Theriva Biologics (TOVX) shares were up 94% in Monday premarket activity, adding to Friday's gain.

Compass Pathways (CMPS) stock was 25% higher after the company said over the weekend it commended the White House executive order to accelerate research and access for psychedelic treatments.

TopBuild (BLD) shares were up 19%, a day after QXO (QXO) said it agreed to acquire TopBuild for $505 per share in a deal valued at about $17 billion.

Marvell Technology (MRVL) stock was 6.3% higher after The Information reported Sunday that Alphabet's (GOOG, GOOGL) Google is negotiating with Marvell to develop two new processors optimized for artificial intelligence inference tasks.

Eni (E) shares were up 2% after the company said it has made gas discovery in the Kutei Basin off the coast of Indonesia.