RF Acquisition (RFAI) stock was down 31% premarket Monday following a 335% rise in the previous session.

ZeroStack (ZSTK) shares were more than 14% lower, extending the previous session's 20% decline.

AMC Robotics (AMCI) stock was down more than 13% after the company announced on Friday an agreement allowing certain investors to exercise warrants at a reduced price, with the proceeds intended to raise up to $2.1 million for its Vietnam facility.

JX Luxventure Group (JXG) shares were 7% lower, compared with the 17% rise in the prior session.

Applied Optoelectronics (AAOI) stock was down 13% after the company filed a $600 million at-the-market equity distribution agreement on Friday.