tesla Inc
3.3
Eli Lilly & Co
2.4
60.8
0.133
0.112
0.088
0.059
0.049
0.043
0.034
0.033
0.033
0.024
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</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>
<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;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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>
<span style="line-height:11px;"> </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:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><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;">The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:</span>
<div style="text-align:left;text-align-last:auto;"></div>
<ul style="color:#000000;list-style-type:disc;margin:0px 0px 0px 25px;padding:0px;"><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Expense reductions</span></li></ul>
<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></div>
<div style="text-align:left;text-align-last:auto;"></div>
</td>
<td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><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;">The fund modified its principal investment strategies during the reporting period. </span>
<div style="text-align:left;text-align-last:auto;"><br/></div></div>
<div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes:</span>
<div style="text-align:left;text-align-last:auto;"></div>
<ul style="color:#000000;list-style-type:disc;margin:0px 0px 0px 25px;padding:0px;"><li style="margin:5px 0px 2px 24px;padding:0px 0px 0px 0px;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Expense reductions</span></li></ul>
<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>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund modified its principal investment strategies during the reporting period. </span>
<div style="text-align:left;text-align-last:auto;"><br/></div>
2026-04-30
This report describes changes to the Fund that occurred during the reporting period.
Fidelity Flex® Small Cap Index Fund
Fidelity Flex® Small Cap Index Fund
FLXSX
This annual shareholder report contains information about Fidelity Flex® Small Cap Index Fund for the period May 1, 2025 to April 30, 2026.
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 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-3455
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Small Cap Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>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;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, industrials gained approximately 61% and contributed most to the fund's performance for the fiscal year, driven by the capital goods industry (+81%). Information technology, which gained approximately 71%, also helped, as did health care, which advanced 44%, lifted by the pharmaceuticals, biotechnology & life sciences industry (+68%). The financials sector rose about 21%, while energy gained 92% and consumer discretionary advanced approximately 23%. Other contributors included the materials (+61%), communication services (+57%), real estate (+26%), utilities (+10%) and consumer staples (+3%) sectors.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, the top contributor was Bloom Energy (+1020%), from the capital goods industry. Within the same group, Rocket Lab gained 105% and contributed. In pharmaceuticals, biotechnology & life sciences, Revolution Medicines gained approximately 254% and lifted the fund. Another notable contributor was Credo Technology (+273%), a stock in the semiconductors & semiconductor equipment industry. Lastly, in media & entertainment, EchoStar gained roughly 485% and also lifted the fund.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, the biggest detractor was Shift4 Payments (-57%), from the financial services industry. From the same industry, Rocket returned 19% and hurt the fund. Gitlab (-51%), from the software & services industry, detracted. Chewy (-35%), a stock in the consumer discretionary distribution & retail category, hindered the fund. Lastly, ADMA Biologics, within the pharmaceuticals, biotechnology & life sciences category, returned -57% and also detracted.</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the life of Fund?
CUMULATIVE PERFORMANCE
March 9, 2017 through April 30, 2026.
Initial investment of $10,000.
Fidelity Flex® Small Cap Index Fund
$10,000
$10,310
$11,519
$12,052
$10,096
$17,670
$14,688
$14,180
$16,090
$16,243
Fidelity Flex Small Cap Linked Index℠
$10,000
$10,316
$11,506
$12,037
$10,064
$17,603
$14,634
$14,100
$15,978
$16,118
Fidelity U.S. Small Cap Index℠
$10,000
$10,310
$11,519
$12,052
$10,096
$17,670
$14,727
$14,020
$15,854
$16,223
Russell 2000® Index
$10,000
$10,316
$11,506
$12,037
$10,064
$17,603
$14,634
$14,100
$15,978
$16,118
Russell 3000® Index
$10,000
$10,131
$11,453
$12,906
$12,771
$19,274
$18,674
$18,955
$23,182
$25,825
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
Effective July 21, 2025, the fund began comparing its performance to the Fidelity U.S. Small Cap IndexSM rather than Russell 2000®Index because the Fidelity U.S. Small Cap IndexSM conforms more closely to the fund's investment policies.
