.6 trillion in 2026, as per Gartner's revised forecast in August 2026, up from its previous
.3 trillion estimate. Memory is expected to account for over 54% of this semiconductor revenue growth.
The Mechanism
The underlying cause of this market distortion lies in the intricate manufacturing of HBM4. High-bandwidth memory stacks DRAM chips vertically, connecting them with thousands of tiny through-silicon vias (TSVs) to provide AI processors with the necessary bandwidth. HBM4, the fourth generation, doubles the interface width from 1024 bits to 2048 bits, enabling greater bandwidth and capacity, as outlined by the JEDEC JESD270-4 standard in April 2025. However, this advanced architecture presents significant production challenges. HBM4 requires about three times more wafer space than standard DRAM for the same amount of memory, according to UncoverAlpha in January 2026. This leads manufacturers to reorganize existing HBM3, DDR4, and DDR5 memory lines into HBM4 production, which in turn reduces the supply of traditional RAM and creates bottlenecks across the broader memory market. A key technical hurdle for HBM4 is the adoption of hybrid bonding, which involves directly bonding copper-to-copper without micro-bumps to reduce thickness and power consumption. While crucial for the sub-10 µm pitches required by HBM4, hybrid bonding introduces new failure modes such as probe pad surface damage, voids, and misalignment, directly impacting stack-level yield. SK Hynix's senior director, Kim Ji-hoon, stated at a SEMI conference in September 2026 that the company would not adopt hybrid bonding unless it secures a minimum yield of 90% or higher and a lifespan of 3 to 5 years. This conservative stance highlights the inherent difficulties and the emphasis on process control for mass production.
Who is Exposed
The ramifications of the HBM4 bottleneck extend through the entire technology supply chain. AI chip designers, notably Nvidia and AMD, are directly exposed as their next-generation accelerators, such as Nvidia's Rubin architecture, are entirely dependent on HBM4 availability. Hyperscale cloud providers like Google, Amazon, and Microsoft, along with other major tech companies such as Meta, are aggressively investing in AI infrastructure, with Deloitte projecting their capital expenditure to exceed US
trillion in 2026. These companies are competing fiercely to secure HBM supply, with reports from UncoverAlpha in January 2026 indicating that major tech players are actively engaging with SK Hynix and Samsung to secure capacity. Furthermore, the diversion of manufacturing capacity to high-margin HBM products is creating a structural shortage of memory chips for the consumer electronics market. This shift exposes consumer device makers to severe price shocks and supply constraints, as traditional DRAM and NAND flash production is deprioritized.
Quantitative Outlook
The current market data, including the NASDAQ at 26,798 and the S&P 500 at 7,670.84 (see the table below), reflects a broader environment of sustained technology demand. IDC's April 2026 forecast projects total semiconductor revenues to reach
.29 trillion in 2026, with DRAM revenues nearly tripling to $418.6 billion. While SK Hynix held a dominant 50% share of the HBM market in Q2 2026 by revenue, according to Counterpoint Research, Samsung rapidly increased its share to 33% from 15% in Q2 2025. This demonstrates Samsung's aggressive push to regain ground after earlier challenges. Samsung commenced mass production of HBM4 in February 2026, utilizing its advanced 6th-generation 10 nanometer-class DRAM process. The company plans to increase its overall HBM production capacity to approximately 250,000 wafers per month by year-end 2026, with 80% dedicated to HBM4 and HBM4E. In September 2026, Samsung also unveiled a three-phase HBM roadmap at Hot Chips 2026, beginning with moving the HBM4 base die to a 4nm logic process. SK Hynix, meanwhile, secured its mass production system for HBM4 in September 2025 and began pilot operations at its M15X fab for HBM3E and HBM4 in May 2026. Goldman Sachs expects sequential price growth for HBM throughout the remainder of 2026, citing sustained supply tightness and a higher revenue contribution from HBM4 towards year-end. Analysts widely anticipate elevated pricing and tight allocation to persist through 2027, as new fabrication capacity lags behind demand. The critical indicators to watch remain yield rates for advanced packaging, particularly for hybrid bonding, and the pace at which both SK Hynix and Samsung can scale their HBM4 production reliably to meet the unrelenting demand from AI infrastructure. The battle for HBM leadership will dictate significant market share in the ongoing semiconductor supercycle.
Tags: SK Hynix, Samsung, HBM4, AI, Semiconductors
