The first major panic day of the 1929 U.S. stock-market crash, known as Black Thursday, occurred on October 24, 1929.
On that Thursday, heavy selling struck the New York Stock Exchange after weeks of declining prices. Trading volume reached a then-record level, and prices fell sharply during the morning session. A group of prominent bankers later attempted to stabilize the market by buying heavily traded shares.
That intervention temporarily calmed investors, but it did not end the underlying decline. Selling intensified again the following week, producing Black Monday on October 28 and Black Tuesday on October 29. The crash continued to damage confidence and contributed to the wider economic contraction that became the Great Depression.
Black Thursday is therefore not the same day as Black Tuesday. Black Thursday refers specifically to October 24, while Black Tuesday refers to October 29, 1929.