SK Hynix stock jumps over 6 percent as chip rally lifts KOSPI

Published on 09/18/2026 at 14:35 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

SK Hynix stock climbed 6.42 percent to KRW 1,857,000 on September 18, 2026 as chipmakers rallied with lower oil prices and yields. The ADR also traded higher in the US, underscoring strong global demand for semiconductor plays.

SK Hynix, KR7000660001, Illustration mit AI erstellt.

SK Hynix stock (ISIN KR7000660001) delivered a strong move on September 18, 2026, closing at KRW 1,857,000 on the Korea Exchange, up 6.42 percent from the previous session according to Barrons.

Chip rally drives SK Hynix higher

As global technology stocks rallied on easing oil prices and lower Treasury yields, SK Hynix stock surged 5.6 percent intraday to KRW 1,843,000 before settling at KRW 1,857,000, marking a decisive recovery from recent declines, according to Investing.com on September 18, 2026.

In morning trading the same day, SK Hynix shares were up 4.38 percent at KRW 1,821,500, helping drive the KOSPI index higher, as reported by Chosun on September 18, 2026.

SK Hynix as a key index driver

By the regular close on September 18, 2026, SK Hynix ended the session 6.42 percent higher at KRW 1,857,000, making it one of the strongest contributors to a 2.68 percent gain in the KOSPI, according to TradingKey.

Foreign investors turned net buyers of SK Hynix for the first time in seven sessions, with the stock closing at KRW 1,857,000, up 6.42 percent versus the prior day, as highlighted by News1 on September 18, 2026.

ADR performance adds an international angle

In the United States, the American Depositary Shares of SK Hynix traded on Nasdaq under the ticker SKHY also moved higher, with the stock up 4.6 percent during mid-day trading on September 17, 2026 and last changing hands at USD 182.99, after reaching an intraday high of USD 185.33, according to MarketBeat.

The next day, SK Hynix ADRs appeared among premarket gainers at USD 186.27, up 1.79 percent, underlining continued international interest in the name, per PremarketPrice on September 18, 2026.

Closing price and trading context

As of the regular close on September 18, 2026, SK Hynix stock on the Korea Exchange traded at KRW 1,857,000, representing a gain of KRW 112,000 or 6.42 percent versus the prior close, based on data cited by Barrons.