Underfolio

Every trading day › 1987

The stock market on July 17, 1987

July 17, 1987, a Friday. The S&P 500 rose 0.60% to close at 314.59. Of 6,287 US stocks that traded, 2,229 rose and 1,709 fell.

The S&P 500+0.60%closed at 314.59
How big a move#10,682of 24,799 trading days since 1928
$100 in the index since$2,449price only, to September 24, 2026
Stocks that rose2,229of 6,287; 1,709 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

KeySpan (KSE)+14.7%
Mca Inc. (MCA)+8.5%
Dole Food (DOLE)+7.6%

Biggest falls among the 500 largest companies

CMS Energy (CMS)-8.1%
Home Shopping Network-5.9%
Intergraph Corp (INGR.)-3.4%

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

‹ July 16, 1987 · Every July 17 · July 20, 1987 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.