Sarepta Therapeutics (SRPT) shares were 25% lower pre-bell Friday, erasing Thursday's gains.
BlackSky Technology (BKSY) stock was down 20% after the company priced a $160 million private debt offering.
Volcon (VLCN) shares were 16% lower after rising more than two-fold on Thursday.
Foxx Development (FOXX) stock was down 9%, shaving gains from the previous session.