Alumis prices public offering of 17.65M shares at $17/sh for ~$345M gross; prelim cash $308.6M

ALUMIS INC.

Public offering of 17,650,000 shares at $17.00 per share; gross proceeds ~$345.1 million.
Underwriters' option fully exercised on Jan 8, 2026 for additional 2,647,500 shares.
Preliminary unaudited cash, equivalents and marketable securities as of Dec 31, 2025: ~$308.6 million.
Closing expected Jan 9, 2026; led by Morgan Stanley, Leerink Partners and Cantor Fitzgerald.

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