# EDGAR Filing Document

**Accession Number:** 0000035315
**File Stem:** 0000823535-23-000031
**Filing Date:** 2023-3
**Character Count:** 207419
**Document Hash:** 7ae86e93eaf4040f67ff51d503ced0ba
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000823535-23-000031.hdr.sgml**: 20230331

**ACCESSION NUMBER**: 0000823535-23-000031

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 34

**FILED AS OF DATE**: 20230331

**DATE AS OF CHANGE**: 20230331

**EFFECTIVENESS DATE**: 20230331

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIDELITY SALEM STREET TRUST
- **CENTRAL INDEX KEY:** 0000035315
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-41839
- **FILM NUMBER:** 23785139

**BUSINESS ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 617-563-7000

**MAIL ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY FIXED INCOME TRUST
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY FLEXIBLE BOND FUND
- **DATE OF NAME CHANGE:** 19860904

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY CORPORATE BOND FUND INC
- **DATE OF NAME CHANGE:** 19851225

## Series and Classes Contracts Data

### Fidelity Short-Term Bond Fund (Series ID: S000007007)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                     | Ticker Symbol | Class ID   |
| Fidelity Short-Term Bond Fund                  | FSHBX         | C000019128 |
| Fidelity Advisor Short-Term Bond Fund: Class A | FBNAX         | C000171437 |
| Fidelity Advisor Short-Term Bond Fund: Class M | FBNTX         | C000171438 |
| Fidelity Advisor Short-Term Bond Fund: Class C | FANCX         | C000171439 |
| Fidelity Advisor Short-Term Bond Fund: Class I | FBNIX         | C000171440 |
| Fidelity Advisor Short-Term Bond Fund: Class Z | FIKTX         | C000205020 |

---

### Fidelity Sustainable Low Duration Bond Fund (Series ID: S000075894)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                                   | Ticker Symbol | Class ID   |
| Fidelity Advisor Sustainable Low Duration Bond Fund: Class A | FAMZX         | C000235229 |
| Fidelity Advisor Sustainable Low Duration Bond Fund: Class M | FAPBX         | C000235230 |
| Fidelity Advisor Sustainable Low Duration Bond Fund: Class C | FANDX         | C000235231 |
| Fidelity Advisor Sustainable Low Duration Bond Fund: Class I | FAPDX         | C000235232 |
| Fidelity Advisor Sustainable Low Duration Bond Fund: Class Z | FAPEX         | C000235233 |
| Fidelity Sustainable Low Duration Bond Fund                  | FAPGX         | C000235234 |

---

## Series and Classes Contracts Data

### Fidelity Short-Term Bond Fund (Series ID: S000007007)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000019128 | Fidelity Short-Term Bond Fund                  | FSHBX           |
| C000171437 | Fidelity Advisor Short-Term Bond Fund: Class A | FBNAX           |
| C000171438 | Fidelity Advisor Short-Term Bond Fund: Class M | FBNTX           |
| C000171439 | Fidelity Advisor Short-Term Bond Fund: Class C | FANCX           |
| C000171440 | Fidelity Advisor Short-Term Bond Fund: Class I | FBNIX           |
| C000205020 | Fidelity Advisor Short-Term Bond Fund: Class Z | FIKTX           |

### Fidelity Sustainable Low Duration Bond Fund (Series ID: S000075894)

| Class ID   | Class Name                                                   | Ticker Symbol   |
|:---|:---|:---|
| C000235229 | Fidelity Advisor Sustainable Low Duration Bond Fund: Class A | FAMZX           |
| C000235230 | Fidelity Advisor Sustainable Low Duration Bond Fund: Class M | FAPBX           |
| C000235231 | Fidelity Advisor Sustainable Low Duration Bond Fund: Class C | FANDX           |
| C000235232 | Fidelity Advisor Sustainable Low Duration Bond Fund: Class I | FAPDX           |
| C000235233 | Fidelity Advisor Sustainable Low Duration Bond Fund: Class Z | FAPEX           |
| C000235234 | Fidelity Sustainable Low Duration Bond Fund                  | FAPGX           |

?xml version="1.0" encoding="UTF-8" standalone="no"? Prospectus - Investment Objective

**Supplement to the Fidelity® Short-Term Bond Fund October 29, 2022 Prospectus**

Effective April 1, 2023, the Adviser reduced and replaced the fund's management fee, which consisted of a group fee component plus an individual fee rate, with a flat rate. The following information replaces similar information found in the "Fund Summary" section under the "Fee Table" heading.

**Annual Operating Expenses**

**(expenses that you pay each year as a % of the value of your investment)**

---

| | |
|:---|:---|
| Management fee <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  |
| Distribution and/or Service (12b-1) fees  |  |
| Other expenses <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.10 %  |
| **Total annual operating expenses**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.30 %  |

---

<sup>A</sup> Adjusted to reflect current fees.

---

| | |
|:---|:---|
| 1 year  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 31  |
| 3 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 97  |
| 5 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 169  |
| 10 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 381  |

---

The following information replaces similar information found in the "Fund Services" section under the "Advisory Fee(s)" heading.

The fund pays a management fee to the Adviser.

The management fee is calculated and paid to the Adviser every month.

The annual management fee rate, as a percentage of the fund's average net assets, is shown in the following table:

---

| | |
|:---|:---|
| **Fund**  | **Management Fee Rate**  |
| Fidelity® Short-Term Bond Fund  | 0.20%  |

---

STP-PSTK-0423-115 1.790645.115 April 1, 2023

**Supplement to the Fidelity® Short-Term Bond Fund Class A, Class M, Class C, Class I, and Class Z October 29, 2022 Prospectus**

Effective April 1, 2023, the Adviser reduced and replaced the fund's management fee, which consisted of a group fee component plus an individual fee rate, with a flat rate. The following information replaces similar information found in the "Fund Summary" section under the "Fee Table" heading.

**Annual Operating Expenses**

**(expenses that you pay each year as a % of the value of your investment)**

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | **Class A**  | **Class M**  | **Class C**  | **Class I**  | **Class Z**  |
| Management fee <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  |
| Distribution and/or Service (12b-1) fees  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.15 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.15 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.00 %  |  |  |
| Other expenses <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.15 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.15 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.16 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.15 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.05 %  |
| **Total annual operating expenses**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.50 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.50 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.36 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.35 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.25 %  |
| Fee waiver and/or expense reimbursement  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.05 % <sup>B</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 %  |
| **Total annual operating expenses after fee waiver and/or expense reimbursement**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.50 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.50 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.36 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.30 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.25 %  |

---

<sup>A</sup> Adjusted to reflect current fees.

<sup>B</sup> Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Class I of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of their respective average net assets, exceed 0.30% (the Expense Cap). If at any time during the current fiscal year expenses for Class I of the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. 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.

---

| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **Class A**  | **Class A**  | **Class M**  | **Class M**  | **Class C**  | **Class C**  | **Class I**  | **Class I**  | **Class Z**  | **Class Z**  |
|  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  |
| 1 year  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 200  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 200  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 325  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 325  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 238  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 138  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 31  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 31  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 26  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 26  |
| 3 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 308  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 308  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 431  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 431  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 431  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 431  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 103  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 103  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 80  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 80  |
| 5 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 425  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 425  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 547  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 547  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 745  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 745  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 188  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 188  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 141  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 141  |
| 10 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 769  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 769  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 886  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 886  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1399  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1399  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 434  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 434  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 318  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 318  |

---

The following information replaces similar information found in the "Fund Services" section under the "Advisory Fee(s)" heading.

The fund pays a management fee to the Adviser.

The management fee is calculated and paid to the Adviser every month.

The annual management fee rate, as a percentage of the fund's average net assets, is shown in the following table:

---

| | |
|:---|:---|
| **Fund**  | **Management Fee Rate**  |
| Fidelity® Short-Term Bond Fund  | 0.20%  |

---

ASTP-PSTK-0423-109 1.9881435.109 April 1, 2023

**Supplement to the Fidelity® Sustainable Low Duration Bond Fund October 29, 2022 Prospectus**

Effective April 1, 2023, FMR reduced the fund's management fee. The following information replaces similar information found in the "Fund Summary" section under the "Fee Table" heading.

**Annual Operating Expenses**

**(expenses that you pay each year as a % of the value of your investment)**

---

| | |
|:---|:---|
| Management fee <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  |
| Distribution and/or Service (12b-1) fees  |  |
| Other expenses <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.09 %  |
| **Total annual operating expenses**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.29 %  |
| Fee waiver and/or expense reimbursement <sup>B</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.04 %  |
| **Total annual operating expenses after fee waiver and/or expense reimbursement**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.25 %  |

---

<sup>A</sup> Adjusted to reflect current fees.

<sup>B</sup> Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.25% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. 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.

---

| | |
|:---|:---|
| 1 year  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 26  |
| 3 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86  |

---

The following information replaces similar information found in the "Fund Services" section under the "Advisory Fee(s)" heading.

The annual management fee rate, as a percentage of the fund's average net assets, is shown in the following table:

---

| | |
|:---|:---|
| **Fund**  | **Management Fee Rate**  |
| Fidelity® Sustainable Low Duration Bond Fund  | 0.20%  |

---

SLD-PSTK-0423-100 1.9909567.100 April 1, 2023

**Fidelity® Sustainable Low Duration Bond Fund**

**<u>Class</u>** <u>/Ticker</u>

**Fidelity Advisor® Sustainable Low Duration Bond Fund**

**A** /FAMZX **M** /FAPBX **C** /FANDX **I** /FAPDX **Z** /FAPEX

**Prospectus**

**October 29, 2022**

**As Revised April 1, 2023**

---

| | |
|:---|:---|
| Like securities of all mutual funds, these securities have not been approved or disapproved by the Securities and Exchange Commission, and the Securities and Exchange Commission has not determined if this prospectus is accurate or complete. Any representation to the contrary is a criminal offense. <br>| ![](img90432_1.jpg) <br> 245 Summer Street, Boston, MA 02210  |

---

**Contents**

---

| | |
|:---|:---|
| **Fund Summary** | [Fidelity® Sustainable Low Duration Bond Fund](#SubSec_FundSummary_ASLD-PRO_FundName6526) |
| **Fund Basics** | **[Investment Details](#SubSec_FundBasics_InvestmentDetails_ASLD-PRO)** |
|  | **[Valuing Shares](#SubSec_FundBasics_ValuingShares_ASLD-PRO)** |
| **Shareholder Information** | **[Additional Information about the Purchase and Sale of Shares](#SubSec_ShareholderInformation_AdditionalInformation_ASLD-PRO)** |
|  | **[Converting Shares](#SubSec_ShareholderInformation_ConvertingShares_ASLD-PRO)** |
|  | **[Exchanging Shares](#SubSec_ShareholderInformation_ExchangingShares_ASLD-PRO)** |
|  | **[Rollover IRAs](#SubSec_ShareholderInformation_RolloverIRAs_ASLD-PRO)** |
|  | **[Account Features and Policies](#SubSec_ShareholderInformation_AccountFeatures_ASLD-PRO)** |
|  | **[Dividends and Capital Gain Distributions](#SubSec_ShareholderInformation_Dividendsand_ASLD-PRO)** |
|  | **[Tax Consequences](#SubSec_ShareholderInformation_TaxConsequences_ASLD-PRO)** |
| **Fund Services** | **[Fund Management](#SubSec_FundServices_FundManagement_ASLD-PRO)** |
|  | **[Fund Distribution](#SubSec_FundServices_FundDistribution_ASLD-PRO)** |
| **Appendix** | **[Financial Highlights](#SubSec_Appendix_FinancialHighlights_ASLD-PRO)** |
|  | **[Additional Index Information](#SubSec_Appendix_AdditionalIndex_ASLD-PRO)** |
|  | **[Sales Charge Waiver Policies Applied by Certain Intermediaries](#SubSec_Appendix_SalesCharge_ASLD-PRO)** |

---

**Fund Summary**

Fund **/Class:**

Fidelity® Sustainable Low Duration Bond Fund **/Fidelity Advisor® Sustainable Low Duration Bond Fund A, M, C, I, Z** 

**Investment Objective**

Fidelity® Sustainable Low Duration 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 and hold 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 certain share classes of the fund.**

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $250,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 36 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see "Sales Charge Waiver Policies Applied by Certain Intermediaries" in the "Appendix" section of the prospectus.

**Shareholder fees**

**(fees paid directly from your investment)**

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | **Class A**  | **Class M**  | **Class C**  | **Class I**  | **Class Z**  |
| Maximum sales charge (load) on purchases (as a % of offering price)  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.50 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.50 %  |  |  |  |
| Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption <br> proceeds)  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; None <sup>A</sup> <br>| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; None <sup>B</sup> <br>| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.00 % <sup>C</sup> <br>|  |  |

---

<sup>A</sup> Purchases of $250,000 or more will not be subject to a front-end sales charge, but may be subject to a 0.50% contingent deferred sales charge (CDSC) if the intermediary firm has elected an upfront finder's fee at the time the shares are purchased, or a 0.75% CDSC if the shares purchased are recordkept in a Fidelity Advisor® 401(k) Retirement Plan.

<sup>B</sup> Purchases of $250,000 or more will not be subject to a front-end sales charge but may be subject to a 0.25% CDSC if a finder's fee is paid at the time the shares are purchased.

<sup>C</sup> On Class C shares redeemed less than one year after purchase.

**Annual Operating Expenses**

**(expenses that you pay each year as a % of the value of your investment)**

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | **Class A**  | **Class M**  | **Class C**  | **Class I**  | **Class Z**  |
| Management fee <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  |
| Distribution and/or Service (12b-1) fees  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.15 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.15 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.00 %  |  |  |
| Other expenses <sup>A</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.06 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.06 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.06 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.07 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.05 %  |
| **Total annual operating expenses**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.41 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.41 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.26 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.27 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.25 %  |
| Fee waiver and/or expense reimbursement <sup>B</sup>  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.00 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.02 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.05 %  |
| **Total annual operating expenses after fee waiver and/or expense reimbursement**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.41 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.41 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.26 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.25 %  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.20 %  |

---

<sup>A</sup> Adjusted to reflect current fees.

<sup>B</sup> Fidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse Class I and Class Z of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of their respective average net assets, exceed 0.25% and 0.20% (the Expense Caps). If at any time during the current fiscal year expenses for Class I or Class Z of the fund fall below the Expense Caps, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Caps. These arrangements will remain in effect through December 31, 2024 . FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees and may extend them 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. 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 and if you hold your shares:

---

| | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **Class A**  | **Class A**  | **Class M**  | **Class M**  | **Class C**  | **Class C**  | **Class I**  | **Class I**  | **Class Z**  | **Class Z**  |
|  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  | Sell All <br> Shares  | Hold <br> Shares  |
| 1 year  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 191  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 191  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 191  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 191  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 128  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 228  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 26  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 26  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 20  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 20  |
| 3 years  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 280  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 280  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 280  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 280  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 400  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 400  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 83  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 83  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 71  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 71  |

---

**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. For the period from April 13, 2022 to August 31, 2022, the fund's portfolio turnover rate was 5 % of the average value of its portfolio.

**Principal Investment Strategies**

* Normally investing at least 80% of assets in investment-grade debt securities (those of medium and high quality) of all types that Fidelity Management & Research Company LLC (FMR) (the Adviser) believes have positive environmental, social and governance (ESG) benefits and repurchase agreements for those securities.

* Evaluating each security in which the fund invests using both a traditional bond credit, structure and relative value analysis and a consideration of the Adviser's judgment about the security's ESG benefits. When assessing a security's ESG benefits and its eligibility for purchase, the Adviser considers the following, where available: (i) the sustainability practices of the security's issuer or sponsor, as applicable (each, an "issuer"), based on an evaluation of such issuer's individual ESG profile; (ii) ESG factors related to the security's underlying pool of assets; and (iii) any third-party designation as a green, sustainable or sustainability-linked bond. A security's positive ESG benefits can be determined under any of those three factors. 

* Using the Adviser's proprietary ESG ratings process to evaluate the current state of an issuer's sustainability practices using a data-driven framework that includes both proprietary and third-party data, and also provide a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. 

* The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers. Issuers with an above average ESG rating as determined by the Adviser are considered to have positive ESG benefits and well-managed ESG risks. 

* Investing in debt securities of issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact. 

* When evaluating securitized debt securities (including mortgage-backed securities, commercial mortgage-backed securities, and other asset-backed securities), generally considering the issuer's ESG rating along with ESG factors related to the underlying pool of assets, such as energy efficiency and environmental impact of the underlying assets; providing access to affordable housing or opportunities for first time home ownership; and compliance with fair lending laws. 

* In addition to its focus on debt securities with a positive ESG benefit, analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.

* Normally maintaining a duration of 1 year or less.

* Managing the fund to have similar overall interest rate risk to the Bloomberg US Treasury Bill: 6-9 Months Index.

* Normally maintaining a dollar-weighted average maturity of two 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.

* Engaging in transactions that have a leveraging effect on the fund, including investments in derivatives - such as swaps (interest rate, total return, and credit default), options, and futures contracts - and forward-settling securities, to adjust the fund's risk exposure.

* Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.

**Principal Investment Risks**

* *Interest Rate Changes.*

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

* *Sustainability Risk.*

Application of FMR's ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices.

* *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.

* *Leverage Risk.*

Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.

*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**

Performance history will be available for the fund after the fund has been in operation for one calendar year.

**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)**

David DeBiase (Co-Portfolio Manager) has managed the fund since 2022.

Rob Galusza (Co-Portfolio Manager) has managed the fund since 2022.

