Underfolio

Every trading day › 2026

The stock market on March 23, 2026

March 23, 2026, a Monday. The S&P 500 rose 1.15% to close at 6581.00. Of 3,455 US stocks that traded, 2,605 rose and 762 fell.

The S&P 500+1.15%closed at 6581.00
How big a move#4,887of 24,799 trading days since 1928
$100 in the index since$117price only, to September 24, 2026
Stocks that rose2,605of 3,455; 762 fell
Biggest companyNvidiaby market value that day

Biggest rises among the 500 largest companies

Albemarle Corporation (ALB)+6.9%
Astera Labs, Inc. (ALAB)+6.8%
Palantir Technologies (PLTR)+6.7%

Biggest falls among the 500 largest companies

Estée Lauder Companies (The) (EL)-7.7%
Bloom Energy Corp (BE)-5.9%
Fair Isaac (FICO)-5.7%

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

‹ March 20, 2026 · Every March 23 · March 24, 2026 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.