Underfolio

Every trading day › 1977

The stock market on October 20, 1977

October 20, 1977, a Thursday. The S&P 500 rose 0.31% to close at 92.67. Of 4,639 US stocks that traded, 1,082 rose and 1,237 fell.

The S&P 500+0.31%closed at 92.67
How big a move#16,222of 24,799 trading days since 1928
$100 in the index since$8,314price only, to September 24, 2026
Stocks that rose1,082of 4,639; 1,237 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

Pabst Brewing (PABT)+15.2%
Gardner Denver (GDC)+6.0%
Becton Dickinson (BDX)+5.8%

Biggest falls among the 500 largest companies

FMC Corporation (FMC)-7.0%
Mallinckrodt Inc -old (MALL.)-3.8%
Nlt Corp (NLT)-3.7%

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

‹ October 19, 1977 · Every October 20 · October 21, 1977 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.