A Piper Sandler rating split and climbing rate-hike odds sank the advanced-reactor and enrichment complex, with Centrus down nearly 9%.

The nuclear basket had one of its worst sessions of the quarter, and the damage concentrated on the enrichment chokepoint. Centrus Energy (LEU) fell 8.6% to $165.87, the steepest decline in the group, even though its own fundamentals are intact — Q2 revenue of $176.1 million, up 14%, on a multibillion-dollar enrichment backlog. This was a valuation and rate move, not a fundamental break. The macro set the tone: a fourth straight down day for the indices, WTI above $100, and Fed funds futures pricing roughly a 73% chance of a quarter-point hike next week. Advanced nuclear is acutely rate-sensitive because its reactors require capital years before commercial revenue, so rising yields discount the whole build.

A sector-specific catalyst amplified it. Piper Sandler issued a split rating action across advanced nuclear, and the developer names dropped in near-lockstep: Oklo (OKLO) −6.3% to $39.88, NuScale (SMR) −5.6% to $10.21, X-Energy (XE) −8.2% to $15.84, and NANO Nuclear (NNE) −4.5%. The fuel-cycle names went with them — Energy Fuels (UUUU) −6.3% to $13.63, Cameco (CCJ) −3.0% to $97.42 — as the market cut duration across every pre-cash-flow rung from the mine to the reactor.

The one green was defensive and telling: Huntington Ingalls (HII) rose 0.3% to $281.67, the naval-propulsion end of the vertical, where nuclear work is funded by a defense budget rather than a merchant-power thesis. The utility-scale power buyers that anchor the demand case softened but held better than the developers — GE Vernova (GEV) −2.9% to $923.91, Constellation (CEG) −2.7%, Vistra (VST) −2.7%, Talen (TLN) −2.5% — a reminder that the operating fleet and the not-yet-built fleet trade on very different clocks.

The catalyst path runs through the fuel cycle first. The NRC's final Environmental Impact Statement for GLE's Paducah laser-enrichment facility is expected by late September — the domestic-enrichment signal that bears directly on the chokepoint LEU just sold off on. X-Energy's Xe-100 hits an 18-month NRC construction-permit review milestone December 16, BWXT reports Q3 on November 2, and definitive Westinghouse/U.S. government agreements are targeted by year-end. Further out, the 2028 termination of Russian LEU import waivers keeps the structural bid under domestic enrichment that today's tape looked straight past.