The stock market on September 23, 1985
September 23, 1985, a Monday. The S&P 500 rose 1.24% to close at 184.30. Of 5,707 US stocks that traded, 2,131 rose and 1,341 fell.
The S&P 500+1.24%closed at 184.30
How big a move#4,349of 24,799 trading days since 1928
$100 in the index since$4,180price only, to September 24, 2026
Stocks that rose2,131of 5,707; 1,341 fell
Biggest companyInternational Business Machines Corporationby market value that day
Biggest rises among the 500 largest companies
| American Standard (TT) | +6.5% |
| Caterpillar (CAT) | +6.2% |
| Hercules (HPC) | +5.0% |
Biggest falls among the 500 largest companies
| Hutton (E.F.) Group (EFH) | -3.4% |
| Noram Energy Corp | -3.0% |
| Northwest Airlines (NWA) | -2.4% |
Stock moves count dividends; the index is price only. Market values after 2024 are estimates.
‹ September 20, 1985 · Every September 23 · September 24, 1985 ›
Ask the Lab what came after a day like thisHistory, not advice. How these numbers are made.