Stock Market Today (Aug. 24, 2026): Nasdaq slides on Iran sanctions, U.S.-Canada tariff threats

The Nasdaq and S&P 500 experienced declines on August 24, 2026, as technology stocks sagged. Market volatility was driven by the imposition of sanctions on Iran and escalating tariff threats between the United States and Canada. These downward trends were further exacerbated by the breakdown of official US-Canada talks. Investors reacted negatively to the geopolitical tensions and trade instability, leading to a general slide across major indices during the current trading session.