SK hynix staged an 11.3% V-shaped rebound in Seoul a day after the circuit-breaker crash, while the US AI-infra tape took profits ahead of Micron's after-the-bell print.

SK hynix (000660.KS) jumped 11.3% to KRW 2,917,000 in its latest Seoul session, leading a V-shaped KOSPI recovery (+3.3%) that recouped much of Tuesday's roughly 10% rout. The rebound rode heavy short-covering plus two reports — Samsung preparing a buyback worth nearly KRW 90T, and SK hynix accelerating a ~$26B US ADR listing. SK hynix is the HBM-memory chokepoint, roughly 60% of high-bandwidth-memory share and about two-thirds of NVIDIA's HBM4; after Tuesday's reflexive air-pocket, the snap-back is a reminder that the most concentrated link in the AI stack is also the most sentiment-driven, swinging double digits in both directions on positioning rather than fundamentals.

Cleveland-Cliffs (CLF) fell 5.3% to $10.57, the basket's worst, as the steelmaker — mapped here to the power-grid chokepoint for its grain-oriented electrical steel, the input to grid transformers — sold off with the broader industrial and energy complex; Brent crude dropped 4.3% to $73.74. The structural read is that the transformer-steel link is a slower-moving chokepoint that trades with industrial cyclicals and the oil tape, not with the AI-capex narrative that drives the rest of the basket.

The US AI-infra session was a profit-taking day: the S&P 500 and Nasdaq slipped while the Dow held, and the customers and neoclouds led lower — CoreWeave (CRWV −4.6%), Amkor (AMKR −4.6%) on advanced packaging, Microsoft (−2.3%), ASML (−0.9%). The optics and packaging suppliers were the green exception — ASE (ASX +3.9%) on advanced packaging, Coherent (COHR +3.0%) and Lumentum (LITE +1.8%) on optical interconnect — alongside GE Vernova (GEV +2.2%) on grid power. Micron (MU −0.3%, $1,048.51) drifted into its print.

The catalysts come fast. Micron's FQ3 — the first full HBM4-ramp quarter — reported after Wednesday's close, the cleanest read on the memory chokepoint after Seoul's wobble. Commerce's Section 232 data-center-semiconductor report to the President is due around July 1, a latent onshoring catalyst; PJM's 2028/2029 capacity auction closes July 7, a direct read on the data-center power premium; and ASML (July 15) and TSMC (July 16) open the equipment-and-foundry print wave that frames the back half of the buildout.