# EDGAR Filing Document

**Accession Number:** 0001527599
**File Stem:** 9999999995-25-002691
**Filing Date:** 2025-8
**Character Count:** 1345
**Document Hash:** ee0a0c74086b35391031bf6d8992eb46
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-25-002691.hdr.sgml**: 20250821

**ACCESSION NUMBER**: 9999999995-25-002691

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250820

**DATE AS OF CHANGE**: 20250821

**EFFECTIVENESS DATE**: 20250820

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SYNLOGIC, INC.
- **CENTRAL INDEX KEY:** 0001527599
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 261824804
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-289415
- **FILM NUMBER:** 251238270

**BUSINESS ADDRESS:**
- **STREET 1:** PO BOX 30
- **CITY:** WINCHESTER
- **STATE:** MA
- **ZIP:** 01890
- **BUSINESS PHONE:** 617-659-2802

**MAIL ADDRESS:**
- **STREET 1:** PO BOX 30
- **CITY:** WINCHESTER
- **STATE:** MA
- **ZIP:** 01890

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Mirna Therapeutics, Inc.
- **DATE OF NAME CHANGE:** 20110809

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** August 20, 2025

**Time:** 16:01:00

**Form Type:** S-3

---

**CIK:** 0001527599

**Company Name:** SYNLOGIC, INC.

**File Number:** 333-289415