Sage Therapeutics (SAGE) shares surged nearly 38% in recent Monday premarket activity after it said late Friday Biogen (BIIB) had submitted an unsolicited, nonbinding proposal to acquire all outstanding shares of the company not already owned for $7.22 a share.

Intra-Cellular Therapies (ITCI) stock rose nearly 35% after it signed a definitive deal to be acquired by Johnson & Johnson (JNJ) for $132 per share in cash for a total equity value of about $14.6 billion, the companies said Monday.

Pediatrix Medical Group (MD) shares rose nearly 16% after saying it appointed Executive Chair Mark Ordan as chief executive officer, effective immediately.

Molecular Partners (MOLN) stock jumped 22%, after it expanded its strategic partnership with Orano Med to include the development of an additional six targeted alpha radio-therapies for cancer, the companies said Sunday.