The stock market on September 20, 1978
September 20, 1978, a Wednesday. The S&P 500 fell 0.78% to close at 101.73. Of 4,548 US stocks that traded, 593 rose and 2,228 fell.
The S&P 500-0.78%closed at 101.73
How big a move#8,239of 24,799 trading days since 1928
$100 in the index since$7,573price only, to September 24, 2026
Stocks that rose593of 4,548; 2,228 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for2stocks
Biggest rises among the 500 largest companies
| Ecolab (ECL) | +5.4% |
| Kennecott (KN) | +4.4% |
| Homestake Mining (HM) | +3.5% |
Biggest falls among the 500 largest companies
| Griffin GAMING&ENTMT (GGE) | -16.1% |
| Bally Entertainment (BLY) | -11.9% |
| Mgm Grand Hotels Inc (GRH) | -8.8% |
Stock moves count dividends; the index is price only. Market values after 2024 are estimates.
‹ September 19, 1978 · Every September 20 · September 21, 1978 ›
Ask the Lab what came after a day like thisHistory, not advice. How these numbers are made.