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

Rocket Lab USA (RKLB) was 3.3% higher premarket, following a 13.1% increase from the previous session. Rocket Lab USA said it agreed to acquire the parent holding company of Geost, a US-based maker of electro-optical and infrared payloads used in national security satellites.

Nvidia (NVDA) was up 0.6% pre-bell, after closing Tuesday with a 3.2% increase.

CoreWeave (CRWV) advanced by 1.4% in premarket hours, following a 20.7% increase at Tuesday's close.

Strategy (MSTR) declined by 1.1% in premarket activity, reversing a 0.7% increase from the previous session.

Reddit (RDDT) was 0.3% lower pre-bell, following a 3.8% increase at Tuesday's close.

UnitedHealth Group (UNH) was flat premarket, after closing Tuesday with a 0.2% decline.

AMC Entertainment Holdings (AMC) was up 0.5% hours before market open, from a 23.8% rise at Tuesday's close.

Tesla (TSLA) rose slightly premarket, following a 6.9% increase at Tuesday's close.