# EDGAR Filing Document

**Accession Number:** 0001562565
**File Stem:** 0000878467-23-000038
**Filing Date:** 2023-3
**Character Count:** 1927
**Document Hash:** 2d490bb55fbf6ff756d8835ad250b846
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000878467-23-000038.hdr.sgml**: 20230331

**ACCESSION NUMBER**: 0000878467-23-000038

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**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:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-186372
- **FILM NUMBER:** 23785324

**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 Sustainable Low Duration Bond ETF (Series ID: S000075901)

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

**Supplement to the**

**Fidelity® Sustainable Low Duration Bond ETF**

**December 30, 2022**

**Summary 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> | 0.20% |
| Distribution and/or Service (12b-1) fees |  |
| Other expenses | 0.00% |
| **Total annual operating expenses** | 0.20% |

---

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

---

| | |
|:---|:---|
| 1 year | $20 |
| 3 years | $64 |

---

LDB-SUSTK-0423-100 1.9909566.100 April 1, 2023