Julian Potenza (Co-Portfolio Manager) has managed the fund since 2022.

**Purchase and Sale of Shares**

You may buy or sell shares through a retirement account or through an investment professional.

You may buy or sell shares in various ways:

**Internet**

**institutional.fidelity.com**

**Phone**

**To reach a Fidelity representative 1-877-208-0098**

**Mail**

---

| | |
|:---|:---|
| <br> **Fidelity Investments** <br> **P.O. Box 770002** <br> **Cincinnati, OH 45277-0081**  | ***Overnight Express:*** <br> **Fidelity Investments** <br> **100 Crosby Parkway** <br> **Covington, KY 41015**  |

---

Class I and Class Z eligibility requirements are listed in the "Additional Information about the Purchase and Sale of Shares" section of the prospectus.

The price to buy one share of Class A or Class M is its offering price, if you pay a front-end sales charge, or its net asset value per share (NAV), if you qualify for a front-end sales charge waiver.

The price to buy one share of Class C, Class I, or Class Z is its NAV.

Shares will be bought at the offering price or NAV, as applicable, next calculated after an order is received in proper form.

The price to sell one share of Class A, Class M, or Class C is its NAV, minus any applicable contingent deferred sales charge (CDSC).

The price to sell one share of Class I or Class Z is its NAV.

Shares will be sold at the NAV next calculated after an order is received in proper form, minus any applicable CDSC.

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.

**Fund Basics**

**Investment Details**

***Investment Objective***

Fidelity® Sustainable Low Duration Bond Fund seeks to obtain a high level of current income consistent with preservation of capital.

***Principal Investment Strategies***

The Adviser normally invests at least 80% of the fund's assets in investment-grade debt securities (those of medium and high quality) of all types that the Adviser believes have positive ESG benefits and repurchase agreements for those securities.

The Adviser evaluates each security in which the fund invests using both a traditional bond credit, structure and relative value analysis and a consideration of the Adviser's judgment about the security's ESG benefits. When assessing a security's ESG benefits and its eligibility for purchase, the Adviser considers the following, where available: (i) the sustainability practices of the security's issuer or sponsor, as applicable (each, an "issuer"), based on an evaluation of such issuer's individual ESG profile; (ii) ESG factors related to the security's underlying pool of assets; and (iii) any third-party designation as a green, sustainable or sustainability-linked bond. A security's positive ESG benefits can be determined under any of those three factors.

The Adviser's proprietary ESG ratings process is designed to evaluate an issuer's current and future ESG positioning relative to its peers. The process has two components. One component evaluates the current state of an issuer's sustainability practices using a data-driven framework that includes proprietary and third-party (such as CDP, Institutional Shareholder Services, and MSCI) data. The other component involves a qualitative forward-looking assessment of an issuer's sustainability outlook provided by the Adviser's fundamental research analysts and ESG team. This qualitative assessment is based on criteria including, but not limited to, the issuer's public sustainability disclosure, the issuer's systems and policies regarding sustainability, and issuer engagement on sustainability issues and opportunities.

The Adviser's ESG ratings of issuers are derived from multiple factors, including an issuer's environmental profile, which may include, but is not limited to, carbon and toxic emissions, water management, waste management, vulnerability to the physical impacts of climate change, and research and investment into products, services, and energies that reduce emissions and/or provide opportunities to transition to less carbon-intensive products or operations. An assessment of an issuer's social profile includes, but is not limited to, its approach to diversity and inclusion, human capital management, data privacy, product safety and human rights. With respect to governance, the independence and diversity of an issuer's board, its compensation practices and board oversight of critical ESG issues are considered as part of the assessment. These factors are weighted based on how material the Adviser believes each factor is to an issuer's financial outlook, and not all factors may be applicable to all issuers. Based on this process, the Adviser will assign ratings for an issuer's overall ESG performance. Issuers with an above average ESG rating as determined by the Adviser are considered to have positive ESG benefits and well-managed ESG risks.

The fund may also invest in debt securities of issuers that the Adviser believes deliver tangible environmental or social impact through core business operations. An assessment of the impact characteristics of an issuer may involve corporate engagement and an analysis of issuer alignment with the United Nations Sustainable Development Goals using qualitative analysis as well as proprietary or third-party data. For example, issuers that provide access to clean water, education, or clean energy through their core business may be considered to deliver tangible impact.

When evaluating securitized debt securities (including mortgage-backed securities, commercial mortgage-backed securities, and other asset-backed securities), the Adviser generally considers the issuer's ESG rating along with ESG factors related to the underlying pool of assets, such as energy efficiency and environmental impact of the underlying assets; providing access to affordable housing or opportunities for first time home ownership; and compliance with fair lending laws.

In addition to its focus on debt securities with a positive ESG benefit, the Adviser considers other factors when selecting the fund's investments, including the credit quality of the issuer, security-specific features, current valuation relative to alternatives in the market, short-term trading opportunities resulting from market inefficiencies, and potential future valuation. In managing the fund's exposure to various risks, including interest rate risk, the Adviser considers, among other things, the market's overall risk characteristics, the market's current pricing of those risks, information on the fund's competitive universe and internal views of potential future market conditions.

The fund normally maintains a duration of 1 year or less. Duration is a measure of a bond's price sensitivity to a change in interest rates. For example, if a bond has a 1-year duration and interest rates rise 1%, the bond's value is likely to fall about 1%. Similarly, if a bond fund has a 1-year duration and interest rates rise 1%, the fund's value is likely to fall about 1%.

The Adviser uses the Bloomberg US Treasury Bill: 6-9 Months Index as a guide in structuring the fund and selecting its investments. The Adviser manages the fund to have similar overall interest rate risk to the index.

In addition, the fund normally maintains a dollar-weighted average maturity of two years or less. In determining a security's maturity for purposes of calculating the fund's average maturity, an estimate of the average time for its principal to be paid may be used. This can be substantially shorter than its stated maturity.

The Adviser allocates the fund's assets among different market sectors (for example, corporate, asset-backed, or government securities) and different maturities based on its view of the relative value of each sector or maturity.

The Adviser will invest more than 25% of the fund's total assets in the financial services industries.

The Adviser may invest the fund's assets in securities of foreign issuers in addition to securities of domestic issuers.

The Adviser may engage in transactions that have a leveraging effect on the fund, including investments in derivatives, regardless of whether the fund may own the asset, instrument, or components of the index underlying the derivative, and forward-settling securities. The Adviser may invest a significant portion of the fund's assets in these types of investments. If the fund invests a significant portion of its assets in derivatives, its investment exposure could far exceed the value of its portfolio securities and its investment performance could be primarily dependent upon securities it does not own. The fund's derivative investments may include interest rate swaps, total return swaps, credit default swaps, options (including options on futures and swaps), and futures contracts (both long and short positions) on securities, other instruments, and indexes. Depending on the Adviser's outlook and market conditions, the Adviser may engage in these transactions to increase or decrease the fund's exposure to changing security prices, interest rates, credit qualities, or other factors that affect security values, or to gain or reduce exposure to an asset, instrument, or index.

If the Adviser's strategies do not work as intended, the fund may not achieve its objective.

Shareholders should be aware that investments made by the fund and results achieved by the fund at any given time are not expected to be the same as those made by other funds for which the Adviser or an affiliate acts as manager, including funds with names, investment objectives, and policies that are similar to the fund.

***Description of Principal Security Types***

*Debt securities* are used by issuers to borrow money. The issuer usually pays a fixed, variable, or floating rate of interest, and must repay the amount borrowed, usually at the maturity of the security. Some debt securities, such as zero coupon bonds, do not pay current interest but are sold at a discount from their face values. Debt securities include corporate bonds, government securities (including Treasury securities), repurchase agreements, money market securities, mortgage and other asset-backed securities (including collateralized loan obligations), loans and loan participations, and other securities believed to have debt-like characteristics, including hybrids and synthetic securities.

*A repurchase agreement* is an agreement to buy a security at one price and a simultaneous agreement to sell it back at an agreed-upon price.

*Derivatives* are investments whose values are tied to an underlying asset, instrument, currency, or index. Derivatives include futures, options, forwards, and swaps, such as interest rate swaps (exchanging a floating rate for a fixed rate), total return swaps (exchanging a floating rate for the total return of an index, security, or other instrument or investment) and credit default swaps (buying or selling credit default protection).

*Forward-settling securities* involve a commitment to purchase or sell specific securities when issued, or at a predetermined price or yield. When a fund does not already own or have the right to obtain securities equivalent in kind and amount, a commitment to sell securities is equivalent to a short sale. Payment and delivery take place after the customary settlement period.

**Sustainable Investing Exclusions**

As part of its investment approach, the fund also applies broad criteria ("exclusion criteria") that seek to exclude issuers that are directly engaged in, and/or derive significant revenue from, certain industries or product lines. At present, these include: civilian semi-automatic firearms; tobacco production, or bonds issued against the proceeds of tobacco settlements; for-profit prisons; controversial weapons (e.g., cluster munitions, land mines, biological/chemical weapons, blinding lasers, and incendiary weapons); and coal production and/or mining.

In determining whether an issuer is directly engaged in, and/or derives significant revenue from a particular industry or product line, the fund may use revenue thresholds (e.g., issuers that derive more than 5% of revenue from tobacco production) and/or categorical exclusions (e.g., issuers that derive any revenue from the operation of private prisons or issuers that are classified within the coal production or mining industries), depending on the industry or product line, based generally on data provided by one or more third-party vendor(s). The Adviser, in its sole discretion, retains the right not to use data provided by third-party vendors where it deems the data not representative of an issuer's current business operations. In such cases, or where data on specific issuers may not be available from third-party vendors, the Adviser may make reasonable estimates or otherwise exercise its discretion.

The fund's exclusion criteria may be updated periodically to, among other things, add or remove certain industries or product lines from the screening process, revise the revenue thresholds and categorical exclusions applicable to such activities, or change particular industries or product lines from a categorical exclusion to a revenue threshold, or vice versa. Once the Adviser determines that an issuer is not subject to the fund's exclusion criteria, the Adviser then employs the sustainability strategy discussed above.

The implementation of the sustainability strategy (or strategies) is conducted alongside traditional fundamental, bottom-up financial analysis of individual issuers, using traditional fundamental metrics and/or traditional quantitative metrics. The Adviser may also engage in dialogues with the issuer's management teams to further inform investment decision-making and to foster best corporate governance practices using its fundamental and sustainability analysis. In addition, the fund may invest in an issuer prior to completion of the sustainability analysis or without engaging with the issuer's management.

***Principal Investment Risks***

Many factors affect the fund's performance. Developments that disrupt global economies and financial markets, such as pandemics and epidemics, may magnify factors that affect a fund's performance. The fund's share price and yield change daily based on changes in market conditions and interest rates and in response to other economic, political, or financial developments. The fund's reaction to these developments will be affected by the types and maturities of securities in which the fund invests, the financial condition, industry and economic sector, and geographic location of an issuer, and the fund's level of investment in the securities of that issuer. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. When you sell your shares they may be worth more or less than what you paid for them, which means that you could lose money by investing in the fund.

The following factors can significantly affect the fund's performance:

*Sustainability Risk.* Application of FMR's ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. Socially responsible norms differ by country and region, and an issuer's ESG factors or the Adviser's assessment of such may change over time. A fund may invest in issuers that do not reflect the beliefs and values of any particular investor. When conducting the ESG ratings process of an issuer or compiling and maintaining the sustainable investing exclusion list, the Adviser may rely on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices with respect to ESG or to incorrectly include or exclude an issuer on or from its sustainable investing exclusion list. Certain investments may be dependent on U.S. and foreign government policies, including tax incentives and subsidies, which may change without notice. A fund's investments in certain issuers may be susceptible to various factors that may impact their businesses or operations, including costs associated with government budgetary constraints that impact publicly funded projects and initiatives, the effects of general economic conditions throughout the world, increased competition from other providers of services, unfavorable tax laws or accounting policies and high leverage.

*Interest Rate Changes.* Debt securities, including money market securities, have varying levels of sensitivity to changes in interest rates. In general, the price of a debt security can fall when interest rates rise and can rise when interest rates fall. Securities with longer maturities and certain types of securities, such as mortgage securities and the securities of issuers in the financial services sector, can be more sensitive to interest rate changes, meaning the longer the maturity of a security, the greater the impact a change in interest rates could have on the security's price. Short-term and long-term interest rates do not necessarily move in the same amount or the same direction. Short-term securities tend to react to changes in short-term interest rates, and long-term securities tend to react to changes in long-term interest rates. Securities with floating interest rates can be less sensitive to interest rate changes, but may decline in value if their interest rates do not rise as much as interest rates in general. Securities whose payment at maturity is based on the movement of all or part of an index and inflation-protected debt securities may react differently from other types of debt securities. In market environments where interest rates are rising, issuers may be less willing or able to make principal and/or interest payments on securities when due. The discontinuation and replacement of London Interbank Offered Rate (LIBOR) (an indicative measure of the average interest rate at which major global banks could borrow from one another) and other benchmark rates may have a significant impact on the financial markets and may adversely impact a fund's performance.

*Foreign Exposure.* Foreign securities and securities issued by U.S. entities with substantial foreign operations can involve additional risks relating to political, economic, or regulatory conditions in foreign countries. These risks include fluctuations in foreign exchange rates; withholding or other taxes; trading, settlement, custodial, and other operational risks; and the less stringent investor protection and disclosure standards of some foreign markets. All of these factors can make foreign investments more volatile and potentially less liquid than U.S. investments. In addition, foreign markets can perform differently from the U.S. market.

Global economies and financial markets are becoming increasingly interconnected, which increases the possibilities that conditions in one country or region might adversely impact issuers or providers in, or foreign exchange rates with, a different country or region.

*Financial Services Concentration.* Financial services companies are highly dependent on the supply of short-term financing and can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad. These events can significantly affect the price of issuers' securities as well as their ability to make payments of principal or interest or otherwise meet obligations on securities or instruments for which they serve as guarantors or counterparties.

*Prepayment.* Many types of debt securities, including mortgage securities, are subject to prepayment risk. Prepayment risk occurs when the issuer of a security can repay principal prior to the security's maturity. Securities subject to prepayment can offer less potential for gains during a declining interest rate environment and similar or greater potential for loss in a rising interest rate environment. In addition, the potential impact of prepayment features on the price of a debt security can be difficult to predict and result in greater volatility.

*Issuer-Specific Changes.* Changes in the financial condition of an issuer or counterparty, changes in specific economic or political conditions that affect a particular type of security or issuer, and changes in general economic or political conditions can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's credit quality or value. Entities providing credit support or a maturity-shortening structure also can be affected by these types of changes, and if the structure of a security fails to function as intended, the security could decline in value. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) tend to be more sensitive to these changes than higher-quality debt securities.

*Leverage Risk.* Derivatives, forward-settling securities, and short sale transactions involve leverage because they can provide investment exposure in an amount exceeding the initial investment. Leverage can magnify investment risks and cause losses to be realized more quickly. A small change in the underlying asset, instrument, or index can lead to a significant loss. Forward-settling securities and short sale transactions also involve the risk that a security will not be issued, delivered, available for purchase, or paid for when anticipated. An increase in the market price of securities sold short will result in a loss. Government legislation or regulation could affect the use of these transactions and could limit a fund's ability to pursue its investment strategies.

In response to market, economic, political, or other conditions, a fund may temporarily use a different investment strategy for defensive purposes. If the fund does so, different factors could affect its performance and the fund may not achieve its investment objective.

***Other Investment Strategies***

In addition to the principal investment strategies discussed above, the Adviser may invest in collateralized loan obligations.

**Shareholder Notice**

The following is subject to change only upon 60 days' prior notice to shareholders:

Fidelity® Sustainable Low Duration Bond Fund normally invests at least 80% of its assets in investment-grade debt securities (those of medium and high quality) of all types that the Adviser believes have positive ESG benefits and repurchase agreements for those securities.

**Valuing Shares**

The fund is open for business each day the NYSE is open.

The NAV is the value of a single share. Fidelity normally calculates NAV as of the close of business of the NYSE, normally 4:00 p.m. Eastern time. The fund's assets normally are valued as of this time for the purpose of computing NAV. Fidelity calculates NAV separately for each class of shares of a multiple class fund.

NAV is not calculated and the fund will not process purchase and redemption requests submitted on days when the fund is not open for business. The time at which shares are priced and until which purchase and redemption orders are accepted may be changed as permitted by the Securities and Exchange Commission (SEC).

To the extent that the fund's assets are traded in other markets on days when the fund is not open for business, the value of the fund's assets may be affected on those days. In addition, trading in some of the fund's assets may not occur on days when the fund is open for business.

NAV is calculated using the values of other open-end funds, if any, in which the fund invests (referred to as underlying funds). Shares of underlying funds are valued at their respective NAVs. Other assets are valued primarily on the basis of market quotations, official closing prices, or information furnished by a pricing service. Certain short-term securities are valued on the basis of amortized cost. If market quotations, official closing prices, or information furnished by a pricing service are not readily available or, in the Adviser's opinion, are deemed unreliable for a security, then that security will be fair valued in good faith by the Adviser in accordance with applicable fair value pricing policies. For example, if, in the Adviser's opinion, a security's value has been materially affected by events occurring before a fund's pricing time but after the close of the exchange or market on which the security is principally traded, then that security will be fair valued in good faith by the Adviser in accordance with applicable fair value pricing policies. Fair value pricing will be used for high yield debt securities when available pricing information is determined to be stale or for other reasons not to accurately reflect fair value.

