US equity indices closed mixed on Thursday, as tech volatility gripped trading ahead of the holiday, despite easing concerns over rate hikes. The S&P 500 was flat and the Nasdaq 100 fell 0.8%. Chipmaker stocks fell for a second day as investors questioned whether AI optimism had pushed valuations beyond reasonable levels. Fresh developments included reports that OpenAI was in talks to sell a 5% stake to the U.S. government, while Meta (-4.9%) said it may monetize its excess compute capacity. Micron Technology sank 7%, Applied Materials slipped 7.4%, and Advanced Micro Devices dropped 4.3%. SanDisk (-14%) and Marvell (-9.8%) tanked. Tesla fell 7.5% despite a strong deliveries report. Still, the Dow climbed 595 points to a new record high amid strength in traditional sectors. A softer-than-expected jobs report for June pushed back expectations of an imminent Fed hike. Apple gained 4.8%, while Visa and Walmart rose over 2%.