A Chairman's First-Ever Share Purchase Sparks SK Hynix's Biggest Single-Day Jump in 17 Years

SK Hynix chairman buys shares for first time, triggering record rally despite weak Q2 guidance; stock still 42% below peak.

When a company's stock is down more than 40 percent from its peak despite record-breaking earnings, the usual playbook calls for investor days, guidance revisions, or perhaps a buyback program. SK Hynix chairman Chey Tae-won chose a more direct approach: he bought shares himself for the first time in his career.

The gesture was modest in scale — 3,620 common shares acquired on July 30 at the prior day's closing price of 1,322,000 won, for a total outlay of roughly 4.79 billion won, or about 3.3 million euros. But the signal was anything but small. By the close of trading on Friday, SK Hynix shares had surged 29.95 percent to 1,718,000 won, hitting the daily price limit on the Kospi exchange for the first time since January 2009.

A Deliberately Sized Purchase

Market observers were quick to note that the size of Chey's purchase was likely no accident. Had the transaction exceeded 5 billion won, the chairman would have been required to file a 30-day advance notice with regulators. By keeping the purchase just under that threshold, he was able to send his message immediately, without the customary waiting period. Many investors read the move as a statement of "responsible leadership" following weeks of heavy losses.

The timing of the purchase — and the market's explosive reaction — underscores just how far the stock had fallen. Even after Friday's historic rally, shares remain 42.48 percent below the 52-week high of 2,987,000 won reached in June. The rebound, in other words, is only beginning to repair the damage.

Record Profits That Failed to Impress

The sell-off that preceded Chey's intervention had its roots in an odd paradox: financial results that were spectacular on paper but still managed to disappoint. For the second quarter of 2026, SK Hynix reported a net profit of 93.92 trillion won — more than twelve times the year-earlier figure. Revenue climbed 257 percent to 79.32 trillion won, while operating profit surged 557 percent to 60.54 trillion won, pushing the operating margin to a record 76 percent.

Yet a significant portion of that net profit — 63.3 trillion won — came not from the core business but from revaluations and sales of equity stakes, most notably the company's holdings in Japanese chipmaker Kioxia. Analysts had also been looking for revenue closer to 84 trillion won, and the combination of missed estimates and questions about the sustainability of one-off investment gains weighed heavily on the stock. In U.S. trading, the shares fell 8 percent, and the Kospi briefly suspended trading for 20 minutes.

The underlying business, however, tells a different story. Gross margin came in at 83 percent, supported by a 30 percent increase in average DRAM prices. Management struck an optimistic tone for the second half of the year, pointing to continued tight supply in the high-bandwidth memory segment, where SK Hynix commands a 58 percent global market share. The company has also begun mass shipments of its HBM4 chips and, with roughly 88 trillion won in cash reserves at quarter-end, plans to expand production capacity at its Yongin and M15X facilities through 2027 to meet sustained AI-driven demand.

A Record Day for the Entire Market

Friday's surge at SK Hynix unfolded against an extraordinary session for the broader South Korean market. The Kospi composite index jumped 17.91 percent to 6,595.45 points — the largest one-day gain in its history. Foreign investors were net buyers of 7.24 trillion won in Kospi shares, a record, while retail investors sold a matching amount.

The rally was amplified by external catalysts. Microsoft's quarterly results, released earlier in the week, showed revenue of 90.01 billion dollars against a consensus estimate of 87.62 billion dollars, with Azure growth of 43 percent — easing concerns that Big Tech might be pulling back on AI infrastructure spending. Amazon added to the optimism by raising its 2026 investment forecast to 220 billion dollars.

Analyst Reactions and Competitive Pressures

The brokerage community has responded to the recent turbulence with mixed signals. UBS upgraded SK Hynix to "Strong Buy," while Barclays maintains an "Overweight" rating with a price target of 300 dollars on the U.S.-listed shares. The average consensus across covering firms stands at roughly 252 dollars for the ADRs.

Competitive dynamics remain a watchpoint. Chinese memory maker CXMT made its Shanghai debut on July 27, surging 470 percent and raising 12.56 trillion won. The company held an 8 percent share of the global DRAM market in the first quarter of 2026, compared with 29 percent for SK Hynix and 38 percent for Samsung Electronics. Analysts estimate CXMT trails by three to four years in technology, particularly in high-bandwidth memory products.

Labor relations add another layer of uncertainty. SK Hynix's union has rejected the company's proposal to pay more than half of bonus compensation in shares, objecting to wage adjustments during loss-making periods. The next round of negotiations is scheduled for the coming week.