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Small Cap Index Fund</span>
10000
10310
11519
12052
10096
17670
14688
14180
16090
16243
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex Small Cap Linked Index℠</span>
10000
10316
11506
12037
10064
17603
14634
14100
15978
16118
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity U.S. Small Cap Index℠</span>
10000
10310
11519
12052
10096
17670
14727
14020
15854
16223
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 2000® Index</span>
10000
10316
11506
12037
10064
17603
14634
14100
15978
16118
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>
10000
10131
11453
12906
12771
19274
18674
18955
23182
25825
AVERAGE ANNUAL TOTAL RETURNS:
1 Year
5 Year
Life of Fund
Fidelity Flex® Small Cap Index Fund A
43.17%
5.65%
9.66%
Fidelity Flex Small Cap Linked Index℠ A
43.01%
5.54%
9.56%
Fidelity U.S. Small Cap Index℠ B
44.75%
n/a
n/a
Russell 2000® Index A
44.41%
5.75%
9.68%
Russell 3000® Index A
31.01%
11.91%
14.25%
A From March 9, 2017B From April 21, 2022
Effective July 21, 2025, the fund began comparing its performance to the Fidelity U.S. Small Cap IndexSM rather than Russell 2000® Index because the Fidelity U.S. Small Cap IndexSM conforms more closely to the fund's investment policies.
Visit www.401k.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
0.4317
0.0565
0.0966
0.4301
0.0554
0.0956
0.4475
0.4441
0.0575
0.0968
0.3101
0.1191
0.1425
2017-03-09
2022-04-21
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.401k.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>411,053,777</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;">1,676</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;">Total Advisory Fee</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>0</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">80<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
411053777
1676
0
0.80
MARKET SECTORS
(% of Fund's net assets)
Financials
18.6
Health Care
16.5
Industrials
16.0
Information Technology
14.9
Consumer Discretionary
10.9
Energy
6.2
Real Estate
5.3
Materials
3.3
Communication Services
3.0
Consumer Staples
2.4
Utilities
2.2
Common Stocks
99.3
Short-Term Investments and Net Other Assets (Liabilities)
0.7
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.3
Short-Term Investments and Net Other Assets (Liabilities) - 0.7
United States
97.9
Canada
0.5
Puerto Rico
0.5
Japan
0.2
Singapore
0.2
Norway
0.1
Switzerland
0.1
Monaco
0.1
Bahamas (Nassau)
0.1
Others
0.3
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 97.9
Canada - 0.5
Puerto Rico - 0.5
Japan - 0.2
Singapore - 0.2
Norway - 0.1
Switzerland - 0.1
Monaco - 0.1
Bahamas (Nassau) - 0.1
Others - 0.3
0.186
0.165
0.160
0.149
0.109
0.062
0.053
0.033
0.030
0.024
0.022
0.993
0.007
0.979
0.005
0.005
0.002
0.002
0.001
0.001
0.001
0.001
0.003
TOP HOLDINGS(% of Fund's net assets)
Sanmina Corp
0.5
Applied Optoelectronics Inc
0.5
Semtech Corp
0.5
Oklo Inc Class A
0.4
Axsome Therapeutics Inc
0.4
Applied Digital Corp
0.4
FirstCash Holdings Inc
0.4
ESCO Technologies Inc
0.4
Lumen Technologies Inc
0.4
Viasat Inc
0.3
4.2
0.005
0.005
0.005
0.004
0.004
0.004
0.004
0.004
0.004
0.003
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</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>
<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;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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>
<span style="line-height:11px;"> </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:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><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;">The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.</span>
<div style="text-align:left;text-align-last:auto;"></div>
<div style="text-align:left;text-align-last:auto;"></div></div>
<div style="text-align:left;text-align-last:auto;"></div>
</td>
<td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by</span><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.</span>
<div style="text-align:left;text-align-last:auto;"></div>
<div style="text-align:left;text-align-last:auto;"></div>
2026-04-30
This report describes changes to the Fund that occurred during the reporting period.