Arbitrage opportunities may exist when trading in a portfolio security or securities is halted and does not resume before a fund calculates its NAV. These arbitrage opportunities may enable short-term traders to dilute the NAV of long-term investors. Securities trading in overseas markets present time zone arbitrage opportunities when events affecting portfolio security values occur after the close of the overseas markets but prior to the close of the U.S. market. Fair valuation of a fund's portfolio securities can serve to reduce arbitrage opportunities available to short-term traders, but there is no assurance that fair value pricing policies will prevent dilution of NAV by short-term traders.

Policies regarding excessive trading may not be effective to prevent short-term NAV arbitrage trading, particularly in regard to omnibus accounts.

Fair value pricing is based on subjective judgments and it is possible that the fair value of a security may differ materially from the value that would be realized if the security were sold.

**Shareholder Information**

**Additional Information about the Purchase and Sale of Shares**

As used in this prospectus, the term "shares" generally refers to the shares offered through this prospectus.

**General Information**

**Ways to Invest**

You may buy or sell shares through a retirement account or an investment professional. When you invest through a retirement account or an investment professional, the procedures for buying, selling, and exchanging shares and the account features, policies, and fees may differ. Additional fees may apply to your investment in shares, including a transaction fee if you buy or sell shares through a broker or other investment professional. Your broker may also require you to pay brokerage commissions on purchases and sales of certain share classes of the fund.

**Information on Placing Orders**

You should include the following information with any order:

* Your name

* Your account number

* Type of transaction requested

* Name(s) of fund(s) and class(es)

* Dollar amount or number of shares

Certain methods of contacting Fidelity may be unavailable or delayed (for example, during periods of unusual market activity). In addition, the level and type of service available may be restricted.

**Frequent Purchases and Redemptions**

The fund may reject for any reason, or cancel as permitted or required by law, any purchase or exchange, including transactions deemed to represent excessive trading, at any time.

Excessive trading of fund shares can harm shareholders in various ways, including reducing the returns to long-term shareholders by increasing costs to the fund (such as brokerage commissions or spreads paid to dealers who sell money market instruments), disrupting portfolio management strategies, and diluting the value of the shares in cases in which fluctuations in markets are not fully priced into the fund's NAV.

The fund reserves the right at any time to restrict purchases or exchanges or impose conditions that are more restrictive on excessive trading than those stated in this prospectus.

**Excessive Trading Policy**

The Board of Trustees has adopted policies designed to discourage excessive trading of fund shares. Excessive trading activity in a fund is measured by the number of roundtrip transactions in a shareholder's account and each class of a multiple class fund is treated separately. A roundtrip transaction occurs when a shareholder sells fund shares (including exchanges) within 30 days of the purchase date.

Shareholders with two or more roundtrip transactions in a single fund within a rolling 90-day period will be blocked from making additional purchases or exchange purchases of the fund for 85 days. Shareholders with four or more roundtrip transactions across all Fidelity® funds within any rolling 12-month period will be blocked for at least 85 days from additional purchases or exchange purchases across all Fidelity® funds. Any roundtrip within 12 months of the expiration of a multi-fund block will initiate another multi-fund block. Repeat offenders may be subject to long-term or permanent blocks on purchase or exchange purchase transactions in any account under the shareholder's control at any time. In addition to enforcing these roundtrip limitations, the fund may in its discretion restrict, reject, or cancel any purchases or exchanges that, in the Adviser's opinion, may be disruptive to the management of the fund or otherwise not be in the fund's interests.

**Exceptions** 

The following transactions are exempt from the fund's excessive trading policy described above: (i) systematic withdrawal and/or contribution programs, (ii) mandatory retirement distributions, (iii) transactions initiated by a plan sponsor or sponsors of certain employee benefit plans or other related accounts, (iv) transactions within a qualified advisory program, and (v) transactions initiated by the trustee or adviser to a donor-advised charitable gift fund, qualified fund of funds, or other strategy funds.

A qualified advisory program is one that demonstrates to Fidelity that the program has investment strategies and trading policies designed to protect the interests of long-term investors and meets specific criteria outlined by Fidelity.

A qualified fund of funds is a mutual fund, qualified tuition program, or other strategy fund consisting of qualified plan assets that either applies the fund's excessive trading policies to shareholders at the fund of funds level, or demonstrates that the fund of funds has an investment strategy coupled with policies designed to control frequent trading that are reasonably likely to be effective as determined by the fund's Treasurer.

Fidelity may choose not to monitor transactions below certain dollar value thresholds.

**Omnibus Accounts**

Omnibus accounts, in which shares are held in the name of an intermediary on behalf of multiple investors, are a common form of holding shares among retirement plans and financial intermediaries such as brokers, advisers, and third-party administrators. Individual trades in omnibus accounts are often not disclosed to the fund, making it difficult to determine whether a particular shareholder is engaging in excessive trading. Excessive trading in omnibus accounts is likely to go undetected by the fund and may increase costs to the fund and disrupt its portfolio management .

Under policies adopted by the Board of Trustees, intermediaries will be permitted to apply the fund's excessive trading policy (described above), or their own excessive trading policy if approved by the Adviser. In these cases, the fund will typically not request or receive individual account data but will rely on the intermediary to monitor trading activity in good faith in accordance with its or the fund's policies. Reliance on intermediaries increases the risk that excessive trading may go undetected. For other intermediaries, the fund will generally monitor trading activity at the omnibus account level to attempt to identify disruptive trades. The fund may request transaction information, as frequently as daily, from any intermediary at any time, and may apply the fund's policy to transactions that exceed thresholds established by the Board of Trustees. The fund may prohibit purchases of fund shares by an intermediary or by some or all of any intermediary's clients. There is no assurance that the Adviser will request data with sufficient frequency to detect or deter excessive trading in omnibus accounts effectively.

If you purchase or sell fund shares through a financial intermediary, you may wish to contact the intermediary to determine the policies applicable to your account.

**Retirement Plans** 

For employer-sponsored retirement plans, only participant directed exchanges count toward the roundtrip limits. Employer-sponsored retirement plan participants whose activity triggers a purchase or exchange block will be permitted one trade every calendar quarter. In the event of a block, employer and participant contributions and loan repayments by the participant may still be invested in the fund.

**Other Information about the Excessive Trading Policy** 

The fund's Treasurer is authorized to suspend the fund's policies during periods of severe market turbulence or national emergency. The fund reserves the right to modify its policies at any time without prior notice.

The fund does not knowingly accommodate frequent purchases and redemptions of fund shares by investors, except to the extent permitted by the policies described above.

As described in "Valuing Shares," the fund also uses fair value pricing to help reduce arbitrage opportunities available to short-term traders. There is no assurance that the fund's excessive trading policy will be effective, or will successfully detect or deter excessive or disruptive trading.

**Buying Shares**

**Eligibility**

Shares are generally available only to investors residing in the United States.

Each class of the fund has different expenses and features, as described in the applicable prospectus. Investors eligible to purchase one class of shares may also be eligible to purchase other classes of shares of the fund. Your investment professional, as applicable, can help you choose the class of shares that best suits your investment needs. However, plan participants may purchase only the classes of shares that are eligible for sale and available through their plan. Certain classes may have higher expenses than those offered by the plan.

**Additional Information Regarding Class I Eligibility**

Class I shares generally are offered to:

1. Certain employer-sponsored retirement plans. For this purpose, employer-sponsored retirement plans generally include profit sharing, 401(k), 403(b), 457(b), defined benefit, retiree health savings plans, and similar plans, but generally do not include: retail retirement or non-retirement accounts; Individual Retirement Accounts (IRAs) (such as traditional, Roth, SEP, SARSEP, and SIMPLE IRAs); Coverdell Education Savings Accounts; individual 403(b) accounts that are not part of an employer's 403(b) plan; plans investing through the Fidelity Advisor® 403(b) program; plans covering self-employed individuals and their employees (formerly Keogh/H.R. 10 plans); health savings accounts; or qualified tuition programs;

2. Insurance company separate accounts;

3. Broker-dealer, registered investment adviser, insurance company, trust institution and bank trust department managed account programs that charge an asset-based fee;

4. Current or former Trustees or officers of a Fidelity® fund or current or retired officers, directors, or regular employees of FMR LLC or FIL Limited or their direct or indirect subsidiaries (Fidelity Trustee or employee), spouses of Fidelity Trustees or employees, Fidelity Trustees or employees acting as a custodian for a minor child, persons acting as trustee of a trust for the sole benefit of the minor child of a Fidelity Trustee or employee, or employee benefit plans sponsored by FMR LLC or an affiliate;

5. Any state, county, or city, or any governmental instrumentality, department, authority or agency;

6. Charitable organizations (as defined for purposes of Section 501(c)(3) of the Internal Revenue Code) or charitable remainder trusts or life income pools established for the benefit of a charitable organization;

7. Qualified tuition programs for which Fidelity serves as investment manager, or mutual funds managed by Fidelity or other parties;

8. Employer-sponsored health savings accounts investing through an intermediary;

9. Former Destiny® Planholders who exchange, or have exchanged, from Class O to Class I of Fidelity Advisor® funds;

10. Investors who purchase shares through brokerage programs of certain brokers acting solely as agents for their customers and that have entered into an agreement with the distributor to offer Class I shares through such programs. An investor transacting in such programs may be required to pay a commission and/or other forms of compensation to the broker; and

11. Investors whose account is no longer associated with a financial intermediary and whose shares were exchanged by Fidelity from Class A, Class M, or Class C of the fund to Class I shares of the same fund; only in certain employee benefit plan accounts may such investors add to their position in Class I.

Investors may be able to purchase Class I in other circumstances. Please contact Fidelity or your investment professional for more information about Class I shares.

**Additional Information Regarding Class Z Eligibility**

Class Z shares generally are offered to:

1. Certain employer-sponsored retirement plans. For this purpose, employer-sponsored retirement plans generally include profit sharing, 401(k), 403(b), 457(b), defined benefit, retiree health savings plans, and similar plans, but generally do not include: retail retirement or non-retirement accounts; Individual Retirement Accounts (IRAs) (such as traditional, Roth, SEP, SARSEP, and SIMPLE IRAs); Coverdell Education Savings Accounts; individual 403(b) accounts that are not part of an employer's 403(b) plan; plans investing through the Fidelity Advisor® 403(b) program; plans covering self-employed individuals and their employees (formerly Keogh/H.R. 10 plans); health savings accounts; or qualified tuition programs;

2. Broker-dealer, registered investment adviser, insurance company, trust institution and bank trust department managed account programs that charge an asset-based fee;

3. Investors who purchase shares through brokerage programs of certain brokers acting solely as agents for their customers and that have entered into an agreement with the distributor to offer Class Z shares through such programs. An investor transacting in such programs may be required to pay a commission and/or other forms of compensation to the broker;

4. Mutual funds dedicated for use in Fidelity's managed account programs, and investment vehicles dedicated for use by the Fidelity Investments Charitable Gift Fund, for which Fidelity serves as investment manager; and

5. Employee benefit plans sponsored by FMR LLC or an affiliate.

Investors may be able to purchase Class Z in other circumstances. Please contact Fidelity or your investment professional for more information about Class Z shares.

There is no minimum balance or purchase minimum for fund shares.

**Price to Buy**

The price to buy one share of Class A or Class M is its offering price or its NAV, depending on whether you pay a front-end sales charge.

The price to buy one share of Class C, Class I, or Class Z is its NAV. Class C shares are sold without a front-end sales charge, but may be subject to a CDSC upon redemption. Class I and Class Z shares are sold without a sales charge.

If you pay a front-end sales charge, your price will be Class A's or Class M's offering price. When you buy Class A or Class M shares at the offering price, Fidelity deducts the appropriate sales charge and invests the rest in Class A or Class M shares of the fund. If you qualify for a front-end sales charge waiver, your price will be Class A's or Class M's NAV.

The offering price of Class A or Class M is its NAV plus the sales charge. The offering price is calculated by dividing Class A's or Class M's NAV by the difference between one and the applicable front-end sales charge percentage and rounding to the nearest cent.

The dollar amount of the sales charge for Class A or Class M is the difference between the offering price of the shares purchased and the NAV of those shares. Since the offering price per share is calculated to the nearest cent using standard rounding criteria, the percentage sales charge you actually pay may be higher or lower than the sales charge percentages shown in this prospectus due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV.

Shares will be bought at the offering price or NAV, as applicable, next calculated after an order is received in proper form.

It is the responsibility of your investment professional to transmit your order to buy shares to Fidelity before the close of business on the day you place your order.

The fund has authorized certain intermediaries to accept orders to buy shares on its behalf. When authorized intermediaries receive an order in proper form, the order is considered as being placed with the fund, and shares will be bought at the offering price or NAV, as applicable, next calculated after the order is received by the authorized intermediary. If applicable, orders by funds of funds for which Fidelity serves as investment manager will be treated as received by the fund at the same time that the corresponding orders are received in proper form by the funds of funds.

The fund may stop offering shares completely or may offer shares only on a limited basis, for a period of time or permanently.

If your payment is not received and collected, your purchase may be canceled and you could be liable for any losses or fees the fund or Fidelity has incurred.

Shares can be bought or sold through investment professionals using an automated order placement and settlement system that guarantees payment for orders on a specified date.

Certain financial institutions that meet creditworthiness criteria established by FDC may enter confirmed purchase orders on behalf of customers by phone, with payment to follow no later than close of business on the next business day. If payment is not received by that time, the order will be canceled and the financial institution will be liable for any losses.

Under applicable anti-money laundering rules and other regulations, purchase orders may be suspended, restricted, or canceled and the monies may be withheld.

**Selling Shares**

The price to sell one share of Class A, Class M, or Class C is its NAV, minus any applicable CDSC. The price to sell one share of Class I or Class Z is its NAV.

Shares will be sold at the NAV next calculated after an order is received in proper form, minus any applicable CDSC.

Normally, redemptions will be processed by the next business day, but it may take up to seven days to pay the redemption proceeds if making immediate payment would adversely affect the fund.

It is the responsibility of your investment professional to transmit your order to sell shares to Fidelity before the close of business on the day you place your order.

The fund has authorized certain intermediaries to accept orders to sell shares on its behalf. When authorized intermediaries receive an order in proper form, the order is considered as being placed with the fund, and shares will be sold at the NAV next calculated after the order is received by the authorized intermediary, minus any applicable CDSC. If applicable, orders by funds of funds for which Fidelity serves as investment manager will be treated as received by the fund at the same time that the corresponding orders are received in proper form by the funds of funds.

See "Policies Concerning the Redemption of Fund Shares" below for additional redemption information.

A signature guarantee is designed to protect you and Fidelity from fraud. Fidelity may require that your request be made in writing and include a signature guarantee in certain circumstances, such as:

* When you wish to sell more than $100,000 worth of shares.

* When the address on your account (record address) has changed within the last 15 days or you are requesting that a check be mailed to an address different than the record address.

* When you are requesting that redemption proceeds be paid to someone other than the account owner.

* In certain situations when the redemption proceeds are being transferred to a Fidelity® brokerage or mutual fund account with a different registration.

You should be able to obtain a signature guarantee from a bank, broker-dealer, credit union (if authorized under state law), securities exchange or association, clearing agency, or savings association. A notary public cannot provide a signature guarantee.

When you place an order to sell shares, note the following:

* Redemption proceeds (other than exchanges) may be delayed until money from prior purchases sufficient to cover your redemption has been received and collected.

* Redemptions may be suspended or payment dates postponed when the NYSE is closed (other than weekends or holidays), when trading on the NYSE is restricted, or as permitted by the SEC.

* Redemption proceeds may be paid in securities or other property rather than in cash if the Adviser determines it is in the best interests of the fund.

* You will not receive interest on amounts represented by uncashed redemption checks.

* Under applicable anti-money laundering rules and other regulations, redemption requests may be suspended, restricted, canceled, or processed and the proceeds may be withheld.

Class Z: When your relationship with your managed account provider is terminated, your shares may be sold at the NAV next calculated, in which case the redemption proceeds will remain in your account pending your instruction.

**Policies Concerning the Redemption of Fund Shares**

*If your account is held directly with a fund ,* the length of time that a fund typically expects to pay redemption proceeds depends on the method you have elected to receive such proceeds. A fund typically expects to make payment of redemption proceeds by wire, automated clearing house (ACH) or by issuing a check by the next business day following receipt of a redemption order in proper form. Proceeds from the periodic and automatic sale of shares of a Fidelity® money market fund that are used to buy shares of another Fidelity® fund are settled simultaneously.

*If your account is held through an intermediary ,* the length of time that a fund typically expects to pay redemption proceeds depends, in part, on the terms of the agreement in place between the intermediary and a fund. For redemption proceeds that are paid either directly to you from a fund or to your intermediary for transmittal to you, a fund typically expects to make payments by wire, by ACH or by issuing a check on the next business day following receipt of a redemption order in proper form from the intermediary by a fund. Redemption orders that are processed through investment professionals that utilize the National Securities Clearing Corporation will generally settle one to three business days following receipt of a redemption order in proper form.

As noted elsewhere, payment of redemption proceeds may take longer than the time a fund typically expects and may take up to seven days from the date of receipt of the redemption order as permitted by applicable law.

**Redemption Methods Available.** Generally a fund expects to pay redemption proceeds in cash. To do so, a fund typically expects to satisfy redemption requests either by using available cash (or cash equivalents) or by selling portfolio securities. On a less regular basis, a fund may also satisfy redemption requests by utilizing one or more of the following sources, if permitted: borrowing from another Fidelity® fund; drawing on an available line or lines of credit from a bank or banks; or using reverse repurchase agreements. These methods may be used during both normal and stressed market conditions.

