A reported US ban on Chinese optical transceivers sent the interconnect chokepoint vertical, while the AI-power trade rotated hard the other way and Vistra sank.

Applied Optoelectronics led the vertical and the tape it trades on, jumping +19.4% to $131.63 after a Reuters report that the Trump administration and FCC are drafting a ban on imports of new Chinese optical transceivers — the fiber components that move data between racks inside AI data centers. That is the optical-interconnect chokepoint stated as policy: cut off the Chinese modules and demand routes to the US-based suppliers. AAOI is the purest listed proxy for that shift, and it was not alone — this was a group trade, not an earnings move (its own Q2 is due August 6). Fabrinet, the contract manufacturer that assembles much of the industry's optics, rose +16.5% to $531.03, and Coherent added +12.4% to $323.73 on the same catalyst plus fresh price-target hikes.

The mirror image was the AI-power trade unwinding. Vistra fell −8.2% to $143.23 — and it did so on a record-up day, which marks it as rotation, not a market selloff. No fresh company catalyst hit the tape; money moved out of the crowded merchant-power and IPP names at the power-grid chokepoint and into the chip-and-optics complex, with a PJM capacity-price-cap overhang and pre-earnings de-risking ahead of Vistra's August 7 report compounding the move. Constellation Energy (−2.4% to $267.25) and Talen (−1.3%) leaked lower alongside it, but Vistra took the brunt.

Elsewhere the semis-and-materials layer did the confirming work. Entegris soared +15.5% to $144.56 after a clean Q2 beat at the substrates-and-materials choke — adjusted EPS $0.93 versus $0.82, revenue $883.2M against $834.7M, and Q3 guidance above consensus. Marvell gained +12.8% to $218.59 on a dual driver: a preview of new AI memory and storage products plus the transceiver-ban tailwind, with KeyBanc lifting its target to $400. Intel added +10.8% on sector sentiment. After the close, AMD reported a beat — record revenue near $11.5B, data-center revenue up about 107% to $6.7B — but the stock slipped roughly 9% after hours on valuation and AI-ramp concerns, a caution flag for Wednesday's open.

The calendar stress-tests both sides of the choke immediately. Eaton and Vertiv both report Q2 today, the direct read on whether the electrical-and-cooling order book is still compounding as the power names sell off. SoftBank's quarter lands August 7, and Applied Materials and Coherent both report August 13 — the semicap and optics tape check. Vistra's own August 7 print now carries extra weight as the test of whether Tuesday's rotation was fundamental or just positioning.