---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-245646"
form_type: "8-K"
ticker: "SYBX"
cik: "0001527599"
company_name: "SYNLOGIC, INC."
filed_at: "2023-09-28T23:59:59+00:00"
generated_at: "2026-06-10T07:36:44.842703+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Synlogic implements 1-for-15 reverse stock split effective Sep 27, 2023 to meet Nasdaq bid price rule

## Summary
- Reverse stock split at 1:15 ratio effective 5:00 PM ET on Sep 27, 2023; shares outstanding reduce from ~69M to ~4.6M.
- Split approved by shareholders at Sep 21 special meeting; no change in authorized shares, par value $0.001.
- No fractional shares; cash in lieu based on Sep 27 closing price.
- Stock continues on Nasdaq under symbol SYBX; new CUSIP 87166L209.
- Primary goal: regain compliance with Nasdaq minimum $1.00 bid price requirement.

## SEC filing metadata
- accession: 0001193125-23-245646
- form_type: 8-K
- ticker: SYBX
- cik: 0001527599
- company_name: SYNLOGIC, INC.
- filed_at: 2023-09-28T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1527599/000119312523245646/0001193125-23-245646-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1527599/000119312523245646/d556575d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-245646
- JSON: https://secwatch.observer/filing/0001193125-23-245646.json
- Plain text: https://secwatch.observer/filing/0001193125-23-245646.txt

## Key facts
- Governance Changes
  SYNLOGIC, INC.: Reverse stock split of common stock at a ratio of 1-for-15 via Certificate of Amendment to Amended and Restated Certificate of Incorporation (effective 2023-09-27).
  - Change: charter amendment
  - Effective: 2023-09-27
  source text: On September 27, 2023, the Company filed with the Secretary of State of the State of Delaware the Certificate of Amendment to effect a one-time reverse stock split of the Company’s common stock, at a ratio of 1-for-15 (the “Reverse Stock Split”). The Reverse Stock Split was effective at 5:00 p.m. Eastern Time, after the close of trading on The Nasdaq Capital Market, on September 27, 2023
  evidence_url: https://www.sec.gov/Archives/edgar/data/1527599/000119312523245646/0001193125-23-245646-index.htm

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