Underfolio

Every trading day › 1988

The stock market on September 20, 1988

September 20, 1988, a Tuesday. The S&P 500 rose 0.34% to close at 269.73. Of 6,157 US stocks that traded, 1,829 rose and 1,792 fell.

The S&P 500+0.34%closed at 269.73
How big a move#15,639of 24,799 trading days since 1928
$100 in the index since$2,856price only, to September 24, 2026
Stocks that rose1,829of 6,157; 1,792 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

Maytag (MYG)+7.1%
Kroger (KR)+6.9%
Navistar International (NAV)+5.0%

Biggest falls among the 500 largest companies

Time Warner (TWX)-8.8%
Reebok International (RBK)-5.6%
Honeywell (HON.Z)-4.5%

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

‹ September 19, 1988 · Every September 20 · September 21, 1988 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.