The stock market on September 17, 1986
September 17, 1986, a Wednesday. The S&P 500 fell 0.02% to close at 231.68. Of 5,950 US stocks that traded, 2,229 rose and 1,571 fell.
The S&P 500-0.02%closed at 231.68
How big a move#24,157of 24,799 trading days since 1928
$100 in the index since$3,325price only, to September 24, 2026
Stocks that rose2,229of 5,950; 1,571 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for2stocks
Biggest rises among the 500 largest companies
| CMS Energy (CMS) | +19.5% |
| Marathon Oil (MRO) | +10.1% |
| Tyson Foods (TSN) | +8.9% |
Biggest falls among the 500 largest companies
| Entergy (ETR) | -8.4% |
| Dreyfus Corp (DRY) | -4.3% |
| Enron (ENRNQ) | -3.5% |
Stock moves count dividends; the index is price only. Market values after 2024 are estimates.
‹ September 16, 1986 · Every September 17 · September 18, 1986 ›
Ask the Lab what came after a day like thisHistory, not advice. How these numbers are made.