The stock market on September 20, 1979
September 20, 1979, a Thursday. The S&P 500 rose 2.06% to close at 110.51. Of 4,506 US stocks that traded, 1,509 rose and 964 fell.
The S&P 500+2.06%closed at 110.51
How big a move#1,575of 24,799 trading days since 1928
$100 in the index since$6,971price only, to September 24, 2026
Stocks that rose1,509of 4,506; 964 fell
Biggest companyInternational Business Machines Corporationby market value that day
Biggest rises among the 500 largest companies
| Columbia Energy Group | +10.6% |
| Houston Oil & Minerals (HOI) | +9.6% |
| Sedco (SED) | +9.4% |
Biggest falls among the 500 largest companies
| Caesars World (CAW) | -4.9% |
| Homestake Mining (HM) | -4.3% |
| W.R. Grace & Co. (GRA) | -3.2% |
Stock moves count dividends; the index is price only. Market values after 2024 are estimates.
‹ September 19, 1979 · Every September 20 · September 21, 1979 ›
Ask the Lab what came after a day like thisHistory, not advice. How these numbers are made.