Universe Pharmaceuticals (UPC) shares climbed 145% pre-bell after a 9% decline on Friday.
Megan (MGN) stock was 140% higher, extending a nearly 7% gain in the prior session.
Focus Universal (FCUV) shares were up 50%, adding to a 517% rise in the previous session.
Reitar Logtech (RITR) stock was up 31%, recovering from Friday's 9.6% loss.
Atkore (ATKR) shares rose more than 26% after the company said it has entered a definitive agreement to be acquired by Prysmian for $95 per share in an all-cash transaction with an enterprise value of about $3.8 billion.