The most-talked-about stocks in the Reddit subforum Wallstreetbets were advancing hours before Wednesday's opening bell.

CoreWeave (CRWV) advanced by 18.5% premarket, after closing Tuesday with a 2.4% increase. CoreWeave posted a surge in Q2 revenue.

Super Micro Computer (SMCI) rose by 9.1% in pre-bell activity, following a 0.5% increase at Tuesday's close. The company reported higher fiscal Q4 adjusted earnings and revenue, and issued a stronger-than-expected revenue outlook for fiscal 2027.

Nebius Group (NBIS) was 8.9% higher in premarket hours, after a 5% rise from the previous session.

Micron Technology (MU) was up 2.9% hours before market open, after a 0.9% increase from Tuesday's session.

Hertz Global Holdings (HTZ) was 2.8% higher premarket, after a 15.6% rise from the previous session.

Nvidia (NVDA) rose by 1.2% in premarket activity, reversing a slight decline from Tuesday's session.

Rocket Lab (RKLB) was up 0.9% premarket, following a marginal fall from the previous session.

Alphabet (GOOG) advanced by 0.7% pre-bell, swinging from a 3.6% fall at Tuesday's close.