Stock movers: Nvidia's surge, Salesforce jump, and cybersecurity gains ahead of Thursday

The S&P 500 closed nearly flat Wednesday as investors awaited Nvidia's earnings, with the chipmaker's stock surging over 4% after hours following better-than-expected results. Revenue more than doubled last quarter, and guidance also exceeded forecasts. Nvidia CEO Jensen Huang told CNBC's Jim Cramer that demand is "super strong but incredibly it is accelerating," adding that a lack of computing power is holding back growth. Salesforce also jumped 13% after hours on solid earnings, with CEO Marc Benioff dismissing the "SaaS-pocalypse" theory. Boston Scientific fell 3.4% after a reported cyberattack disrupted global operations. Looking ahead to Thursday, cybersecurity stocks broadly rose, with CrowdStrike gaining 10% after hours on strong results and SentinelOne scheduled to report earnings. Several Canadian banks, including CIBC and Royal Bank of Canada, are set to report during morning trading.