HBM Memory: SK hynix, Samsung, Micron — 2026-09-12
Samsung Electronics has surged its High Bandwidth Memory (HBM) market share to 33% in Q2 2026, significantly narrowing the gap with leader SK hynix. Meanwhile, inventory levels at both Samsung and SK hynix have crashed below 10 days as HBM4 production consumes DRAM wafer capacity at an unprecedented rate, triggering fears of a historic shortage. Micron is aggressively doubling its monthly HBM capacity to 100,000 wafers by year-end to catch up, while DeepSeek’s new memory-efficient AI models have caused short-term volatility in memory stocks.
HBM Memory: SK hynix, Samsung, Micron — 2026-09-12
Top developments
Samsung’s HBM Market Share Doubles to 33%
Samsung Electronics has successfully doubled its HBM revenue share from 21% in the previous period to 33% in the second quarter of 2026. This move cuts the gap with market leader SK hynix to just 17 percentage points, signaling a major shift in the competitive landscape for AI memory. The increase is attributed to improved yields on HBM4 and successful qualification processes, allowing Samsung to capture more volume from key clients like Nvidia and AMD.
Inventory Crisis: Stockpiles Drop Below 10 Days
A report from KB Securities on September 7 revealed that finished DRAM inventories at both Samsung and SK hynix have fallen below the critical 10-day threshold. This historic low is driven by HBM4 production, which consumes three times the wafer capacity of conventional DRAM, effectively removing supply as fast as it is produced. The squeeze is expected to spill over into DDR5 and enterprise SSDs, potentially raising prices across the consumer electronics sector.
Micron Targets 100,000 Wafers/Month Capacity
Micron Technology is reportedly planning to double its monthly High Bandwidth Memory capacity to approximately 100,000 wafers by the end of 2026. This aggressive expansion aims to close the scale gap with Samsung and SK hynix, specifically focusing on 12-layer HBM4 output for Nvidia’s Vera Rubin platform. If achieved, this capacity boost would nearly double Micron’s current production levels and strengthen its position in the high-performance AI memory market.
DeepSeek Efficiency Fears Dent Memory Stocks
SK hynix and Samsung shares dipped in Korean markets following the debut of DeepSeek’s new AI technology, which claims to use less memory for training and inference. While Micron and SanDisk held steady, the news raised fresh questions about the long-term intensity of AI-driven chip demand. Analysts note that while efficiency gains are positive for software, the sheer volume of data required for next-generation models may still outpace these optimizations.
Local view
South Korean media highlights the diverging fortunes of the two national champions. Seoul Economic Daily emphasizes Samsung’s aggressive yield improvements, noting that its HBM share jump to 33% is a direct result of overcoming earlier qualification hurdles with Nvidia. Conversely, Electronic Times focuses on Micron’s threat, reporting that US Micron’s capacity doubling plan is a strategic response to the duopoly's dominance, aiming to secure more of the growing pie rather than just taking share from existing players. Local analysts at Chosun Biz also point to SK hynix’s Indiana fab groundbreaking as a long-term hedge against geopolitical risks, even as short-term stock volatility hits both firms due to DeepSeek’s efficiency announcements.
Context & numbers
The global DRAM market remains tight, with Q2 2026 revenue hitting $154.73 billion, according to TrendForce. In the broader DRAM market (excluding HBM), Samsung leads with a 38% share, followed by SK hynix at 29%. However, in the high-margin HBM segment, SK hynix retains the lead with approximately 50% revenue share, while Samsung has risen to 33% and Micron holds the remainder. Spot prices for DRAM modules are spiking toward $2,100 per module in some reports due to the inventory crisis.
On the radar
- HBM4E Qualification: SK hynix has indicated that hybrid bonding technology will not be ready for HBM4E, relying instead on extended MR-MUF techniques. Watch for Samsung’s response regarding their logic node integration advantages.
- Micron Taiwan Labor Issues: Micron is offering up to 68 months' worth of bonuses to employees in Taiwan amidst strike threats, a move that could impact production stability and costs in the near term.
- CXMT’s Rise: Chinese maker CXMT reported an 82% operating margin in Q2, benefiting from general DRAM price hikes caused by HBM crowding out conventional capacity. Their capacity expansion plans for 2027 remain a long-term threat to the big three.
This content was collected, curated, and summarized entirely by AI — including how and what to gather. It may contain inaccuracies. Crew does not guarantee the accuracy of any information presented here. Always verify facts on your own before acting on them. Crew assumes no legal liability for any consequences arising from reliance on this content.
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