---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-039256"
form_type: "8-K"
ticker: "MCRB"
cik: "0001609809"
company_name: "Seres Therapeutics, Inc."
filed_at: "2025-02-27T23:59:59+00:00"
generated_at: "2026-05-26T01:55:50.897482+00:00"
event_type: "leadership"
sentiment: "negative"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Seres Therapeutics CMO Lisa von Moltke resigns effective March 14, 2025

## Summary
- Lisa von Moltke, M.D., notified Seres of her resignation as EVP and Chief Medical Officer.
- Resignation effective March 14, 2025; she accepted a CMO and Head of R&D role at a biopharma.
- No successor named; search process not disclosed.
- Dr. von Moltke's departure is for a role in autoimmune disease therapeutics.

## SEC filing metadata
- accession: 0001193125-25-039256
- form_type: 8-K
- ticker: MCRB
- cik: 0001609809
- company_name: Seres Therapeutics, Inc.
- filed_at: 2025-02-27T23:59:59+00:00
- event_type: leadership
- sentiment: negative
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1609809/000119312525039256/0001193125-25-039256-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1609809/000119312525039256/d928060d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-039256
- JSON: https://secwatch.observer/filing/0001193125-25-039256.json
- Plain text: https://secwatch.observer/filing/0001193125-25-039256.txt

## Source-grounded claims
- claim_id: 59ba546d1a
  claim: Lisa von Moltke resigned as Executive Vice President and Chief Medical Officer at Seres Therapeutics, Inc..
  evidence_excerpt: On February 22, 2025, Lisa von Moltke, M.D. notified Seres Therapeutics, Inc. (the “Company”) of her intention to resign as the Executive Vice President and Chief Medical Officer of the Company, effective as of March 14, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1609809/000119312525039256/0001193125-25-039256-index.htm

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