Fund/Ticker
Fidelity® Long-Term Treasury Bond Index Fund/FNBGX
 
Summary Prospectus
April 29, 2024
 
Before you invest, you may want to review the fund's prospectus, which contains more information about the fund and its risks. You can find the fund's prospectus, reports to shareholders, and other information about the fund (including the fund's SAI) online at www.fidelity.com/funddocuments. You can also get this information at no cost by calling 1-800-FIDELITY or by sending an e-mail request to fidfunddocuments@fidelity.com. The fund's prospectus and SAI dated April 29, 2024 are incorporated herein by reference.
245 Summer Street, Boston, MA 02210
 
 
 
 
 
 
 
Fund Summary
Fund:
Fidelity® Long-Term Treasury Bond Index Fund
 
Investment Objective
 
Fidelity® Long-Term Treasury Bond Index Fund seeks a high level of current income.
Fee Table
The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. In addition to the fees and expenses described below, your broker may also require you to pay brokerage commissions on purchases and sales of the fund, which are not reflected in the table and example below.
 
 
Shareholder fees
(fees paid directly from your investment)
None
 
Annual Operating Expenses
(expenses that you pay each year as a % of the value of your investment)
Management fee
0.03%   
Distribution and/or Service (12b-1) fees
None   
Other expenses
0.00%   
Total annual operating expenses
0.03%   
This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
 
 
1 year
$
3
3 years
$
10
5 years
$
17
10 years
$
39
 
 
 
Portfolio Turnover
 
The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 17% of the average value of its portfolio.
Principal Investment Strategies
Principal Investment Risks
Interest rate increases can cause the price of a debt security to decrease.
The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.
The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole.
A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.
The performance of the fund and its underlying index may vary somewhat due to factors such as fees and expenses of the fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on the fund and its shareholders.
The fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the fund's performance could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.
Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate.
Performance
The following information is intended to help you understand the risks of investing in the fund.
The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.
Visit www.fidelity.com for more recent performance information.
 
Year-by-Year Returns*
 
 
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
 
25.43%
 
-1.52%
 
1.12%
 
8.59%
 
-1.63%
 
14.22%
 
17.81%
 
-4.86%
 
-29.42%
 
3.18%
 
During the periods shown in the chart:
Returns
Quarter ended
   Highest Quarter Return
22.24%
March 31, 2020
   Lowest Quarter Return
-13.40%
March 31, 2021
   Year-to-Date Return
-3.02%
March 31, 2024
 
* The initial offering of Fidelity® Long-Term Treasury Bond Index Fund (formerly named Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
 
Average Annual Returns*
 
After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
 
 
For the periods ended December 31, 2023
Past 1
year
Past 5
years
Past 10
years
Fidelity® Long-Term Treasury Bond Index Fund
  
  
  
Return Before Taxes 
3.18%
-1.39%
2.21%
Return After Taxes on Distributions 
1.83%
-2.54%
0.99%
Return After Taxes on Distributions and Sale of Fund Shares 
 
1.86%
-1.37%
1.27%
Bloomberg U.S. Long Treasury Bond Index
(reflects no deduction for fees, expenses, or taxes)
  
3.06%
  
-1.24%
  
2.28%
 
  
  
  
 
* The initial offering of Fidelity® Long-Term Treasury Bond Index Fund (formerly named Institutional Premium Class) took place on October 4, 2017. Returns prior to October 4, 2017 are those of the former Premium Class and have not been restated to reflect current fees.
 
Investment Adviser
Fidelity Management & Research Company LLC (FMR) (the Adviser) is the fund's manager. Other investment advisers serve as sub-advisers for the fund.
Portfolio Manager(s)
Brandon Bettencourt (Co-Portfolio Manager) has managed the fund since 2014.
Richard Munclinger (Co-Portfolio Manager) has managed the fund since 2020.
Purchase and Sale of Shares
You may buy or sell shares through a Fidelity® brokerage or mutual fund account, through a retirement account, or through an investment professional.
You may buy or sell shares in various ways:
Internet
www.fidelity.com
Phone
Fidelity Automated Service Telephone (FAST®) 1-800-544-5555
To reach a Fidelity representative 1-800-544-6666
Mail
Additional purchases:
Fidelity Investments
P.O. Box 770001
Cincinnati, OH 45277-0003
Redemptions:
Fidelity Investments
P.O. Box 770001
Cincinnati, OH 45277-0035
TDD - Service for the Deaf and Hearing Impaired
1-800-544-0118
The price to buy one share is its net asset value per share (NAV). Shares will be bought at the NAV next calculated after an order is received in proper form.
The price to sell one share is its NAV. Shares will be sold at the NAV next calculated after an order is received in proper form.
The fund is open for business each day the New York Stock Exchange (NYSE) is open.
There is no purchase minimum for fund shares.
Tax Information
Distributions you receive from the fund are subject to federal income tax and generally will be taxed as ordinary income or capital gains, and may also be subject to state or local taxes, unless you are investing through a tax-advantaged retirement account (in which case you may be taxed later, upon withdrawal of your investment from such account).
Payments to Broker-Dealers and Other Financial Intermediaries
The fund, the Adviser, Fidelity Distributors Company LLC (FDC), and/or their affiliates may pay intermediaries, which may include banks, broker-dealers, retirement plan sponsors, administrators, or service-providers (who may be affiliated with the Adviser or FDC), for the sale of fund shares and related services. These payments may create a conflict of interest by influencing your intermediary and your investment professional to recommend the fund over another investment. Ask your investment professional or visit your intermediary's web site for more information.
 
Current regulations allow Fidelity to send a single copy of shareholder documents for Fidelity® funds, such as prospectuses, annual and semi-annual reports, and proxy materials, to certain mutual fund customers whom we believe are members of the same family who share the same address. For certain types of accounts, we will not send multiple copies of these documents to you and members of your family who share the same address. Instead, we will send only a single copy of these documents. This will continue for as long as you are a shareholder, unless you notify us otherwise. If at any time you choose to receive individual copies of any documents, please call 1-800-544-8544. We will begin sending individual copies to you within 30 days of receiving your call.
Fidelity Distributors Company LLC (FDC) is a member of the Securities Investor Protection Corporation (SIPC). You may obtain information about SIPC, including the SIPC brochure, by visiting www.sipc.org or calling SIPC at 202-371-8300.
Fidelity, the Fidelity Investments Logo and all other Fidelity trademarks or service marks used herein are trademarks or service marks of FMR LLC. Any third-party marks that are used herein are trademarks or service marks of their respective owners. © 2024 FMR LLC. All rights reserved.
1.9885083.108
LBX-I-SUM-0424