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

Strategy (MSTR) rose by 3.5% premarket, after closing Thursday with a 1.5% increase.

MP Materials (MP) advanced by 3.4% in pre-bell activity, following a 50.6% increase at Thursday's close. The company said it entered into a public-private partnership with the US Department of Defense to accelerate the creation of a US rare earth magnet supply chain.

UnitedHealth Group (UNH) was up 0.3% in premarket hours, swinging from a 1.1% decline from the previous session.

Robinhood Markets (HOOD) fell by 1.6% in pre-bell hours, swinging from a 4.4% increase at Thursday's close.

Nvidia (NVDA) declined by 0.8% premarket, reversing a 0.8% increase at Thursday's close.

Advanced Micro Devices (AMD) was 0.6% lower in pre-bell activity, following a 4.2% rise from the previous session.

Alphabet (GOOG) declined by 0.6% premarket, reversing a 0.6% rise from the previous session.

Tesla (TSLA) was down 0.4% hours before market open, swinging from a 4.7% increase from the previous session.