In addition to paying redemption proceeds in cash, a fund reserves the right to pay part or all of your redemption proceeds in readily marketable securities instead of cash (redemption in-kind). Redemption in-kind proceeds will typically be made by delivering the selected securities to the redeeming shareholder within seven days after the receipt of the redemption order in proper form by a fund.

**Converting Shares**

The fund will automatically convert your class of shares of the fund to Class Z shares, if Class Z of the fund is available under your plan.

The fund may convert your Class Z shares to another class of shares of the fund, including classes of shares not offered in this prospectus that are available under your plan, if your plan is no longer eligible to offer Class Z. Information on the other classes of shares of the fund can be found in that class's prospectus. Investors will be notified in writing before any such conversion to another class.

A conversion will be based on the respective NAVs of the two classes, without the imposition of any fees, on the trade date of the conversion. A conversion between share classes of the same fund is a non-taxable event.

**Conversion Feature** . After a maximum of eight years from the initial date of purchase, Class C shares convert automatically to Class A shares of a fund. Conversion to Class A shares will be made at NAV. At the time of conversion, a portion of the Class C shares bought through the reinvestment of dividends or capital gains (Dividend Shares) will also convert to Class A shares. The portion of Dividend Shares that will convert is determined by the ratio of your converting Class C non-Dividend Shares to your total Class C non-Dividend Shares. A fund may convert shares sooner in certain circumstances. A shorter holding period may also apply depending on your intermediary. Please see "Sales Charge Waiver Policies Applied by Certain Intermediaries" in the "Appendix" section of this prospectus.

**Exchanging Shares**

An exchange involves the redemption of all or a portion of the shares of one fund and the purchase of shares of another fund.

As a Class A shareholder, you have the privilege of exchanging Class A shares for the same class of shares of other Fidelity® funds that offer Advisor classes of shares at NAV or for Daily Money Class shares of Fidelity® funds that offer Daily Money Class shares.

As a Class M shareholder, you have the privilege of exchanging Class M shares for the same class of shares of other Fidelity® funds that offer Advisor classes of shares at NAV or for Advisor M Class shares of Fidelity® Government Money Market Fund. If you purchased your Class M shares through certain investment professionals that have signed an agreement with FDC, you also have the privilege of exchanging your Class M shares for shares of Fidelity® Capital Appreciation Fund.

As a Class C shareholder, you have the privilege of exchanging Class C shares for the same class of shares of other Fidelity® funds that offer Advisor classes of shares or for Advisor C Class shares of Fidelity® Treasury Money Market Fund.

As a Class I shareholder, you have the privilege of exchanging Class I shares for the same class of shares of other Fidelity® funds that offer Advisor classes of shares or for shares of Fidelity® funds.

As a Class Z shareholder, you have the privilege of exchanging Class Z shares for the same class of shares of other Fidelity® funds that offer Advisor classes of shares or Class Z shares of other Fidelity® funds available through your employee benefit plan, or if the Fidelity® fund does not offer Class Z shares, then other classes of the Fidelity® fund that are available through your plan.

Through your investment professional, you may also move between certain share classes of the same fund. For more information, see the Statement of Additional Information (SAI) or consult your investment professional.

However, you should note the following policies and restrictions governing exchanges:

* The exchange limit may be modified for accounts held by certain institutional retirement plans to conform to plan exchange limits and Department of Labor regulations. See your retirement plan materials for further information.

* The fund may refuse any exchange purchase for any reason. For example, the fund may refuse exchange purchases by any person or group if, in the Adviser's judgment, the fund would be unable to invest the money effectively in accordance with its investment objective and policies, or would otherwise potentially be adversely affected.

* An exchange of shares is not subject to any applicable CDSCs.

* Before any exchange, read the prospectus for the shares you are purchasing, including any purchase and sale requirements.

* The shares you are acquiring by exchange must be available for sale in your state.

* Exchanges may have tax consequences for you if you own shares in a taxable account.

* If you are exchanging between accounts that are not registered in the same name, address, and taxpayer identification number (TIN), there may be additional requirements.

* Under applicable anti-money laundering rules and other regulations, exchange requests may be suspended, restricted, canceled, or processed and the proceeds may be withheld.

The fund may terminate or modify exchange privileges in the future.

Other funds may have different exchange restrictions and minimums. Check each fund's prospectus for details.

**Rollover IRAs**

Class Z shares generally are not available to IRA rollover accounts. Assets from retirement plans may be invested in other class(es) of shares of the fund through an IRA rollover, including class(es) of shares not offered in this prospectus. Each class of the fund has different expenses and features and may have higher expenses than Class Z shares. Information on the other class(es) of shares of the fund, including any class expenses and features, can be found in the applicable class's prospectus.

Please contact your investment professional for more information.

**Account Features and Policies**

**Features**

The following features may be available to buy and sell shares of the fund. Visit institutional.fidelity.com or contact your investment professional for more information.

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|:---|
| **Electronic Funds Transfer (Fidelity Advisor Money Line®): electronic money movement through the Automated Clearing House** <br>To transfer money between a bank account and your fund account. You can use electronic funds transfer to: _Make periodic (automatic) purchases of shares. _Make periodic (automatic) redemptions of shares.  |
| **Wire: electronic money movement through the Federal Reserve wire system** <br>To transfer money between a bank account and your fund account.  |
| **Automatic Transactions: periodic (automatic) transactions** <br>To make contributions from your fund account to your Fidelity Advisor® IRA. <br> To sell shares of a Fidelity® money market fund and simultaneously to buy shares of a Fidelity® fund that offers Advisor classes of shares. |

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**Policies**

The following apply to you as a shareholder.

**Statements** that Fidelity sends to you, if applicable, include the following:

* Confirmation statements (after transactions affecting your fund balance except, to the extent applicable, reinvestment of distributions in the fund or another fund and certain transactions through automatic investment or withdrawal programs).

* Monthly or quarterly account statements (detailing fund balances and all transactions completed during the prior month or quarter).

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 1-877-208-0098. We will begin sending individual copies to you within 30 days of receiving your call.

You may initiate many **transactions by telephone or electronically.** Fidelity will not be responsible for any loss, cost, expense, or other liability resulting from unauthorized transactions if it follows reasonable security procedures designed to verify the identity of the investor. Fidelity will request personalized security codes or other information, and may also record calls. For transactions conducted through the Internet, Fidelity recommends the use of an Internet browser with 128-bit encryption. You should verify the accuracy of your confirmation statements upon receipt and notify Fidelity immediately of any discrepancies in your account activity. If you do not want the ability to sell and exchange by telephone, call Fidelity for instructions. Additional documentation may be required from corporations, associations, and certain fiduciaries.

You may be asked to provide additional information in order for Fidelity to verify your identity in accordance with requirements under anti-money laundering regulations. Accounts may be restricted and/or closed, and the monies withheld, pending verification of this information or as otherwise required under these and other federal regulations. In addition, the fund reserves the right to involuntarily redeem an account in the case of: (i) actual or suspected threatening conduct or actual or suspected fraudulent, illegal or suspicious activity by the account owner or any other individual associated with the account; or (ii) the failure of the account owner to provide information to the fund related to opening the accounts. Your shares will be sold at the NAV, minus any applicable shareholder fees, calculated on the day Fidelity closes your fund position.

Fidelity may charge a **fee for certain services,** such as providing historical account documents.

**Dividends and Capital Gain Distributions**

The fund earns interest, dividends, and other income from its investments, and distributes this income (less expenses) to shareholders as dividends. The fund also realizes capital gains from its investments, and distributes these gains (less any losses) to shareholders as capital gain distributions.

The fund normally declares dividends and pays capital gain distributions per the tables below:

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| | |
|:---|:---|
| **Fund Name**  | **Dividends Paid**  |
| Fidelity® Sustainable Low Duration Bond Fund  | Declares daily and pays monthly  |

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| | |
|:---|:---|
| **Fund Name**  | **Capital Gains Paid**  |
| Fidelity® Sustainable Low Duration Bond Fund  | October, December  |

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**Earning Dividends** 

The fund processes purchase and redemption requests only on days it is open for business.

When you buy shares, your method of payment will determine when dividends begin to accrue. For example, shares purchased through an investment professional using the National Securities Clearing Corporation generally begin to earn dividends on the day the fund receives payment for those shares. Shares purchased through an investment professional by any other method generally begin to earn dividends on the first business day following the day the fund receives payment. If you purchase your shares directly from the fund by check or wire, those shares generally begin to earn dividends on the first business day following the day you placed your purchase order.

Shares sold through an investment professional using the National Securities Clearing Corporation generally earn dividends until, but not including, the day redemption proceeds are processed. Shares sold through an investment professional by any other method generally earn dividends until, but not including, the first business day following the day redemption proceeds are processed. Shares sold other than through an investment professional generally earn dividends until, but not including, the first business day following the day of redemption.

Exchange requests will be processed only when both funds are open for business.

**Distribution Options** 

When you open an account, specify how you want to receive your distributions. The following distribution options are available:

* **1. Reinvestment Option.** 

Any dividends and capital gain distributions will be automatically reinvested in additional shares. If you do not indicate a choice, you will be assigned this option.

* **2. Income-Earned Option.** 

Any capital gain distributions will be automatically reinvested in additional shares. Any dividends will be paid in cash.

* **3. Cash Option.** 

Any dividends and capital gain distributions will be paid in cash.

* **4. Directed Dividends**® **Option.**

Any dividends will be automatically invested in the same class of shares of another identically registered Fidelity® fund. Any capital gain distributions will be automatically invested in the same class of shares of another identically registered Fidelity® fund, automatically reinvested in additional shares of the fund, or paid in cash.

Not all distribution options may be available for every account and certain restrictions may apply. If the option you prefer is not listed on your account application, or if you want to change your current option, contact Fidelity or your investment professional directly.

If you elect to receive distributions paid in cash by check and the U.S. Postal Service does not deliver your checks, your distribution option may be converted to the Reinvestment Option. You will not receive interest on amounts represented by uncashed distribution checks.

Any dividends and capital gain distributions paid to retirement plan participants will be automatically reinvested.

**Tax Consequences**

As with any investment, your investment in the fund could have tax consequences for you (for non-retirement accounts).

**Taxes on Distributions**

Distributions you receive from the fund are subject to federal income tax, and may also be subject to state or local taxes.

For federal tax purposes, certain distributions, including dividends and distributions of short-term capital gains, are taxable to you as ordinary income, while certain distributions, including distributions of long-term capital gains, are taxable to you generally as capital gains. Because the fund's income is primarily derived from interest, dividends from the fund generally will not qualify for the long-term capital gains tax rates available to individuals.

If you buy shares when a fund has realized but not yet distributed income or capital gains, you will be "buying a dividend" by paying the full price for the shares and then receiving a portion of the price back in the form of a taxable distribution.

Any taxable distributions you receive from the fund will normally be taxable to you when you receive them, regardless of your distribution option.

If you elect to receive distributions in cash or to invest distributions automatically in the same class of shares of another Fidelity <sup>®</sup> fund that offers Advisor classes of shares or shares of Fidelity <sup>®</sup> funds, you will receive certain December distributions in January, but those distributions will be taxable as if you received them on December 31.

Distributions by the fund to tax-advantaged retirement plan accounts are not taxable currently (but you may be taxed later, upon withdrawal of your investment from such account).

**Taxes on Transactions**

Your redemptions, including exchanges, may result in a capital gain or loss for federal tax purposes. A capital gain or loss on your investment in the fund generally is the difference between the cost of your shares and the price you receive when you sell them.

Exchanges within a tax-advantaged retirement plan account will not result in a capital gain or loss for federal tax purposes. Please consult your tax advisor regarding the tax treatment of distributions from a tax-advantaged retirement plan account.

**Fund Services**

**Fund Management**

The fund is a mutual fund, an investment that pools shareholders' money and invests it toward a specified goal.

**Adviser**

**FMR.** The Adviser is the fund's manager. The address of the Adviser is 245 Summer Street, Boston, Massachusetts 02210.

As of December 31, 2021, the Adviser had approximately $3.6 trillion in discretionary assets under management, and approximately $4.5 trillion when combined with all of its affiliates' assets under management.

As the manager, the Adviser has overall responsibility for directing the fund's investments and handling its business affairs.

**Sub-Adviser(s)**

**FMR Investment Management (UK) Limited (FMR UK)** , at 1 St. Martin's Le Grand, London, EC1A 4AS, United Kingdom, serves as a sub-adviser for the fund. As of December 31, 2021, FMR UK had approximately $30.9 billion in discretionary assets under management. FMR UK is an affiliate of the Adviser.

FMR UK may provide investment research and advice on issuers based outside the United States and may also provide investment advisory services for the fund.

**Fidelity Management & Research (Hong Kong) Limited (FMR H.K.)** , at Floor 19, 41 Connaught Road Central, Hong Kong, serves as a sub-adviser for the fund. As of December 31, 2021, FMR H.K. had approximately $19.0 billion in discretionary assets under management. FMR H.K. is an affiliate of the Adviser.

FMR H.K. may provide investment research and advice on issuers based outside the United States and may also provide investment advisory services for the fund.

**Fidelity Management & Research (Japan) Limited (FMR Japan)** , at Kamiyacho Prime Place, 1-17, Toranomon-4-Chome, Minato-ku, Tokyo, Japan, serves as a sub-adviser for the fund. As of March 31, 2022, FMR Japan had approximately $6.9 billion in discretionary assets under management. FMR Japan is an affiliate of the Adviser.

FMR Japan may provide investment research and advice on issuers based outside the United States and may also provide investment advisory services for the fund.

**Portfolio Manager(s)**

David DeBiase is Co-Portfolio Manager of the fund, which he has managed since 2022. He also manages other funds. Since joining Fidelity Investments in 2006, Mr. DeBiase has worked as a trader and portfolio manager.

Robert Galusza is Co-Portfolio Manager of the fund, which he has managed since 2022. He also manages other funds. Since joining Fidelity Investments in 1987, Mr. Galusza has worked as a research analyst and portfolio manager.

Julian Potenza is Co-Portfolio Manager of the fund, which he has managed since 2022. He also manages other funds. Since joining Fidelity Investments in 2007, Mr. Potenza has worked as a research analyst and portfolio manager.

The SAI provides additional information about the compensation of, any other accounts managed by, and any fund shares held by the portfolio manager(s).

From time to time a manager, analyst, or other Fidelity employee may express views regarding a particular company, security, industry, or market sector. The views expressed by any such person are the views of only that individual as of the time expressed and do not necessarily represent the views of Fidelity or any other person in the Fidelity organization. Any such views are subject to change at any time based upon market or other conditions and Fidelity disclaims any responsibility to update such views. These views may not be relied on as investment advice and, because investment decisions for a fund are based on numerous factors, may not be relied on as an indication of trading intent on behalf of any fund.

**Advisory Fee(s)**

The fund pays a management fee to the Adviser.

The management fee is calculated and paid to the Adviser every month.

The Adviser pays all of the other expenses of the fund with certain exceptions.

Prior to April 1, 2023, the annual management fee rate, as a percentage of the fund's average net assets, is shown in the following table:

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| | |
|:---|:---|
| **Fund**  | **Management Fee Rate**  |
| Fidelity® Sustainable Low Duration Bond Fund  | 0.30%  |

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Effective April 1, 2023, the Adviser reduced the fund's management fee rate to 0.20%.

The Adviser pays FMR Investment Management (UK) Limited, Fidelity Management & Research (Hong Kong) Limited, and Fidelity Management & Research (Japan) Limited for providing sub-advisory services.

The basis for the Board of Trustees approving the management contract and sub-advisory agreements for the fund is available in the fund's annual report for the fiscal period ended August 31, 2022.

From time to time, the Adviser or its affiliates may agree to reimburse or waive certain fund expenses while retaining the ability to be repaid if expenses fall below the specified limit prior to the end of the fiscal year.

Reimbursement or waiver arrangements can decrease expenses and boost performance.

FMR has contractually agreed to reimburse Class A, Class M, and Class C of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of their respective average net assets, exceed 0.45%, 0.45%, and 1.30% (the Expense Caps). If at any time during the current fiscal year expenses for Class A, Class M, or Class C of the fund fall below the Expense Caps, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Caps. These arrangements will remain in effect through December 31, 2024. FMR may not terminate these arrangements before the expiration date without the approval of the Board of Trustees and may extend them in its discretion after that date.

**Fund Distribution**

The fund is composed of multiple classes of shares. All classes of the fund have a common investment objective and investment portfolio.

FDC distributes Class A, Class M, Class C, Class I, and Class Z shares.

Intermediaries may receive from the Adviser, FDC, and/or their affiliates compensation for their services intended to result in the sale of class shares, including compensation for providing recordkeeping and administrative services, as well as other retirement plan expenses for Class Z shares.

This may take the form of (as applicable):

* Sales charges and concessions (not applicable to Class I and Class Z shares).

* Distribution and/or service (12b-1) fees (not applicable to Class I and Class Z shares).

* Finder's fees (not applicable to Class C, Class I, and Class Z shares).

* Payments for additional distribution-related activities and/or shareholder services.

* Payments for educational seminars and training, including seminars sponsored by Fidelity, or by an intermediary.

These payments are described in more detail in this section and in the SAI.

Please speak with your investment professional to learn more about any payments his or her firm may receive from the Adviser, FDC, and/or their affiliates, as well as fees and/or commissions the investment professional charges. You should also consult disclosures made by your investment professional at the time of purchase.

