SK Hynix at 4 Consecutive All-Time Highs, Samsung Drops Alone — Buy Case on ₩9T Foreign Selloff
Korea semiconductor exports are up 35% YoY. SK Hynix hit 4 consecutive all-time highs at ₩1,686,000 (+1.93%). Samsung Electronics fell -1.10% to ₩268,500. Foreigners dumped ₩9T+ from both combined. The divergence is driven by an HBM supply gap — and that gap closes when Samsung completes qualification.
On May 9, 2026, SK Hynix (000660) extended to a 4th consecutive all-time high at ₩1,686,000 (+1.93%). Samsung Electronics (005930) fell -1.10% to ₩268,500 on the same day. Foreigners net-sold ₩9 trillion across both names combined. This happened against the backdrop of Korea’s semiconductor exports rising 35% YoY.
Same memory cycle. Different price behavior. The divergence is worth unpacking — and it creates a buy case.
Why the Market Is Reading Them Differently
The single driver: HBM supply positioning.
SK Hynix has secured a dominant position in the high-bandwidth memory (HBM3E) supply chain for global data center operators. The market understands Hynix as the lead supplier for high-density memory modules used in leading data center GPU clusters. Samsung Electronics is understood to still be working through qualification for the same HBM3E spec at the same customers.
This framing produces the price divergence. Equal beneficiaries of the memory export boom — unequal multiples. The PBR gap between the two has widened beyond historical cycle averages.
The Buy Case
Qualification is a matter of when, not if. When Samsung completes HBM3E qualification, the multiple gap compresses. Position before the news.
Export data confirms the direction. Korea’s Ministry of Trade reports semiconductor exports up 35% YoY in 2026. The demand engine is data center memory and storage. Samsung’s DRAM commodity segments and NAND division are full beneficiaries of this cycle. HBM is not the only lever.
Foreign selling is profit-taking, not a signal. ₩9 trillion in outflows after Hynix’s 4-day ATH run is consistent with institutional profit-taking across both names. Selling from foreigners following a move like that reflects momentum, not a read on fundamentals. Foreign flows are not always directionally correct.
Samsung’s semiconductor division is recovering. Since H2 2025, the memory pricing cycle turned. Samsung’s DS (Device Solutions) division operating leverage is improving as DRAM and NAND prices rise. The HBM gap is one variable in a multi-variable improvement story.
Risks
HBM qualification delay is the single biggest risk. If Samsung cannot complete qualification by late 2026, the multiple gap persists or widens. Even after qualification, if Hynix’s market share position is structurally locked in, Samsung’s re-rating may be limited.
Samsung carries additional structural discounts unrelated to HBM: foundry business lagging TSMC; smartphone business margin compression. HBM qualification completion alone does not close all of that discount.
Following ₩9T in foreign outflows with a sell is chasing momentum, not price discovery. Supply and fundamental value operate on different timelines.