The nuclear basket rallied on the AI-power-demand theme, led by Constellation and the utility restart rung, with NuScale the mild laggard against an otherwise green SMR complex.

The leader was Constellation Energy (CEG), up 4.6% to $270.74 on the restarts-and-utilities chokepoint — the operating reactor fleet that is the near-term answer to datacenter power. The move extends the sector's defining trade: hyperscaler demand for firm, carbon-free baseload, reinforced this month by Constellation's 890 MW clean-energy agreement with Google and by renewed policy noise around datacenters sourcing their own generation. The read-through hit the whole restart rung on a risk-on tape (the S&P 500 at a record): Vistra (VST) +3.9% to $156.14, GE Vernova (GEV) +4.0% to $925.92 and Talen (TLN) +2.9% to $359.49, with Brookfield Renewable (BEP) +3.3% to $29.17 alongside.

The laggard was NuScale Power (SMR), down 1.4% to $5.50 on the SMR-platforms chokepoint — the licensed small-modular design rung still years from revenue. The decline is best read as a mild giveback in the most speculative, longest-duration corner of the basket rather than a negative event: the rest of the SMR complex was green, with Oklo (OKLO) +0.9% to $27.73, NANO Nuclear (NNE) +2.9% to $13.33 and Lightbridge (LTBR) +3.6% to $5.42. On a day when the cash-flowing utilities led, the pre-revenue platforms simply lagged the quality bid.

The fuel-cycle rungs — the enrichment, conversion and uranium straits that are the vertical's true chokepoints — were firm but trailed the utilities. Solstice Advanced Materials (SOLS) rose 3.1% to $64.99 and Japan Steel Works' ADR (JPSWY) +2.9% to $20.88 on the forgings side, while Fluor (FLR) added 2.7% to $46.41. Uranium supply was mixed-to-up: Denison (DNN) +2.6% to $2.33 and Cameco (CCJ) +1.9% to $82.02, against Centrus (LEU) −0.9% to $108.91 as the HALEU name gave back. BWX Technologies (BWXT) edged up 0.6% to $135.11 into its own print next week.

The calendar is busy. BWXT reports Q3 on November 2 and NANO Nuclear delivers its fiscal year-end update November 15 — the next hard tests of whether component and SMR backlogs are converting. On the policy side, the Xe-100 construction-permit review hits an NRC 18-month milestone December 16, and the Westinghouse/US-government definitive agreements that would replace the binding term sheet are expected by year-end — the structural catalyst for the fuel-fabrication and private-giant rungs. Until BWXT's print, the AI-power demand narrative, not fuel-cycle supply, remains the basket's driver.