Nasdaq-Listed Breadth Positive as QQQ Gains; Micron and Sandisk Lead Turnover
On September 22, 2026, the S&P 500-tracking SPY slipped 0.02%, the Nasdaq-100-tracking QQQ rose 0.81%, and the Dow-tracking DIA fell 0.34%. Breadth was positive on Nasdaq and American Stock Exchange listings, while New York Stock Exchange breadth was slightly negative. Micron Technology and Sandisk ranked among the highest-turnover selected stocks.
Market at a glance
SPY closed at $773.38, down 0.02%, on $26.92 billion in turnover. QQQ closed at $747.46, up 0.81%, on $29.99 billion in turnover. DIA closed at $518.00, down 0.34%, on $1.75 billion in turnover.
On the New York Stock Exchange, 1,298 stocks advanced, 1,367 declined and 181 were unchanged. On the American Stock Exchange, 2,838 advanced, 1,620 declined and 241 were unchanged. On Nasdaq-listed stocks, 2,755 advanced, 1,899 declined and 593 were unchanged.
Market leaders
Micron Technology (MU), a Nasdaq-listed semiconductor company, closed at $1,096.16, up 5.00% for the day and 18.17% over five trading days. Turnover was $31.997 billion on volume of 29.19 million shares, or 1.16 times its 20-day average volume.
Sandisk (SNDK), a Nasdaq-listed computer-storage company, closed at $1,887.04, up 6.82% for the day and 23.26% over five trading days. Turnover was $24.394 billion on volume of 12.93 million shares, or 1.19 times its 20-day average volume.
Issue stocks
Shopify (SHOP) closed at $147.74, up 7.12% for the day and 13.77% over five trading days. Its volume was 25.47 million shares, 2.99 times its 20-day average, with $3.762 billion in turnover.
Seagate Technology Holdings (STX) closed at $919.84, up 4.85% for the day and 19.18% over five trading days. Volume was 5.27 million shares, 1.43 times its 20-day average, with $4.851 billion in turnover.
AMD closed at $623.77, up 1.34% for the day and 23.71% over five trading days. Volume was 28.28 million shares, 1.38 times its 20-day average, with $17.642 billion in turnover.
SEC filing noted
Sandisk Corp submitted a Form 8-K filing dated September 16, 2026, with report date September 9, 2026. The filing lists Item 5.02. Filing URL: View SEC filing
Next Trading Day Checkpoints
- Watch the next session's moves in the selected high-turnover stocks: MU, SNDK, SHOP, STX and AMD.
- Monitor whether Nasdaq-listed breadth remains positive after 2,755 advancers versus 1,899 decliners on September 22.
- Track the next closes of SPY, QQQ and DIA as market-reference ETFs; direct U.S. index data was not collected.
This article reports the supplied market data and selected stock activity for September 22, 2026. The selected stocks are not recommendations. ETF figures are market-reference data and are not direct index readings.