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

Sandisk (SNDK) advanced by 3% in premarket activity, after closing Monday with a 2.5% increase.

Nvidia (NVDA) was 0.4% higher pre-bell, following a 0.9% increase at Monday's close.

Microsoft (MSFT) was up 0.2% premarket, swinging from a 3.2% decline from the previous session.

International Business Machines (IBM) was flat in pre-bell hours, swinging from a 13.2% fall from the previous session.

Hims & Hers Health (HIMS) fell by nearly 7% hours before market open, following a 0.8% decline from Monday's session. Hims & Hers Health reported a decline in Q4 earnings.

Novo Nordisk (NVO) was down 2.4% in pre-bell activity, after a 16.4% fall from the previous session.

Robinhood Markets (HOOD) declined by 0.9% premarket, after closing Monday with a 5.7% fall.

Tesla (TSLA) was 0.7% lower premarket, following a 2.9% decline from Monday's session.