Mercury General (MCY) shares were down 39% pre-bell Friday following a 6.5% fall in the previous session.
22nd Century Group (XXII) stock was 30% lower, erasing Thursday's gains.
Avadel Pharmaceuticals (AVDL) shares were down 25% following a 1.6% loss in the previous session.
Enviri (NVRI) stock was 16% lower following a muted session.