Fidelity Flex® Mid Cap Index Fund
Fidelity Flex® Mid Cap Index Fund
FLAPX
This annual shareholder report contains information about Fidelity Flex® Mid Cap Index Fund for the period May 1, 2025 to April 30, 2026.
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 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-3455
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Mid Cap Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>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;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, information technology gained about 89% and contributed most to the fund's performance for the fiscal year, driven by the technology hardware & equipment industry (+339%). Industrials, which gained roughly 46%, also helped, benefiting from the capital goods industry (+60%), as did financials, which advanced about 18%. The energy sector rose 72%, while health care gained approximately 26% and materials advanced 37%. Other contributors included the consumer discretionary (+18%), utilities (+21%), communication services (+19%), real estate (+9%) and consumer staples (+1%) sectors.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, the top contributor was Sandisk (+2772%), from the technology hardware & equipment industry. From the same category, Ciena (+655%), Lumentum Holdings (+1412%) and Coherent (+437%) boosted the fund. Lastly, in capital goods, Comfort Systems USA gained approximately 316% and also boosted the fund.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, the biggest detractor was Duolingo (-72%), from the consumer services industry. In software & services, Nutanix (-41%) and Guidewire Software (-32%) hurt. Another notable detractor was Zillow (-34%), a stock in the real estate management & development industry. Lastly, Toast (-20%), from the financial services group, also hindered the fund.</span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the life of Fund?
CUMULATIVE PERFORMANCE
March 9, 2017 through April 30, 2026.
Initial investment of $10,000.
Fidelity Flex® Mid Cap Index Fund
$10,000
$10,190
$11,330
$12,548
$11,309
$18,053
$16,954
$16,680
$19,409
$20,828
Fidelity Flex Mid Cap Linked Index℠
$10,000
$10,192
$11,330
$12,542
$11,288
$18,012
$16,913
$16,627
$19,345
$20,764
Fidelity U.S. Mid Cap Index℠
$10,000
$10,190
$11,330
$12,548
$11,309
$18,053
$16,955
$16,524
$19,198
$19,785
Russell Midcap® Index
$10,000
$10,192
$11,330
$12,542
$11,288
$18,012
$16,913
$16,627
$19,345
$20,764
Russell 1000® Index
$10,000
$10,116
$11,449
$12,975
$12,986
$19,411
$19,004
$19,349
$23,765
$26,603
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
Effective August 21, 2025, the fund began comparing its performance to Fidelity U.S. Mid Cap IndexSM rather than Russell Midcap® Index because the Fidelity U.S. Mid Cap IndexSM conforms more closely to the fund's investment policies.
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Mid Cap Index Fund</span>
10000
10190
11330
12548
11309
18053
16954
16680
19409
20828
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex Mid Cap Linked Index℠</span>
10000
10192
11330
12542
11288
18012
16913
16627
19345
20764
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity U.S. Mid Cap Index℠</span>
10000
10190
11330
12548
11309
18053
16955
16524
19198
19785
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell Midcap® Index</span>
10000
10192
11330
12542
11288
18012
16913
16627
19345
20764
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Index</span>
10000
10116
11449
12975
12986
19411
19004
19349
23765
26603
AVERAGE ANNUAL TOTAL RETURNS:
1 Year
5 Year
Life of Fund
Fidelity Flex® Mid Cap Index Fund A
33.48%
9.02%
11.83%
Fidelity Flex Mid Cap Linked Index℠ A
33.50%
9.01%
11.79%
Fidelity U.S. Mid Cap Index℠ B
34.47%
n/a
n/a
Russell Midcap® Index A
25.78%
7.72%
11.06%
Russell 1000® Index A
30.42%
12.32%
14.57%
A From March 9, 2017B From April 21, 2022
Effective August 21, 2025, the fund began comparing its performance to Fidelity U.S. Mid Cap IndexSM rather than Russell Midcap® Index because the Fidelity U.S. Mid Cap IndexSM conforms more closely to the fund's investment policies.
