Fidelity Flex® Funds

Fund/Ticker

Fidelity Flex® Conservative Income Bond Fund/FJTDX

Summary Prospectus

October 30, 2023

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/workplacedocuments. You can also get this information at no cost by calling 1-800-835-5095 or by sending an e-mail request to fidfunddocuments@fidelity.com. The fund's prospectus and SAI dated October 30, 2023 are incorporated herein by reference.

245 Summer Street, Boston, MA 02210

Fund Summary

Fund:

Fidelity Flex® Conservative Income Bond Fund

Investment Objective

Fidelity Flex® Conservative Income Bond Fund seeks to obtain a high level of current income consistent with preservation of capital.

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.

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	0.00%
Distribution and/or Service (12b-1) fees	None
Other expenses	0.02%
Total annual operating expenses	0.02% A
Fee waiver and/or expense reimbursement	0.02% B
Total annual operating expenses after fee waiver and/or expense reimbursement	0.00%

AThe fund is available only to certain fee-based accounts and advisory programs offered by Fidelity. Advisory account clients, retirement plans, plan sponsors and/or plan participants typically pay an advisory fee that generally covers investment advisory and administrative services.

BFidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent proxy and shareholder meeting expenses exceed 0.003% of the fund's average net assets. This arrangement will remain in effect through December 31, 2024. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.

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. This example does not include any fees paid at the fee-based account or plan level. 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	$	0
3 years	$	4
5 years	$	9
10 years	$	23

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 55% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing at least 80% of assets in U.S. dollar-denominated money market and high quality investment-grade debt securities of all types, and repurchase agreements for those securities.
• Potentially entering into reverse repurchase agreements.
• Investing up to 5% of assets in lower quality investment-grade securities.
• Managing the fund to have similar overall interest rate risk to the Bloomberg U.S. 3-6 Month Treasury Bill Index.
• Normally maintaining a dollar-weighted average maturity of 0.75 years or less.
• Normally investing in fixed rate securities with a maximum maturity of two years or less and floating rate securities with a maximum maturity of three years or less.
• Allocating assets across different market sectors and maturities.
• Investing more than 25% of total assets in the financial services industries.
• Investing in domestic and foreign issuers.
• Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.

Principal Investment Risks

• Interest Rate Changes.

Interest rate increases can cause the price of a debt or money market security to decrease.

• Foreign Exposure.

Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Financial Services Concentration.

Changes in government regulation and interest rates and economic downturns can have a significant negative effect on issuers in the financial services sector, including the price of their securities or their ability to meet their payment obligations.

• Prepayment.

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.

• Issuer-Specific Changes.

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.

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.

The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level.

Visit www.401k.com and log in or www.fidelity.com for more recent performance information.

Year-by-Year Returns

2019	2020	2021	2022
3.20%	1.35%	0.25%	1.47%

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	1.75%	June 30, 2020
Lowest Quarter Return	-0.79%	March 31, 2020
Year-to-Date Return	4.07%	September 30, 2023

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, 2022	Past 1 year	Life of fundA
Fidelity Flex® Conservative Income Bond Fund
Return Before Taxes	1.47%	1.62%
Return After Taxes on Distributions	0.70%	0.93%
Return After Taxes on Distributions and Sale of Fund Shares	0.86%	0.94%
Bloomberg U.S. 3-6 Month Treasury Bill Index (reflects no deduction for fees, expenses, or taxes)	1.31%	1.29%

AFrom May 31, 2018.

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)

Rob Galusza (Co-Portfolio Manager) has managed the fund since 2018.

Julian Potenza (Co-Portfolio Manager) has managed the fund since 2018.

Maura Walsh (Co-Portfolio Manager) has managed the fund since 2018.

David DeBiase (Co-Portfolio Manager) has managed the fund since 2020.

Purchase and Sale of Shares

Shares are available only to certain fee-based accounts and advisory programs offered by Fidelity. Shares also may be available to certain broker-dealers that have entered into arrangements with Fidelity.

You may buy or sell shares in various ways:

Internet

Plan Accounts:	All Other Accounts:
www.401k.com	www.fidelity.com

Phone

Plan Accounts:

For Individual Accounts (investing through a retirement plan sponsor or other institution), refer to your plan materials or contact that institution directly.

For Retirement Plan Level Accounts:

Corporate Clients 1-800-962-1375

"Not for Profit" Clients 1-800-343-0860

All Other Accounts:

1-800-544-3455

Mail (Plan Accounts Only)

Redemptions: Fidelity Investments P.O. Box 770001 Cincinnati, OH 45277-0035 Overnight Express: Fidelity Investments 100 Crosby Parkway Covington, KY 41015

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 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. Currently, the Board of Trustees of the fund has not authorized such payments for shares of the fund. Ask your investment professional or visit your intermediary's web site for more information.

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. © 2023 FMR LLC. All rights reserved.

1.9887606.106 ZCI-SUM-1023