Autonomix Medical (AMIX) stock was down more than 41% premarket Wednesday after a 434% rise at the previous close.
The Marygold (MGLD) shares were more than 33% lower, extending the nearly 6% loss from the prior session.
China SXT Pharmaceuticals (SXTC) stock was down more than 31%, partially reversing the 60% rise at the previous close.
Vivos Therapeutics (VVOS) shares were 30% lower pre-bell following a nearly 10% rise at Tuesday's close.
Tigo Energy (TYGO) stock was down 25%, a day after the company posted Q2 financial results.