A Chairman's 4.9 Billion Won Bet Preceded SK Hynix's Most Explosive Session in 17 Years

SK Group chairman's first-ever share purchase preceded a record 29.95% rally, signaling leadership confidence amid market turmoil.

The timing could hardly have been more dramatic. On Thursday, SK Group Chairman Chey Tae-won made his first-ever personal purchase of SK Hynix shares, acquiring 3,620 of them at an average price of 1,353,677 won. The following day, the stock hit its daily trading limit, surging 29.95 percent to close at 1,718,000 won — the sharpest single-session gain for the memory chipmaker since 2015.

That one-day swing translated into a paper profit of roughly 1.3 billion won on the chairman's package. But the move was less about personal gain than about sending a message during one of the most volatile weeks in recent memory for South Korean equities.

A Week of Whiplash

The Friday rally capped a stretch that saw the Kospi suffer its worst session on record, only to deliver its best. The benchmark index plunged 10.84 percent on Tuesday, triggering automatic trading halts on two consecutive days. By Thursday, forced liquidations of margin accounts had piled up to 103.8 billion won, the highest level in 14 trading sessions, with leveraged ETFs and credit trading amplifying moves in both directions.

Then came the reversal. The Kospi soared 17.91 percent to 6,595.45 points on Friday — the largest percentage gain in the index's history — after Microsoft posted surprisingly strong quarterly results and Amazon reaffirmed its AI investment plans, igniting a broad chip rally across US markets. Foreign investors bought Korean equities worth more than 7.2 trillion won net, while domestic retail investors sold a record roughly 8.27 trillion won. Samsung Electronics also hit a rally high, climbing 26.81 percent to 262,500 won.

Despite the explosive Friday session, SK Hynix shares remain down 32.89 percent over the past 30 days and still sit 42.48 percent below their 52-week high of 2,987,000 won reached in June. On a weekly basis, the stock is still off 2.33 percent.

A Signal From Leadership

Chey's purchase — totaling approximately 4.9 billion won — carried particular weight given the context. The chairman had already signaled his conviction at a forum on July 17, arguing that memory chips are in constant demand and advising investors to hold the stock rather than trade it. His Thursday buy-in, just hours before the historic surge, was widely interpreted as a demonstration of "responsible leadership" at a moment when many retail investors were squeezed by margin calls.

Samsung Electronics' leadership followed suit the same day. DX division head Roh Tae-moon purchased 3,045 shares for around 700 million won, bringing his total holdings to 124,280 shares.

Record Profits, Missed Expectations

The turbulence was triggered by a paradox: SK Hynix reported a record quarter, yet the numbers fell short of what the market had hoped for. Second-quarter revenue came in at 79.32 trillion won with operating profit of 60.54 trillion won — a 557 percent year-over-year surge driven by an operating margin of 76 percent, both all-time highs. But analysts had penciled in roughly 84 trillion won in revenue and 64 trillion won in operating profit.

The company attributed the shortfall to temporary delivery delays on certain high-bandwidth memory products and shifts in long-term supply contracts. The market responded with a sharp sell-off on Wednesday.

The balance sheet, however, tells a story of strength. SK Hynix now holds cash of 88 trillion won, up 33.6 trillion won from the previous quarter, yielding a net cash position of 69.4 trillion won. That liquidity supports an investment budget of at least $31 billion (approximately 48 trillion won) for 2026, with funds flowing into accelerated expansion of manufacturing clusters in Yongin and Cheongju. CEO Kwak Noh-jung has warned of a potential "memory crisis" in 2027, predicting the most severe supply shortage in industry history.

The company also completed a landmark US listing in early July, raising $26.5 billion through American Depositary Receipts on the Nasdaq — the largest amount ever raised by a foreign company in the United States. Proceeds are earmarked for next-generation manufacturing infrastructure and lithography equipment.

Competition on Two Fronts

The fundamental picture remains split. SK Hynix signed roughly ten long-term supply contracts with advance payments, pointing to sustained demand for AI infrastructure memory. DS Investment & Securities analysts note that historically, SK Hynix's share price peaks have tended to precede actual earnings peaks, suggesting potential upside into the first half of 2027, particularly as DRAM prices are expected to rise more sharply in the third quarter than previously anticipated.

Yet competitive pressures are building. Chinese rival CXMT has grown its DRAM market share from 3 to 8 percent within a year and plans to double manufacturing capacity by 2028. SK Hynix currently holds 29 percent of the DRAM market versus Samsung's 38 percent, but analysts project CXMT could reach 15 to 24 percent by the end of next year. Meanwhile, UBS analysts forecast that Samsung could overtake SK Hynix in high-bandwidth memory chips by 2027 with a 41 percent share, after SK Hynix leads with 48 percent in 2026.

SK Hynix is responding with rising equipment investment in the upper double-digit trillion-won range and an additional order of bonder equipment worth 42.2 billion won. Operationally, the company is balancing between two product lines, reportedly shifting resources toward conventional DRAM alongside ongoing HBM production, where it maintains a 50 to 60 percent market share. Acute shortages in standard DRAM have pushed margins in that segment to historically attractive levels.

Technical Stabilization

The charts suggest the worst of the panic has passed. The relative strength index stands at 44.7, indicating the stock has exited oversold territory without entering overbought conditions. The share price has reclaimed its 100-day moving average of 1,681,145 won, though it remains roughly 20.74 percent below the 50-day average. Year to date, SK Hynix is still up 164.43 percent — a reminder that even after a week of extreme swings, the longer-term trend remains firmly intact.