Underfolio

Every trading day › 2026

The stock market on March 31, 2026

March 31, 2026, a Tuesday. The S&P 500 rose 2.91% to close at 6528.52. Of 3,455 US stocks that traded, 2,767 rose and 592 fell.

The S&P 500+2.91%closed at 6528.52
How big a move#723of 24,799 trading days since 1928
$100 in the index since$118price only, to September 24, 2026
Stocks that rose2,767of 3,455; 592 fell
Biggest companyNvidiaby market value that day

Biggest rises among the 500 largest companies

Bloom Energy Corp (BE)+13.4%
Marvell Technology Group Ltd (MRVL)+12.8%
AST SpaceMobile, Inc. (ASTS)+12.3%

Biggest falls among the 500 largest companies

Constellation Energy (CEG)-6.5%
Marion Labs (MKC)-6.1%
Cf Industries Holdings Inc (CF)-5.6%

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

‹ March 30, 2026 · Every March 31 · April 1, 2026 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.