Underfolio

Every trading day › 2026

The stock market on September 16, 2026

September 16, 2026, a Wednesday. The S&P 500 fell 0.45% to close at 7551.81. Of 3,329 US stocks that traded, 1,141 rose and 2,061 fell.

The S&P 500-0.45%closed at 7551.81
How big a move#13,437of 24,799 trading days since 1928
$100 in the index since$102price only, to September 24, 2026
Stocks that rose1,141of 3,329; 2,061 fell
Biggest companyNvidiaby market value that day

Biggest rises among the 500 largest companies

Semtech Corp (SMTC)+11.0%
Lumentum Holdings Inc (LITE)+9.6%
Coherent, Inc. (COHR)+6.9%

Biggest falls among the 500 largest companies

J.B. Hunt (JBHT)-13.3%
ON Semiconductor (ON)-9.0%
Diamondback Energy (FANG)-8.0%

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

‹ September 15, 2026 · Every September 16 · September 17, 2026 ›

Ask the Lab what came after a day like this

History, not advice. How these numbers are made.