US stocks mixed as tech drags S&P 500 before Nvidia earnings

US stocks closed mixed Monday as technology and semiconductor declines pressured the S&P 500 and Nasdaq, while the Dow Jones Industrial Average rose. The S&P 500 fell 0.28% to 7,652.96, and the Nasdaq Composite dropped 0.76% to 25,980.19, while the Dow gained 139.98 points, or 0.26%, to 53,416.99. Semiconductor stocks led losses, with Micron Technology down over 5%, Advanced Micro Devices falling 3%, and Broadcom losing 2%. Nvidia also declined ahead of its quarterly earnings report Wednesday, seen as a key test for AI-related investor confidence. Treasury yields fell on reports the US Treasury might fund a bond-buyback operation, with the 10-year yield down over four basis points to 4.69%. Investors await Federal Reserve Chair Kevin Warsh's Jackson Hole speech Friday and July PCE inflation data Wednesday. New threats of tariffs on Canada and expanded sanctions on Iran added geopolitical risks.