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

SELLAS Life Sciences (SLS) was up 6.9% in pre-bell activity, after a 17.7% rise from Friday's session.

Strategy (MSTR) was 2.2% higher premarket, swinging from a 3.5% decline at Friday's close.

SpaceX (SPCX) rose 2.7% pre-bell, after a 0.2% increase at Friday's close.

Microsoft (MSFT) advanced by 1.4% in premarket hours, following a 5.7% increase from the previous session.

Wendy's (WEN) was up 0.6% hours before market open, after a 6.4% rise from Friday's session.

Ubiquiti (UI) rose by 0.9% pre-bell, after closing Friday with a 2.7% fall.

Nvidia (NVDA) advanced by 1% in pre-bell activity, following a 1.6% decline from the previous session.

Micron Technology (MU) was 1.4% higher premarket, swinging from a 6.7% fall at Friday's close.