SK hynix's stock experienced a significant decline of 5.01% during the after-hours session, marking a sharp reversal from its earlier performance. The memory chipmaker's shares had surged approximately 27% in the previous regular trading session, reaching record highs following its U.S. listing as an American Depositary Receipt (ADR).
The plunge is primarily attributed to investors locking in profits after the dramatic intraday rally. Market analysts point to compression of the stock's significant premium as a U.S.-listed ADR over its underlying South Korean shares as a key factor driving the sell-off. The ADR premium had ballooned to over 50% compared to local shares, creating selling pressure and arbitrage opportunities that contributed to the after-hours pullback.
Structural constraints in the arbitrage mechanism between the two markets have prevented normal price convergence, while regulatory developments may have added to the selling pressure. Korean brokers have agreed to tighten investor protections for single-stock leveraged ETFs tracking SK Hynix, which could affect trading dynamics. Additionally, options activity showed notable bearish positioning, with a $3.17 million purchase of long-dated put contracts signaling cautious sentiment among some investors.
