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

AST SpaceMobile (ASTS) declined by 13.2% in premarket hours, following a 3.9% fall from the previous session. AST SpaceMobile reported a Q3 net loss of $1.10 per diluted share, widening from a loss of $0.23 a year ago.

Oklo (OKLO) fell by 6.6% pre-bell, reversing a 3.5% increase at Thursday's close. Oklo (OKLO) said it has signed a letter of intent to acquire Atomic Alchemy for $25 million in an all-stock transaction.

Intuitive Machines (LUNR) was down 4.5% premarket, extending losses after a 13% decline from Thursday's session. Intuitive Machines reported a Q3 net loss attributable to the company of $55.4 million, swinging from net income of $33.3 million a year earlier.

Rocket Lab USA (RKLB) was 1.9% lower in pre-bell activity, after closing Thursday with a 7.8% fall.

General Motors (GM) was down 0.5% hours before market open, following a 0.2% decline from the previous session.

Nvidia (NVDA) fell by 0.4% in premarket hours, swinging from a 0.3% increase at Thursday's close.

Super Micro Computer (SMCI) advanced by 1.6% in pre-bell hours, swinging from an 11.4% decline at Thursday's close.

Tesla (TSLA) was up 0.7% premarket, swinging from a 5.8% fall at Thursday's close.