On July 15, Korea’s securities depository confirmed something investors had been waiting weeks for: starting July 29, SK Hynix’s Nasdaq-listed ADR and its Seoul-listed shares will finally be allowed to convert into each other. Until now, the ADR price gap between the two listings had ballooned to over 50% — the exact same company, priced completely differently, ten time zones apart.
Picture two towns that sell the identical product, connected by a single toll bridge. If the gate is open, nobody pays 50% more on one side, because anyone can just walk across and buy it cheaper. But if the gate is locked, the two towns’ prices can drift apart for as long as the gate stays shut — no matter how strange the gap looks from the outside.
That’s exactly what happened here. On paper, buying the cheaper Seoul shares and converting them into the pricier Nasdaq ADR should have been close to free money. In practice, the gate was locked: Korea’s depository confirmed that real conversion requests can’t even be filed until July 29, once the new underlying shares finish listing back in Seoul.
Even once the gate opens, it won’t swing both ways equally. Converting the ADR back into Seoul shares will have no cap. But converting Seoul shares into the ADR is capped by how much of the ADR program is still unissued — so the flow runs more freely in one direction than the other. This is actually the same setup TSMC uses, where one direction is open and the other needs approval — very different from ASML, whose bridge is open both ways and whose US and home-market prices barely differ at all.
One more wrinkle: even after July 29, this bridge is mostly for institutions. Ordinary retail investors don’t get an easy walkway across — the paperwork runs through custodian banks and foreign-exchange reporting that most individual accounts simply can’t do.
My take: Price gaps don’t close themselves — they close when the door does.
Not advice. Just how I see it.