Wall Street’s main indexes fell Friday as investors assessed a Federal Reserve rate hike, changing oil prices, rising Treasury yields and the quarterly expiration of stock and index derivatives known as triple witching (simultaneous options and futures expiry). Nine of the 11 major S&P 500 sector indexes declined, led by a 1.3% drop in materials. The Dow fell 0.36%, the S&P 500 slipped 0.10% and the Nasdaq eased 0.02% at 11:29 a.m. ET. Markets also reconsidered AI demand after industry executives called for slower development, while next week’s meeting between US President Donald Trump and Chinese President Xi Jinping in Washington is expected to keep the technology race in focus. Analysts cited concerns about an earnings bubble but said S&P 500 earnings growth was more likely to decelerate than collapse. Crude prices fluctuated after fresh strikes between Saudi Arabia and Yemen’s Iran-backed Houthis, while the 10-year Treasury yield rose 5.3 basis points to 5%. Xenon Pharmaceuticals dropped more than 29% after pausing enrollment in trials of an experimental treatment for major and bipolar depression following reports of side effects. Berkshire Hathaway said Warren Buffett would immediately leave his chairman role and become chairman emeritus. Semiconductor shares gained, while Coinbase, Strategy and Robinhood rose 10%, 12% and 8%, respectively, as bitcoin moved above $80,000.