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

Starbucks (SBUX) rose by 4.8% in pre-bell activity, reversing a 0.8% decline from the previous session.

UnitedHealth Group (UNH) was up 1.3% in premarket hours, swinging from a 7.5% fall at Tuesday's close.

Nvidia (NVDA) advanced by 0.3% pre-bell, following a 0.7% decline at Tuesday's close.

Tesla (TSLA) was 0.3% higher premarket, swinging from a 1.4% decline at Tuesday's close.

SoFi Technologies (SOFI) fell by 7.4% hours before market open, reversing a 6.6% increase from the previous session. SoFi Technologies priced a public offering of about 71.9 million common shares at $20.85 each, for roughly $1.5 billion in expected gross proceeds.

Opendoor Technologies (OPEN) was 1% lower in pre-bell hours, after closing Tuesday with a 12.4% fall.

Novo Nordisk (NVO) was down 3.6% premarket, following a 21.8% fall from the previous session. Novo Nordisk reported Q2 earnings of 5.96 Danish krone ($0.92) per diluted share. Analysts polled by FactSet expected 6.04 Danish krone per share.

Advanced Micro Devices (AMD) declined by 1.3% pre-bell, swinging from a 2.2% increase at Tuesday's close.