---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-010169"
form_type: "8-K"
ticker: "ALMS"
cik: "0001847367"
company_name: "ALUMIS INC."
filed_at: "2025-02-06T23:59:59+00:00"
generated_at: "2026-05-27T01:48:57.188947+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Alumis to acquire ACELYRIN in all-stock merger; exchange ratio 0.4274

## Summary
- Alumis to acquire ACELYRIN via merger; each ACELYRIN share converted into 0.4274 Alumis shares.
- Stock options with exercise price ≤$18.00 converted to Alumis options at adjusted strike; options >$18.00 cancelled for no consideration.
- Termination fees of $10M each; close targeted by July 7, 2025, subject to stockholder approvals and regulatory conditions.
- Alumis reports preliminary cash, equivalents and marketable securities of ~$289M as of Dec 31, 2024.
- Voting agreements cover ~24% of ACELYRIN shares and ~62% of Alumis shares; stockholders commit to vote for merger.

## SEC filing metadata
- accession: 0001104659-25-010169
- form_type: 8-K
- ticker: ALMS
- cik: 0001847367
- company_name: ALUMIS INC.
- filed_at: 2025-02-06T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 2.02, 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1847367/000110465925010169/0001104659-25-010169-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1847367/000110465925010169/tm254989d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-010169
- JSON: https://secwatch.observer/filing/0001104659-25-010169.json
- Plain text: https://secwatch.observer/filing/0001104659-25-010169.txt

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