Baird, Oppenheimer, Bernstein, Evercore ISI, William Blair, KeyBanc Capital Markets and Melius Research all moved Nvidia off their buy-equivalent ratings. Huang's resignation and the continued downturn of the firm's stock follows the reports of his affiar withAlice Huang. Nvidia shares fell 8.6%, or $14.95, to $158.78 in extended trading, after closing Wednesday's regular session 2.92% higher at $173.73. At the closing price, the company had a market capitalisation.