While the S&P 500 was first introduced in 1923, it was not until 1957 that the stock market index was formally recognized: therefore, some of the following records may not be known by sources.^[1]

The two tables below show the largest one-day changes between the previous trading day's close and the close of the given trading day in terms of points.^[3]

* Year has not yet ended.

• S&P 500
• List of largest daily changes in the Dow Jones Industrial Average
• List of largest daily changes in the Nasdaq Composite
• List of largest daily changes in the Russell 2000