---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-051338"
form_type: "8-K"
ticker: "ALMS"
cik: "0001847367"
company_name: "ALUMIS INC."
filed_at: "2025-05-21T23:59:59+00:00"
generated_at: "2026-05-20T22:45:23.500495+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Alumis completes merger with ACELYRIN; cash runway extended into 2027

## Summary
- Each ACELYRIN share exchanged for 0.4814 shares of Alumis common stock; ACELYRIN stock ceased trading.
- Lynn Tetrault appointed to Alumis board; Henry Gosebruch will not join due to new CEO role at Galapagos.
- Combined company cash runway extends into 2027, supporting multiple planned data readouts.
- Martin Babler remains President, CEO, and Chairman of Alumis.

## SEC filing metadata
- accession: 0001104659-25-051338
- form_type: 8-K
- ticker: ALMS
- cik: 0001847367
- company_name: ALUMIS INC.
- filed_at: 2025-05-21T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 2.01, 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1847367/000110465925051338/0001104659-25-051338-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1847367/000110465925051338/tm2515764d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-051338
- JSON: https://secwatch.observer/filing/0001104659-25-051338.json
- Plain text: https://secwatch.observer/filing/0001104659-25-051338.txt

## Key facts
- M&A Transactions
  ALUMIS INC. completed an acquisition involving ACELYRIN, Inc. for 0.4814 shares of voting common stock of Alumis (closed 2025-05-21).
  - Action: acquisition
  - Counterparty: ACELYRIN, Inc.
  - Consideration: 0.4814 shares of voting common stock of Alumis
  - Closing: 2025-05-21
  source text: hich was subsequently amended on April 20, 2025 (the “ Merger Agreement ”) with ACELYRIN, Inc., a Delaware corporation (“ ACELYRIN ”), and Arrow Merger Sub, Inc., a Delaware corporation and a direct wholly owned
  evidence_url: https://www.sec.gov/Archives/edgar/data/1847367/000110465925051338/0001104659-25-051338-index.htm

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