Direct:
Samsung (KRX: 005930) getting 12-layer HBM4E samples out the door on May 29 is a genuine industry first, and it complicates the reflex that SK Hynix (KRX: 000660) sets the pace on every memory generation. But sampling order is not the scoreboard that decides this year. The allocation being settled now is HBM4 for Nvidia's (NVDA) Vera Rubin platform, and SK Hynix already holds close to two-thirds of it, on roughly 57% of HBM revenue in Q3 2025 (Counterpoint) against Samsung's 22% and Micron's (MU) 21%.
HBM4E is the generation after, feeding the Rubin Ultra refresh that does not ramp until late 2027. Sampling a part that far out is mostly a signal to investors and the press, not a production commitment. The spec line also runs against the framing: Samsung's sample is rated 3.6 TB/s per stack at 16 Gbps, while SK Hynix's HBM4E carries 4.0 TB/s, a 38% bandwidth gain over HBM4.
The real move is SK Hynix pulling its own HBM4E sampling forward from a second-half guide to June or July at the latest, and the stock jumped about 7% on it. That timing change matters less than what HBM has always actually gated on, which is clearing Nvidia's certification at volume with yields that hold. SK Hynix carries the allocation lead because it has done that across HBM2E, HBM3, and HBM3E. Samsung has not yet matched that record.
For the consumer side: every wafer these three pour into HBM is one not making commodity DRAM, and HBM4 and HBM4E consume advanced packaging that would otherwise help DDR5 and the DRAM sitting next to your SSD controller. This race is upstream of what you pay for a drive.
Drafted with AI assistance against parallel reporting.
Sources:
- DigiTimes, June 15, 2026 (SK Hynix readies HBM4E samples for Nvidia)
- TechTimes, May 30, 2026 (Samsung ships industry-first HBM4E samples)
- TradingKey, June 2026 (SK Hynix accelerates HBM4E sampling; ~7% share move; 4.0 TB/s spec)
- TrendForce, January 2026 (SK Hynix to supply ~two-thirds of Nvidia HBM4)
- Counterpoint Research, Q3 2025 (HBM revenue share: SK Hynix 57%, Samsung 22%, Micron 21%)
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