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

AST SpaceMobile (ASTS) tumbled by 13% premarket, after a 6% decline Friday. The company said the BlueBird 7 satellite was placed into a lower-than-planned orbit during the New Glenn 3 mission and will de-orbited.

Strategy (MSTR) was 2.3% lower pre-bell, after closing the previous session with a roughly 12% jump.

Rocket Lab (RKLB) was down 1.8% hours before market open, following a 2.3% increase from Friday's session.

Nvidia (NVDA) fell by 1.2% in premarket activity, after a 1.7% increase from the previous session.

Microsoft (MSFT) declined by 0.9% pre-bell, swinging from a 0.6% increase at Friday's close.

Tesla (TSLA) was 0.7% lower in premarket hours, following a 3% gain from the previous session.

Antero Midstream (AM) fell by 0.5% in pre-bell activity, following a 0.2% advance from the previous session.

Marvell Technology (MRVL) advanced by 7.7% premarket, after a 4.7% rise from Friday's session. Alphabet's (GOOG, GOOGL) Google is negotiating with Marvell Technology to develop two new processors optimized for artificial intelligence inference tasks, The Information reported Sunday, citing two people with knowledge of the discussions.