The whole nuclear complex sold off with the data-center power trade; Talen led the losses down 11.0% and NextEra alone held flat as a regulated-utility refuge.

There was no rally to lead — only a place to hide. Every quotable name in the basket closed lower or flat as the AI-capex derating that hammered semiconductors spread straight into the power-and-restarts choke, and NextEra was the sole name to hold the line, unchanged at $86.22. That is the tell for how this vertical now trades: the restarts-and-utilities choke has become a levered bet on datacenter electricity demand, so a regulated utility with a rate-based earnings stream behaves like ballast on a risk-off day while the merchant and developer names take the hit. Flat was the best outcome on offer.

The laggard was the choke's most-loved name. Talen Energy fell −11.0% to $317.66, unwinding the merchant-nuclear-to-hyperscaler trade hardest as the market digested a second-quarter GAAP loss with revenue and earnings below some Street expectations — even with full-year guidance raised — alongside a large unrealized derivative loss, higher interest expense, and a June resale registration that added share supply. The structural read: Talen sits at the exact intersection of scarce baseload generation and hyperscale demand this vertical maps, and that positioning cuts both ways — the same leverage that re-rated it all year is what reprices it when the AI-power narrative wobbles.

The selloff ran the length of the complex. Independent power and datacenter generation led lower — Vistra −3.8% to $140.52, Constellation −4.1% to $266.83, GE Vernova −6.9% to $1,004.53, Brookfield Renewable −4.8% — and the SMR-and-advanced-reactor platforms sold with the speculative tape: Oklo −5.7% to $41.36, NuScale −6.0% to $8.64, Nano Nuclear −6.8% to $18.25. The uranium-and-fuel choke drifted lower on lighter damage: Cameco −2.6% to $96.03, Uranium Energy −1.9% to $10.96, NexGen −4.6% to $10.26, Centrus −4.6% to $175.70, Energy Fuels −4.7% to $14.09. The forgings-and-components choke held best — Curtiss-Wright −0.1% to $695.67, BWX Technologies −3.8% to $165.01, Huntington Ingalls −0.2% — the long-cycle order books that don't reprice on a single day's sentiment.

The calendar is quiet near-term and thickens into September. Solstice Advanced Materials reports Q2 on September 2, the World Nuclear Symposium runs in London September 9–11, and the NRC's final Environmental Impact Statement for GLE's Paducah laser-enrichment facility — a real HALEU-supply milestone at the enrichment choke — is expected around September 30. With no reactor-specific catalyst on the tape, the near-term tell is simply whether the data-center-power trade stabilizes: nuclear has tied its multiple to AI electricity demand, and until that macro settles, the complex trades as one.