S&P/TSX Falls 0.85% as Tech, Materials, Energy Stocks Slide

The S&P/TSX Composite Index dropped 217.34 points, or 0.85%, to 25,251.15 on Monday, September 28, 2026, pressured by sharp declines in technology, materials, and energy sectors. The Information Technology Capped Index fell more than 3.5%, led by Celestica Inc. (CLS.TO), which plunged nearly 26% on concerns over China's low-cost AI startup DeepSeek and its potential impact on AI sector earnings and growth. Bitfarms (BITF.TO) dropped 12.8%, while Converge Technology (CTS.TO), BlackBerry (BB.TO), and Descartes Systems (DSG.TO) each lost 2% to 3.4%. Weak commodity prices dragged materials and energy shares lower. Enerflex (EFX.TO) and Terravest Capital (TVK.TO) fell 6% and 5.2%, respectively. First Majestic Silver (AG.TO), Ivanhoe Mines (IVN.TO), and First Quantum Minerals (FM.TO) lost 4% to 6.2%. Investors await monetary policy decisions this week from the Bank of Canada, Federal Reserve, and European Central Bank.