HBM4 Rivalry Meets Nvidia Earnings: What It Means for Korea Chip Stocks
HBM4 Rivalry Meets Nvidia Earnings: What It Means for Korea Chip Stocks
Nvidia reports its fiscal second-quarter results after the US market close on August 26, and few storylines will be watched more closely in Seoul than what its guidance implies for the HBM supply chain. Samsung's HBM4 yield has climbed from below 60% in February to roughly 80% by August, a faster recovery than most analysts penciled in six months ago. SK hynix, meanwhile, still commands the largest share of the HBM market by most measures, even as that share has narrowed. Having watched several memory cycles compress and release since the 1990s, I think the more interesting question for institutional readers isn't simply whether Nvidia beats -- it almost certainly will clear a low bar -- but whether its commentary on HBM4 qualification timelines tips the competitive balance between Korea's two memory giants any further.
1. Where the HBM Market Actually Stands Today
Counterpoint Research's Q1 2026 DRAM and HBM market share data shows SK hynix holding roughly 58% of HBM revenue, down from 69% in the same period a year earlier. Notably, Samsung placed third in that quarter -- behind Micron -- underscoring how competitive the race for the number-two position has become even as SK hynix retains outright leadership.
It's worth flagging a methodology note here: different research houses measure HBM share differently -- some by revenue, others by bit-capacity shipped -- and the resulting figures can diverge meaningfully. TrendForce's bit-capacity-weighted estimates put Samsung's share meaningfully higher than Counterpoint's revenue-based figures for the same period. Rather than collapsing these into a single number, we preserve both ranges: Samsung's 2026 HBM share is estimated at roughly 20-40% depending on methodology.
2. Samsung's HBM4 Yield Climb Is the Story Underneath the Headline
The more consequential development, in my view, isn't a single quarter's share print -- it's the trajectory of Samsung's HBM4 yield. TrendForce's HBM Market Bulletin, updated August 10, reports that Samsung's HBM4 yield has climbed to approximately 80%, up from below 60% when mass production began in February. Samsung had reportedly targeted 80% only by year-end, meaning the actual pace of improvement has run ahead of its own internal roadmap.
TrendForce's earlier June bulletin attributed this shift to diverging HBM4 certification timelines: Samsung completed validation first and began shipments in the second quarter, securing a position on Nvidia's Rubin platform, while SK hynix faced interface synchronization issues that pushed its own mass production into the third quarter. That is a meaningfully different picture from just a few months ago, when SK hynix was expected to retain an uncontested lead through the HBM4 transition.
3. What Nvidia's Earnings Could Confirm -- or Complicate
Nvidia's prior-quarter revenue of $81.6 billion beat street estimates by roughly $2.5 billion, and expectations for this report remain elevated. For Korea's chip sector specifically, the number that matters less is the top-line beat itself and more what management says about HBM4 qualification pacing across its supplier base. If Nvidia's commentary signals that Samsung's HBM4 volumes are being absorbed into near-term allocation rather than treated as a 2027 story, that would be read as confirmation that Samsung's yield gains are translating into real orders -- not just a manufacturing milestone.
4. Pricing Power: Why Memory Supply Constraints Cut Both Ways
Reports that Nvidia has notified major customers of price increases exceeding 15% on next-generation products for 2027 reinforce the view that memory supply will remain tight well beyond this earnings cycle. That dynamic supports pricing power for SK hynix and Samsung alike, but it is not a one-directional positive: the same supply constraint is compressing margins for PC and smartphone OEMs further down the value chain, a tension worth tracking into year-end.
| Metric | SK hynix | Samsung |
|---|---|---|
| Q1 2026 HBM revenue share (Counterpoint) | ~58% | ~20% (3rd place) |
| HBM4 certification status | Delayed to Q3 2026 (interface sync issues) | First to validate, shipping since Q2 2026 |
| HBM4 yield trajectory | Not separately disclosed | <60% (Feb) → ~80% (Aug) |
| 2027 target | Retain overall leadership | Double HBM shipments YoY |
5. Market Outlook: Base Case and Key Risks
What follows is a probabilistic read of where the data points, not a directional prediction.
The base case, and the more probable of the two given current data: Nvidia's guidance confirms that AI-chip demand remains structurally undersupplied, which sustains HBM pricing power for both Korean suppliers. Samsung's rising HBM4 yield gradually converts into a larger qualified allocation from Nvidia, narrowing -- without closing -- the gap with SK hynix. Both companies post historically strong operating profit for 2026, with Samsung's memory segment estimated near 80 trillion won and SK hynix's overall operating profit near 50 trillion won, per single-source industry estimates that should be treated as directional.
The risk case worth taking seriously: Nvidia's valuation is already elevated enough that even an in-line beat could trigger profit-taking across the AI supply chain, Korea included. Samsung's TC-NCF packaging process has historically been a weak point, and while yields have improved faster than expected, a stall is not out of the question given how compressed the improvement curve has already been. Separately, memory price increases -- driven by the same HBM supply constraints benefiting Samsung and SK hynix -- are squeezing PC and smartphone OEM margins, a dynamic that could eventually dampen the broader demand base these suppliers depend on.
6. Looking Ahead to September
Beyond this week's earnings cycle, the next checkpoints for Korea's chip trade cluster around the September FOMC meeting and third-quarter earnings previews for both Samsung and SK hynix. The table below maps this week's catalysts to what follows.
| This Week | September Follow-Through |
|---|---|
| Nvidia FQ2 earnings (Aug 26) | Sets tone for Korea Q3 earnings preview season |
| Samsung HBM4 yield data (~80%) | Watch for Q3 allocation confirmation from Nvidia/hyperscalers |
| SK hynix HBM4 delay to Q3 2026 | Mass production ramp progress reports expected |
| US July PCE (Aug 26) | Input into September FOMC rate decision |
7. Basic Investment Principles
Korea's HBM story is best approached as a diversification component within a broader semiconductor or AI-infrastructure allocation rather than a concentrated bet on either single supplier. SK hynix and Samsung respond to different catalysts within the same cycle -- certification timelines, yield curves, and customer qualification processes that can move independently of each other even when the broader demand backdrop is shared. As always, maintain a long time horizon and avoid overweighting any single earnings print or yield-rate headline in isolation from the broader capital-cycle trajectory.
This article is published for informational and analytical purposes only. Nothing contained herein constitutes financial, investment, legal, or tax advice. All investment decisions involve risk, including the possible loss of principal. Past performance is not indicative of future results. Readers should conduct their own research and consult a qualified financial advisor before making any investment decisions. The views expressed are solely those of the author based on publicly available information and do not represent the official position of SEJONG DnC.
8. Sources
- Counterpoint Research, "Global DRAM and HBM Market Share," Q1 2026 data
- TrendForce, HBM Market Bulletin, June 23, 2026
- TrendForce, "Samsung's HBM4 Yield Reportedly Hits 80% as HBM Race Heats Up," Aug 10, 2026
- Seoul Economic Daily, coverage of Nvidia FQ2 FY2027 earnings schedule, Aug 2026
- ICN Magazine, memory sector 2026 operating profit estimates, March 2026 (single-source estimate)
- Wisdom Korean Finance archive, "The Memory Line Item: How HBM Rewired the $725B Hyperscaler CapEx Stack," Aug 14, 2026
Comments
Post a Comment