SK Hynix's 22.63% Friday Surge Caps a Month of Whiplash — But the Hard Questions Linger

SK Hynix rebounds 22.6% after Nvidia partnership and strong Azure results, despite record Q2 earnings marred by one-off gains and ADR premium.

A single session has rewritten the narrative for SK Hynix. The South Korean memory-chip giant closed Friday at 1,718,000 won, a 22.63% jump that ranks among the most explosive trading days in its history. The rebound claws back a meaningful slice of the 32.89% the stock shed over the prior month — a stretch that had wiped out nearly a third of the company's market value and left investors questioning whether the AI trade had finally run its course.

Two catalysts, one direction

The trigger came from an unlikely pairing. Microsoft's better-than-expected quarterly results showed Azure cloud revenue expanding 43%, easing fears that hyperscalers might pull back on AI infrastructure spending. That mattered enormously for SK Hynix, whose high-bandwidth memory (HBM) chips sit inside virtually every AI accelerator powering modern data centers. If cloud providers can convert AI investment into revenue, the logic goes, demand for SK Hynix's memory products follows.

The second catalyst was more direct: official confirmation of a multi-year partnership with Nvidia for next-generation AI memory chips. The deal, part of a broader $500 billion-plus initiative for AI factories and memory development, cements SK Hynix's position as Nvidia's primary HBM supplier.

A record quarter that confused the market

The rally follows one of the most paradoxical earnings reports in recent memory. On July 29, SK Hynix posted second-quarter 2026 results that were historic by any measure: revenue climbed 257% to 79.32 trillion won, while operating profit surged 557% to 60.54 trillion won, pushing the operating margin to 76%. Yet the stock initially sold off because revenue slightly missed the consensus estimate of roughly 84 trillion won, and operating profit came in about 5% below the 64 trillion won analysts had penciled in.

The report contained one detail that generated particular scrutiny: net income of 93.92 trillion won actually exceeded total quarterly revenue. That unusual discrepancy stems from a one-off gain of roughly 63.3 trillion won tied to the revaluation and sale of SK Hynix's indirect stake in Kioxia, the Japanese flash-memory maker. The special item flattered the headline numbers while masking a modest shortfall in the core business, where HBM4 delivery delays and capacity-expansion costs weighed on results.

The ADR puzzle that won't go away

A separate structural quirk continues to occupy investors. SK Hynix's American Depositary Receipts, which debuted on the Nasdaq on July 10, have traded at a persistent premium to the Seoul-listed shares. That gap peaked at 51% in mid-July before narrowing to roughly 21% by Friday. The premium persists because SK Hynix caps ADR conversions at 2.5% of outstanding shares — a quota that is already fully exhausted — and the conversion mechanism runs one way only. ADRs can be exchanged back into Seoul shares, but not vice versa, which prevents arbitrageurs from closing the gap entirely.

Bulls and bears both have ammunition

The bull case rests on SK Hynix's commanding position in the most profitable corner of the memory market. The company remains the dominant supplier for Nvidia's AI accelerators, and its long-term supply agreements with more than ten major customers — including global hyperscalers and strategic partners like Nvidia — typically run five years, designed to stabilize pricing against the memory industry's notorious boom-bust cycles. The SK Group's broader AI infrastructure initiative, valued at $750 billion, adds another layer of long-term visibility, with HBM4 mass production already underway since the second quarter.

Adding to the confidence signal: SK Group Chairman Chey Tae-won recently purchased 3,620 shares worth approximately 4.9 billion won. The stock's year-to-date gain of 164.43% underscores how handsomely the market has rewarded the company's profitability.

The bear case is equally well-armed. The annualized 30-day volatility stands at a staggering 152.53%, a figure that speaks to an environment of violent swings. The missed quarterly revenue shows how even minor delays in HBM delivery recognition can dent the stock, and the aggressive capital expenditure plan of nearly 50 trillion won for 2026 raises the stakes on execution. Despite Friday's surge, the stock remains 20.74% below its 50-day moving average — the medium-term trend has not yet been reclaimed.

What comes next

The stock still trades roughly 42% below its June record high of 2,987,000 won (the secondary source puts the exact gap at 42.48% from the year high). The 50-day average of 2,167,507.68 won represents the next technical hurdle should the rally extend, while a relative strength index of 44.7 suggests room to run without entering overbought territory. The 200-day average sits 45.43% above the current price.

Near-term attention will focus on whether the stock can hold above 1,700,000 won, the pace of HBM4 production ramp-up, and progress at the planned packaging facilities in Indiana and the semiconductor cluster in Yongin. Updates on chip qualification and the new M15X production line could provide the next catalysts, along with continued net buying from foreign and institutional investors. With no earnings on the immediate horizon, the market's verdict on whether Friday marked a genuine turning point — or merely a violent reflex to sector sentiment — will depend on execution data, not promises.