SKHX Rises 4.09% as SK Hynix's ADR Premium Compresses to 24% Into the Seoul Reopen

The 24% Gap the Perp Is Tracking

SKHX is a HIP-3 perp on SK hynix's Seoul-listed common stock: the oracle takes the KRW share price and converts it to USD at the prevailing USD/KRW rate, so it tracks the cheaper of SK hynix's two live equity prices. The other is the Nasdaq ADR, ticker SKHY, which began regular trading July 13 after a record $26.5 billion debut — the biggest first-time share sale ever by a foreign company. One ordinary share equals ten ADRs, and US demand ran hot enough that the ADR premium ballooned past 50% within three days of listing. It has since compressed to about 24% by July 17-18. With SKHY near $154.03 per ADS — roughly $1,540 a share at the 10-to-1 ratio — versus the perp near $1,207, SKHX is the live read on the discounted Seoul leg, and its 4.09% gain is that gap grinding shut from the bottom up.

Why Seoul Cratered, Then Bounced

The gap didn't open on a memory-demand scare. On Monday July 13, SK hynix's Seoul shares fell 15.4% — their worst session in nearly two decades — while the ADRs dropped 9.3%, after the Bank of Korea delivered a surprise 25bp rate hike, its first in about three and a half years, tripping a KOSPI circuit breaker. By Friday the stock had clawed back roughly 8%, helped by bargain-hunting, HSBC reaffirming SKHY as its top chip pick, and options-expiry short-covering on the newly listed US contracts. That is the recovery SKHX is now pricing ahead of the Seoul reopen, when local shares get their first chance to react to Friday's US tape — with new Korean rules banning single-stock leveraged ETFs and lifting minimum deposits to 30 million won adding a near-term source of volatility.

The July 29 Test

The hard catalyst is Q2 earnings on July 29. Estimates put operating profit near ₩60.4 trillion — a large year-on-year jump but roughly 8% under consensus, as full-scale HBM4 mass production slipped to Q3 and the anticipated Q2 shipment ramp didn't fully land. SK hynix still sits first in HBM with a 56.4% Q1 revenue share, so the print is less about demand than about timing. Longer term, SK hynix and Samsung's 800 trillion won (~$518 billion) plan to build four new Korean memory fabs frames the AI-memory bull case — while also inviting US tariff pressure over where the capacity gets built. Until the print, the perp remains the only continuously trading venue on the name, and the ADR premium is the anchor it keeps swinging toward.