Acelyrin (NASDAQ:SLRN) received an unsolicited acquisition offer from Concentra Biosciences, controlled by Tang Capital Partners. The proposal includes a cash payment of $3.00 per share, along with a contingent value right (CVR) that entitles shareholders to 80% of the net proceeds from any future out-licensing or sale of Acelyrin's development

On February 6, 2025, ACELYRIN announced an agreement to merge with Alumis Inc. (Nasdaq: ALMS) in an all-stock transaction. The transaction is expected to close in the second quarter of 2025, subject to approval by the stockholders of both companies and satisfaction of other customary closing conditions.

Shares of Acelyrin climbed after the company said it has received an unsolicited indication of interest from Concentra Biosciences for an acquisition at $3 a share. The stock was up 14% at $2.48 in premarket trading. Shares had fallen 31% year to date when the market closed Thursday.