---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-251548"
form_type: "8-K"
ticker: "MCRB"
cik: "0001609809"
company_name: "Seres Therapeutics, Inc."
filed_at: "2026-06-01T20:30:55+00:00"
generated_at: "2026-06-01T20:41:08.884469+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.25
calibrated_materiality_score: 0.25
confidence: "high"
source: SEC EDGAR
---

# Seres Therapeutics board member Hans-Juergen Woerle resigns, effective May 31, 2026

## Summary
- Dr. Woerle resigned from the board and all committees, effective May 31, 2026.
- Departure is not due to any disagreement with Seres' operations, policies, or practices.
- No replacement or additional board changes were announced.

## SEC filing metadata
- accession: 0001193125-26-251548
- form_type: 8-K
- ticker: MCRB
- cik: 0001609809
- company_name: Seres Therapeutics, Inc.
- filed_at: 2026-06-01T20:30:55+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.25
- calibrated_materiality_score: 0.25
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1609809/000119312526251548/0001193125-26-251548-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1609809/000119312526251548/d100982d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-251548
- JSON: https://secwatch.observer/filing/0001193125-26-251548.json
- Plain text: https://secwatch.observer/filing/0001193125-26-251548.txt

## Source-grounded claims
- claim_id: 6e160d3aaa
  claim: Hans-Juergen Woerle resigned as member of the board of directors at Seres Therapeutics, Inc..
  evidence_excerpt: On May 30, 2026, Hans-Juergen Woerle, M.D., Ph.D. resigned from his position as a member of the board of directors of Seres Therapeutics, Inc. (the “Company”) and on the committees on which he serves, effective May 31, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1609809/000119312526251548/0001193125-26-251548-index.htm

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