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

Nebius Group (NBIS) was down 7.1% premarket, after a 1.6% decline from the previous session.

Advanced Micro Devices (AMD) was 5.45% lower pre-bell, reversing a 2.5% increase from Friday's session.

Sandisk (SNDK) declined by 5.2% in premarket activity, following a 3.5% fall at Friday's close.

Micron Technology (MU) was 5.2% lower in pre-bell hours, after a 4.9% fall from the previous session

Oracle (ORCL) fell 3.5% premarket, reversing a marginal increase at Friday's close. Oracle said its Executive Chair and Chief Technology Officer Larry Ellison has canceled his plan to sell the company's shares.

Nvidia (NVDA) was 3% lower hours before market open, following a slight decline from Friday's session.

Alamos Gold (AGI) was down 2.6% pre-bell, offsetting a 0.7% increase at Friday's close.

Reddit (RDDT) declined by 1.1% premarket, swinging from a 1.6% increase at Friday's close.