Market Overview - The trading day ended with significant declines across major indices, with the S&P 500 down approximately 180 points or 2.7%, marking its worst day since April 10th [7] - The NASDAQ 100 and NASDAQ composite both fell over 3%, also their worst performance since April 10th [7] - The Russell 2000 index dropped more than 74 points or 3% [7] Sector Performance - The technology sector was particularly hard hit, declining about 4%, with semiconductor stocks experiencing notable losses [9] - Consumer staples were the only sector to show positive performance, up about 0.33%, indicating a defensive trade [8][9] - A broad-based sell-off was observed, with 1,425 stocks declining compared to only 78 advancing [8] Company-Specific Movements - MP Materials and USAA, involved in rare earths, saw their stocks rise by 8.5% and 5% respectively, following China's new export curbs [10][11] - Protagonist Therapeutics shares surged nearly 30% after reports of Johnson & Johnson's interest in acquiring the company [13] - Applied Digital's shares increased by over 16% due to positive earnings and advanced talks for a new data center [14] Notable Declines - Levi Strauss experienced a 12% drop, its worst intraday decline since April, after its earnings guidance fell short of expectations [16][17] - Venture Global's stock plummeted nearly 25% following a legal dispute loss with BP, which could have significant financial implications [18] - The VanEck Semiconductor ETF fell almost 6% despite being up 34% year-to-date [19] Economic Context - The market's downturn coincided with concerns over a potential U.S. government shutdown, which has limited the release of economic data [20][27] - Upcoming earnings reports from major banks, including Goldman Sachs and Bank of America, are anticipated to provide insights into consumer spending and economic health [28][29]

The U.S. stock market experienced a dramatic reversal on Friday, October 10, 2025, with major indexes plummeting in afternoon trading after President Donald Trump threatened a "massive increase" in tariffs on Chinese imports. This unexpected escalation of trade tensions shattered a months-long period of relative calm on Wall Street, sending investors scrambling and wiping out earlier modest gains. The downturn was exacerbated by an ongoing U.S. government shutdown, now in its tenth day, which continues to c ...