The extension of the Iran peace deal deadline by President Trump has led to a significant rebound in stock markets. The Dow Jones Industrial Average, S&P 500, and Nasdaq Composite all posted substantial gains, with the Dow jumping over 600 points. The S&P/TSX Composite index in Canada saw the largest percentage gain of approximately 1.8%. The rebound began in pre-market trading on March 26, 2026, immediately after the deadline extension was announced, with U.S. equity futures rising by approximately 0.3%. According to Carol Schleif, chief market strategist at BMO Private Wealth, the de-escalation of tensions is giving markets an optimistic tone.