The stock market on May 18, 1971
May 18, 1971, a Tuesday. The S&P 500 rose 0.14% to close at 100.83. Of 2,320 US stocks that traded, 830 rose and 1,054 fell.
The S&P 500+0.14%closed at 100.83
How big a move#20,724of 24,799 trading days since 1928
$100 in the index since$7,641price only, to September 24, 2026
Stocks that rose830of 2,320; 1,054 fell
Biggest companyInternational Business Machines Corporationby market value that day
Biggest rises among the 500 largest companies
| Allegheny Energy (AYE) | +5.7% |
| H&R Block (HRB) | +5.0% |
| Quaker State (KSF) | +4.9% |
Biggest falls among the 500 largest companies
| Lucky Stores (LKS) | -8.2% |
| W.R. Grace & Co. (GRA) | -4.9% |
| Hercules (HPC) | -4.8% |
Stock moves count dividends; the index is price only. Market values after 2024 are estimates.
‹ May 17, 1971 · Every May 18 · May 19, 1971 ›
Ask the Lab what came after a day like thisHistory, not advice. How these numbers are made.