Visit www.401k.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
0.3348
0.0902
0.1183
0.3350
0.0901
0.1179
0.3447
0.2578
0.0772
0.1106
0.3042
0.1232
0.1457
2017-03-09
2022-04-21
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.401k.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>605,831,383</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;">511</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;">Total Advisory Fee</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>0</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">89<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
605831383
511
0
0.89
MARKET SECTORS
(% of Fund's net assets)
Industrials
21.0
Financials
16.2
Information Technology
14.2
Consumer Discretionary
11.5
Health Care
11.1
Real Estate
7.7
Materials
4.2
Energy
3.6
Communication Services
3.6
Consumer Staples
3.5
Utilities
3.0
Common Stocks
99.6
Preferred Stocks
0.0
Short-Term Investments and Net Other Assets (Liabilities)
0.4
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.6
Preferred Stocks - 0.0
Short-Term Investments and Net Other Assets (Liabilities) - 0.4
United States
98.5
Thailand
0.6
Bermuda
0.3
Puerto Rico
0.2
Sweden
0.2
Switzerland
0.1
Belgium
0.1
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 98.5
Thailand - 0.6
Bermuda - 0.3
Puerto Rico - 0.2
Sweden - 0.2
Switzerland - 0.1
Belgium - 0.1
0.210
0.162
0.142
0.115
0.111
0.077
0.042
0.036
0.036
0.035
0.030
0.996
0.000
0.004
0.985
0.006
0.003
0.002
0.002
0.001
0.001
TOP HOLDINGS(% of Fund's net assets)
Astera Labs Inc
0.6
Fabrinet
0.6
nVent Electric PLC
0.6
RBC Bearings Inc
0.6
Everpure Inc Class A
0.5
BWX Technologies Inc
0.5
MKS Inc
0.5
Loews Corp
0.5
Reddit Inc Class A
0.5
Affirm Holdings Inc Class A
0.5
5.4
0.006
0.006
0.006
0.006
0.005
0.005
0.005
0.005
0.005
0.005
<div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">How has the Fund changed?</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>
<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;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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>
<span style="line-height:11px;"> </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:50%; background-color:#ebf3e9;border-right:2px dashed #368627;padding:19px 19px 19px 19px;" valign="top"><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;">The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.</span>
<div style="text-align:left;text-align-last:auto;"></div></div>
<div style="text-align:left;text-align-last:auto;"></div>
</td>
<td style="width:50%; background-color:#ebf3e9;padding:19px 19px 19px 19px;" valign="top"><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund's next prospectus, which we expect to be available by June 27, 2026 at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or upon request at </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span><span style="font-family:'Fidelity Sans';font-size:0px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> or by sending an e-mail to </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span><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:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-3455</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The fund's contractual proxy and shareholder meeting expense cap expired during the reporting period.</span>
<div style="text-align:left;text-align-last:auto;"></div>
2026-04-30
Fidelity Flex® Mid Cap Focused Index Fund
Fidelity Flex® Mid Cap Focused Index Fund
FXMCX
This annual shareholder report contains information about Fidelity Flex® Mid Cap Focused Index Fund for the period July 24, 2025 to April 30, 2026.
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 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-3455
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Mid Cap Focused Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>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;">B</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;">C</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;">Expenses for the full reporting period would be higher.</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 $.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;">C </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
Expenses for the full reporting period would be higher.
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, energy gained roughly 57% and contributed most to the fund's performance for the fiscal year, followed by industrials (+27%), health care (+22%) and information technology (+20%). Other positive performers included communication services (+6%), materials (+5%), real estate (+4%) and financials (+2%).</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, consumer staples returned roughly -12%, while consumer discretionary returned about -4%.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, Coherent (+249%), from the technology hardware & equipment category, aided the fund's result. From the same industry, Ciena (+480%) and Sandisk (+2090%) also lifted the fund. </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, Duolingo (-70%), from the consumer services category, detracted from the fund's result. Kyndryl Holdings (-64%) and Guidewire Software (-39%), within the software & services industry, also were notable detractors. </span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the life of Fund?
CUMULATIVE PERFORMANCE
July 24, 2025 through April 30, 2026.
Initial investment of $10,000.
