NEW YORK, 21 September 2026 — The Nasdaq Composite closed at a record 27,122.09, rising 599.55 points, or 2.3%, as semiconductor and other artificial-intelligence-linked shares led Monday’s US equity rebound.
US closing scoreboard
| Benchmark | Close | Daily move |
|---|---|---|
| Nasdaq Composite | 27,122.09 | +599.55 / +2.3% |
| S&P 500 | 7,764.70 | +114.20 / +1.5% |
| Dow Jones Industrial Average | 52,048.83 | +366.19 / +0.7% |
| Russell 2000 | 2,875.36 | +14.96 / +0.5% |
Technology led, but breadth was uneven
The Nasdaq’s 2.3% gain was substantially larger than the Dow’s 0.7% advance and the Russell 2000’s 0.5% rise. That spread is useful context: the session was positive across the four cited benchmarks, but the strongest contribution came from technology and chip-related shares rather than an equal move across large industrial and smaller domestic companies.
Advanced Micro Devices gained about 9.95% in the same session, while Nvidia added 2.3%, according to the cited closing report. Those moves help explain the Nasdaq’s relative strength without proving that one stock or one announcement caused the index record.
Oil and yields changed the valuation backdrop
Brent crude fell 3.4% to $100.34 a barrel and the US 10-year Treasury yield eased to 4.95% in the contemporary market report. Lower oil and bond yields can reduce pressure on expected costs and equity valuations, especially for long-duration growth companies. They remain separate markets, however, and the same-day direction does not establish a permanent relationship.
What the record does not guarantee
An index record is a closing measurement, not a forecast. The Nasdaq is weighted by market value, so its largest constituents can have an outsized effect. The comparatively smaller Russell 2000 gain is one reason readers should examine advance-decline breadth, sector participation and equal-weighted measures before describing the session as uniformly strong.
Next confirmation points
The durability test is whether gains broaden in the next cash session while yields and energy prices remain stable. CapKet will treat any later close as a new timestamped record and will not overwrite this September 21 observation.
Data and investment notice: Closing figures are historical market observations sourced from the cited reports and benchmark pages. They are not live executable quotes, investment advice or a prediction of the next session.