The global market for semiconductor memory—particularly DRAM and its high-performance derivative, High Bandwidth Memory (HBM)—has consolidated into a remarkably concentrated oligopoly. Three firms—Samsung Electronics, SK Hynix, and Micron Technology—collectively command the overwhelming majority of production. Indeed, together they control over 95% of DRAM supply 8,52,55 and approximately 95% of the HBM segment 15,38. In the most advanced frontier of HBM4, they stand as the sole producers 2,4,10,17,27,34. This level of concentration is not a passing condition but an organic feature of an industry with immense barriers to entry and strong learning-by-doing effects, a structure that naturally confers substantial pricing power on the participants 49.
The distribution of market share within this triad is instructive. SK Hynix has established a commanding lead in HBM, with estimates placing its share between 57% and 62% 1,4,7,12,13,14,19,20,22,23,28. Samsung Electronics follows with a range of 17–22%, while Micron holds roughly 21% 1,13,14,20,22. SK Hynix’s advantage derives from early and sustained investment during cyclical downturns 20, and it supplies the majority of HBM for Nvidia’s graphics processing units 11,34,44. The strategic significance of this concentration extends beyond the semiconductor sector: Samsung and SK Hynix together account for over 50% of the KOSPI index’s capitalization 17,21,29,56, and they are central to South Korea’s ambitious $576 billion national AI investment programme 45,48.
The market valuations of these firms reflect the scale of the AI-driven opportunity. At times, their combined market capitalizations have reached trillion-dollar thresholds 6,9,19, often accompanied by sharp share price fluctuations—sharp declines on certain dates 18,29,43,51 contrast with record highs at others 26. This volatility underscores the sensitivity of expectations to the evolving demand picture.
Short-Run Constraints and the Temporal Dimension of Supply
We must be careful to distinguish between the immediate supply conditions and the longer-term capacity adjustments that are already in motion. In the short run—a period in which fabrication facilities are fixed—the HBM market faces pronounced scarcity. Leading producers have cautioned that shortages could persist through 2027 and beyond 30, and by early 2026, all production capacity for that year was already committed 30. Indeed, the industry has reached a point where capacity is fully booked through 2028 36. This tightness is compounded by a deliberate reallocation of manufacturing resources: as firms shift wafer starts from conventional DDR memory to the higher-margin HBM products 33,55, the available supply of general-purpose memory contracts.
The effects are already visible in pricing. The reallocation has been interpreted by some observers as a coordinated effort to restrict DDR supply, thereby elevating prices for a broad range of consumer electronics 25,32,41. Whether this represents a natural response to demand signals or a form of tacit collusion is a question currently under legal scrutiny. Class-action lawsuits have been filed alleging that the three producers used the transition to HBM as a pretext to curtail DDR3 and DDR4 output, thereby fixing prices 25,32,37,55. The gravity of these allegations is heightened by the historical record: Samsung and SK Hynix were previously convicted of DRAM price fixing in 2005 31,55.
But the long-run picture is more complex. All three firms are engaged in substantial capacity expansions. SK Hynix, for example, plans to double its wafer capacity 3,5,39, and significant capital expenditure is evident across the oligopoly 16,33,46,47,50. These investments, however, take time to mature; the new supply is not expected to materially ease market tightness before 2028 40,42. The temporal lag between investment and output is a critical parameter in the memory cycle, and it dictates that end users must navigate several years of strained allocation.
Alphabet’s Position as a Strategic Buyer
For a hyperscaler such as Alphabet Inc., which deploys custom Tensor Processing Units (TPUs) and operates massive data centres, these dynamics are far from abstract. Alphabet is a substantial consumer of HBM and DRAM, and its access to advanced memory—as well as the prices it pays—is heavily influenced by the decisions of the three dominant suppliers. The full commitment of HBM capacity means Alphabet must compete not only with other cloud providers but also with system integrators and other buyers for a limited pool of output 35,38,53,54. The company’s in-house TPU designs may afford some flexibility in memory specifications, but the fundamental dependence on HBM remains unavoidable.
The reallocation from DDR to HBM introduces a further margin pressure: while Alphabet’s AI and cloud segments benefit from HBM availability, its broader hardware portfolio—including Chromebooks and Pixel devices—could face higher input costs if DDR prices rise as a consequence of restricted supply. The legal proceedings around alleged price fixing add another layer of uncertainty. A successful prosecution could lead to remedies that increase supply, but the process is likely to be protracted, and the potential for fines or behavioural constraints may disrupt supplier relationships in the interim.
The behaviour of the memory manufacturers themselves offers some clues to the path ahead. Samsung and SK Hynix are actively pursuing long-term supply agreements of three to five years 36, and Alphabet’s financial strength and scale as a cloud provider position it well to negotiate such contracts. Notably, Alphabet participated in the Series H funding round of Anthropic alongside Micron, Samsung, and SK Hynix 38. This investment can be interpreted as a strategic move to deepen ties with the memory supply chain, perhaps securing indirect preferential access to next-generation technologies. In a market where vertical alignment is increasingly pronounced, such financial connections may prove as important as traditional procurement relationships.
Competitive Dynamics and the Path to Equilibration
The extreme concentration of the HBM market is not necessarily permanent, nor are its effects uniformly adverse for Alphabet. The competitive dynamics among the three producers contain the seeds of a more balanced supply environment. Samsung, currently trailing SK Hynix, is actively working to close the technology gap. Nvidia, the primary customer for HBM, is qualifying additional suppliers 17, and Samsung is leveraging synergies between its memory and foundry businesses to improve HBM yields and accelerate product qualification 17,24. If successful, these efforts could introduce greater supply diversity, tempering the price premiums that a dominant supplier can extract.
The long-run elasticity of supply in memory fabrication, while slow to materialise, is nonetheless real. The capacity expansions underway will, given time, alter the bargaining power of buyers. The interesting question is not whether the current tightness will persist indefinitely—markets have a way of generating their own corrections—but at what pace and with what distributional consequences. The highly consolidated structure means that even as supply grows, the oligopolistic coordination of investment and output may keep prices above the level that would prevail under more fragmented conditions. The allegations of supply manipulation reinforce the need for close monitoring of market conduct, but they do not erase the fundamental logic that high margins attract capacity.
Conditional Assessment
Under current conditions, Alphabet’s AI and cloud businesses operate at the mercy of a concentrated memory supply base. Securing long-term contracts and fostering strategic partnerships are essential to mitigate near-term supply risk. The shift in production mix toward HBM raises input costs for the broader hardware ecosystem, while legal uncertainties around past conduct introduce regulatory risks that could alter competitive dynamics. Looking toward the late 2020s, the combination of Samsung’s catch-up efforts and the industry’s capacity expansions may gradually loosen SK Hynix’s grip, offering Alphabet more favourable pricing and allocation options. Prudent strategic planning would account for elevated memory costs through at least 2028, while positioning the company to benefit from a potential diversification of supply in the longer run.