Shares of SK Hynix's American depositary receipts tumbled 7.94% Thursday morning, falling $14.01 to $162.44, extending one of the more volatile stretches Wall Street has seen from a newly listed stock as the South Korean memory chipmaker continues to whipsaw investors just over a week after its blockbuster Nasdaq debut.

Thursday's decline followed a previous close of $176.46 and adds to a dizzying sequence of swings that has defined SK Hynix's trading since it began listing its ADRs on the Nasdaq on July 10. The stock jumped 13.1% on its opening day, only to fall 9.32% the following Monday to $152.35, before surging 27% Tuesday to $193.92, then sliding roughly 5% Wednesday to $184.50, and now dropping again sharply Thursday. The pattern has left the ADR trading well below both its recent peak and its debut-week highs, even as it remains above its initial public offering price of $149.

The volatility has coincided with an even sharper rout in SK Hynix's Seoul-listed shares. South Korea's Kospi index tumbled again Thursday, extending a sharp selloff that saw the benchmark fall further after chip stocks overshadowed a wave of otherwise strong regional earnings reports. On the Korean exchange, SK Hynix shares slid more than 11% Thursday to 1,847,000 won, reversing the prior session's sharp rally, according to data tracked by Investing.com. That decline followed an even more severe drop earlier in the week, when SK Hynix's Seoul-listed shares plunged 15.4% on Monday, marking the largest........

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