SK Hynix's Split Personality: A Record Buyback Meets a Market That Can't Make Up Its Mind

SK Hynix announces record $28.6B buyback after 50% drawdown, but stock still 42% below peak despite strong fundamentals and 257% revenue surge.

The numbers coming out of SK Hynix these days read less like a semiconductor company's financials and more like a psychological case study. A 13 percent single-day surge. A 50 percent drawdown in two months. A 167 percent gain since January. All of it happening to the world's leading supplier of AI memory chips — a business whose fundamentals, by most accounts, have never looked stronger.

The latest chapter in this saga arrived with the announcement of a record-breaking share buyback. SK Hynix said it would repurchase and cancel roughly 40 trillion won (about $28.6 billion) worth of its own stock — approximately 24 million shares, or 3.3 percent of all outstanding equity. It's the largest share cancellation in the history of South Korea's public markets, and the market responded with a double-digit jump. The stock now trades around 1,736,000 KRW, up 2.7 percent on the day and 5.5 percent on the week.

That headline, however, only tells part of the story. The buyback comes after a brutal stretch that saw the shares shed more than half their value in just two months, falling from an all-time high of 2,987,000 KRW set on June 25. Even after this week's rebound, the stock remains 42 percent below that peak — a gap that underscores just how violent the preceding selloff was.

A Market Trading Like a Derivative

What makes SK Hynix unusual isn't just the magnitude of the swings, but the way the stock behaves across different trading venues. At times, buyers of the company's US-listed shares have paid nearly 50 percent more than investors purchasing the same company's stock directly in Korea. That premium has oscillated between 16 and 51 percent since US trading began, settling recently at around 29 percent.

The disconnect has baffled even seasoned professionals. One portfolio manager described the cross-market mispricing as "absolutely crazy," adding he never expected the US to outdo Korea on volatility.

Part of the explanation lies in leverage. South Korea's Kospi index has fallen roughly 40 percent from its June high, prompting authorities to convene crisis meetings. Lawmakers have pointed a finger at leveraged single-stock products introduced in May as a contributing factor to the amplified swings. The result: SK Hynix's annualized 30-day volatility now stands at 146 percent — a figure more typical of an options contract on the AI investment cycle than a traditional chipmaker.

The Fundamentals Have Never Been Better

The buyback isn't happening from a position of weakness. SK Hynix ended the second quarter with net cash of approximately 69 trillion won. The company has also committed to returning more than half of its cumulative free cash flow to shareholders between 2025 and 2027, and JPMorgan expects additional capital returns of at least $130 billion through next year.

The operating numbers are equally striking. Revenue jumped 257 percent to 79.32 trillion won, while operating profit hit a record 60.54 trillion won, driven by explosive demand for high-bandwidth memory used in Nvidia's AI accelerators. Citi analyst Peter Lee sees the buyback as a crucial floor for the stock in the near term.

Yet even a monster quarter wasn't enough to satisfy the market. The subsequent selloff erased roughly $600 billion in market value in just over a month, transforming one of the world's hottest AI trades into one of its biggest question marks. Investors worry about crowded positioning and leverage-amplified volatility. The irony isn't lost on observers: record results no longer suffice when expectations are already orbiting in space.

JPMorgan, for its part, disputes the bubble thesis, saying it sees no fundamental signals pointing to meaningful weakness over the next six to twelve months. The stock still trades 35 percent above its 200-day moving average, with an RSI hovering near 50 — a market that simply can't decide which way to go.

A Two-Front Strategy

What sets this cycle apart from previous memory-chip downturns is the nature of the risks. SK Hynix today depends more heavily on the decisions of a handful of hyperscalers and on Nvidia's product roadmap than on traditional DRAM pricing. Long-term supply contracts should theoretically dampen volatility — but the stock's actual behavior tells a different story.

The company is simultaneously pursuing an aggressive expansion: 54 trillion won is being invested in new memory chip fabrication facilities, running in parallel with the buyback program. That dual-track approach — returning cash to shareholders while pouring money into capacity — reflects the unusual position SK Hynix finds itself in. The AI-driven memory boom has filled its coffers, but it has also made the stock a battleground for competing narratives about whether the AI infrastructure supercycle is sustainable or merely a leveraged excess waiting to unwind.

The buyback window runs through November and should provide ongoing support. But Thursday's 13 percent jump offers no definitive answer to the larger question. It's just the latest data point in a debate that extends far beyond SK Hynix — one that can reignite on any given trading day, in either direction.