Could it ride its recent stock market rally all the way to a $1 trillion valuation? Let's dig in and see. A green stock chart on a black background. Image source: Getty Images.

On Black Monday, the stock market opened with an imbalance of demand. More stocks were being sold than bought. The market ended up trading 604.33 million shares, three times the daily average.

On Black Monday, the stock market opened with an imbalance of demand. More stocks were being sold than bought. The market ended up trading 604.33 million shares, three times the daily average.

This instability recalls past crises, like the Black Monday 1987 stock market crash. Black Monday saw a 20.5% S&P 500 drop, the most drastic in financial history.

Photographs purporting to authentically depict stock traders' reactions to the historic Oct. 19, 1987, stock market crash known as "Black Monday" circulated online in April 2025.

Also in the top 10 are both Black Monday and Black Tuesday — the stock market crash that marked the beginning of the Great Depression in 1929. At the close of both days, ...