SK Hynix's Korean-listed stock and its US American Depositary Receipt (ADR) are trading at a significant price gap, with the ADR trading up to 52% higher than the domestic shares, according to data from the Korea Exchange on July 27. The disparity has drawn attention as cross-conversion between the main stock and ADR is set to begin on July 29, potentially triggering arbitrage activity. The price gap stems from strong demand for SK Hynix ADR in the US market, where the stock launched at $149 and closed at $154.57 on July 24—equivalent to approximately 2,256,000 won per share compared to the Korean stock's July 27 close of 1,816,000 won. Market participants anticipate that the upcoming cross-conversion mechanism could narrow the premium as investors buy cheaper Korean shares and convert them to ADRs for sale in the US. The Wall Street Journal characterized the premium as "another signal of AI trading overheating," with senior market columnist James Mackintosh stating that such a premium "should not happen in the market."
SK Hynix ADR Trades at Up to 52% Premium Over Korean Stock on July 27
SK Hynix closed at 1,816,000 won on July 27, up 3.24% from the previous trading day, according to the Korea Exchange. The stock rebounded slightly after an 8% decline on July 24, but remains below half of the securities industry's highest target price of 4,200,000 won. The ADR launched at $149 on the 10th and the premium over the Korean main stock reached a peak of 52%. The premium narrowed from 33.2% on July 23 to approximately 28.3% on July 24. Converting the July 24 ADR closing price of $154.57 to won yields approximately 2,256,000 won per Korean share, nearly 500,000 won higher than the domestic stock's July 27 close of 1,816,000 won. The Wall Street Journal described the price disparity as "another signal of AI trading overheating." James Mackintosh, WSJ senior market columnist, stated that "the enormous premium formed in SK Hynix ADR compared to the Korean-listed stock is something that should not happen in the market."
Cross-Conversion Between SK Hynix Stock and ADR Begins July 29
On July 29, 17.79 million underlying shares of SK Hynix ADR will be additionally listed on the domestic market, and the cross-conversion application procedure between the main stock and ADR will begin. The additional listing volume represents approximately 2.5% of total issued shares. The additional listing consists of underlying shares deposited for ADR issuance, so 17.79 million shares of new supply will not be released into the domestic market. The core mechanism is arbitrage trading. If the ADR remains more expensive than the main stock, investors can buy the relatively cheaper domestic main stock, convert it to ADR, and sell it in the US. In this scenario, buying demand flows into the domestic main stock while ADR supply increases in the US, potentially narrowing the price gap between the two.
Analysts Cite Arbitrage Opportunities and Historical Precedents for Premium Narrowing
Jeong Min-hee, researcher at Aris, stated, "If the ADR price is sufficiently higher than the original stock, institutional investors can consider buying the domestic original stock, converting it to ADR, and selling it in the US market." Jeong added, "After comprehensively considering price disparity, exchange rate, ADR conversion cost, time lag required for conversion, and liquidity, arbitrage is executed when actual profit occurs." Historical cases show that main stock appreciation played a significant role in narrowing price gaps. Shinhan Investment Securities analyzed four overseas companies and three domestic companies that listed ADRs in the US and found that approximately half of the cases where price gaps narrowed in high-premium periods occurred through main stock appreciation rather than ADR decline. After high premiums occurred, main stocks recorded excess returns compared to the market over both 20 trading days and 60 trading days. Lee Jung-bin, researcher at Shinhan Investment Securities, stated, "When the cross-conversion application procedure begins on July 29, the market adjustment function for the price disparity between the main stock and ADR may be partially strengthened. However, whether the premium actually narrows will depend on the scale of new ADR issuance and market supply and demand."
FAQ
What is the price gap between SK Hynix Korean stock and its US ADR as of July 27?
SK Hynix's US ADR closed at $154.57 on July 24, equivalent to approximately 2,256,000 won per share, while the Korean stock closed at 1,816,000 won on July 27—a gap of nearly 500,000 won. The ADR premium over the Korean main stock reached a peak of 52% and stood at approximately 28.3% on July 24.
When does cross-conversion between SK Hynix stock and ADR begin?
Cross-conversion application procedures between SK Hynix's Korean main stock and US ADR begin on July 29. On the same date, 17.79 million underlying shares of SK Hynix ADR (approximately 2.5% of total issued shares) will be additionally listed on the domestic market.
How could arbitrage trading affect the SK Hynix stock-ADR price gap?
If the ADR remains more expensive than the main stock, institutional investors can buy the cheaper domestic stock, convert it to ADR, and sell it in the US. This creates buying demand for the Korean stock and increases ADR supply in the US, potentially narrowing the price gap. Historical precedents show that approximately half of high-premium cases narrowed through main stock appreciation rather than ADR decline.