Fidelity Flex® Mid Cap Focused Index Fund
$10,000
$11,233
Fidelity U.S. Mid Cap Focused Index℠
$10,000
$11,231
Russell 1000® Index
$10,000
$11,374
2025
2026
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Mid Cap Focused Index Fund</span>
10000
11233
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity U.S. Mid Cap Focused Index℠</span>
10000
11231
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 1000® Index</span>
10000
11374
Visit www.401k.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph does not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.401k.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph does not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>14,017,828</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;">417</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;">Total Advisory Fee</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>0</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">135<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
14017828
417
0
1.35
MARKET SECTORS
(% of Fund's net assets)
Industrials
20.8
Financials
16.2
Information Technology
14.4
Consumer Discretionary
11.5
Health Care
11.3
Real Estate
7.8
Materials
4.0
Communication Services
3.7
Energy
3.6
Consumer Staples
3.5
Utilities
2.9
Common Stocks
99.7
Short-Term Investments and Net Other Assets (Liabilities)
0.3
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.7
Short-Term Investments and Net Other Assets (Liabilities) - 0.3
United States
98.6
Bermuda
0.4
Thailand
0.4
Switzerland
0.4
Puerto Rico
0.1
Sweden
0.1
Belgium
0.0
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 98.6
Bermuda - 0.4
Thailand - 0.4
Switzerland - 0.4
Puerto Rico - 0.1
Sweden - 0.1
Belgium - 0.0
0.208
0.162
0.144
0.115
0.113
0.078
0.040
0.037
0.036
0.035
0.029
0.997
0.003
0.986
0.004
0.004
0.004
0.001
0.001
0.000
TOP HOLDINGS(% of Fund's net assets)
Astera Labs Inc
0.9
Everpure Inc Class A
0.7
BWX Technologies Inc
0.7
RBC Bearings Inc
0.7
Wesco International Inc
0.7
Affirm Holdings Inc Class A
0.6
IonQ Inc
0.6
Lattice Semiconductor Corp
0.6
API Group Corp
0.5
Annaly Capital Management Inc
0.5
6.5
0.009
0.007
0.007
0.007
0.007
0.006
0.006
0.006
0.005
0.005
2026-04-30
Fidelity Flex® Small Cap Focused Index Fund
Fidelity Flex® Small Cap Focused Index Fund
FXSCX
This annual shareholder report contains information about Fidelity Flex® Small Cap Focused Index Fund for the period July 24, 2025 to April 30, 2026.
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 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
fundresearch.fidelity.com/prospectus/sec
1-800-544-3455
fidfunddocuments@fidelity.com
<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 year?</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><span style="font-size:11px;"> </span></div><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:12px;color:#000000;font-style:normal;font-weight:bold;">FUND COST (PREVIOUS YEAR)</span></div>
<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 $10,000 investment </span></div>
</td>
<td style="width:1%; " valign="top"><span style="line-height:12px;"> </span><div style="text-align:left;text-align-last:auto;"></div>
</td>
</tr>
<tr><td style="width:51%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="top"><div style="text-align:left;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Small Cap Focused Index Fund</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> </span><span style="font-family:'Fidelity Sans';font-size:6px;color:#000000;font-style:normal;vertical-align:4px;font-weight:normal;">A</span></div>
</td>
<td style="width:21%; border-bottom:1px solid #000000;padding:0px 0px 0px 0px;" valign="middle"><div style="text-align:center;text-align-last:auto;"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">$ </span>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;">B</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;">C</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;">Expenses for the full reporting period would be higher.</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 $.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;">C </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
Expenses for the full reporting period would be higher.
