Stock Market Today: S&P 500 and Nasdaq are up in tech-fueled rally as Nvidia's stock jumps after its earnings beat expectations; Dow rises as Salesforce shares surge and Jackson Hole symposium gets started; Marvell Technology results on tap - MarketWatch

The S&P 500, Nasdaq and Dow were rising Thursday afternoon as tech rallied after earnings reports from Nvidia and Salesforce. Traders also were assessing the latest weekly jobless claims data while lo...