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

POET Technologies (POET) fell by 3% pre-bell, continuing from a 47.4% decrease at the previous session.

Microsoft (MSFT) was down 0.5% premarket, swinging from a 0.1% increase at Monday's close.

Nvidia (NVDA) was 1.6% lower pre-bell, after a 4% increase from the previous session.

Sandisk (SNDK) declined by 2.4% in premarket activity, after closing Monday with an 8.1% rise.

Advanced Micro Devices (AMD) was down 3.5% hours before market open, following a 3.8% decline at Monday's close.

Tesla (TSLA) was down 1.3% premarket, following a 0.6% increase at Monday's close.

Micron Technology (MU) was 2.6% lower pre-bell, partially reversing the 5.6% increase from the previous session.

Bucking the trend, Avis Budget Group (CAR) advanced by 0.02% in pre-bell hours, after a decline of 8.3% from Monday's session.