Stock Market Today: Dow Rises Ahead of 'Economic D-Day'; Micron, Sandisk Dive (Live Coverage)
US stock indexes closed higher on August 21, 2026, though the Dow, S&P 500, and Nasdaq all recorded losses for the week. Treasury yields trended upward while investors focused on bond yields and tensions involving Iran. Market volatility persists as traders anticipate Nvidia earnings and the Jackson Hole symposium. While the Dow rose during the session, shares of Micron and Sandisk experienced sharp declines.
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- ✓ US indexes closed higher on August 21, 2026.
- ✓ The Dow, S&P 500, and Nasdaq posted losses for the week.
- ✓ Treasury yields moved upward.
What changed
US indexes closed higher on August 21 but finished the week with overall losses.
Live updates
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Dow Rises as US Indexes Post Weekly Losses
US stock indexes closed higher on August 21, 2026, though the Dow, S&P 500, and Nasdaq all recorded losses for the week. Treasury yields trended upward while investors focused on bond yields and tensions involving Iran. Market volatility persists as traders anticipate Nvidia earnings and the Jackson Hole symposium. While the Dow rose during the session, shares of Micron and Sandisk experienced sharp declines.
Why it matters
The market is reacting to a combination of geopolitical instability and upcoming economic catalysts. Investors are weighing the impact of federal policy signals from Jackson Hole against corporate performance in the semiconductor sector.
What is confirmed
- US indexes closed higher on August 21, 2026.
- The Dow, S&P 500, and Nasdaq posted losses for the week.
- Treasury yields moved upward.
Still unconfirmed
- Micron and Sandisk shares dived.
- Wall Street is focusing on Iran.
What to watch next
- Nvidia earnings report
- Jackson Hole symposium outcomes
confidence 90%Sources used for this update (5)
- The New York Times — Stocks and Bonds Steady at the End of a Tumultuous Week
- Reuters — Wall St rises on the day but falls for the week; bond yields and Iran in focus
- Investopedia — Markets News, Aug. 21, 2026: US Indexes Close Higher But Post Weekly Losses; Treasury Yields Edge Upward
- MarketWatch — Stock Market Today: Dow, S&P 500 and Nasdaq set to fall ahead of Nvidia earnings and Jackson Hole
- Investor's Business Daily — Stock Market Today: Dow Rises Ahead of 'Economic D-Day'; Micron, Sandisk Dive (Live Coverage)
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