---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-246542"
form_type: "8-K"
ticker: "SYBX"
cik: "0001527599"
company_name: "SYNLOGIC, INC."
filed_at: "2023-09-29T23:59:59+00:00"
generated_at: "2026-06-10T06:54:21.471914+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Synlogic raises $21M in public offering, funds PKU Phase 3 and manufacturing

## Summary
- Gross proceeds of $21M from 7.39M shares and 7.39M warrants at $2.84 per unit.
- Proceeds to fund Phase 3 SYNB1934 for PKU, BLA manufacturing, and SYNB1353 for HCU.
- Top-line data for PKU Phase 3 Synpheny-3 study expected first half of 2025.
- Existing cash plus offering expected to fund operations into first half of 2025.
- Participants include New Enterprise Associates and a board member; Chardan underwriter.

## SEC filing metadata
- accession: 0001193125-23-246542
- form_type: 8-K
- ticker: SYBX
- cik: 0001527599
- company_name: SYNLOGIC, INC.
- filed_at: 2023-09-29T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 1.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1527599/000119312523246542/0001193125-23-246542-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1527599/000119312523246542/d741024d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-246542
- JSON: https://secwatch.observer/filing/0001193125-23-246542.json
- Plain text: https://secwatch.observer/filing/0001193125-23-246542.txt

## Key facts
- Material Agreements
  SYNLOGIC, INC. entered into Underwriting Agreement with Chardan Capital Markets, LLC (effective 2023-09-28).
  - Action: entry
  - Agreement: underwriting
  - Counterparty: Chardan Capital Markets, LLC
  - Effective: 2023-09-28
  source text: On September 28, 2023, Synlogic, Inc. (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with Chardan Capital Markets, LLC, as underwriter (the “Underwriter”), pursuant to which the Company agreed to issue and sell 3,921,928 shares of its common stock (the “Shares”), pre-funded warrants to purchase up to 3,472,435 shares of its common stock (the “Pre-Funded Warrants”) and accompanying common stock warrants to purchase up to 7,394,363 shares of its common stock (the “Purchase Warrants”) to the Underwriter (the “Offering”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1527599/000119312523246542/0001193125-23-246542-index.htm

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