Real Messenger (RMSG) shares were down 25% pre-bell Friday, erasing Thursday's gains.
Achieve Life Sciences (ACHV) shares were down nearly 15% premarket after the company said late Thursday it priced a $45 million public offering of securities.
Phoenix Asia (PHOE) shares were down 14%, extending Thursday's slide.
Ascent Solar Technologies (ASTI) stock was down 13%, shaving some of the gains from the previous session.