Chairman Chey Buys SK Hynix Amid AI Market Swings

SK Hynix Inc. (000660:KS / SKHY:US) is one of the world’s leading semiconductor companies and the top supplier of high-bandwidth memory (HBM) used in AI accelerators. The company specializes in DRAM, NAND flash, and advanced memory solutions that power data centers, smartphones, and AI infrastructure. Headquartered in South Korea, SK Hynix has become a cornerstone of the global AI memory supercycle. 

Recent Insider Trades

Insider activity at SK Hynix showed notable buying in July 2026, led by a high-profile purchase from the group’s top leader:

• Chey Tae-won (Anthony) (Chairman of the Board) on July 30, 2026 purchased 3,620 ordinary shares at approximately 1,353,677 KRW per share for $3.431 million. This marks his first personal open-market purchase of SK Hynix shares, establishing a direct holding of 3,620 shares.

• Lee Seung Hwan (Group Director) on July 13, 2026 bought 22 ordinary shares at 1,952,000 KRW per share for $28,757, increasing his holdings to 70 shares.

The Chairman’s $3.43 million buy stands out as a clear signal of personal conviction.

Chey Tae-won’s purchase is particularly significant. Until now, he exercised control over SK Hynix mainly through SK Square (the largest shareholder) rather than holding shares personally. His first direct investment comes after years of building the company into an AI memory leader and shortly after SK Hynix’s landmark Nasdaq ADR listing. 

Ongoing Developments in the Korean Market

The Korean equity market has experienced extreme volatility in recent weeks, heavily driven by semiconductor stocks. Samsung Electronics and SK Hynix together account for a large portion of the KOSPI, and swings in AI memory sentiment have produced sharp daily moves, including a dramatic rebound that helped push the index higher after a steep prior decline.

Key ongoing themes:

• Massive US listing: In mid-July 2026, SK Hynix completed a blockbuster Nasdaq ADR offering, raising approximately $26.5 billion, the largest foreign company listing in US history. Shares experienced intense volatility (both in Seoul and on the ADR) due to arbitrage, profit-taking, and shifting AI sentiment.

• AI HBM leadership: SK Hynix continues to dominate the high-bandwidth memory market (over 50% share in key generations), benefiting from surging demand for AI data centers. Record profits have been reported, but the stock has also faced sharp pullbacks from peak levels.

• Market structure: Retail investors in Korea have poured significant capital into semiconductor names, amplifying volatility. Broader KOSPI moves remain highly sensitive to AI chip news and global tech flows.

Chairman Chey’s personal purchase occurred during a period of share price pressure following the US listing and subsequent market swings, positioning it as a vote of confidence in the long-term AI-driven growth story.