07:41 AM EST, 11/13/2025 (MT Newswires) -- Mersana Therapeutics ( MRSN ) stock was up more than three-fold pre-bell Thursday after the company agreed to be acquired by Day One Biopharmaceuticals (DAWN) in a deal worth $285 million.

Sealed Air ( SEE ) shares were 21% higher after The Wall Street Journal reported late Wednesday that the company is in discussions for a potential takeover by Clayton Dubilier & Rice.

Firefly Aerospace ( FLY ) stock was up 21%, a day after the company posted improved Q3 financial results and lifted 2025 revenue guidance.

Lulu's Fashion Lounge (LVLU) shares were 20% higher after the company reported late Wednesday a narrower Q3 loss.