Underfolio

Every trading day › 1981

The stock market on May 18, 1981

May 18, 1981, a Monday. The S&P 500 rose 0.28% to close at 132.54. Of 4,833 US stocks that traded, 1,623 rose and 1,406 fell.

The S&P 500+0.28%closed at 132.54
How big a move#17,003of 24,799 trading days since 1928
$100 in the index since$5,813price only, to September 24, 2026
Stocks that rose1,623of 4,833; 1,406 fell
Biggest companyAT&T Corporationby market value that day

Biggest rises among the 500 largest companies

Humana (HUM)+7.8%
Tandem Computers Inc (TDM.)+6.9%
Freeport-McMoran (FTX)+6.7%

Biggest falls among the 500 largest companies

Tom Brown Inc (TMBR)-5.1%
MCI Communications (MCIC.)-4.7%
Honeywell International (HON)-4.3%

Stock moves count dividends; the index is price only. Market values after 2024 are estimates.

‹ May 15, 1981 · Every May 18 · May 19, 1981 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.