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

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.

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.