What was the name of the 1929 U.S. stock-market crash’s first panic-selling day?

Black Thursday was the name given to the first major panic-selling day of the 1929 U.S. stock-market crash.

Black Thursday occurred on 24 October 1929, when unusually heavy selling hit the New York Stock Exchange. The Dow Jones Industrial Average fell sharply, but a group of leading bankers bought shares in an attempt to restore confidence and stabilize prices by the end of the session.

The respite did not last. Selling intensified on Black Monday, 28 October, and Black Tuesday, 29 October. Those later sessions produced even larger declines and made the crash a defining symbol of the economic crisis that followed.

The event is sometimes described as beginning on Black Tuesday because that date is more famous. Black Thursday is historically important because it marks the first panic day in the sequence, not because it produced the largest loss of the week.