# EDGAR Filing Document

**Accession Number:** 0001562565
**File Stem:** 0001562565-23-000009
**Filing Date:** 2023-3
**Character Count:** 7469
**Document Hash:** 397f3d1ad273dae325b249c14e6626df
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001562565-23-000009.hdr.sgml**: 20230331

**ACCESSION NUMBER**: 0001562565-23-000009

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 26

**FILED AS OF DATE**: 20230331

**DATE AS OF CHANGE**: 20230331

**EFFECTIVENESS DATE**: 20230331

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Fidelity Merrimack Street Trust
- **CENTRAL INDEX KEY:** 0001562565
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0831

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-186372
- **FILM NUMBER:** 23786883

**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

## Series and Classes Contracts Data

### Fidelity Limited Term Bond ETF (Series ID: S000042569)

---

|  |  |  |
|:---|:---|:---|
| Class Name                     | Ticker Symbol | Class ID   |
| Fidelity Limited Term Bond ETF | FLTB          | C000131661 |

---

### Fidelity Sustainable Low Duration Bond ETF (Series ID: S000075901)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                 | Ticker Symbol | Class ID   |
| Fidelity Sustainable Low Duration Bond ETF | FSLD          | C000235242 |

---

## Series and Classes Contracts Data

### Fidelity Limited Term Bond ETF (Series ID: S000042569)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000131661 | Fidelity Limited Term Bond ETF | FLTB            |

### Fidelity Sustainable Low Duration Bond ETF (Series ID: S000075901)

| Class ID   | Class Name                                 | Ticker Symbol   |
|:---|:---|:---|
| C000235242 | Fidelity Sustainable Low Duration Bond ETF | FSLD            |

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

**Supplement to the Fidelity® Corporate Bond ETF, Fidelity® Investment Grade Bond ETF, Fidelity® Investment Grade Securitized ETF, Fidelity® Limited Term Bond ETF, and Fidelity® Total Bond ETF December 30, 2022 Prospectus**

Effective April 1, 2023, FMR reduced Fidelity® Limited Term Bond ETF's management fee. The following information replaces similar information for Fidelity® Limited Term Bond ETF 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; 0.25 %  |
| Distribution and/or Service (12b-1) fees  |  |
| Other expenses  | &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**  | &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.

---

| | |
|:---|:---|
| 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; 80  |
| 5 years  | $&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; 318  |

---

The following information replaces similar information for Fidelity® Limited Term Bond ETF 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® Limited Term Bond ETF  | 0.25%  |

---

FIXETF-PSTK-0423-104 1.9887760.104 April 1, 2023

**Supplement to the Fidelity® Sustainable Low Duration Bond ETF December 30, 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  | &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**  | &nbsp;&nbsp;&nbsp;&nbsp;&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.

---

| | |
|:---|:---|
| 1 year  | $&nbsp;&nbsp;&nbsp;&nbsp;&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;&nbsp;&nbsp;&nbsp;&nbsp; 64  |

---

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 ETF  | 0.20%  |

---

LDB-PSTK-0423-100 1.9909564.100 April 1, 2023

**Supplement to the**

**Fidelity® Sustainable Low Duration Bond ETF**

**December 30, 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. The management fee paid to FMR by the fund is reduced by an amount equal to the fees and expenses paid by the fund to the Independent Trustees.

LDB-SSTK-0423-100-1.9909565.100 April 1, 2023

**Supplement to the**

**Fidelity® Limited Term Bond ETF**

**December 30, 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 0.25% of the fund's average net assets throughout the month. The management fee paid to FMR by the fund is reduced by an amount equal to the fees and expenses paid by the fund to the Independent Trustees.

T13-SSTK-0423-104-1.9862951.104 April 1, 2023