MU Perp Drops 11.24% as Korea Floats AI Profit Windfall Tax

The Catalyst

This one has a name on it. South Korea's presidential chief of staff Kim Yong-beom posted a proposal on Facebook calling for a "national dividend" funded by taxing excess AI corporate profits, arguing the gains of the AI era should be "widely shared by Korean citizens" rather than concentrated inside chipmakers. The KOSPI fell as much as 5.1% on the headline, wiping more than $300 billion in market value, with Samsung Electronics and SK Hynix both off 4% in Seoul. The presidential office later clarified the post reflected Kim's personal views and that he meant "excess tax revenue" generated by the AI boom rather than a fresh windfall levy — but the damage to memory was already done. The market doesn't care whether the policy ships in Korea; it cares whether the idea travels.

Why Memory Got Hit Hardest

Micron is not a Korean company and does not manufacture in Korea, so the direct policy risk is essentially zero. The cash tape didn't care: MU printed an intraday low of $708.50 and was down as much as 9.72% to $718.01 by 10:10 a.m. ET, and the HIP-3 perp tracked the move with a 22-hour cut of 11.24% to $717. The mechanism is positioning, not fundamentals — Micron is 23.83% of the Roundhill Memory ETF (DRAM), which had a near-parabolic run into Monday, and the contagion swept every US memory peer with Sandisk down ~9% and Western Digital down ~8%. When the basket trade unwinds, the most over-owned name takes the most pain, and that was MU by a wide margin.

The Setup Going In

Yesterday's piece flagged this exact unwind risk going into the CPI print: the 14-day RSI was pinned near 85, the put/call open interest ratio sat at the 87th percentile of annual readings, and Micron had just closed at a record $795.33 after a 37.7% weekly gain — the best week in its history. The Korea headline was the trigger, but the powder was already loaded. Today's cash low of $708.50 is a 10.9% drawdown from that record close in a single session, and the perp has now retraced the entire post-CPI bounce. The fundamentals that drove the rip — HBM sold out through 2026, sell-side targets at $1,000 from DA Davidson and Deutsche Bank — are unchanged. What changed is the macro lens: traders just got a preview of how fast this cohort prices in tail risk when a windfall-tax narrative shows up anywhere on Earth.