SKHX Keeps Falling as SK Hynix's Seoul Leg Trades at a Discount to Its New Nasdaq ADR

The Seoul Leg Is the Discount Side Now

SKHX is a perp on SK Hynix's Seoul-listed common (ticker 000660), oracle-priced off the KRW quote converted to USD. That detail is the whole story right now, because SK Hynix suddenly has two prices. On July 10 the company debuted on Nasdaq, pricing ADRs at $149, raising roughly $26 billion, and closing up about 13% in its first US session. Three sessions later the Seoul shares fell 15.4% — the worst single-day drop in the stock's history. The ADR held a premium of around 25% over the Korean line, and that gap is the tell: with a deep, dollar-denominated ADR now trading, foreign and institutional money is rotating out of the Seoul listing and into the ADR. SKHX tracks the leg they're selling.

HBM4 Slipped a Quarter

The rotation would be cleaner if the fundamentals hadn't wobbled at the same time. A Korea Investment & Securities note trimmed the bull case just as the ADR was repricing the company: the broker cut its Q2 blended DRAM ASP growth estimate from roughly 50% to about 29% quarter over quarter and flagged that next-gen HBM4 mass production has slipped into the third quarter rather than scaling in Q2 as bulls had penciled in. The result is a second-quarter operating-profit number the desk now sees landing roughly 8% below consensus. Fixed-price HBM supply contracts are the mechanism — they cap how fast SK Hynix's blended pricing can chase the spot memory recovery. Preliminary Q2 results are due July 22, the next hard catalyst on the calendar.

What the Perp Is Pricing

At $1,246, SKHX is down 13.53% over the past 23 hours and firmly in continuation — this is the same slide that opened with the July 13 Seoul plunge, not a fresh shock. Two things keep the move legible. First, the perp carries an FX overlay: because the oracle converts the KRW quote at the live USD/KRW rate, part of any print is currency, not equity. Second, the cleanest signal here is the ADR-versus-Seoul spread — as long as the ADR trades at a premium, the Seoul leg, and SKHX with it, is the side under pressure. About $863 million in SKHX perp volume has churned over 24 hours, so the book is deep enough to trade the July 22 print, though the basis to the underlying can widen in fast tape. The two things worth tracking: whether the HBM4 Q3 ramp gets confirmed, and whether the ADR premium compresses back toward parity.