OptiNose (OPTN) shares soared 58% pre-bell Thursday after the company said overnight it agreed to a $330 million takeover by Paratek Pharmaceuticals.
ProAssurance (PRA) shares surged 49% after the company said late Wednesday it has agreed to be acquired by The Doctors Company for about $1.3 billion.
Anteris Technologies' (AVR) stock was up 12% following a 1.7% loss in the previous session.