Social Buzz: Wallstreetbets Stocks Advance Premarket Monday; Nebius Group, Sandisk to Open Higher

06:33 AM EDT, 10/19/2026 (MT Newswires) -- The most-talked-about stocks in the Reddit subforum Wallstreetbets were advancing hours before Monday's opening bell. Nebius Group (NBIS) was nearly 4% higher in pre-bell activity, following a 12.2% decline at Friday's close. Sandisk (SNDK) was up. 3.8% in premarket hours, after a 6.9% decline from Friday's session. Advanced Micro Devices (AMD) rose by 3% hours before market open, after closing Friday nearly 6% lower. Micron Technology (MU) advanced by 2.8% premarket, swinging from a 5.6% fall from the previous session. Western Digital (WDC) advanced by 2.3% pre-bell, swinging from a 6.9% decline at Friday's close. AST SpaceMobile (ASTS) was 1.8% higher in premarket activity, following an 8.6% fall at Friday's close. CoreWeave (CRWV) was up 1.7% pre-bell, after an 11.9% decline from Friday's session. Nvidia (NVDA) rose by 1.3% in premarket hours, swinging from a 1.4% fall at Friday's close.