Underfolio

Every trading day › 1991

The stock market on September 23, 1991

September 23, 1991, a Monday. The S&P 500 fell 0.52% to close at 385.92. Of 5,735 US stocks that traded, 1,493 rose and 2,117 fell.

The S&P 500-0.52%closed at 385.92
How big a move#12,201of 24,799 trading days since 1928
$100 in the index since$1,996price only, to September 24, 2026
Stocks that rose1,493of 5,735; 2,117 fell
Biggest companyExxon Mobilby market value that day
Last day of trading for1stock

Biggest rises among the 500 largest companies

Hercules (HPC)+5.1%
Tenet Healthcare (THC)+4.5%
Homestake Mining (HM)+3.4%

Biggest falls among the 500 largest companies

Centocor Inc (CNTO.)-5.9%
Bethlehem Steel-5.6%
Lowe's (LOW)-5.1%

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

‹ September 20, 1991 · Every September 23 · September 24, 1991 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.