SK Hynix Retreats as Foreign Money Exits and Samsung Closes the HBM Gap

SK Hynix slid 2.1% to 1,803,000 KRW after a 3.5% drop, as foreign investors sold and Samsung closed the HBM gap.

Two down days, two different headlines, one underlying story. SK Hynix has now given back ground in consecutive sessions, and the reasons stretch well beyond the usual pre-earnings jitters. On the latest trading day the stock shed 2.1% to close at 1,803,000.00 KRW, making it one of the heaviest drags on South Korea's benchmark KOSPI. That followed a sharper 3.5% slide in the prior session, which left the shares at 1,776,000.00 KRW.

The mechanics of the pullback are not hard to trace. Weakness in US memory chip names spilled across the Pacific, with Micron Technology dropping 1.0% overnight and the US-listed receipts of SK Hynix also trading lower. Not even a record close for Nvidia on Wall Street was enough to shield the pure-play memory makers from the downdraft.

Foreign investors have been the driving force behind the selling. Net offshore sales in SK Hynix between September 1 and October 2 reached 12.009 trillion KRW, according to media reports, as international funds locked in profits after a spectacular run. The foreign ownership share has fallen to its lowest level since May 2023. Even after the recent retreat, the stock is still up 178% year to date — a gain that had reached 173% before the latest bout of weakness.

A Shifting Competitive Landscape

The more consequential question for investors is whether SK Hynix's long-held edge in high-bandwidth memory is starting to erode. For months the company's dominance in cutting-edge AI storage looked untouchable. Samsung Electronics, however, is closing fast. Counterpoint Research puts SK Hynix's HBM revenue share at 50% in the second quarter of 2026, with its rival now at 33%.

The generational handover is proving equally delicate. Bernstein recently cut its price target on the stock to 2.7 million Won, citing delivery problems with HBM4 and a slower-than-hoped transition away from the established HBM3E architecture. Major customers continue to clamor for the older memory while new platforms take time to ramp. Bernstein expects HBM to be less profitable than conventional DRAM by 2027, a prospect that could squeeze margins across the industry's leadership tier.

Macro Headwinds Add to the Pressure

Broader forces are compounding the sector-specific worries. Rising US Treasury yields have revived global rate concerns, while the won's appreciation against the dollar is weighing on export earnings expectations. The exchange rate, which stood above 1,500 Won in the second quarter, has settled around 1,344 Won.

Meanwhile, the calendar itself is a source of tension. Samsung Electronics is due to publish preliminary figures in the coming days, with SK Hynix following later in the month.

Management Presses Ahead on Capacity

None of this appears to have rattled the boardroom. Far from tapping the brakes, SK Hynix is accelerating its expansion. On Tuesday the company disclosed that its estimated construction order volume with subsidiary SK ecoplant for the fourth quarter of 2026 will be raised to 4.2462 trillion Won — 61.5% more than the figure penciled in back in February. More than 4 trillion Won of that will flow directly into new semiconductor fabs, and the company is switching the arrangement entirely to cash settlement.

The bet is clear: management expects the shortage of advanced memory to persist well into next year, and long-term supply agreements plus full order books currently back that view.

Solidigm Questions and a Technology Roadmap

Company-specific developments have also drawn attention. Roughly a week ago DS Securities trimmed its expectations for SK Hynix, after which the shares added 2.2%. On October 1 the company addressed speculation surrounding its subsidiary, stating that no decisions have been made regarding Solidigm's capital plans. Any potential financing step, it said, will be carefully weighed for its impact on existing shareholders and long-term corporate value.

At the same time, the technology roadmap continues to advance. At TSMC's OIP conference on September 28, SK Hynix presented its next-generation memory portfolio for AI applications alongside its development plans. According to South Korean media, the validation of HBM5 with TSMC took center stage.

For a business that has historically been battered by brutal boom-and-bust cycles, the scale of this investment push raises an obvious question. The market, for now, is pricing in a more mature phase of the AI cycle, one defined by stiffer competition. The stock trades 41% below its 52-week high — a gap that says as much about expectations as it does about fundamentals.