You may pay a sales charge when you buy or sell your Class A, Class M, and Class C shares.

FDC collects the sales charge.

As described in detail in this section, you may be entitled to a waiver of your sales charge, or to pay a reduced sales charge, when you buy or sell Class A, Class M, and Class C shares. In the event of changes in sales charges, sales charges, if any, in effect at the time of purchase generally will apply.

The availability of certain sales charge waivers and discounts may depend on whether you purchase your shares directly from a fund or through an intermediary. Intermediaries may have different policies and procedures regarding the availability of front-end sales load waivers or CDSC (back-end) waivers. Please see "Sales Charge Waiver Policies Applied by Certain Intermediaries" in the "Appendix" section of the prospectus. In all instances, it is the purchaser's responsibility to notify a fund or the purchaser's intermediary at the time of purchase of any relationship or other facts qualifying the purchaser for sales charge waivers or discounts. **For waivers and discounts not available through a particular intermediary, shareholders will have to purchase fund shares directly from a fund or through another intermediary to receive these waivers or discounts.**

The front-end sales charge will be reduced for purchases of Class A and Class M shares according to the sales charge schedules below.

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| | | | |
|:---|:---|:---|:---|
| **Sales Charges and Concessions - Class A**  | **Sales Charges and Concessions - Class A**  | **Sales Charges and Concessions - Class A**  | **Sales Charges and Concessions - Class A**  |
| **Sales Charge**  | **Sales Charge**  | **Sales Charge**  | **Sales Charge**  |
|  | **As a % of** <br> **offering** <br> **price** <sup>(a)</sup>  | **As an** <br> **approximate** <br> **% of net** <br> **amount** <br> **invested** <sup>(a)</sup>  | **Investment** <br> **professional** <br> **concession** <br> **as % of** <br> **offering** <br> **price**  |
| Less than $250,000 <sup>(b)</sup>  | 1.50%  | 1.52%  | 1.25%  |
| $250,000 or more  |  |  | finders fee <sup>(c)</sup>  |

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<sup>(a)</sup> The actual sales charge you pay may be higher or lower than those calculated using these percentages due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV.

<sup>(b)</sup> Purchases of $10.00 or less will not pay a sales charge.

<sup>(c)</sup> Certain conditions and exceptions apply. See "Fund Services - Fund Distribution - Finder's Fees."

Investments in Class A shares of $250,000 or more may, upon redemption less than nine months after purchase, for any reason, be assessed a CDSC of 0.50% (shares with respect to which a 0.50% finder's fee is paid at the time of purchase) or 0.75% (shares recordkept in a Fidelity Advisor® 401(k) Retirement Plan). The actual CDSC you pay may be higher or lower than that calculated using this percentage due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV.

When exchanging Class A shares of one fund for Class A shares of another Fidelity® fund that offers Advisor classes of shares or Daily Money Class shares of another Fidelity® fund that offers Daily Money Class shares, your Class A shares retain the CDSC schedule in effect when they were originally bought.

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| | | | |
|:---|:---|:---|:---|
| **Sales Charges and Concessions - Class M**  | **Sales Charges and Concessions - Class M**  | **Sales Charges and Concessions - Class M**  | **Sales Charges and Concessions - Class M**  |
| **Sales Charge**  | **Sales Charge**  | **Sales Charge**  | **Sales Charge**  |
|  | **As a % of** <br> **offering** <br> **price** <sup>(a)</sup>  | **As an** <br> **approximate** <br> **% of net** <br> **amount** <br> **invested** <sup>(a)</sup>  | **Investment** <br> **professional** <br> **concession** <br> **as % of** <br> **offering** <br> **price**  |
| Less than $250,000 <sup>(b)</sup>  | 1.50%  | 1.52%  | 1.25%  |
| $250,000 or more  |  |  | 0.25% <sup>(c)</sup>  |

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<sup>(a)</sup> The actual sales charge you pay may be higher or lower than those calculated using these percentages due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV.

<sup>(b)</sup> Purchases of $10.00 or less will not pay a sales charge.

<sup>(c)</sup> Certain conditions and exceptions apply. See "Fund Services - Fund Distribution - Finder's Fees."

Investments in Class M shares of $250,000 or more may, upon redemption less than one year after purchase, for any reason, be assessed a CDSC of 0.25% if a finder's fee is paid at the time the shares are purchased. The actual CDSC you pay may be higher or lower than that calculated using this percentage due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV.

When exchanging Class M shares of one fund for Class M shares of another Fidelity® fund that offers Advisor classes of shares or Advisor M Class shares of Fidelity® Government Money Market Fund, your Class M shares retain the CDSC schedule in effect when they were originally bought.

Class A or Class M shares purchased by an individual or company through the Combined Purchase, Rights of Accumulation, or Letter of Intent program may receive a reduced front-end sales charge according to the sales charge schedules above. To qualify for a Class A or Class M front-end sales charge reduction under one of these programs, you must notify Fidelity in advance of your purchase.

**Combined Purchase, Rights of Accumulation, and Letter of Intent Programs.** The following qualify as an "individual" or "company" for the purposes of determining eligibility for the Combined Purchase and Rights of Accumulation program: an individual, spouse, and their children under age 21 purchasing for his/her or their own account; a trustee, administrator, or other fiduciary purchasing for a single trust estate or a single fiduciary account or for a single or parent-subsidiary group of "employee benefit plans" (except SEP and SARSEP plans and plans covering self-employed individuals and their employees (formerly Keogh/H.R. 10 plans)) and 403(b) programs; and tax-exempt organizations (as defined in Section 501(c)(3) of the Internal Revenue Code). The following qualify as an "individual" or "company" for the purposes of determining eligibility for the Letter of Intent program: an individual, spouse, and their children under age 21 purchasing for his/her or their own account; a trustee, administrator, or other fiduciary purchasing for a single trust estate or a single fiduciary account (except SEP and SARSEP plans and plans covering self-employed individuals and their employees (formerly Keogh/H.R. 10 plans)); an IRA or plans covering sole-proprietors (formerly Keogh/H.R. 10 plans); plans investing through the Fidelity Advisor® 403(b) program; and tax-exempt organizations (as defined in Section 501(c)(3) of the Internal Revenue Code).

**Combined Purchase.** To receive a Class A or Class M front-end sales charge reduction, if you are a new shareholder, you may combine your purchase of Class A or Class M shares with purchases of: (i) Class A, Class M, and Class C shares of any Fidelity® fund that offers Advisor classes of shares, (ii) Advisor C Class shares of Fidelity® Treasury Money Market Fund, and (iii) Class A Units (New and Old), Class C Units, Class D Units, and Class P Units of the Fidelity Advisor® 529 Plan. Purchases may be aggregated across multiple intermediaries on the same day for the purpose of qualifying for the Combined Purchase program.

**Rights of Accumulation.** To receive a Class A or Class M front-end sales charge reduction, if you are an existing shareholder, you may add to your purchase of Class A or Class M shares the current value of your holdings in: (i) Class A, Class M, and Class C shares of any Fidelity® fund that offers Advisor classes of shares, (ii) Advisor C Class shares of Fidelity® Treasury Money Market Fund, (iii) Daily Money Class shares of a fund that offers Daily Money Class shares acquired by exchange from any Fidelity® fund that offers Advisor classes of shares, (iv) Class O shares of Fidelity Advisor® Diversified Stock Fund and Fidelity Advisor® Capital Development Fund, and (v) Class A Units (New and Old), Class C Units, Class D Units, and Class P Units of the Fidelity Advisor® 529 Plan. The current value of your holdings is determined at the NAV at the close of business on the day prior to your purchase of Class A or Class M shares. The current value of your holdings will be added to your purchase of Class A or Class M shares for the purpose of qualifying for the Rights of Accumulation program. Purchases and holdings may be aggregated across multiple intermediaries for the purpose of qualifying for the Rights of Accumulation program.

**Letter of Intent.** You may receive a Class A or Class M front-end sales charge reduction on your purchases of Class A and Class M shares made during a 13-month period by signing a Letter of Intent (Letter). File your Letter with Fidelity no later than the date of the initial purchase toward completing your Letter. Each Class A or Class M purchase you make toward completing your Letter will be entitled to the reduced front-end sales charge applicable to the total investment indicated in the Letter. Purchases of the following may be aggregated for the purpose of completing your Letter: (i) Class A and Class M shares of any Fidelity® fund that offers Advisor classes of shares (except those acquired by exchange from Daily Money Class shares of a fund that offers Daily Money Class shares that had been previously exchanged from a Fidelity® fund that offers Advisor classes of shares), (ii) Class C shares of any Fidelity® fund that offers Advisor classes of shares, (iii) Advisor C Class shares of Fidelity® Treasury Money Market Fund, and (iv) Class A Units (New and Old), Class C Units, Class D Units, and Class P Units of the Fidelity Advisor® 529 Plan. Reinvested income and capital gain distributions will not be considered purchases for the purpose of completing your Letter. Purchases may be aggregated across multiple intermediaries for the purpose of qualifying for the Letter of Intent program. Your initial purchase toward completing your Letter must be at least 5% of the total investment specified in your Letter. Fidelity will register Class A or Class M shares equal to 5% of the total investment specified in your Letter in your name and will hold those shares in escrow. You will earn income, dividends and capital gain distributions on escrowed Class A and Class M shares. The escrow will be released when you complete your Letter. You are not obligated to complete your Letter. If you do not complete your Letter, you must pay the increased front-end sales charges due in accordance with the sales charge schedule in effect when your shares were originally bought. Fidelity may redeem sufficient escrowed Class A or Class M shares to pay any applicable front-end sales charges. If you purchase more than the amount specified in your Letter and qualify for additional Class A or Class M front-end sales charge reductions, the front-end sales charge will be adjusted to reflect your total purchase at the end of 13 months and the surplus amount will be applied to your purchase of additional Class A or Class M shares at the then-current offering price applicable to the total investment.

Detailed information about these programs also is available on institutional.fidelity.com. In order to obtain the benefit of a front-end sales charge reduction for which you may be eligible, you may need to inform your investment professional of other accounts you, your spouse, or your children maintain with your investment professional or other investment professionals from the same intermediary.

Class C shares may, upon redemption less than one year after purchase, for any reason, be assessed a CDSC of 1.00%. The actual CDSC you pay may be higher or lower than that calculated using this percentage due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV.

Investment professionals will receive as compensation from FDC, at the time of the sale, a concession equal to 1.00% of your purchase of Class C shares. A concession will not apply to Class C shares acquired through reinvestment of dividends or capital gain distributions.

The CDSC, if any, for Class A, Class M, and Class C shares will be calculated based on the lesser of the cost of each class's shares, as applicable, at the initial date of purchase or the value of those shares, as applicable, at redemption, not including any reinvested dividends or capital gains. Class A, Class M, and Class C shares acquired through reinvestment of dividends or capital gain distributions will not be subject to a CDSC. In determining the applicability and rate of any CDSC at redemption, shares representing reinvested dividends and capital gains will be redeemed first, followed by those shares that have been held for the longest period of time, provided that Class A shares not subject to a CDSC will be redeemed before Class A shares subject to a CDSC, even if the Class A shares subject to a CDSC have been held longer.

A front-end sales charge will not apply to the following Class A or Class M shares:

* **1.** Purchased for an employee benefit plan other than a plan investing through the Fidelity Advisor® 403(b) program. For this purpose, employee benefit plans generally include 401(a), 401(k), 403(b), and 457(b) governmental plans, but do not include: IRAs, SIMPLE, SEP, or SARSEP plans; or health savings accounts.

* **2.** Purchased for an insurance company separate account.

* **3.** Purchased for managed account programs that charge an asset-based fee by a broker-dealer, registered investment adviser, insurance company, trust institution or bank trust department.

* **4.** Purchased with the proceeds of a redemption of Fidelity® or Fidelity Advisor® fund shares held in (i) an insurance company separate account, or (ii) an employee benefit plan (as described in waiver number 1 above, including the Fidelity Advisor® 403(b) program), the proceeds of which must be reinvested directly into Fidelity Advisor® fund shares held in an account for which Fidelity Management Trust Company or an affiliate serves as custodian.

* **5.** Purchased with any proceeds of a distribution from a Fidelity® recordkept employee benefit plan (as described in waiver number 1 above, including the Fidelity Advisor® 403(b) program) that is rolled directly into a Fidelity Advisor® IRA for which Fidelity Management Trust Company or an affiliate serves as custodian.

* **6.** Purchased by a bank trust officer, registered representative, or other employee (or a member of one of their immediate families) of intermediaries having agreements with FDC. A member of the immediate family of a bank trust officer, a registered representative, or other employee of intermediaries having agreements with FDC, is a spouse of one of those individuals, an account for which one of those individuals is acting as custodian for a minor child, and a trust account that is registered for the sole benefit of a minor child of one of those individuals.

* **7.** Purchased to repay a loan against Class A or Class M shares held in the investor's Fidelity Advisor® 403(b) program.

* **8.** Purchased for an employer-sponsored health savings account.

* **9.** (Applicable only to Class A) Purchased by a former Destiny® Planholder in a Fidelity Advisor® account that was converted directly from a Destiny® Plan account after September 30, 2008. This waiver shall apply as long as the ownership of the Fidelity Advisor® account does not change. If the Fidelity Advisor® account is no longer directly held at Fidelity, your intermediary may be able to apply the waiver, assuming the stated conditions are met. Please contact your investment professional for more information.

* **10.** Purchased for a mutual fund only brokerage platform that charges a platform entrance fee and where the distributor has agreed with the broker to participate in such platform.

Pursuant to Rule 22d-1 under the Investment Company Act of 1940 (1940 Act), FDC exercises its right to waive Class A's and Class M's front-end sales charge on shares acquired through reinvestment of dividends and capital gain distributions or in connection with a fund's merger with or acquisition of any investment company or trust. FDC also exercises its right to waive Class A's and Class M's front-end sales charge on purchases of $10.00 or less.

The CDSC may be waived on the redemption of shares (applies to Class A, Class M, and Class C, unless otherwise noted):

* **1.** For disability or death.

* **2.** From employer-sponsored retirement plans (except SIMPLE IRAs, SEPs, and SARSEPs) in accordance with required minimum distributions as mandated by the Internal Revenue Code and related regulations.

* **3.** For required minimum distributions from Traditional IRAs, Rollover IRAs, SIMPLE IRAs, SEPs, and SARSEPs (excludes Roth accounts) as mandated by the Internal Revenue Code and related regulations.

* **4.** Through the Fidelity Advisor® Systematic Withdrawal Program, if the amount does not exceed 12% of the account balance in a rolling 12-month period.

* **5.** (Applicable to Class A and Class M only) Held by insurance company separate accounts.

* **6.** (Applicable to Class A and Class M only) From an employee benefit plan (except SIMPLE IRAs, SEPs, SARSEPs, and plans covering self-employed individuals and their employees) or 403(b) programs (except Fidelity Advisor® 403(b) programs for which Fidelity or an affiliate serves as custodian).

* **7.** (Applicable to Class A and Class M only) On which a finder's fee was eligible to be paid to an investment professional at the time of purchase, but was not paid because payment was declined (to determine your eligibility for this CDSC waiver, please ask your investment professional if he or she received a finder's fee at the time of purchase).

* **8.** (Applicable to Class C only) On which investment professionals did not receive a concession at the time of purchase.

To qualify for a Class A or Class M front-end sales charge reduction or waiver, you must notify Fidelity in advance of your purchase.

You may be required to notify Fidelity in advance of your redemption to qualify for a Class A, Class M, or Class C CDSC waiver.

Information on sales charge reductions and waivers is available free of charge on institutional.fidelity.com.

**Finder's Fees.** Finder's fees may be paid to investment professionals who sell Class A and Class M shares in purchase amounts of $250,000 or more. For Class A share purchases, investment professionals may be compensated at the time of purchase with a finder's fee at the rate of 0.50% of the purchase amount. Such Class A purchases may be subject, upon redemption, to a CDSC of 0.50% if redeemed less than nine months after purchase for any reason, and the actual CDSC you pay may be higher or lower than the stated percentage due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV. For Class M share purchases, investment professionals may be compensated at the time of purchase with a finder's fee at the rate of 0.25% of the purchase amount.

Investment professionals may be eligible for a finder's fee on the following purchases of Class A and Class M shares made through broker-dealers and banks: a trade that brings the value of the accumulated account(s) of an investor, including a 403(b) program or an employee benefit plan (except a SEP or SARSEP plan or a plan covering self-employed individuals and their employees (formerly a Keogh/H.R. 10 plan)), over $250,000; a trade for an investor with an accumulated account value of $250,000 or more; and an incremental trade toward an investor's Letter.

Accumulated account value for purposes of finder's fees eligibility is determined the same as it is for Rights of Accumulation. Daily Money Class shares of a fund that offers Daily Money Class shares are not counted for this purpose unless acquired by exchange from any Fidelity® fund that offers Advisor classes of shares. For information, see "Combined Purchase, Rights of Accumulation, and Letter of Intent Programs" above.

Finder's fees are not paid in connection with purchases of Class A or Class M shares by insurance company separate accounts or managed account programs that charge an asset-based fee, or purchases of Class A or Class M shares made with the proceeds from the redemption of shares of any Fidelity® fund or any retirement plan recordkept at Fidelity.

Investment professionals should contact Fidelity in advance to determine if they qualify to receive a finder's fee.

