Samsung's HBM4 Turnaround Could Redefine the Memory Race

Samsung Is Finally Beating Its Own Shadow

For years, Samsung Electronics carried a quiet penalty in memory markets. Its general-purpose DRAM was industry-leading, but its high-bandwidth memory business — the critical component powering AI accelerators — lagged rivals in both customer certification speed and production yields. That gap became a discount on Samsung’s stock, a recurring theme in analyst reports and earnings calls alike. Investors watched Samsung dominate the commodity side of memory while SK Hynix captured the premium AI segment, and the market priced that divergence accordingly.

A research note from LS Securities on September 1, 2026, offers the clearest signal yet that the gap may be closing faster than expected.

The data point to watch: Samsung’s HBM4 shipments rose from roughly 5% of total HBM volume in the first quarter of 2026 to approximately 35% by the second quarter. That is not a gradual ramp. It is a structural shift compressed into a single quarter, and it happened alongside an estimated improvement of more than five percentage points in blended HBM yield.

What makes this notable is the comparison analysts are already drawing internally. During the HBM3E ramp, Samsung struggled to convert lab yields into factory-scale production. The company could demonstrate strong results in controlled test environments but faltered when scaling to volume manufacturing — a pattern that repeated across multiple quarters and eroded customer confidence. HBM4, released just months later, appears to have sidestepped that trap entirely. According to LS Securities researcher Jeong Woo-sung, Samsung is securing comparatively high mass-production viability on HBM4 from an earlier stage — something that did not hold true two generations ago. The implication is that Samsung’s process engineering and quality-control improvements across its Pi 3 and beyond nodes are finally translating into HBM-specific gains, rather than remaining confined to general-purpose DRAM lines.

Who Wins and Who Loses

The immediate winner is Samsung itself. A higher HBM4 mix with improving yields means each additional unit of HBM revenue contributes more to Samsung’s bottom line than it would have at earlier mix levels. HBM carries gross margins significantly above general-purpose DRAM, and as the product mix tilts toward HBM4 with better yields, the profit contribution per wafer accelerates non-linearly. Jeong’s report suggests that if blended yields continue to climb alongside the HBM4 share, the speed at which memory business profits flow through to corporate earnings could exceed prior estimates — potentially compressing the timeline for Samsung’s memory segment to return to pre-cycline profitability levels.

That dynamic also matters for Samsung’s valuation. The company’s memory segment has historically been the engine of its profit profile, with general-purpose DRAM as the workhorse. But HBM is where the margins are expanding fastest, and where the long-term demand trajectory points. If HBM4 begins contributing meaningfully to overall profitability, Samsung’s profit structure shifts from a DRAM-centric model toward a higher-margin AI memory mix — a re-rating catalyst that general market participants have been waiting for. The memory discount on Samsung’s shares, which has persisted for multiple years, could narrow in a way that benefits not just the semiconductor division but the conglomerate’s overall cost of capital.

SK Hynix remains the incumbents’ benchmark. The company has held the lead in HBM shipments and AI memory partnerships for both HBM3 and HBM3E, anchored by deep relationships with NVIDIA and other leading AI accelerator designers. Samsung’s acceleration does not overtake SK Hynix overnight. But it does narrow the perception gap — and in semiconductor stocks, perception drives multiples as much as fundamentals. Even a modest shift in how the market views Samsung’s competitive position in HBM can produce outsized effects on valuation, independent of whether Samsung has fully closed the volume gap.

Micron faces a different question. Its HBM4 roadmap is less advanced in current public timelines, and it has not demonstrated the same kind of rapid mix shift. Micron’s position in the HBM market has always been more precarious, and Samsung’s progress adds pressure on three fronts: competitive displacement in existing customer accounts, margin compression as supply constraints ease, and the risk that cloud providers diversify their second-source strategy toward Samsung rather than Micron. If Samsung continues gaining ground, the competitive narrative in HBM4 could move from a two-company race to a three-way scramble — with Samsung no longer the laggard in the story.

The Supply Story Is Changing

Memory supply remains constrained across the sector. Demand from AI data centers continues to outpace the rate at which new capacity can come online, and HBM-specific manufacturing — which requires specialized TSV (through-silicon via) processes and advanced packaging — is even tighter than general DRAM capacity. But LS Securities flags a subtler shift: as memory becomes a larger share of server budgets, there is less room for unchecked price increases without pushing buyers toward alternatives or design changes. Price upside may be more limited than in previous cycles, which means margin expansion will increasingly depend on yield and mix rather than raw pricing power.

That makes the supply narrative less about prices and more about who can deliver volume at acceptable yields. Samsung’s HBM4 progress is therefore strategically significant beyond its own financials. It changes the calculus for customers who previously had few viable second-source options for high-volume HBM4 procurement. NVIDIA’s reliance on a single HBM supplier has been a recognized supply-chain risk, and Samsung’s emergence as a credible alternative gives those relationships more balance — and gives Samsung leverage in negotiations that it lacked during the HBM3E cycle.

For Samsung’s leadership, the timing matters too. The company has invested heavily in memory capital expenditures through 2025 and into 2026, including significant spending on advanced packaging capacity and HBM-specific process upgrades. Rising yields on HBM4 mean those expenditures start converting into profitable output sooner rather than later. The alternative — continued yield struggles on next-generation products — would have extended the period of capital-intensive output with thin returns, further widening the gap between Samsung and its Korean rival. Every quarter of delayed HBM4 profitability represents not just missed earnings but a widening perception gap that is costly to close.

There is also a second-order effect on Samsung’s broader semiconductor strategy. HBM success strengthens the case for continued investment in foundry and custom-memory solutions, which could accelerate internal debates about resource allocation between the Foundry and Memory Device divisions. If HBM4 becomes a sustained profit driver, it reinforces the argument for prioritizing memory over foundry in capital allocation — a shift that could reshape Samsung’s industrial strategy for years.

What Happens Next

LS Securities raised its target price for Samsung Electronics from 400,000 won to 450,000 won while maintaining a buy rating. The revision is modest in percentage terms but meaningful in direction. It signals that at least one major Korean broker now views Samsung’s HBM trajectory as a durable improvement rather than a temporary inflection. That classification matters: a temporary inflection invites fade trades, while a durable improvement invites position-building.

Two variables will determine whether this holds.

First, whether blended yields continue improving as HBM4 share rises further. The Q2 data shows movement, but one quarter of progress does not establish a trend. Samsung needs to demonstrate that the yield curve does not flatten as volume scales — a common failure point in semiconductor ramps where early lots behave differently than production runs. If yields stall, the mix shift alone will not deliver the margin expansion that the current narrative prices in.

Second, whether HBM4 demand from new AI customers expands at the pace implied by the shipment mix data. Current figures show Samsung moving a meaningful share of HBM4 into existing accounts. Broader customer acquisition — particularly among major cloud providers and AI chip designers who have historically favored SK Hynix — would validate the trajectory and signal that Samsung has broken through the certification barrier that previously held it back.

A third variable deserves attention: the behavior of general-purpose DRAM prices. If memory demand softens on the commodity side while HBM remains tight, Samsung’s overall memory margin profile could become even more dependent on HBM execution. That concentration risk cuts both ways — strong HBM performance amplifies profits, but any stumble becomes proportionally more damaging.

If both primary conditions persist, Samsung’s memory business could deliver a compound effect: higher mix, better yields, faster profit conversion, and a shrinking valuation discount. That sequence, played out over the next four to six quarters, would be the most significant restructuring of Samsung’s memory narrative in a decade — and the closest the company has come to neutralizing the structural discount that has weighed on its shares since the HBM3 cycle began.