Key Takeaways:
SK Hynix's American depositary receipts trade at a 33% premium to the memory chipmaker's Seoul-listed shares after a 2.5% conversion cap halted arbitrage following its $26.5 billion Nasdaq debut on July 10.
"The restriction removes the usual arbitrage force that keeps New York and Seoul prices aligned," Rhee Yunsu, chief executive officer of the Korea Securities Depository, said.
The entire 2.5% allocation has been used through the initial ADR issuance, Rhee said, meaning investors cannot convert Seoul shares into ADRs unless existing holders cancel receipts first. The premium peaked at 51% on July 14 before settling around 33%, Bloomberg data shows. Each ADR represents one-tenth of a common share.
The pricing gap signals potential froth in AI-related semiconductor stocks, where demand has overwhelmed supply. The premium is expected to persist until at least July 29, when SK Hynix reports second-quarter earnings and two-way conversion between the shares begins.
The structure mirrors TSMC's ADR setup, where US-listed shares have traded at an average 12.6% premium over the past five years, Bloomberg data shows. TSMC's premium persists because converting Taiwan-listed shares into ADRs requires board approval and regulatory clearance. SK Hynix faces similar constraints, with the Korea Securities Depository verifying issuance limits through Citigroup, the depositary bank.
The ADR book-building attracted orders totaling $200 billion, more than seven times the shares on offer, Bloomberg reported. Domestic investors have net purchased $547.5 million of SK Hynix ADRs between July 10 and July 20, KSD data shows.
Starting July 27, investors can convert domestic shares into ADRs and vice versa, a mechanism that should narrow the gap. "If ADRs trade at a premium, arbitrageurs can deposit domestic shares with the depositary bank, receive ADRs and sell them," said Lee Jong-wook, a researcher at Samsung Securities. However, conversion fees, foreign exchange procedures and verification steps may limit immediate activity. The ADS custody limit stands at 1.78 billion shares, or 25% of total outstanding, leaving 22.5 percentage points of additional issuance capacity, per the SEC Form F-6.
Investors are now focused on SK Hynix's second-quarter results due July 29. UBS on July 8 recommended selling domestic shares and buying ADRs, a strategy that has paid off. "If the US premium feeds through to a rebound in domestic shares, increasing exposure makes sense," said Noh Dong-gil, a researcher at Shinhan Investment. "If the premium persists while domestic shares stagnate, investors should consider trimming positions."
The premium also serves as a broader market signal. A sustained ADR premium above 30% suggests investor enthusiasm may be outpacing fundamentals, echoing patterns seen during the dot-com era when cross-listed stocks traded at wide valuation gaps.
This article is for informational purposes only and does not constitute investment advice.
