Nvidia shares' 9% recovery Tuesday was the second-best day in terms of market cap added for any company ever, trailing only a record it set in July.

Nvidia was last higher by about 7% on Tuesday, with the rally gaining steam throughout the session. The stock at one point shortly after the open was in the red. That bounce comes

Shares of semiconductor makers were dropping early Monday as a Chinese AI model triggered questions over their lofty valuations.