**Finder's Fees (Fidelity Advisor® 401(k) Retirement Plans only).** Finder's fees will be paid in connection with shares recordkept in a Fidelity Advisor® 401(k) Retirement Plan only at the time of the initial conversion of assets. For Class A conversions to a Fidelity Advisor® 401(k) Retirement Plan, investment professionals may be compensated at the time of purchase with a finder's fee at the rate of 0.75% of the purchase amount for purchases of $1 million but less than $4 million, 0.50% of the purchase amount for purchases of $4 million but less than $25 million, and 0.25% of the purchase amount for purchases of $25 million or more. When a finder's fee is paid, the investment professional concession as a percentage of the offering price is paid at a blended rate. Such Class A purchases may be subject, upon redemption, to a CDSC of 0.75% if redeemed less than 18 months after purchase. For Class M conversions of $1 million or more to a Fidelity Advisor® 401(k) Retirement Plan, investment professionals may be compensated at the time of purchase with a finder's fee at the rate of 0.25% of the purchase amount. Such Class M purchases may be subject, upon redemption, to a CDSC of 0.25% if redeemed less than one year after purchase. Such Class A and Class M purchases may be subject to a CDSC upon redemption for any reason, and the actual CDSC you pay may be higher or lower than the stated percentage due to rounding. The impact of rounding may vary with the amount of your investment and the size of the class's NAV.

Investment professionals should contact Fidelity for more information.

**Reinstatement Privilege.** If you have sold all or part of your Class A, Class M, or Class C shares of the fund, you may reinvest an amount equal to all or a portion of the redemption proceeds in the same class of the fund or another Fidelity® fund that offers Advisor classes of shares, at the NAV next determined after receipt in proper form of your investment order, provided that such reinvestment is made within 90 days of redemption. Under these circumstances, the dollar amount of the CDSC you paid, if any, on shares will be reimbursed to you by reinvesting that amount in Class A, Class M, or Class C shares, as applicable.

You must reinstate your shares into an account with the same registration. This privilege may be exercised only once by a shareholder with respect to the fund and certain restrictions may apply. For purposes of the CDSC schedule, the holding period will continue as if the Class A, Class M, or Class C shares had not been redeemed. To qualify for the reinstatement privilege, you must notify Fidelity in writing in advance of your reinvestment.

**Distribution and Service Plan(s)**

Class A of the fund has adopted a Distribution and Service Plan pursuant to Rule 12b-1 under the 1940 Act. Under the plan, Class A of the fund is authorized to pay FDC a monthly 12b-1 (distribution) fee as compensation for providing services intended to result in the sale of Class A shares. Class A of the fund may pay this 12b-1 (distribution) fee at an annual rate of 0.15% of its average net assets, or such lesser amount as the Trustees may determine from time to time. Currently, the Trustees have not approved such payments. The Trustees may approve 12b-1 (distribution) fee payments at an annual rate of up to 0.15% of Class A's average net assets when the Trustees believe that it is in the best interests of Class A shareholders to do so.

In addition, pursuant to the Class A plan, Class A of the fund is authorized to pay FDC a monthly 12b-1 (service) fee as compensation for providing shareholder support services. Class A of the fund may pay this 12b-1 (service) fee at an annual rate of 0.25% of its average net assets, or such lesser amount as the Trustees may determine from time to time. Class A currently pays FDC a monthly 12b-1 (service) fee at an annual rate of 0.15% of its average net assets throughout the month. Class A's 12b-1 (service) fee rate may be increased only when the Trustees believe it is in the best interests of Class A shareholders to do so.

Except as provided below, FDC may reallow up to the full amount of this 12b-1 (service) fee to intermediaries, including its affiliates, for providing shareholder support services.

For purchases of Class A shares on which a finder's fee is paid to intermediaries, after the first nine months of investment, FDC may reallow up to the full amount of the 12b-1 (service) fee paid by such shares to intermediaries, including its affiliates, for providing shareholder support services.

Class M has adopted a Distribution and Service Plan pursuant to Rule 12b-1 under the 1940 Act. Under the plan, Class M is authorized to pay FDC a monthly 12b-1 (service) fee as compensation for providing shareholder support services. Class M currently pays this monthly 12b-1 (service) fee at an annual rate of 0.15% of its average net assets throughout the month.

FDC may reallow up to the full amount of this 12b-1 (service) fee to intermediaries, including its affiliates, for providing shareholder support services.

Class C of the fund has adopted a Distribution and Service Plan pursuant to Rule 12b-1 under the 1940 Act. Under the plan, Class C of the fund is authorized to pay FDC a monthly 12b-1 (distribution) fee as compensation for providing services intended to result in the sale of Class C shares. Class C of the fund currently pays FDC a monthly 12b-1 (distribution) fee at an annual rate of 0.75% of its average net assets throughout the month.

In addition, pursuant to the Class C plan, Class C of the fund pays FDC a monthly 12b-1 (service) fee at an annual rate of 0.25% of Class C's average net assets throughout the month for providing shareholder support services.

Normally, after the first year of investment, FDC may reallow up to the full amount of the 12b-1 (distribution) fees to intermediaries, including its affiliates, for providing services intended to result in the sale of Class C shares and may reallow up to the full amount of the 12b-1 (service) fee to intermediaries, including its affiliates, for providing shareholder support services.

For purchases of Class C shares made through reinvestment of dividends or capital gain distributions, during the first year of investment and thereafter, FDC may reallow up to the full amount of this 12b-1 (distribution) fee paid by such shares to intermediaries, including its affiliates, for providing services intended to result in the sale of Class C shares and may reallow up to the full amount of this 12b-1 (service) fee paid by such shares to intermediaries, including its affiliates, for providing shareholder support services.

Any fees paid out of Class A's, Class M's, and Class C's assets on an ongoing basis pursuant to a Distribution and Service Plan will increase the cost of your investment and may cost you more than paying other types of sales charges.

In addition to the above payments, each Class A, Class M, and Class C plan specifically recognizes that the Adviser may make payments from its management fee revenue, past profits, or other resources to FDC for expenses incurred in connection with providing services intended to result in the sale of Class A, Class M, and Class C shares and/or shareholder support services. The Adviser, directly or through FDC or one or more affiliates, may pay significant amounts to intermediaries that provide those services. Currently, the Board of Trustees of the fund has authorized such payments for Class A, Class M, and Class C.

Each of Class I and Class Z of the fund has adopted a Distribution and Service Plan pursuant to Rule 12b-1 under the 1940 Act that recognizes that the Adviser may use its management fee revenues, as well as its past profits or its resources from any other source, to pay FDC for expenses incurred in connection with providing services intended to result in the sale of Class I and Class Z shares and/or shareholder support services. The Adviser, directly or through FDC, may pay significant amounts to intermediaries that provide those services. Currently, the Board of Trustees of the fund has authorized such payments for Class I and Class Z.

If payments made by the Adviser to FDC or to intermediaries under Class I's and Class Z's Distribution and Service Plan were considered to be paid out of Class I's and Class Z's assets on an ongoing basis, they might increase the cost of your investment and might cost you more than paying other types of sales charges.

No dealer, sales representative, or any other person has been authorized to give any information or to make any representations, other than those contained in this prospectus and in the related SAI, in connection with the offer contained in this prospectus. If given or made, such other information or representations must not be relied upon as having been authorized by the fund or FDC. This prospectus and the related SAI do not constitute an offer by the fund or by FDC to sell shares of the fund to, or to buy shares of the fund from, any person to whom it is unlawful to make such offer.

**Appendix**

**Financial Highlights**

Financial Highlights are intended to help you understand the financial history of fund shares for the past 5 years (or, if shorter, the period of operations). Certain information reflects financial results for a single share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in shares (assuming reinvestment of all dividends and distributions). The annual information has been audited by Deloitte & Touche LLP, independent registered public accounting firm, whose report(s), along with fund financial statements, is included in the annual report. Annual reports are available for free upon request.

**Fidelity Advisor® Sustainable Low Duration Bond Fund Class A** <br>

---

| | |
|:---|:---|
| Years ended August 31,  | 2022 <sup>A</sup>  |
| **Selected Per-Share Data**  |  |
| Net asset value, beginning of period  | $10.00  |
| Income from Investment Operations  |  |
| Net investment income (loss) <sup>B,C</sup>  | .053  |
| Net realized and unrealized gain (loss)  | (.058)  |
| Total from investment operations  | (.005)  |
| Distributions from net investment income  | (.035)  |
| Total distributions  | (.035)  |
| Net asset value, end of period  | $9.96  |
| **Total Return** <sup>D,E</sup>  | (.05)%  |
| **Ratios to Average Net Assets** <sup>F,G,C</sup>  |  |
| Expenses before reductions  | .51% <sup>H</sup>  |
| Expenses net of fee waivers, if any  | .51% <sup>H</sup>  |
| Expenses net of all reductions  | .51% <sup>H</sup>  |
| Net investment income (loss)  | 1.40% <sup>H</sup>  |
| **Supplemental Data**  |  |
| Net assets, end of period (000 omitted)  | $1730  |
| Portfolio turnover rate <sup>I</sup>  | 5% <sup>J</sup>  |

---

<sup>A</sup> For the period April 13, 2022 (commencement of operations) through August 31, 2022.

<sup>B</sup> Calculated based on average shares outstanding during the period.

<sup>C</sup> Net investment income (loss) is affected by the timing of the declaration of dividends by any underlying mutual funds or exchange-traded funds (ETFs). Net investment income (loss) of any mutual funds or ETFs is not included in the Fund's net investment income (loss) ratio.

<sup>D</sup> Total returns for periods of less than one year are not annualized.

<sup>E</sup> Total returns do not include the effect of the sales charges.

<sup>F</sup> Fees and expenses of any underlying mutual funds or exchange-traded funds (ETFs) are not included in the Fund's expense ratio. The Fund indirectly bears its proportionate share of these expenses. For additional expense information related to investments in Fidelity Central Funds, please refer to the "Investments in Fidelity Central Funds" note found in the Notes to Financial Statements section of the most recent Annual or Semi-Annual report.

<sup>G</sup> Expense ratios reflect operating expenses of the class. Expenses before reductions do not reflect amounts reimbursed, waived, or reduced through arrangements with the investment adviser, brokerage services, or other offset arrangements, if applicable, and do not represent the amount paid by the class during periods when reimbursements, waivers or reductions occur.

<sup>H</sup> Annualized.

<sup>I</sup> Amount does not include the portfolio activity of any underlying mutual funds or exchange-traded funds (ETFs).

<sup>J</sup> Amount not annualized.

**Fidelity Advisor® Sustainable Low Duration Bond Fund Class M** <br>

---

| | |
|:---|:---|
| Years ended August 31,  | 2022 <sup>A</sup>  |
| **Selected Per-Share Data**  |  |
| Net asset value, beginning of period  | $10.00  |
| Income from Investment Operations  |  |
| Net investment income (loss) <sup>B,C</sup>  | .054  |
| Net realized and unrealized gain (loss)  | (.059)  |
| Total from investment operations  | (.005)  |
| Distributions from net investment income  | (.035)  |
| Total distributions  | (.035)  |
| Net asset value, end of period  | $9.96  |
| **Total Return** <sup>D,E</sup>  | (.05)%  |
| **Ratios to Average Net Assets** <sup>F,G,C</sup>  |  |
| Expenses before reductions  | .51% <sup>H</sup>  |
| Expenses net of fee waivers, if any  | .51% <sup>H</sup>  |
| Expenses net of all reductions  | .51% <sup>H</sup>  |
| Net investment income (loss)  | 1.40% <sup>H</sup>  |
| **Supplemental Data**  |  |
| Net assets, end of period (000 omitted)  | $515  |
| Portfolio turnover rate <sup>I</sup>  | 5% <sup>J</sup>  |

---

<sup>A</sup> For the period April 13, 2022 (commencement of operations) through August 31, 2022.

<sup>B</sup> Calculated based on average shares outstanding during the period.

<sup>C</sup> Net investment income (loss) is affected by the timing of the declaration of dividends by any underlying mutual funds or exchange-traded funds (ETFs). Net investment income (loss) of any mutual funds or ETFs is not included in the Fund's net investment income (loss) ratio.

<sup>D</sup> Total returns for periods of less than one year are not annualized.

<sup>E</sup> Total returns do not include the effect of the sales charges.

<sup>F</sup> Fees and expenses of any underlying mutual funds or exchange-traded funds (ETFs) are not included in the Fund's expense ratio. The Fund indirectly bears its proportionate share of these expenses. For additional expense information related to investments in Fidelity Central Funds, please refer to the "Investments in Fidelity Central Funds" note found in the Notes to Financial Statements section of the most recent Annual or Semi-Annual report.

<sup>G</sup> Expense ratios reflect operating expenses of the class. Expenses before reductions do not reflect amounts reimbursed, waived, or reduced through arrangements with the investment adviser, brokerage services, or other offset arrangements, if applicable, and do not represent the amount paid by the class during periods when reimbursements, waivers or reductions occur.

<sup>H</sup> Annualized.

<sup>I</sup> Amount does not include the portfolio activity of any underlying mutual funds or exchange-traded funds (ETFs).

<sup>J</sup> Amount not annualized.

**Fidelity Advisor® Sustainable Low Duration Bond Fund Class C** <br>

---

| | |
|:---|:---|
| Years ended August 31,  | 2022 <sup>A</sup>  |
| **Selected Per-Share Data**  |  |
| Net asset value, beginning of period  | $10.00  |
| Income from Investment Operations  |  |
| Net investment income (loss) <sup>B,C</sup>  | .021  |
| Net realized and unrealized gain (loss)  | (.064)  |
| Total from investment operations  | (.043)  |
| Distributions from net investment income  | (.007)  |
| Total distributions  | (.007)  |
| Net asset value, end of period  | $9.95  |
| **Total Return** <sup>D,E</sup>  | (.43)%  |
| **Ratios to Average Net Assets** <sup>F,G,C</sup>  |  |
| Expenses before reductions  | 1.36% <sup>H</sup>  |
| Expenses net of fee waivers, if any  | 1.36% <sup>H</sup>  |
| Expenses net of all reductions  | 1.36% <sup>H</sup>  |
| Net investment income (loss)  | .55% <sup>H</sup>  |
| **Supplemental Data**  |  |
| Net assets, end of period (000 omitted)  | $759  |
| Portfolio turnover rate <sup>I</sup>  | 5% <sup>J</sup>  |

---

<sup>A</sup> For the period April 13, 2022 (commencement of operations) through August 31, 2022.

<sup>B</sup> Calculated based on average shares outstanding during the period.

<sup>C</sup> Net investment income (loss) is affected by the timing of the declaration of dividends by any underlying mutual funds or exchange-traded funds (ETFs). Net investment income (loss) of any mutual funds or ETFs is not included in the Fund's net investment income (loss) ratio.

<sup>D</sup> Total returns for periods of less than one year are not annualized.

<sup>E</sup> Total returns do not include the effect of the contingent deferred sales charge.

<sup>F</sup> Fees and expenses of any underlying mutual funds or exchange-traded funds (ETFs) are not included in the Fund's expense ratio. The Fund indirectly bears its proportionate share of these expenses. For additional expense information related to investments in Fidelity Central Funds, please refer to the "Investments in Fidelity Central Funds" note found in the Notes to Financial Statements section of the most recent Annual or Semi-Annual report.

<sup>G</sup> Expense ratios reflect operating expenses of the class. Expenses before reductions do not reflect amounts reimbursed, waived, or reduced through arrangements with the investment adviser, brokerage services, or other offset arrangements, if applicable, and do not represent the amount paid by the class during periods when reimbursements, waivers or reductions occur.

<sup>H</sup> Annualized.

<sup>I</sup> Amount does not include the portfolio activity of any underlying mutual funds or exchange-traded funds (ETFs).

<sup>J</sup> Amount not annualized.

**Fidelity Advisor® Sustainable Low Duration Bond Fund Class I** <br>

---

| | |
|:---|:---|
| Years ended August 31,  | 2022 <sup>A</sup>  |
| **Selected Per-Share Data**  |  |
| Net asset value, beginning of period  | $10.00  |
| Income from Investment Operations  |  |
| Net investment income (loss) <sup>B,C</sup>  | .060  |
| Net realized and unrealized gain (loss)  | (.059)  |
| Total from investment operations  | .001  |
| Distributions from net investment income  | (.041)  |
| Total distributions  | (.041)  |
| Net asset value, end of period  | $9.96  |
| **Total Return** <sup>D,E</sup>  | .01%  |
| **Ratios to Average Net Assets** <sup>F,G,C</sup>  |  |
| Expenses before reductions  | .37% <sup>H</sup>  |
| Expenses net of fee waivers, if any  | .35% <sup>H</sup>  |
| Expenses net of all reductions  | .35% <sup>H</sup>  |
| Net investment income (loss)  | 1.56% <sup>H</sup>  |
| **Supplemental Data**  |  |
| Net assets, end of period (000 omitted)  | $526  |
| Portfolio turnover rate <sup>I</sup>  | 5% <sup>J</sup>  |

---

<sup>A</sup> For the period April 13, 2022 (commencement of operations) through August 31, 2022.

<sup>B</sup> Calculated based on average shares outstanding during the period.

<sup>C</sup> Net investment income (loss) is affected by the timing of the declaration of dividends by any underlying mutual funds or exchange-traded funds (ETFs). Net investment income (loss) of any mutual funds or ETFs is not included in the Fund's net investment income (loss) ratio.

<sup>D</sup> Total returns for periods of less than one year are not annualized.

<sup>E</sup> Total returns would have been lower if certain expenses had not been reduced during the applicable periods shown.

