Underfolio

Every trading day › 1983

The stock market on October 18, 1983

October 18, 1983, a Tuesday. The S&P 500 fell 1.54% to close at 167.81. Of 5,437 US stocks that traded, 805 rose and 2,825 fell.

The S&P 500-1.54%closed at 167.81
How big a move#2,931of 24,799 trading days since 1928
$100 in the index since$4,591price only, to September 24, 2026
Stocks that rose805of 5,437; 2,825 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

Mesa Inc (MXP.)+5.8%
Mallinckrodt (MKG)+2.8%
Quaker Oats (OAT.)+2.6%

Biggest falls among the 500 largest companies

Digital Equipment (DEC)-20.9%
Seagate Technology (SEG)-12.2%
MCI Communications (MCIC.)-8.7%

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

‹ October 17, 1983 · Every October 18 · October 19, 1983 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.