The stock market on September 20, 1985
September 20, 1985, a Friday. The S&P 500 fell 0.73% to close at 182.05. Of 5,714 US stocks that traded, 1,728 rose and 1,733 fell.
The S&P 500-0.73%closed at 182.05
How big a move#8,883of 24,799 trading days since 1928
$100 in the index since$4,232price only, to September 24, 2026
Stocks that rose1,728of 5,714; 1,733 fell
Biggest companyInternational Business Machines Corporationby market value that day
Biggest rises among the 500 largest companies
| Shared Medical Systems (SMS) | +7.3% |
| TRW Inc. (TRW) | +6.7% |
| Multimedia Inc (MMEDC) | +4.9% |
Biggest falls among the 500 largest companies
| Allied Bancshares Inc-Tx (ALBN) | -7.0% |
| M G M U A Entertainment (MGM) | -6.6% |
| Northwest Airlines (NWA) | -5.8% |
Stock moves count dividends; the index is price only. Market values after 2024 are estimates.
‹ September 19, 1985 · Every September 20 · September 23, 1985 ›
Ask the Lab what came after a day like thisHistory, not advice. How these numbers are made.