Underfolio

Every trading day › 2025

The stock market on December 31, 2025

December 31, 2025, a Wednesday. The S&P 500 fell 0.74% to close at 6845.50. Of 3,517 US stocks that traded, 955 rose and 2,447 fell.

The S&P 500-0.74%closed at 6845.50
How big a move#8,819of 24,799 trading days since 1928
$100 in the index since$113price only, to September 24, 2026
Stocks that rose955of 3,517; 2,447 fell
Biggest companyNvidiaby market value that day

Biggest rises among the 500 largest companies

Nike, Inc. (NKE)+4.1%
Guardant Health Inc (GH)+1.5%
Bridgebio Pharma Inc (BBIO)+1.3%

Biggest falls among the 500 largest companies

Fair Isaac (FICO)-3.2%
Universal Health Services (UHS)-3.1%
Applovin (APP)-2.9%

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

‹ December 30, 2025 · Every December 31 · January 2, 2026 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.