<span style="font-family:'Fidelity Sans';font-size:16px;color:#368627;font-style:normal;font-weight:bold;">What affected the Fund's performance this period?</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:bold;"> </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>U.S. stocks achieved a strong gain for the 12 months ending April 30, 2026, reflecting enthusiasm for artificial intelligence, strong corporate fundamentals, a resilient economy and, beginning in September, the Federal Reserve's first interest-rate reductions since December 2024.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Against this backdrop, energy gained 46% and contributed most to the fund's performance for the fiscal year, followed by industrials (+45%), materials (+42%), health care (+42%) and information technology (+31%). Other positive performers included communication services (+27%), real estate (+16%), utilities (+12%), financials (+8%) and consumer discretionary (+8%).</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Conversely, consumer staples returned roughly -7% and detracted.</span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>Turning to individual stocks, Bloom Energy (+530%), from the capital goods category, significantly aided the fund's result. From the same industry, Rocket Lab (+76%) also helped. In pharmaceuticals, biotechnology & life sciences, Revolution Medicines (+300%) was another notable contributor. </span></div>
<div style="text-align:left;text-align-last:auto;text-indent:-24px;margin-bottom:2px;margin-left:24px;margin-top:5px;margin-right:0px;"><span style="font-family:'Fidelity Sans';font-size:12px;color:#000000;font-style:normal;font-weight:normal;">•<span style="padding-right:10px"></span>In contrast, Upstart Holdings (-62%), from the financial services category, hurt results, while other notable detractors from this segment included Shift4 Payments (-58%) and Hamilton Lane (-40%). </span></div>
<div style="text-align:left;text-align-last:auto;"></div>
How did the Fund perform over the life of Fund?
CUMULATIVE PERFORMANCE
July 24, 2025 through April 30, 2026.
Initial investment of $10,000.
Fidelity Flex® Small Cap Focused Index Fund
$10,000
$12,674
Fidelity U.S. Small Cap Focused Index℠
$10,000
$12,670
Russell 3000® Index
$10,000
$11,424
2025
2026
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Flex® Small Cap Focused Index Fund</span>
10000
12674
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity U.S. Small Cap Focused Index℠</span>
10000
12670
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>
10000
11424
Visit www.401k.com for more recent performance information.
The Fund's past performance is not a good predictor of the Fund's future performance. The graph does not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">Visit </span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">www.401k.com</span><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;"> for more recent performance information.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:italic;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The graph does not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.</span>
<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 April 30, 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></div>
<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:bold;"> <span> </span></span></div>
<div style="text-align:left;text-align-last:auto;"></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>15,607,510</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;">930</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;">Total Advisory Fee</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>0</div>
<div style="text-align:right;text-align-last:auto;"></div>
</td>
<td style="width:5%; " valign="middle"><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;">115<span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">%</span></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>
</table>
</div>
<div style="text-align:left;text-align-last:auto;"></div>
15607510
930
0
1.15
MARKET SECTORS
(% of Fund's net assets)
Financials
18.7
Health Care
16.7
Industrials
16.2
Information Technology
14.8
Consumer Discretionary
10.8
Energy
6.1
Real Estate
5.4
Materials
3.5
Communication Services
3.0
Consumer Staples
2.4
Utilities
2.1
Common Stocks
99.7
Short-Term Investments and Net Other Assets (Liabilities)
0.3
ASSET ALLOCATION (% of Fund's net assets)
Common Stocks - 99.7
Short-Term Investments and Net Other Assets (Liabilities) - 0.3
United States
98.4
Canada
0.2
Switzerland
0.2
Puerto Rico
0.2
Norway
0.2
Singapore
0.2
Japan
0.2
Ghana
0.1
Israel
0.1
Others
0.2
GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
United States - 98.4
Canada - 0.2
Switzerland - 0.2
Puerto Rico - 0.2
Norway - 0.2
Singapore - 0.2
Japan - 0.2
Ghana - 0.1
Israel - 0.1
Others - 0.2
0.187
0.167
0.162
0.148
0.108
0.061
0.054
0.035
0.030
0.024
0.021
0.997
0.003
0.984
0.002
0.002
0.002
0.002
0.002
0.002
0.001
0.001
0.002
TOP HOLDINGS(% of Fund's net assets)
Sanmina Corp
0.6
Applied Optoelectronics Inc
0.5
Axsome Therapeutics Inc
0.5
FirstCash Holdings Inc
0.5
Powell Industries Inc
0.5
Applied Digital Corp
0.4
Glaukos Corp
0.4
StoneX Group Inc
0.4
Hut 8 Corp (United States)
0.3
Terawulf Inc
0.3
4.4
0.006
0.005
0.005
0.005
0.005
0.004
0.004
0.004
0.003
0.003