Vivakor (VIVK) shares were down 31% in Wednesday premarket trading after the company said it will effect a 1-for-20 reverse stock split at the market open on July 17.
CN Energy Group (CNEY) stock was down 24%, following the previous session's 56% gain.
Pentair (PNR) shares were down almost 22% after the company lowered its full-year outlook and reported preliminary Q2 results that missed market estimates.
NextCure (NXTC) stock was down nearly 22% after Tuesday's 201% rally.