U.S. Market Daily: Reference ETFs Decline as Nasdaq Breadth Turns Weak

Market at a glance

The S&P 500-tracking SPY fell 0.46% to $757.39, the Nasdaq-100-tracking QQQ fell 0.65% to $704.54, and the Dow-tracking DIA fell 0.62% to $521.23. Breadth was negative across all three exchanges: the NYSE recorded 878 advancers, 1,810 decliners and 162 unchanged stocks; NYSE American recorded 824 advancers, 3,713 decliners and 167 unchanged; and Nasdaq-listed stocks recorded 1,355 advancers, 3,319 decliners and 563 unchanged.

Market leaders

Micron Technology (MU) closed at $927.60, up 0.39%, with $18.96 billion in turnover and 20.43 million shares traded. Its five-day change was -7.26%. Nvidia (NVDA) closed at $212.17, up 0.57%, with $18.68 billion in turnover and 88.06 million shares traded. NVDA's five-day change was -5.90%.

Issue stocks

CrowdStrike Holdings (CRWD) rose 3.02% to $242.49, with $4.18 billion in turnover and volume at 1.52 times its 20-day average; its five-day change was 15.46%. Western Digital (WDC) fell 3.51% to $411.96, with $3.24 billion in turnover and volume at 1.32 times its 20-day average; its five-day change was -13.69%. Coinbase Global (COIN) fell 10.10% to $172.11, with $3.23 billion in turnover and volume at 1.85 times its 20-day average; its five-day change was -3.82%.

SEC filing noted

Western Digital Corp submitted an 8-K filing dated September 14, 2026, with a report date of September 13, 2026. The filing lists Items 7.01, 8.01 and 9.01. Filing URL: View SEC filing

Next Trading Day Checkpoints

• Check whether the negative advancer-decliner balance persists across the NYSE, NYSE American and Nasdaq-listed stocks.
• Monitor follow-through in CRWD after its 15.46% five-day rise and in WDC and COIN after their recent declines.
• Track SPY, QQQ and DIA as market-reference ETFs in the next completed U.S. trading session.

This article reports the supplied market data and filing metadata for September 15, 2026. It is not investment advice.