Among individual movers, SoundHound SOUN rallied 30% after the voice AI platform provider posted a more than 200% leap in second-quarter revenue, to a record $42.7 million. It also raised its full-year midpoint sales outlook to $169 million, up from $167 million. Its loss of 3 cents per share narrowed from the year-earlier quarter.

US stocks retreated on Tuesday as investors digested the latest wave of corporate earnings, economic data, and various tariff updates. Palantir (PLTR) stock jumped roughly 7% after the company's earnings report beat expectations and revealed its revenue had topped $1 billion in a quarter for the first time.