PRF Technologies (PRFX) shares were down 27% in Tuesday premarket activity, following the previous session's 83% gain.

Cuprina (CUPR) stock was down 25% after a 111% gain in Monday's session.

J-Star (YMAT) shares were down 25% after the company said late Monday it received a Nasdaq delisting determination notice.

Wearable Devices (WLDS) stock was down 20%, following the previous session's 26% gain.

Tianci International (CIIT) shares were down 19%, extending the previous session's nearly 16% decline.