SK Hynix’s Nasdaq-listed ADRs, trading under the ticker SKHY, have held an average premium of roughly 30% over the company’s Korean ordinary shares in the two weeks since listing, opening a rare same-stock pricing gap across markets and drawing arbitrage traders into equities, crypto venues, and DeFi.
The original article, written by Jae for PANews, says the rush into these trades accelerated last week as traders moved between Korean spot shares, U.S. ADRs, crypto perpetual contracts, and on-chain rate products in search of ways to capture the spread.
Why the premium opened up
The report attributes the dislocation to three forces acting at the same time: a blocked two-way conversion channel between ADRs and Korean shares, retail demand spilling into crypto markets, and trading-hour gaps between Korea, the U.S., and 24-hour crypto platforms.
On July 9, SK Hynix priced 177.9 million ADRs at $149 apiece, raising $26.5 billion in what the article describes as the largest ADR issuance ever by a foreign company. The deal was more than seven times oversubscribed. Baillie Gifford and Coatue were named among cornerstone buyers, with $5 billion committed in aggregate, while the new issuance accounted for only about 2.5% of the company’s total share capital.
In principle, 10 SKHY ADRs correspond to one Korean ordinary share. In practice, traders have not yet been able to move freely in both directions. The article says this ADR program was created through a new share issuance rather than by depositing existing shares, and that under rules set by Korea’s securities depository, applications for two-way conversion between ordinary shares and ADRs can only begin on July 29. Before that date, the market supports only one-way cancellation of ADRs into Korean shares, not the reverse creation of new ADRs.
That bottleneck matters. In a normal ADR setup, arbitrage traders buy the cheaper local stock, convert it into ADRs, and sell the U.S. line until the spread narrows. Here, the supply channel into the U.S. market remains shut for now, while demand has rushed into a limited free float. Combined with enthusiasm around AI memory names, that has kept the ADR premium elevated.
The article compares the pattern with the long-running premium often seen in Taiwan Semiconductor Manufacturing Co. ADRs, while noting that SK Hynix’s price swings have been sharper. It adds that the premium may compress once SEC F-6 paperwork and the conversion window fall into place later in July, but says the spread remains wide enough to support active arbitrage until then.
Why crypto traders piled in
The crypto side of the trade has its own driver. Many traders cannot directly open Korean brokerage accounts to buy local SK Hynix shares, so they have turned instead to perpetual contracts listed on crypto exchanges.
During last week’s sharp pullback, retail traders rushed into SK Hynix perpetuals on Binance and Hyperliquid to buy the dip, pushing funding sharply higher. Over the past 30 days, the article says the annualized funding rate on these contracts stayed above 30% for most of the period.
Trading-hour gaps have added another layer. When Korean and U.S. stock markets are closed, perpetual markets lose a direct external price anchor. In those windows, pricing leans heavily on exponentially weighted moving average, or EWMA, calculations, which can make contracts move early or lag underlying markets and create temporary arbitrage openings.
Strategy 1: Long Korea, short the ADR
The most direct trade is to buy SK Hynix ordinary shares in Korea and short SKHY in the U.S., betting that the premium will narrow. The article uses an example in which traders act when the ADR premium rises above 35%, buying Korean spot shares through Interactive Brokers, or IBKR, while shorting SKHY.
Trader yourQuantGuy, cited in the article, says the key cost is stock borrow. Borrow rates on the short side reportedly reached as high as 50% annualized shortly after listing, then fell quickly to about 2% to 5% as supply improved. With a portfolio margin account, the article says the offsetting long and short can also keep capital usage low. If the premium drops below 30% and the position is closed in stages, the trade can return more than 4%.
The report is clear that this is not risk-free. It is a convergence bet. Traders may expect the gap between Korean shares and the U.S. ADR to normalize, but the article points to TSMC as a reminder that ADR premiums can persist even after conversion channels open. SK Hynix ADRs also have an issuance cap, and retail participation in conversion may still face operational hurdles. If supply into the ADR market does not expand as much as expected, the premium could remain in place for longer and leave convergence shorts under pressure.
Strategy 2: Spot-perp cash and carry
Once crypto exchanges listed SK Hynix perpetuals, on-chain and exchange-based basis trades became one of the busiest parts of the market.
The structure is simple: buy Korean spot shares through a broker, then short an equivalent amount of perpetual contracts on Binance or Hyperliquid. The spot long and perp short neutralize most of the stock-price move, while the short perp leg collects funding from longs as long as the rate stays elevated.
Strategy 3: Exchange-rule arbitrage and EWMA distortions
The article says major crypto venues use different index rules and funding-settlement schedules, which regularly creates both price gaps and funding-rate gaps between platforms.
During hours when stock markets are closed, Binance uses an EWMA-based index to calculate mark prices, making its contracts more likely to move ahead of the next cash-market open. Hyperliquid references pre-market and after-hours indications. OKX uses a blended index that incorporates the first two. Trader Sanfen, cited in the article, says that this often leaves Binance perpetuals priced above OKX, with Hyperliquid lower still.
The report also points to a cap-related opening. Binance’s single funding interval cap was at one point fixed at 0.5% per eight hours, while Hyperliquid settles funding hourly and has no cap. That difference helped push the SK Hynix contract spread to as much as $30. The article says some traders made hundreds of thousands of dollars in a short period by shorting Binance and going long on Hyperliquid.
That edge can disappear quickly. In mid-July, Binance changed SK Hynix perpetual funding from an eight-hour schedule to a four-hour schedule, and the article says the spread narrowed by nearly half within half a day. Any strategy built around venue mechanics has to account for frequent rule changes.
Strategy 4: Cross-market derivatives and ETF discount trades
The article highlights another opening from last Friday, July 17. With Korean equities closed and Hong Kong still trading, a 2x long SK Hynix ETF in Hong Kong briefly traded at more than a 20% discount after heavy selling. Traders could buy the discounted ETF and short SK Hynix perpetuals on crypto venues to hedge the exposure, then close the position once Korean trading resumed and the discount tightened.
Strategy 5: Locking funding into fixed yield with Boros
On July 20, Pendle’s structured rate platform Boros launched a market for funding rates tied to Hyperliquid’s SK Hynix perpetual contract. That gave traders a way to turn floating funding income into fixed returns.
The article describes a delta-neutral structure with three legs:
- Buy SK Hynix ordinary shares through a traditional broker such as IBKR.
- Open an equivalent short position in SK Hynix perpetuals on Hyperliquid and receive floating funding.
- Short YU on Boros, effectively selling floating funding exposure and locking in a fixed return of about 30%.
In that setup, the stock leg and perpetual short create delta neutrality, while the floating-rate exposures offset each other. The fixed-rate leg on Boros becomes the net source of return.
Costs and constraints remain
The article notes that liquidity in Boros rate markets and in Hyperliquid’s order book is still thinner than in traditional equity markets. Large positions can run into wider spreads and heavier slippage on entry and exit, which reduces actual net returns.
Cross-border friction is another issue. Won exchange-rate moves, changes in borrow costs, and settlement delays can all eat into profit. For ordinary investors, covering every source of risk may be difficult.
Even so, the article argues that arbitrage capital is unlikely to leave while large spreads and rich funding persist. It frames the SK Hynix trade as a case study in how traditional financial assets are being reworked through DeFi infrastructure into multiple layers of tradable basis, cross-venue funding differentials, and rate derivatives.
With the ADR conversion window expected near the end of July and earnings approaching, the report says those two events could become key turning points for the premium.