Underfolio

Every trading day › 1983

The stock market on September 12, 1983

September 12, 1983, a Monday. The S&P 500 fell 0.86% to close at 165.48. Of 5,343 US stocks that traded, 1,476 rose and 1,865 fell.

The S&P 500-0.86%closed at 165.48
How big a move#7,312of 24,799 trading days since 1928
$100 in the index since$4,656price only, to September 24, 2026
Stocks that rose1,476of 5,343; 1,865 fell
Biggest companyInternational Business Machines Corporationby market value that day
Last day of trading for3stocks

Biggest rises among the 500 largest companies

Albertsons (ABS)+6.9%
Georgia-Pacific (GP)+5.3%
Cabot Corporation (CBT)+4.3%

Biggest falls among the 500 largest companies

Merrill Lynch (MER)-11.3%
Salomon-7.8%
Intergraph Corp (INGR.)-6.9%

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

‹ September 9, 1983 · Every September 12 · September 13, 1983 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.