# EDGAR Filing Document

**Accession Number:** 0001562565
**File Stem:** 0001562565-25-000163
**Filing Date:** 2025-10
**Character Count:** 1502
**Document Hash:** 88154b98a8dfa2c4ae5c3bf855bfefd9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001562565-25-000163.hdr.sgml**: 20251001

**ACCESSION NUMBER**: 0001562565-25-000163

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251001

**DATE AS OF CHANGE**: 20251001

**EFFECTIVENESS DATE**: 20251001

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Fidelity Merrimack Street Trust
- **CENTRAL INDEX KEY:** 0001562565

**ORGANIZATION NAME:**
- **EIN:** 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:** 251362752

**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 Low Duration Bond Factor ETF (Series ID: S000062079)

| Class ID   | Class Name                            | Ticker Symbol   |
|:---|:---|:---|
| C000201028 | Fidelity Low Duration Bond Factor ETF | FLDR            |

**Supplement to the Fidelity® Low Duration Bond Factor ETF December 30, 2024 Summary Prospectus**

The following information supplements information found in the "Fund Summary" section under the "Portfolio Manager(s)" heading.

Van Eswara (Co-Portfolio Manager) has managed the fund since 2025.

LDE-SUSTK-1025-103 1.9900302.103 October 1, 2025