NuScale Jumps 13% and Oklo 6.8% as Uranium ETF Adds 4.4%
Small modular reactor developers led a sharp bid back into nuclear names Tuesday, with NuScale up nearly 13% and Oklo up almost 7% while the S&P 500 proxy fell.
NuScale Power (SMR) traded up 12.99% at $10.96 and Oklo (OKLO) up 6.83% at $44.09 on Tuesday, with the Global X Uranium ETF (NYSEARCA: URA) 4.41% higher at $48.09 while the SPDR S&P 500 ETF Trust (NYSEARCA: SPY) slipped 0.27%, according to prices as of 15:15 GMT.
The nuclear complex found buyers on Tuesday morning, and the bid was concentrated exactly where the selling had been heaviest: the small modular reactor developers that have no reactors generating power yet and therefore trade almost entirely on sentiment.
NuScale Power (SMR) changed hands at $10.96, up 12.99% from a prior close of $9.70, as of 15:15 GMT. Oklo (OKLO) traded at $44.09, up 6.83% from $41.27. The sector proxy moved with them: the Global X Uranium ETF (NYSEARCA: URA) was at $48.09, a gain of 4.41% against a prior close of $46.06.
What makes the move worth noting is the tape it happened on. The SPDR S&P 500 ETF Trust (NYSEARCA: SPY) was at $768.09, down 0.27% on the day and inside a session range of $765.99 to $769.70. The Dow 30 proxy (DIA) was weaker still at $528.83, off 0.98%. Only the Nasdaq 100 proxy (QQQ) held green, up 0.14% at $719.97. A double-digit percentage move in a single mid-cap developer while the broad index is red is not a beta story. It is a rotation.
The tape says buyers stepped in early and stayed
Intraday ranges tell you whether a move is a gap that faded or a bid that held. NuScale opened its session range at $9.84 and topped out at $10.99, and at the time of the last trade it sat at $10.96 — within pennies of the high. On an illustrative basis, that is a climb of roughly 11.4% from the session low, and it means the stock was not giving the gain back into the afternoon.
Oklo showed the same shape, if slightly less emphatic: a range of $41.80 to $44.68 and a last print of $44.09, in the upper part of the day's band rather than at the top. URA, at $48.09 against a high of $48.15 and a low of $46.65, closed the gap on its own session high almost exactly.
Three instruments, three ranges, all finishing the morning near the strong end. That pattern is more consistent with real demand than with a short squeeze that burns out in the first hour, though a single session cannot distinguish between the two with any confidence.
Why small modular reactors move the most in both directions
Small modular reactors, or SMRs, are factory-built nuclear units designed to be assembled from standardized components rather than engineered one at a time on site. The pitch is cheaper capital cost, shorter construction timelines and siting flexibility — including next to data centers that need firm, carbon-free power around the clock.
The financial consequence is that companies in this category are valued on projects and licensing milestones years out, not on cash flow now. That makes them long-duration assets in the same way a zero-coupon bond is: their present value swings hard on the discount rate and on any change in the perceived probability of the projects landing. When rate expectations tighten or risk appetite thins, they fall further than the market. When the mood turns, they bounce further too.
NuScale's 12.99% and Oklo's 6.83% against a 0.27% decline in the S&P 500 proxy are that mechanism working in reverse. The uranium ETF's 4.41% gain is the smoothed version — a basket that includes miners and fuel-cycle names as well as reactor developers, which is why it moved less than the two individual stocks. As 24/7 Wall St noted, the SMR developers were leading the complex higher rather than following it.
Exhausted selloff or a bounce inside a downtrend
The honest answer from one morning of prices is that you cannot tell. Sharp reversals off depressed levels are a feature of every downtrend as well as every bottom, and the strongest single-day rallies in a sector's history tend to occur while that sector is still falling. Investors treating Tuesday as confirmation are extrapolating from a data set of one session.
As 24/7 Wall St noted, the SMR developers were leading the complex higher rather than following it.
What would strengthen the case for something more durable:
- Follow-through without the index. A second and third session where nuclear names gain while SPY is flat or lower suggests capital is being allocated deliberately rather than reacting.
- Breadth inside the complex. URA is a useful check. If the developers keep running while the basket lags badly, the move is narrow and speculative. If the fuel-cycle and mining names follow, the thesis is being bought rather than the story stock.
- Volume and closing prices. Finishing near session highs, as all three did Tuesday morning, matters more if it repeats on rising volume.
- A named catalyst. Licensing steps, offtake agreements with power buyers, or financing news give a rally something to stand on. Absent that, this is flow.
How the rest of the market frames it
The divergence between the three benchmarks is itself informative. QQQ up 0.14% while DIA falls 0.98% and SPY falls 0.27% describes a session in which long-duration growth exposure was being tolerated and cyclical, dividend-heavy exposure was not. Nuclear developers sit on the growth side of that line despite being industrial businesses on paper, because their value is almost all terminal.
For anyone holding these names, the practical point is position sizing rather than direction. A stock that can add 12.99% in a morning can subtract a comparable amount just as fast, and the day range on NuScale — $9.84 to $10.99 — shows how wide the intraday band already is. Prices cited here are intraday and as of 15:15 GMT on Tuesday, September 8; the session was still open, and where these three instruments settled is a different figure from where they traded.
Frequently asked questions
How much did NuScale Power and Oklo gain on Tuesday?
NuScale Power traded at $10.96, up 12.99% from its prior close of $9.70, as of 15:15 GMT on September 8, 2026. Oklo traded at $44.09, up 6.83% from a prior close of $41.27. Both were intraday prices with the market still open, so final settlement figures would differ.
Did the broader stock market rise on the same day?
No. The SPDR S&P 500 ETF Trust was at $768.09, down 0.27% on the day, and the Dow 30 proxy DIA fell 0.98% to $528.83. Only the Nasdaq 100 proxy QQQ was higher, up 0.14% at $719.97. The nuclear gains therefore came against a soft broad tape.
What is a small modular reactor?
A small modular reactor, or SMR, is a nuclear unit built from standardized factory-made components rather than engineered individually on site. Supporters argue this lowers capital cost, shortens construction time and allows siting near power-hungry facilities such as data centers that need continuous carbon-free electricity.
Why do these stocks move so much more than the index?
Their value rests on projects, licensing approvals and contracts years in the future rather than current cash flow. That makes them long-duration assets, highly sensitive to shifts in discount rates and risk appetite. The result is amplified moves in both directions, which is why one fell 12.99% higher in a session while the S&P 500 proxy slipped.
Does the Global X Uranium ETF tell you anything the individual stocks don't?
Yes. URA holds miners and fuel-cycle companies alongside reactor developers, so it is a broader read on the sector. Its 4.41% gain to $48.09 was smaller than NuScale's or Oklo's, indicating the rally was led by the developers rather than being uniform across the whole nuclear supply chain.
Was there a specific catalyst behind the rebound?
No single named catalyst was identified. The move was described as a rotation back into nuclear names, led by small modular reactor developers. Without licensing news, offtake agreements or financing announcements attached to it, a one-day rally of this kind is better read as a flow event than as a change in fundamentals.
Sources
Photo: Adam Jones · BY-SA 2.0 — source
