Alumis and ACELYRIN amend merger terms; ACELYRIN stockholders get 48% ownership of combined company

ALUMIS INC.

Exchange ratio revised to 0.4814 Alumis shares per ACELYRIN share, up from original terms; Alumis stockholders own ~52%, ACELYRIN ~48% fully diluted.
Special Meeting of Stockholders for both companies scheduled for May 13, 2025; record date April 1, 2025.
Pro forma cash position of combined company ~$737M as of Dec 31, 2024; runway expected into 2027 for key data readouts.
Stockholders representing ~62% of Alumis and ~24% of ACELYRIN have entered into voting agreements supporting the transaction.
Merger expected to close in Q2 2025, subject to stockholder approvals and customary conditions.

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