Mainz Biomed (MYNZ) shares fell 18% pre-bell Monday following a 6.6% increase in the previous session.
Forte Biosciences (FBRX) shares dropped 15% following a muted session.
Capstone Holding (CAPS) stock was down 13%, paring gains from Friday.
Lichen International (LICN) shares retreated 12%, cutting Friday's rally.