Underfolio

Every trading day › 1981

The stock market on August 12, 1981

August 12, 1981, a Wednesday. The S&P 500 fell 0.34% to close at 133.40. Of 4,963 US stocks that traded, 1,500 rose and 1,496 fell.

The S&P 500-0.34%closed at 133.40
How big a move#15,695of 24,799 trading days since 1928
$100 in the index since$5,775price only, to September 24, 2026
Stocks that rose1,500of 4,963; 1,496 fell
Biggest companyAT&T Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

Husky Oil Ltd (HYO)+10.5%
Cities Service Co+7.2%
Ual Corp. (UAL)+7.0%

Biggest falls among the 500 largest companies

Computervision Corp (CVN)-5.9%
Milacron (MZIAQ)-4.8%
Amax Inc. (AMX)-4.3%

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

‹ August 11, 1981 · Every August 12 · August 13, 1981 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.