SK Hynix ADR arbitrage window closes; the price gap previously reached as high as 51%.

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The huge price gap between SK Hynix’s American Depositary Receipts (ADR) and Korean local shares cannot be eliminated in the short term.

On Thursday, the Korea Securities Depository (KSD) clarified that the upper limit for converting SK Hynix local shares into ADRs is set at 2.5% of the total shares, and this quota was completely used up in the $26.5 billion ADR issuance completed on July 10.

KSD CEO Rhee Yunsu stated in a phone interview that unless existing ADR holders convert their ADRs back into Korean shares to free up quota, investors currently cannot convert Seoul-listed shares into ADRs.

This structural restriction means that the normal cross-market arbitrage mechanism has been effectively blocked. The premium of SK Hynix ADRs relative to Korean local shares once reached as high as 51% and was still hovering at about 33% as of Wednesday. The blocked conversion channel means this price difference may persist long-term, giving rise to a series of alternative market strategies.

Arbitrage mechanism breaks down, premium remains high

SK Hynix completed the largest-ever stock issuance by a foreign company in the US on July 10, after which the pricing discrepancy between ADRs and Korean shares became a market focus.

Normally, the price gap between ADRs and corresponding local shares can be quickly closed through issuing or canceling ADRs via conversion. However, the current conversion channel faces two blockades: First, Citigroup as depositary bank announced that, as the newly-issued Korean common shares cannot be transferred before listing on the Korean Exchange, the issuance and cancellation channel for ADRs will remain closed until July 29; Second, KSD’s statement further clarified that even if the channel reopens, the 2.5% conversion quota has been exhausted, leaving very limited capacity, and whether further regulatory approval is needed remains unclear.

The double blockade leaves arbitrageurs with virtually no options. SK Hynix ADR premium once surged to a historical peak of 51%, and as of Wednesday was still approximately 33% higher than local shares.

Structurally similar to TSMC, premium may become the norm

KSD’s statement revealed the structural nature of SK Hynix ADRs—its mechanism is highly similar to that of TSMC ADRs.

TSMC ADR holders can convert their certificates into local shares in Taiwan, but local shares cannot be freely converted into ADRs. This one-way mechanism leads to a long-term premium for its US shares. According to Bloomberg data, TSMC ADRs have averaged a 12.6% premium over the past five years.

SK Hynix’s situation is similar, but with a more extreme premium. Each SK Hynix ADR corresponds to one-tenth of a common share. ADR holders can cancel certificates and receive Korean shares, but the reverse operation is strictly restricted. Analysts believe this structural constraint significantly increases the likelihood of a long-term premium.

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