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Happy Friday. This is TheStreet’s Stock Market Today for Sept. 19, 2025. You can follow the latest updates on the market here in our daily live blog.
That’s a wrap. The major averages moved higher and hit record intraday highs and record closes.
The Standard & Poor’s 500 Index added 0.5% to 6,672. The Nasdaq Composite Index rose 0.7% to 22,631, and the Dow Jones industrials ended the day up 0.4% to 46,315.
The small-cap Russell 2000 slipped 0.8% to 2,449 after hitting a 52-week high of 2,472 at the open. But the index was up 2.18% on the week, trailing only the Nasdaq and Nasdaq-100 indices on weekly performance.
For the year, the Nasdaq and Nasdaq-100 are up 17.2%. The S&P 500 is up 13.31%. The Russell’s gain is 9.83%, while the Dow is the laggard up 8.86%.
Technology and utility stocks led the S&P 500 on Friday. The weakest of the 11 sectors in the index was energy shares.
Smaller companies like Oklo (OKLO) , which aims to build small nuclear electric plants, and quantum computing company Rigetti Computing (RGTI) shot higher in the session.
Oklo was up 28.8% to $135.23 and up 537% in 2025, even though has no revenue, much less earnings. What it does have is an idea: to take spent nuclear fuel and use it in small facilities that generate electricity for customers with specific demands like data centers.
Rigetti, up 15.3% on the day and 87% on the year, is developing a quantum computer that doesn’t depend on classical circuitry but a sub-atomic technology that can do calculations at many times faster than the fastest computers now.
The technologies may not be ready for market until at least the end of the decade. But that hasn’t dampened speculative enthusiasm.
But speculative technologies sometimes can’t prove out. So, investors beware.
With the stocks nearing the close, the bulls are buying. The major stock indexes are headed to record closes after hitting 52-week highs earlier in the session.
The Standard & Poor’s 500 Index was up 0,4% to 6,662. The Nasdaq Composite Index had risen 0.5% to 22,590, and the Dow Jones Industrial Average was up 0.4% to 46,328.
The Russell 2000 Index hit a 52-week high of 2,472 right at the open but has slipped ever since. Nonetheless, the index, up 2.2% on the week, has outperformed the major indexes.