# EDGAR Filing Document

**Accession Number:** 0001562565
**File Stem:** 0001562565-25-000225
**Filing Date:** 2025-12
**Character Count:** 1393
**Document Hash:** 92b1f56912d1ca936552aff3401fbfcf
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001562565-25-000225.hdr.sgml**: 20251212

**ACCESSION NUMBER**: 0001562565-25-000225

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251212

**DATE AS OF CHANGE**: 20251212

**EFFECTIVENESS DATE**: 20251212

**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:** 251566777

**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 ETF (Series ID: S000084018)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000248144 | Fidelity Low Duration Bond ETF | FLDB            |

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

*Effective on or about March 31, 2026, Julian Potenza will no longer serve as Co-Portfolio Manager of the fund.*

LOD-SUSTK-1225-101 1.9918236.101 December 12, 2025