It was all about Nvidia's earnings, and how the market would react to them, and... well, it left a bit to be desired.
After initially spiking as high as $128 on blowout Q2 earnings, NVDA then dumped instantly as the market was disappointed with the company's Q3 guidance, before staging a modest rebound into the Thursday premarket, only to see the gains then fade, and slide more than 6%, and wiping out $200 billion in market cap.