Underfolio

Every trading day › 1991

The stock market on March 21, 1991

March 21, 1991, a Thursday. The S&P 500 fell 0.36% to close at 366.58. Of 5,695 US stocks that traded, 1,813 rose and 1,745 fell.

The S&P 500-0.36%closed at 366.58
How big a move#15,117of 24,799 trading days since 1928
$100 in the index since$2,102price only, to September 24, 2026
Stocks that rose1,813of 5,695; 1,745 fell
Biggest companyExxon Mobilby market value that day
Last day of trading for3stocks

Biggest rises among the 500 largest companies

CR Bard (BCR)+7.6%
American Homes 4 Rent (AMH)+7.3%
Aflac (AFL)+6.6%

Biggest falls among the 500 largest companies

Lowe's (LOW)-5.5%
Unocal Corporation (UCL)-4.8%
Scott Paper (SPP)-4.6%

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

‹ March 20, 1991 · Every March 21 · March 22, 1991 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.