Underfolio

Every trading day › 1971

The stock market on March 23, 1971

March 23, 1971, a Tuesday. The S&P 500 fell 0.34% to close at 100.28. Of 2,305 US stocks that traded, 712 rose and 1,153 fell.

The S&P 500-0.34%closed at 100.28
How big a move#15,655of 24,799 trading days since 1928
$100 in the index since$7,683price only, to September 24, 2026
Stocks that rose712of 2,305; 1,153 fell
Biggest companyInternational Business Machines Corporationby market value that day

Biggest rises among the 500 largest companies

Heinz (HNZ)+4.0%
Electronic Data Systems (EDS.)+3.9%
United Technologies (UTX)+3.9%

Biggest falls among the 500 largest companies

Maytag (MYG)-5.0%
Pitney Bowes (PBI)-4.6%
Ual Corp. (UAL)-3.6%

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

‹ March 22, 1971 · Every March 23 · March 24, 1971 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.