Underfolio

Every trading day › 1988

The stock market on October 17, 1988

October 17, 1988, a Monday. The S&P 500 rose 0.33% to close at 276.41. Of 6,141 US stocks that traded, 1,761 rose and 1,792 fell.

The S&P 500+0.33%closed at 276.41
How big a move#15,838of 24,799 trading days since 1928
$100 in the index since$2,787price only, to September 24, 2026
Stocks that rose1,761of 6,141; 1,792 fell
Biggest companyInternational Business Machines Corporationby market value that day

Biggest rises among the 500 largest companies

Gap, Inc. (The) (GPS)+4.7%
West Point Pepperell (WPM)+4.1%
Mead (MEA)+3.1%

Biggest falls among the 500 largest companies

Chemical Waste Management (CHW)-5.2%
Unisys (UIS)-4.6%
Baxter International (BAX)-4.1%

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

‹ October 14, 1988 · Every October 17 · October 18, 1988 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.