Underfolio

Every trading day › 1987

The stock market on August 31, 1987

August 31, 1987, a Monday. The S&P 500 rose 0.84% to close at 329.80. Of 6,338 US stocks that traded, 2,294 rose and 1,740 fell.

The S&P 500+0.84%closed at 329.80
How big a move#7,520of 24,799 trading days since 1928
$100 in the index since$2,336price only, to September 24, 2026
Stocks that rose2,294of 6,338; 1,740 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

Newmont Mining (NEM)+11.5%
Alexander/Baldwn (ALEX)+6.7%
Delhaize America Inc+6.7%

Biggest falls among the 500 largest companies

New York Times (NYT)-3.9%
Reynolds Metals (RLM)-3.7%
PepsiCo (PEP)-3.1%

Stock moves count dividends; the index is price only. Market values after 2024 are estimates.

‹ August 28, 1987 · Every August 31 · September 1, 1987 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.