The most-talked-about stocks in the Reddit subforum Wallstreetbets were mostly lower hours before Thursday's opening bell.

UnitedHealth Group (UNH) was up 0.7% in pre-bell hours after a 3.6% increase from the previous session.

Meta Platforms (META) was 0.4% higher premarket, swinging from a 2.9% fall at Wednesday's close.

Opendoor Technologies (OPEN) was 1.9% lower pre-bell following an 11% rise from the previous session.

Nebius Group (NBIS) was down 1.1% hours before market open after a 7.7% decline at Wednesday's close.

Oklo (OKLO) was down 0.9% in premarket activity following a 6.7% rise from Wednesday's session.

Advanced Micro Devices (AMD) was 0.9% lower in pre-bell activity, swinging from a 9% rise at Wednesday's close.

Palantir Technologies (PLTR) declined by 0.7% pre-bell after a 3.6% fall from Wednesday's session.

Nvidia (NVDA) was down 0.5% premarket following a 0.3% increase from the previous session.