<sup>F</sup> Fees and expenses of any underlying mutual funds or exchange-traded funds (ETFs) are not included in the Fund's expense ratio. The Fund indirectly bears its proportionate share of these expenses. For additional expense information related to investments in Fidelity Central Funds, please refer to the "Investments in Fidelity Central Funds" note found in the Notes to Financial Statements section of the most recent Annual or Semi-Annual report.

<sup>G</sup> Expense ratios reflect operating expenses of the class. Expenses before reductions do not reflect amounts reimbursed, waived, or reduced through arrangements with the investment adviser, brokerage services, or other offset arrangements, if applicable, and do not represent the amount paid by the class during periods when reimbursements, waivers or reductions occur.

<sup>H</sup> Annualized.

<sup>I</sup> Amount does not include the portfolio activity of any underlying mutual funds or exchange-traded funds (ETFs).

<sup>J</sup> Amount not annualized.

**Fidelity Advisor® Sustainable Low Duration Bond Fund Class Z** <br>

---

| | |
|:---|:---|
| Years ended August 31,  | 2022 <sup>A</sup>  |
| **Selected Per-Share Data**  |  |
| Net asset value, beginning of period  | $10.00  |
| Income from Investment Operations  |  |
| Net investment income (loss) <sup>B,C</sup>  | .061  |
| Net realized and unrealized gain (loss)  | (.058)  |
| Total from investment operations  | .003  |
| Distributions from net investment income  | (.043)  |
| Total distributions  | (.043)  |
| Net asset value, end of period  | $9.96  |
| **Total Return** <sup>D,E</sup>  | .03%  |
| **Ratios to Average Net Assets** <sup>F,G,C</sup>  |  |
| Expenses before reductions  | .35% <sup>H</sup>  |
| Expenses net of fee waivers, if any  | .30% <sup>H</sup>  |
| Expenses net of all reductions  | .30% <sup>H</sup>  |
| Net investment income (loss)  | 1.61% <sup>H</sup>  |
| **Supplemental Data**  |  |
| Net assets, end of period (000 omitted)  | $962  |
| Portfolio turnover rate <sup>I</sup>  | 5% <sup>J</sup>  |

---

<sup>A</sup> For the period April 13, 2022 (commencement of operations) through August 31, 2022.

<sup>B</sup> Calculated based on average shares outstanding during the period.

<sup>C</sup> Net investment income (loss) is affected by the timing of the declaration of dividends by any underlying mutual funds or exchange-traded funds (ETFs). Net investment income (loss) of any mutual funds or ETFs is not included in the Fund's net investment income (loss) ratio.

<sup>D</sup> Total returns for periods of less than one year are not annualized.

<sup>E</sup> Total returns would have been lower if certain expenses had not been reduced during the applicable periods shown.

<sup>F</sup> Fees and expenses of any underlying mutual funds or exchange-traded funds (ETFs) are not included in the Fund's expense ratio. The Fund indirectly bears its proportionate share of these expenses. For additional expense information related to investments in Fidelity Central Funds, please refer to the "Investments in Fidelity Central Funds" note found in the Notes to Financial Statements section of the most recent Annual or Semi-Annual report.

<sup>G</sup> Expense ratios reflect operating expenses of the class. Expenses before reductions do not reflect amounts reimbursed, waived, or reduced through arrangements with the investment adviser, brokerage services, or other offset arrangements, if applicable, and do not represent the amount paid by the class during periods when reimbursements, waivers or reductions occur.

<sup>H</sup> Annualized.

<sup>I</sup> Amount does not include the portfolio activity of any underlying mutual funds or exchange-traded funds (ETFs).

<sup>J</sup> Amount not annualized.

**Additional Index Information**

**Bloomberg US Treasury Bill: 6-9 Months Index** is a market value-weighted index of investment-grade fixed-rate public obligations of the U.S. Treasury with maturities between six and nine months.

**Sales Charge Waiver Policies Applied by Certain Intermediaries**

<u>Ameriprise</u>

The following information applies to Class A shares purchases if you have an account with or otherwise purchase fund shares through Ameriprise Financial:

Shareholders purchasing fund shares through an Ameriprise Financial brokerage account are eligible for the following front-end sales charge waivers and discounts, which may differ from those disclosed elsewhere in this prospectus or SAI.

**Class A Shares Front-End Sales Charge Waivers Available at Ameriprise Financial:**

* Employer-sponsored retirement plans (e.g., 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans). For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs or SAR-SEPs.

* Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the same fund family).

* Shares exchanged from Class C shares of the same fund in the month of or following the 7-year anniversary of the purchase date. To the extent that this prospectus elsewhere provides for a waiver with respect to exchanges of Class C shares or conversion of Class C shares following a shorter holding period, that waiver will apply.

* Employees and registered representatives of Ameriprise Financial or its affiliates and their immediate family members.

* Shares purchased by or through qualified accounts (including IRAs, Coverdell Education Savings Accounts, 401(k)s, 403(b) TSCAs subject to ERISA and defined benefit plans) that are held by a covered family member, defined as an Ameriprise financial advisor and/or the advisor's spouse, advisor's lineal ascendant (mother, father, grandmother, grandfather, great grandmother, great grandfather), advisor's lineal descendant (son, step-son, daughter, step-daughter, grandson, granddaughter, great grandson, great granddaughter) or any spouse of a covered family member who is a lineal descendant.

* Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (i.e., Rights of Reinstatement).

<u>D.A. Davidson & Co. (D.A. Davidson)</u>

Shareholders purchasing fund shares including existing fund shareholders through a D.A. Davidson platform or account, or through an introducing broker-dealer or independent registered investment advisor for which D.A. Davidson provides trade execution, clearance, and/or custody services, will be eligible for the following sales charge waivers (front-end sales charge waivers and contingent deferred, or back-end, sales charge waivers) and discounts, which may differ from those disclosed elsewhere in this prospectus or a fund's SAI.

**Front-End Sales Charge Waivers on Class A Shares available at D.A. Davidson**

* Shares purchased within the same fund family through a systematic reinvestment of capital gains and dividend distributions.

* Employees and registered representatives of D.A. Davidson or its affiliates and their family members as designated by D.A. Davidson.

* Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales charge (known as Rights of Reinstatement).

* A shareholder in the fund's Class C Shares will have their shares converted at net asset value to Class A Shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is consistent with D.A. Davidson's policies and procedures.

**CDSC Waivers on Class A and Class C Shares available at D.A. Davidson**

* Death or disability of the shareholder.

* Shares sold as part of a systematic withdrawal plan as described in a fund's prospectus.

* Return of excess contributions from an IRA account.

* Shares sold as part of a required minimum distribution for IRA or other qualifying retirement accounts pursuant to the Internal Revenue Code.

* Shares acquired through a right of reinstatement.

**Front-end sales charge discounts available at D.A. Davidson: breakpoints, rights of accumulation and/or letters of intent**

* Breakpoints as described in this prospectus.

* Rights of accumulation which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser's household at D.A. Davidson. Eligible fund family assets not held at D.A. Davidson may be included in the calculation of rights of accumulation only if the shareholder notifies his or her financial advisor about such assets.

* Letters of intent which allow for breakpoint discounts based on anticipated purchases within a fund family, over a 13-month time period. Eligible fund family assets not held at D.A. Davidson may be included in the calculation of letters of intent only if the shareholder notifies his or her financial advisor about such assets.

<u>Edward D. Jones & Co., L.P. ("Edward Jones")</u>

**Policies Regarding Transactions Through Edward Jones**

*The following information has been provided by Edward Jones:*

The following information supersedes prior information with respect to transactions and positions held in fund shares through an Edward Jones system. Clients of Edward Jones (also referred to as "shareholders") purchasing fund shares on the Edward Jones commission and fee-based platforms are eligible only for the following sales charge discounts (also referred to as "breakpoints") and waivers, which can differ from discounts and waivers described elsewhere in the mutual fund prospectus or SAI or through another broker-dealer. In all instances, it is the shareholder's responsibility to inform Edward Jones at the time of purchase of any relationship, holdings of the fund family, or other facts qualifying the purchaser for discounts or waivers. Edward Jones can ask for documentation of such circumstance. Shareholders should contact Edward Jones if they have questions regarding their eligibility for these discounts and waivers.

**Breakpoints**

• Breakpoint pricing, otherwise known as volume pricing, at dollar thresholds as described in the prospectus.

**Rights of Accumulation ("ROA"):**

* The applicable sales charge on a purchase of Class A shares is determined by taking into account all share classes (except certain money market funds and any assets held in group retirement plans) of the mutual fund family held by the shareholder or in an account grouped by Edward Jones with other accounts for the purpose of providing certain pricing considerations ("pricing groups"). If grouping assets as a shareholder, this includes all share classes held on the Edward Jones platform and/or held on another platform. The inclusion of eligible fund family assets in the ROA calculation is dependent on the shareholder notifying Edward Jones of such assets at the time of calculation. Money market funds are included only if such shares were sold with a sales charge at the time of purchase or acquired in exchange for shares purchased with a sales charge.

* The employer maintaining a SEP IRA plan and/or SIMPLE IRA plan may elect to establish or change ROA for the IRA accounts associated with the plan to a plan-level grouping as opposed to including all share classes at a shareholder or pricing group level.

* ROA is determined by calculating the higher of cost minus redemptions or market value (current shares x NAV).

**Letter of Intent ("LOI"):**

* Through a LOI, shareholders can receive the sales charge and breakpoint discounts for purchases shareholders intend to make over a 13-month period from the date Edward Jones receives the LOI. The LOI is determined by calculating the higher of cost or market value of qualifying holdings at LOI initiation in combination with the value that the shareholder intends to buy over a 13-month period to calculate the front-end sales charge and any breakpoint discounts. Each purchase the shareholder makes during that 13-month period will receive the sales charge and breakpoint discount that applies to the total amount. The inclusion of eligible fund family assets in the LOI calculation is dependent on the shareholder notifying Edward Jones of such assets at the time of calculation. Purchases made before the LOI is received by Edward Jones are not adjusted under the LOI and will not reduce the sales charge previously paid. Sales charges will be adjusted if LOI is not met.

If the employer maintaining a SEP IRA plan and/or SIMPLE IRA plan has elected to establish or change ROA for the IRA accounts associated with the plan to a plan-level grouping, LOIs will also be at the plan-level and may only be established by the employer.

**Sales Charge Waivers:**

Sales charges are waived for the following shareholders and in the following situations:

* Associates of Edward Jones and its affiliates and their family members who are in the same pricing group (as determined by Edward Jones under its policies and procedures) as the associate. This waiver will continue for the remainder of the associate's life if the associate retires from Edward Jones in good-standing and remains in good standing pursuant to Edward Jones' policies and procedures.

* Shares purchased in an Edward Jones fee-based program. 

* Shares purchased through reinvestment of capital gains distributions and dividend reinvestment.

* Shares purchased from the proceeds of redeemed shares of the same fund family so long as the following conditions are met: 1) the proceeds are from the sale of shares within 60 days of the purchase, and 2) the sale and purchase are made in the same share class and the same account or the purchase is made in an individual retirement account with proceeds from liquidations in a non-retirement account.

* Shares exchanged into Class A shares from another share class so long as the exchange is into the same fund and was initiated at the discretion of Edward Jones. Edward Jones is responsible for any remaining CDSC due to the fund company, if applicable. Any future purchases are subject to the applicable sales charge as disclosed in the prospectus.

* Exchanges from Class C shares to Class A shares of the same fund, generally, in the 84th month following the anniversary of the purchase date or earlier at the discretion of Edward Jones.

**CDSC Waivers:**

If the shareholder purchases shares that are subject to a CDSC and those shares are redeemed before the CDSC is expired, the shareholder is responsible to pay the CDSC except in the following conditions:

* The death or disability of the shareholder.

* Systematic withdrawals with up to 10% per year of the account value.

* Return of excess contributions from an Individual Retirement Account (IRA).

* Shares sold as part of a required minimum distribution for IRA and retirement accounts if the redemption is taken in or after the year the shareholder reaches qualified age based on applicable IRS regulations.

* Shares sold to pay Edward Jones fees or costs in such cases where the transaction is initiated by Edward Jones.

* Shares exchanged in an Edward Jones fee-based program.

* Shares acquired through NAV reinstatement. 

* Shares redeemed at the discretion of Edward Jones for Minimum Balances, as described below.

**Other Important Information Regarding Transactions Through Edward Jones**

**Minimum Purchase Amounts:**

* Initial purchase minimum: $250

* Subsequent purchase minimum: none

**Minimum Balances:**

Edward Jones has the right to redeem at its discretion fund holdings with a balance of $250 or less. The following are examples of accounts that are not included in this policy:

* A fee-based account held on an Edward Jones platform

* A 529 account held on an Edward Jones platform

* An account with an active systematic investment plan or LOI

**Exchanging Share Classes:**

* At any time it deems necessary, Edward Jones has the authority to exchange at NAV a shareholder's holdings in a fund to Class A shares of the same fund.

<u>Janney Montgomery Scott LLC (Janney)</u>

If you purchase fund shares through a Janney brokerage account, you will be eligible for the following load waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in a fund **'** s prospectus or SAI.

**Front-end sales charge\* waivers on Class A shares available at Janney:**

* Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family).

* Shares purchased by employees and registered representatives of Janney or its affiliates and their family members as designated by Janney.

* Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within ninety (90) days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (i.e., right of reinstatement).

* Employer-sponsored retirement plans (e.g., 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans). For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs, SAR-SEPs or Keogh plans.

* Shares acquired through a right of reinstatement.

* Class C shares that are no longer subject to a CDSC and are converted to Class A shares of the same fund pursuant to Janney's policies and procedures.

**CDSC waivers on Class A and C shares available at Janney:**

* Shares sold upon the death or disability of the shareholder.

* Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus.

* Shares sold in connection with a return of excess contributions from an IRA account.

* Shares sold as part of a required minimum distribution for IRA and retirement accounts if the redemption is taken in or after the year the shareholder reaches qualified age based on applicable IRS regulations.

* Shares sold to pay Janney fees but only if the transaction is initiated by Janney.

* Shares acquired through a right of reinstatement.

* Shares exchanged into the same share class of a different fund.

**Front-end sales charge\* discounts available at Janney: breakpoints, rights of accumulation, and/or letters of intent:**

* Breakpoints as described in the fund's prospectus.

* Rights of accumulation (ROA), which entitle shareholders to breakpoint discounts, will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser's household at Janney. Eligible fund family assets not held at Janney may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets.

* Letters of intent which allow for breakpoint discounts based on anticipated purchases within a fund family, over a 13-month time period. Eligible fund family assets not held at Janney Montgomery Scott may be included in the calculation of letters of intent only if the shareholder notifies his or her financial advisor about such assets.

\*Also referred to as an "initial sales charge."

<u>Merrill Lynch</u>

Shareholders purchasing fund shares through a Merrill Lynch platform or account are eligible only for the following load waivers (front-end sales charge waivers and CDSC, or back-end, waivers) and discounts, which may differ from those disclosed elsewhere in this prospectus or SAI.

**Front-end Sales Load Waivers on Class A Shares Available at Merrill Lynch:**

* Employer-sponsored retirement, deferred compensation and employee benefit plans (including health savings accounts) and trusts used to fund those plans, provided that the shares are not held in a commission-based brokerage account and shares are held for the benefit of the plan

* Shares purchased by a 529 Plan (does not include 529 Plan units or 529-specific share classes or equivalents)

* Shares purchased through a Merrill Lynch affiliated investment advisory program

* Shares exchanged due to the holdings moving from a Merrill Lynch affiliated investment advisory program to a Merrill Lynch brokerage (non-advisory) account pursuant to Merrill Lynch's policies relating to sales load discounts and waivers

* Shares purchased by third party investment advisors on behalf of their advisory clients through Merrill Lynch's platform

* Shares of funds purchased through the Merrill Edge Self-Directed platform (if applicable)

* Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family)

* Shares exchanged from Class C (i.e., level-load) shares of the same fund pursuant to Merrill Lynch's policies relating to sales load discounts and waivers

* Employees and registered representatives of Merrill Lynch or its affiliates and their family members

* Directors or Trustees of the fund, and employees of the fund's investment adviser or any of its affiliates, as described in this prospectus

* Eligible shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (known as Rights of Reinstatement). Automated transactions (i.e. systematic purchases and withdrawals) and purchases made after shares are automatically sold to pay Merrill Lynch's account maintenance fees are not eligible for reinstatement

**CDSC Waivers on A, B, and C Shares Available at Merrill Lynch:**

* Death or disability of the shareholder

* Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus

* Return of excess contributions from an IRA Account

* Shares sold as part of a required minimum distribution for IRA and retirement accounts pursuant to the Internal Revenue Code

* Shares sold to pay Merrill Lynch fees but only if the transaction is initiated by Merrill Lynch

* Shares acquired through a right of reinstatement

* Shares held in retirement brokerage accounts, that are exchanged for a lower cost share class due to transfer to certain fee based accounts or platforms (applicable to A and C shares only)

* Shares received through an exchange due to the holdings moving from a Merrill Lynch affiliated investment advisory program to a Merrill Lynch brokerage (non-advisory) account pursuant to Merrill Lynch's policies relating to sales load discounts and waivers

**Front-end Load Discounts Available at Merrill Lynch:**

**Breakpoints, Rights of Accumulation & Letters of Intent**

* Breakpoints as described in this prospectus

* Rights of Accumulation (ROA) which entitle shareholders to breakpoint discounts as described in the fund's prospectus will be automatically calculated based on the aggregated holding of fund family assets held by accounts (including 529 program holdings, where applicable) within the purchaser's household at Merrill Lynch. Eligible fund family assets not held at Merrill Lynch may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets

* Letters of Intent (LOI) which allow for breakpoint discounts based on anticipated purchases within a fund family, through Merrill Lynch, over a 13-month period of time (if applicable)

<u>Morgan Stanley</u>

Shareholders purchasing fund shares through a Morgan Stanley Wealth Management transactional brokerage account are eligible only for the following front-end sales charge waivers with respect to Class A shares, which may differ from and may be more limited than those disclosed elsewhere in this prospectus or SAI.

