SK Hynix’s American depositary receipts have traded at a substantial premium to the company’s locally listed shares in South Korea, according to a Wall Street Journal report cited by BlockBeats on July 26.
Each ADR represents 0.1 share of the stock listed in Seoul and can be converted into Korean shares. Since the U.S. listing began two weeks ago, the premium over the Korean stock has ranged from 16% to 51%. It still stood at 29% on Friday, the report said.
U.S. investors are paying more for direct access in New York
The report said U.S. investors have been willing to pay a higher price to trade SK Hynix directly in New York instead of seeking out brokers that can access the Korean market. It said the pricing gap shows that U.S. markets are paying more for chip stocks in general, with especially strong demand for memory shares, making the ADR another sign of the current AI trading boom.
Regulatory limits have weakened the normal arbitrage mechanism
In most dual-listed structures, large pricing gaps tend to attract arbitrage traders, who buy the cheaper line of stock, convert it, and sell into the more expensive market.
That process is constrained here. While SK Hynix ADRs can be converted into Korean shares, the report said Korean shares are difficult to convert back into ADRs because of regulatory restrictions, and the process cannot be carried out without company approval. As a result, hedge funds cannot execute a risk-free arbitrage trade. If the premium widens further, shorting the ADR could also lead to heavy losses.
Some premium may be justified, but not at current levels
The report said part of the spread can be explained by practical factors, including South Korea’s stock transaction tax, lower trading and custody costs in the United States, the benefit of dollar-denominated exposure for U.S. investors who do not want to manage foreign exchange risk, and better tax efficiency for ADRs held in U.S. exchange-traded funds.
Even so, those factors would usually support only a premium of a few percentage points, not the much larger gap now seen in SK Hynix’s ADR.
TSMC’s ADR history offers a benchmark
As a comparison, the report said Taiwan Semiconductor Manufacturing Co. ADRs carried an average premium of 3.2% from 2010 to 2020. Since ChatGPT was launched in 2022, that average premium has risen to 15%.
The report said the elevated premium in SK Hynix ADRs indicates that U.S. trading demand for AI chip and memory shares is materially stronger than demand in South Korea.
How the premium closes will matter for holders
The report added that the premium could narrow if investors shift to the cheaper Korean shares, if the company issues more ADRs, or if market enthusiasm cools.
If the gap closes because Korean shares rise, ADR investors may see limited impact. If it disappears because the U.S.-listed ADR falls, or because chip stocks in both markets decline at the same time, holders could face losses.