Underfolio

Every trading day › 2026

The stock market on September 18, 2026

September 18, 2026, a Friday. The S&P 500 rose 0.17% to close at 7650.50. Of 3,326 US stocks that traded, 1,241 rose and 1,982 fell.

The S&P 500+0.17%closed at 7650.50
How big a move#19,981of 24,799 trading days since 1928
$100 in the index since$101price only, to September 24, 2026
Stocks that rose1,241of 3,326; 1,982 fell
Biggest companyNvidiaby market value that day

Biggest rises among the 500 largest companies

Microstrategy Inc (MSTR)+16.4%
Coinbase Global (COIN)+11.7%
Robinhood (HOOD)+9.1%

Biggest falls among the 500 largest companies

Nucor (NUE)-6.3%
Qualcomm (QCOM)-5.8%
Bloom Energy Corp (BE)-5.4%

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

‹ September 17, 2026 · Every September 18 · September 21, 2026 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.