The stock market on December 18, 2025
December 18, 2025, a Thursday. The S&P 500 rose 0.79% to close at 6774.76. Of 3,523 US stocks that traded, 1,993 rose and 1,415 fell.
The S&P 500+0.79%closed at 6774.76
How big a move#8,110of 24,799 trading days since 1928
$100 in the index since$114price only, to September 24, 2026
Stocks that rose1,993of 3,523; 1,415 fell
Biggest companyNvidiaby market value that day
Biggest rises among the 500 largest companies
| Rivian (RIVN) | +15.0% |
| Rocket Lab USA (RKLB) | +11.1% |
| Micron Technology (MU) | +10.2% |
Biggest falls among the 500 largest companies
| Insmed Inc (INSM) | -16.1% |
| Diamondback Energy (FANG) | -4.6% |
| HP Inc. (HPQ) | -4.0% |
Stock moves count dividends; the index is price only. Market values after 2024 are estimates.
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Ask the Lab what came after a day like thisHistory, not advice. How these numbers are made.