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

Palantir Technologies (PLTR) rose by 16.9% pre-bell, after a 2% rise at Monday's close. The company reported overnight a Q2 beat and raised its 2026 revenue guidance.

Advanced Micro Devices (AMD) was 3.6% higher in premarket hours, following a 1.8% increase from Monday's session.

Micron Technology (MU) advanced by 3.3% premarket, after a 0.8% increase from the previous session.

Sandisk (SNDK) was up 3.1% in pre-bell activity, following a 6% rise from Monday's session.

SpaceX (SPCX) was 1.5% higher hours before market open, after closing Monday with a 5.7% increase.

Nvidia (NVDA) rose by 0.9% pre-bell, following a 2.9% increase from the previous session.

Reddit (RDDT) declined by 2.3% in pre-bell activity, after a 10% rise from Monday's session.

Microsoft (MSFT) was down 1.4% in premarket hours, swinging from a 4.9% increase at Monday's close.