The nuclear fuel cycle split from the power generators on Tuesday — Solstice +7.3%, GE Vernova +6.6% and Centrus +4.8% firmed while merchant-power names sold off, Constellation −4.2% the laggard.

Solstice Advanced Materials (SOLS) led the nuclear basket on Tuesday, up 7.3% to $88.60, at the front of a clear divergence: the fuel-cycle names rose while the merchant-power generators fell. Solstice sits on the conversion-deconversion chokepoint as the operator of Metropolis Works, the only domestic US UF6 conversion plant, marketed through the ConverDyn JV with General Atomics. There was no single dated catalyst on Tuesday; the move extended strength in the front end of the fuel cycle, where Solstice's roughly 10,000-tU UF6 output guidance for 2026 against a $2B-plus backlog gives it structural scarcity value as utilities scramble to re-shore conversion capacity away from Russia. On a session that rewarded the enrichment-and-conversion strait, SOLS was the cleanest expression of it.

Constellation Energy (CEG) was the laggard, down 4.2% to $248.37, and the split is the session's story. Constellation is the largest US nuclear operator, but it trades as a merchant-power and data-center-demand proxy, not a fuel-cycle name — and on a risk-on, tech-led day capital rotated out of the independent-power complex. Talen (TLN −3.8%) and Vistra (VST −2.3%) fell with it. There was no fresh company-specific catalyst to date to Tuesday; the read is a rotation out of the power-generation side of the thesis while the conversion-enrichment-fabrication chain caught a bid.

That fuel-cycle strength was broad. On the fabrication and deconversion node, GE Vernova (GEV) rose 6.6% to $1,174.86 — its GE Hitachi unit is the BWRX-300 SMR vendor and a HALEU-deconversion IDIQ awardee — and BWX Technologies (BWXT) added 2.9% to $194.65. On enrichment, Centrus (LEU) gained 4.8% to $167.87, operator of the only NRC-licensed US HALEU cascade at Piketon. Curtiss-Wright (CW) firmed 2.8% to $757.76 on the components side. The offsets were on the mining and generation ends: NexGen (NXE −3.2%) slipped with the uranium miners even as the conversion-and-enrichment midstream led.

The near-term calendar is policy-first. The DOE Reactor Pilot Program's criticality deadline lands July 4, with a target of three or more advanced-reactor criticalities — a direct read on whether the domestic buildout is hitting its milestones. Earnings then cluster at month-end: Constellation reports Q2 on July 30, Cameco on July 31, BWXT on August 3, Centrus around August 4, and Talen on August 6 — the first hard tests of whether the fuel-cycle bid and the power-demand narrative can reconverge.