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

Palantir Technologies (PLTR) advanced by 5.3% pre-bell, following a 4.1% rise from the previous session. Palantir Technologies reported higher Q2 adjusted earnings and revenue, and raised its 2025 revenue guidance.

Opendoor Technologies (OPEN) was 3.3% higher hours before market open, following a 17.1% increase at Monday's close.

American Eagle Outfitters (AEO) rose by 2.5% in premarket hours, after a 23.7% rise from Monday's session.

Advanced Micro Devices (AMD) was up 1.7% in pre-bell hours, following a 3% rise from Monday's session.

Amazon.com (AMZN) advanced by 0.7% premarket, swinging from a 1.4% fall at Monday's close.

Nvidia (NVDA) was 0.5% higher pre-bell, after closing Monday with a 3.6% rise.

Hims & Hers Health (HIMS) fell by 13.2% in premarket activity, reversing a 1.3% increase from the previous session.

UnitedHealth Group (UNH) was down 0.1% premarket, swinging from a 1.4% increase at Monday's close.