---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-024891"
form_type: "8-K"
ticker: "SYBX"
cik: "0001527599"
company_name: "SYNLOGIC, INC."
filed_at: "2025-02-21T23:59:59+00:00"
generated_at: "2026-05-26T06:54:24.278058+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Synlogic Director Michael Heffernan Resigns from Board and Committees

## Summary
- Michael Heffernan resigned from the Synlogic board and its audit and nominating/governance committees on February 20, 2025.
- The resignation was voluntary and not due to any disagreement with the company's operations, policies, or practices.
- Heffernan's departure is effective immediately, reducing the board's committee membership.
- Synlogic (SYBX) disclosed the change in a Form 8-K filed on February 21, 2025.

## SEC filing metadata
- accession: 0000950170-25-024891
- form_type: 8-K
- ticker: SYBX
- cik: 0001527599
- company_name: SYNLOGIC, INC.
- filed_at: 2025-02-21T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1527599/000095017025024891/0000950170-25-024891-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1527599/000095017025024891/sybx-20250220.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-024891
- JSON: https://secwatch.observer/filing/0000950170-25-024891.json
- Plain text: https://secwatch.observer/filing/0000950170-25-024891.txt

## Key facts
- Executive change
  Michael Heffernan resigned as member of the board of directors at SYNLOGIC, INC..
  - Action: resigned
  - Role: member of the board of directors
  source text: On February 20, 2025, Michael Heffernan tendered his resignation as a member of the board of directors (the “Board”) of Synlogic, Inc. (the “Company”) and as a member of the audit committee and nominating and governance committee of the Board, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1527599/000095017025024891/0000950170-25-024891-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.