S&P 500 Gains and Losses Today: Nvidia Leads Chip, AI Stocks Lower

Market Overview - Major U.S. equities indexes experienced declines as investors reacted to new tariff announcements and a drop in Nvidia shares, which fell 8.5% despite solid earnings [1] - The S&P 500 decreased by 1.6%, while the Nasdaq fell 2.8% due to weakness in technology stocks, and the Dow Jones Industrial Average ended 0.5% lower [2] Company-Specific Developments - Teleflex (TFX) shares dropped 21.7% after announcing plans to split into two companies [2] - Super Micro Computer (SMCI) fell 16% following reports of two officers filing to sell shares, alongside a delayed annual report [3] - Viatris (VTRS) stock declined by 15.2% due to weaker-than-expected earnings and a disappointing outlook, impacted by regulatory actions affecting profits [3] - Vistra Corp. (VST) shares decreased by 12.3% despite better-than-expected earnings, as other AI-related stocks also lost ground [4] - Invitation Homes (INVH) stock rose by 5.5% after reporting quarterly revenue and net income that exceeded analyst estimates [5] - Warner Bros. Discovery (WBD) shares increased by 4.7% after reporting weaker-than-expected earnings but providing a positive streaming outlook [6] - Allstate (ALL) shares rose 3.5% following the announcement of a dividend increase and a $1.5 billion share buyback program [6] - Universal Health Services (UHS) saw a 3.3% increase in shares after reporting better-than-expected earnings and a positive revenue outlook [7]