**Front-end Sales Charge Waivers on Class A Shares Available at Morgan Stanley Wealth Management:**

* Employer-sponsored retirement plans (e.g., 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans). For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs, SAR-SEPs or Keogh plans

* Morgan Stanley employee and employee-related accounts according to Morgan Stanley's account linking rules

* Shares purchased through reinvestment of dividends and capital gains distributions when purchasing shares of the same fund

* Shares purchased through a Morgan Stanley self-directed brokerage account

* Class C (i.e., level-load) shares that are no longer subject to a contingent deferred sales charge and are converted to Class A shares of the same fund pursuant to Morgan Stanley Wealth Management's share class conversion program

* Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales charge

* Your financial intermediary, on your behalf, can also convert Class M shares to Class A shares of the same fund, without a sales charge and on a tax free basis, if they are held in a brokerage account.

**E\*TRADE Front-End Sales Charge Waiver**

Shareholders purchasing fund shares through an E\*TRADE self-directed brokerage account will be eligible for a waiver of the front-end sales charge with respect to Class A shares (or the equivalent). This includes shares purchased through the reinvestment of dividends and capital gains distributions.

<u>Oppenheimer & Co. (OPCO)</u>

Shareholders purchasing fund shares through an OPCO platform or account are eligible only for the following load waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in a fund's prospectus or SAI.

**Front-end Sales Load Waivers on Class A Shares available at OPCO:**

* Employer-sponsored retirement, deferred compensation and employee benefit plans (including health savings accounts) and trusts used to fund those plans, provided that the shares are not held in a commission-based brokerage account and shares are held for the benefit of the plan

* Shares purchased by or through a 529 Plan

* Shares purchased through an OPCO affiliated investment advisory program

* Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family)

* Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (known as rights of reinstatement).

* A shareholder in the fund's Class C shares will have their shares converted at net asset value to Class A shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of OPCO 

* Employees and registered representatives of OPCO or its affiliates and their family members

* Directors or Trustees of the fund, and employees of the fund's investment adviser or any of its affiliates, as described in this prospectus

**CDSC Waivers on A, B and C Shares available at OPCO:**

* Death or disability of the shareholder

* Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus

* Return of excess contributions from an IRA Account

* Shares sold as part of a required minimum distribution for IRA and retirement accounts due to the shareholder reaching the qualified age based on applicable IRS regulations as described in the prospectus

* Shares sold to pay OPCO fees but only if the transaction is initiated by OPCO

* Shares acquired through a right of reinstatement

**Front-end Load Discounts Available at OPCO: Breakpoints, Rights of Accumulation & Letters of Intent:**

* Breakpoints as described in this prospectus.

* Rights of Accumulation (ROA) which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser's household at OPCO. Eligible fund family assets not held at OPCO may be included in the ROA calculation only if the shareholder notifies his or her financial advisor about such assets.

<u>PFS Investments Inc. (PFSI)</u>

**Policies Regarding Fund Purchases Held on the PSS Platform**

The following information supersedes all prior information with respect to transactions and positions held in fund shares purchased through PFSI and held on the mutual fund platform of its affiliate, Primerica Shareholder Services (PSS). Clients of PFSI (also referred to as "shareholders") purchasing fund shares on the PSS platform are eligible only for the following share classes, sales charge discounts (also referred to as "breakpoints") and waivers, which can differ from share classes, discounts and waivers described elsewhere in this prospectus or the related SAI or through another broker-dealer. In all instances, it is the shareholder's responsibility to inform PFSI at the time of a purchase of all holdings of Fidelity Advisor® funds on the PSS platform, or other facts qualifying the purchaser for discounts or waivers. PFSI may request reasonable documentation of such facts and condition the granting of any discount or waiver on the timely receipt of such documents. Shareholders should contact PSS if they have questions regarding their eligibility for these discounts and waivers.

**Share Classes**

* Class A shares are available to non-retirement accounts, individual retirement accounts (IRA), SEP IRAs, SIMPLE IRAs, Keogh Plans, and all other account types. 

* Class C shares are available only to accounts with existing Class C share holdings. 

**Breakpoints**

* Breakpoint pricing at dollar thresholds as described in the prospectus of the fund you are purchasing.

**Rights of Accumulation (ROA)**

* The applicable sales charge on a purchase of Class A shares is determined by taking into account all share classes (except any assets held in group retirement plans) of Fidelity Advisor® funds held by the shareholder on the PSS platform. The inclusion of eligible fund family assets in the ROA calculation is dependent on the shareholder notifying PFSI of such assets at the time of calculation. Shares of money market funds are included only if such shares were acquired in exchange for shares of another Fidelity Advisor® fund purchased with a sales charge. No shares of Fidelity Advisor® funds held by the shareholder away from the PSS platform will be granted ROA with shares of any Fidelity Advisor® fund purchased on the PSS platform. 

* Any SEP IRA plan, any SIMPLE IRA plan or any Payroll Deduction plan (PDP) on the PSS platform will be defaulted to plan-level grouping for purposes of ROA, which allows each participating employee ROA with all other eligible shares held in plan accounts on the PSS platform. At any time, a participating employee may elect to exercise a one-time option to change grouping for purposes of ROA to shareholder-level grouping, which allows the plan account of the electing employee ROA with his/her other eligible holdings on the PSS platform, but not with all other eligible participant holdings in the plan. Eligible shares held in plan accounts electing shareholder-level grouping will not be available for purposes of ROA to plan accounts electing plan-level grouping. 

* ROA is determined by calculating the higher of cost minus redemptions or current market value (current shares x NAV). 

**Letter of Intent (LOI)**

* By executing a LOI, shareholders can receive the sales charge and breakpoint discounts for purchases shareholders intend to make on the PSS platform over a 13-month period, beginning from the date PSS receives the LOI. The purchase price of the LOI is determined by calculating the higher of cost or market value of qualifying holdings at LOI initiation in combination with the dollar amount the shareholder intends to invest over a 13-month period to arrive at total investment for purposes of determining any breakpoint discount and the applicable front-end sales charge. Each purchase the shareholder makes during that 13-month period will receive the sales charge and breakpoint discount that applies to the projected total investment. 

* Only holdings of Fidelity Advisor® funds on the PSS platform are eligible for inclusion in the LOI calculation and the shareholder must notify PFSI of all eligible assets at the time of calculation. 

* Purchases made before the LOI is received by PSS are not adjusted under the LOI, and the LOI will not reduce any sales charge previously paid. Sales charges will be automatically adjusted if the total purchases required by the LOI are not met. 

* If an employer maintaining a SEP IRA plan, SIMPLE IRA plan or non-IRA PDP on the PSS platform has elected to establish or change ROA for the accounts associated with the plan to a plan-level grouping, LOIs will also be at the plan-level and may only be established by the employer. LOIs are not available to PDP IRA plans on the PSS platform with plan-level grouping for purposes of ROA but are available to any participating employee that elects shareholder-level grouping for purposes of ROA.

**Sales Charge Waivers**

Sales charges are waived for the following shareholders and in the following situations on the PSS platform:

* Shares purchased through reinvestment of capital gains distributions and dividend reinvestment. 

* Shares purchased with the proceeds of redeemed shares of the same fund family so long as the following conditions are met: 1) the proceeds are from the sale of shares within 90 days of the purchase, 2) the sale and purchase are made in the same share class and the same account or the purchase is made in an individual retirement account with proceeds from liquidations in a non-retirement account, and 3) the redeemed shares were subject to a front-end or deferred sales load. Automated transactions (i.e., systematic purchases and withdrawals), full or partial transfers or rollovers of retirement accounts, and purchases made after shares are automatically sold to pay account maintenance fees are not eligible for this sales charge waiver. 

* Shares exchanged into Class A shares from another share class so long as the exchange is into the same fund and was initiated at the discretion of PFSI. PFSI is responsible for any remaining CDSC due to the fund company, if applicable. Any future purchases are subject to the applicable sales charge as disclosed in the prospectus.

<u>Raymond James & Associates, Inc., Raymond James Financial Services, Inc. and Each Entity's Affiliates (Raymond James)</u>

**Intermediary-Defined Sales Charge Waiver Policies:**

The availability of certain initial or deferred sales charge waivers and discounts may depend on the particular financial intermediary or type of account through which you purchase or hold fund shares. Intermediaries may have different policies and procedures regarding the availability of front-end sales load waivers or CDSC waivers, which are discussed below. In all instances, it is the purchaser's responsibility to notify the fund or the purchaser's financial intermediary at the time of purchase of any relationship or other facts qualifying the purchaser for sales charge waivers or discounts. For waivers and discounts not available through a particular intermediary, shareholders will have to purchase fund shares directly from the fund or through another intermediary to receive these waivers or discounts.

Shareholders purchasing fund shares through a Raymond James platform or account, or through an introducing broker-dealer or independent registered investment adviser for which Raymond James provides trade execution, clearance, and/or custody services, will be eligible only for the following load waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in a fund's prospectus or SAI.

**Front-end sales load waivers on Class A shares available at Raymond James:**

* Shares purchased in an investment advisory program.

* Shares purchased within the same fund family through a systematic reinvestment of capital gains and dividend distributions.

* Employees and registered representatives of Raymond James or its affiliates and their family members as designated by Raymond James.

* Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (known as Rights of Reinstatement).

* A shareholder in the fund's Class C shares will have their shares converted at NAV to Class A shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of Raymond James.

**CDSC Waivers on Classes A, B and C shares available at Raymond James:**

* Death or disability of the shareholder.

* Shares sold as part of a systematic withdrawal plan as described in the fund's prospectus.

* Return of excess contributions from an IRA Account.

* Shares sold as part of a required minimum distribution for IRA and retirement accounts due to the shareholder reaching the qualified age based on applicable IRS regulations as described in the fund's prospectus.

* Shares sold to pay Raymond James fees but only if the transaction is initiated by Raymond James.

* Shares acquired through a right of reinstatement.

**Front-end load discounts available at Raymond James: breakpoints, rights of accumulation, and/or letters of intent:**

* Breakpoints as described in this prospectus.

* Rights of accumulation which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser's household at Raymond James. Eligible fund family assets not held at Raymond James may be included in the calculation of rights of accumulation only if the shareholder notifies his or her financial advisor about such assets.

* Letters of intent which allow for breakpoint discounts based on anticipated purchases within a fund family, over a 13-month time period. Eligible fund family assets not held at Raymond James may be included in the calculation of letters of intent only if the shareholder notifies his or her financial advisor about such assets.

<u>Robert W. Baird & Co. (Baird)</u>

Shareholders purchasing fund shares through a Baird platform or account will only be eligible for the following sales charge waivers (front-end sales charge waivers and CDSC waivers) and discounts, which may differ from those disclosed elsewhere in this prospectus or the SAI.

**Front-End Sales Charge Waivers on A-shares Available at Baird:**

* Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund

* Shares purchased by employees and registered representatives of Baird or its affiliate and their family members as designated by Baird

* Shares purchased from the proceeds of redemptions from a fund of the fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occur in the same accounts, and (3) redeemed shares were subject to a front-end or deferred sales charge (known as rights of reinstatement)

* A shareholder in a fund's C Shares will have their shares converted at NAV to A shares of the fund if the shares are no longer subject to CDSC and the conversion is in line with the policies and procedures of Baird

* Employer-sponsored retirement plans or charitable accounts in a transactional brokerage account at Baird, including 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans and defined benefit plans. For purposes of this provision, employer-sponsored retirement plans do not include SEP IRAs, Simple IRAs or SAR-SEPs 

**CDSC Waivers on A and C shares Available at Baird:**

* Shares sold due to death or disability of the shareholder 

* Shares sold as part of a systematic withdrawal plan as described in a fund's prospectus

* Shares sold due to returns of excess contributions from an IRA Account

* Shares sold as part of a required minimum distribution for IRA and retirement accounts if the redemption is taken in or after the year the shareholder reaches qualified age based on applicable IRS regulations

* Shares sold to pay Baird fees but only if the transaction is initiated by Baird

* Shares acquired through a right of reinstatement

**Front-End Sales Charge Discounts Available at Baird: Breakpoints and/or Rights of Accumulations:** 

* Breakpoints as described in this prospectus

* Rights of accumulation which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of Fidelity Advisor® funds held by accounts within the purchaser's household at Baird. Eligible Fidelity Advisor® funds not held at Baird may be included in the rights of accumulations calculation only if the shareholder notifies his or her financial advisor about such assets

* Letters of Intent (LOI) allow for breakpoint discounts based on anticipated purchases of Fidelity Advisor® funds through Baird, over a 13-month period of time 

<u>Stifel, Nicolaus & Company, Incorporated (Stifel)</u>

**Front-end Sales Load Waiver on Class A Shares:**

Shareholders who purchase fund shares through a Stifel platform or account or who own shares for which Stifel or an affiliate is the broker-dealer of record and who are invested in Class C shares will have their shares converted at NAV to Class A shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of Stifel.

<u>US Bancorp Investments, Inc. (USBI)</u> 

**Front-end Sales Load Waiver on Class A Shares:** 

Shareholders who purchase fund shares through a USBI platform or account or who own shares for which USBI or an affiliate is the broker-dealer of record, including shares in an omnibus account, and who are invested in Class C shares will have their shares converted at NAV to Class A shares (or the appropriate share class) of the fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of USBI.

&nbsp;&nbsp; **IMPORTANT INFORMATION ABOUT OPENING A NEW ACCOUNT** <br> To help the government fight the funding of terrorism and money laundering activities, the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA PATRIOT ACT), requires all financial institutions to obtain, verify, and record information that identifies each person or entity that opens an account.<br> **For individual investors opening an account:** When you open an account, you will be asked for your name, address, date of birth, and other information that will allow Fidelity to identify you. You may also be asked to provide documents that may help to establish your identity, such as your driver's license.<br> **For investors other than individuals:** When you open an account, you will be asked for the name of the entity, its principal place of business and taxpayer identification number (TIN). You will be asked to provide information about the entity's control person and beneficial owners, and person(s) with authority over the account, including name, address, date of birth and social security number. You may also be asked to provide documents, such as drivers' licenses, articles of incorporation, trust instruments or partnership agreements and other information that will help Fidelity identify the entity. <br>

You can obtain additional information about the fund. A description of the fund's policies and procedures for disclosing its holdings is available in its Statement of Additional Information (SAI) and on Fidelity's web sites. The SAI also includes more detailed information about the fund and its investments. The [SAI](https://www.sec.gov/Archives/edgar/data/35315/000003531522000862/filing5039.htm) is incorporated herein by reference (legally forms a part of the prospectus). The fund's annual and semi-annual reports also include additional information. The fund's annual report includes a discussion of the fund's holdings and recent market conditions and the fund's investment strategies that affected performance.

For a free copy of any of these documents or to request other information or ask questions about the fund, call Fidelity at 1-877-208-0098. In addition, you may visit Fidelity's web site at institutional.fidelity.com for a free copy of a prospectus, SAI, or annual or semi-annual report or to request other information.

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|:---|
| &nbsp;&nbsp; The SAI, the fund's annual and semi-annual reports and other related materials are available from the Electronic Data Gathering, Analysis, and Retrieval (EDGAR) Database on the SEC's web site (http://www.sec.gov). You can obtain copies of this information, after paying a duplicating fee, by sending a request by e-mail to publicinfo@sec.gov or by writing the Public Reference Section of the SEC, Washington, D.C. 20549-1520. You can also review and copy information about the fund, including the fund's SAI, at the SEC's Public Reference Room in Washington, D.C. Call 1-202-551-8090 for information on the operation of the SEC's Public Reference Room.  |
| &nbsp;&nbsp; *Investment Company Act of 1940, File Number(s), 811-02105*  |

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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.

1.9904905.102 ASLD-PRO-0423-102

**Supplement to the**

**Fidelity® Sustainable Low Duration Bond Fund**

**October 29, 2022**

**STATEMENT OF ADDITIONAL INFORMATION**

*Effective April 1, 2023, FMR reduced the fund's management fee. The following information replaces similar information found in the "Management Contracts" section.*

**<u>Management Fee.</u>**

For the services of Fidelity Management & Research Company LLC (FMR) under the management contract, the fund pays FMR a monthly management fee at the annual rate of 0.20% of the fund's average net assets throughout the month.

SLD-SSTK-0423-100-1.9909568.100 April 1, 2023

**Supplement to the**

**Fidelity® Sustainable Low Duration Bond Fund**

**Class A, Class M, Class C, Class I and Class Z**

**October 29, 2022**

**STATEMENT OF ADDITIONAL INFORMATION**

*Effective April 1, 2023, FMR reduced the fund's management fee. The following information replaces similar information found in the "Management Contracts" section.*

**<u>Management Fee.</u>**

For the services of Fidelity Management & Research Company LLC (FMR) under the management contract, the fund pays FMR a monthly management fee at the annual rate of 0.20% of the fund's average net assets throughout the month.

ASLD-SSTK-0423-100-1.9909560.100 April 1, 2023