Sensex crash today: BSE Sensex fell 1,092 points to 74,775.74 and Nifty 50 dropped 359 points to 23,547.75 on May 29, 2026. Investors lost Rs 6 lakh crore. 6 reasons: US-Iran talks, crude above $104, MSCI selling, FII outflows, F&O expiry and rupee weakness. Full analysis on Univest.