Samsung still leads the market for the memory chips that sit inside everything from smartphones to AI data centers, but the race behind it has tightened to its narrowest margin in years. In the second quarter, Samsung held 38% of the global DRAM market, SK Hynix 25%, and Micron 24%, according to storage market tracker data from Counterpoint Research published October 2.
The numbers describe a three-way contest in which the two challengers are now separated by a single percentage point. Micron, the smallest of the three, closed the gap with SK Hynix to one percentage point on the strength of a record quarterly report, the tracker showed. Together, the three companies account for nearly 90% of the market, an oligopoly that has held through boom and bust cycles.
The drivers are the same ones reshaping the rest of the chip industry: high-bandwidth memory and server memory. HBM, the stacked memory that sits next to AI accelerators, has become one of the most valuable products in the semiconductor supply chain, and the companies that can manufacture it at scale are capturing the gains. Server DRAM has followed the same upward path as data centers expand to train and run large models.
For Micron, the second-quarter result is the payoff of a bet the company placed years ago to move early into HBM. It has supplied its HBM products to Nvidia and other accelerator makers, and that position has translated into record revenue and profit as AI demand has surged. The 24% share it recorded in the quarter is among the highest the company has claimed in recent years, and it brings Micron to within striking distance of second place.
SK Hynix, for its part, has been the early leader in HBM, and it remains the principal supplier of the most advanced versions of the memory to Nvidia. Its 25% share reflects that strength, but the tracker’s figures show the margin over Micron has narrowed as Micron’s volume has grown. The two companies are now competing head-to-head for the same AI-driven orders, with Samsung above them defending its lead.
Samsung’s 38% share keeps it comfortably in first place, but the company has faced pressures of its own. It has lagged its rivals in qualifying the most advanced HBM products for Nvidia’s latest accelerators, a gap it has been working to close. Its lead in overall DRAM remains large, yet the most valuable slice of the market, the memory attached to AI chips, is where the next phase of the contest will be decided.
The technology at the center of the contest is advancing quickly. The industry is moving from HBM3E, the memory now shipping in the highest volumes, toward HBM4, the next generation that promises more bandwidth for the following wave of accelerators. Qualifying each new generation with Nvidia is a make-or-break exercise, and it has become the arena where the three producers’ fortunes are set, more than their share of the older, commodity DDR memory that still fills most servers and personal computers.
The memory industry is famously cyclical, and the current upcycle has been unusually long and steep, powered by AI investment that shows little sign of slowing. Prices have climbed, capacity has tightened, and all three manufacturers have been investing to expand output. The Counterpoint data captures a moment when the rewards of that cycle are flowing to the companies that bet early on the memory AI needs most.
The share shift carries consequences beyond the manufacturers themselves. Memory is now one of the largest single costs in an AI server, and the health of the three producers shapes how quickly and how cheaply the rest of the AI build-out can proceed. When Micron, SK Hynix and Samsung are all running near full capacity and posting records, it is a sign of durable demand; it is also a sign that buyers have little bargaining power on price.
The last time the standings shifted this much was during the memory downturn of the late 2010s, when a supply glut crushed prices and forced consolidation. Samsung and SK Hynix used that period to press their advantage, while Micron concentrated on cost discipline. The AI era has reversed the pressure: demand for the highest-bandwidth memory now exceeds what all three can produce, and the question is no longer who survives a glut but who can add the most capacity the fastest.
What happens next depends on whether the upcycle holds. The three producers are adding capacity, and new HBM lines take time to come online. If demand keeps growing faster than supply, the tight market will persist and Micron’s push toward SK Hynix will continue. If the cycle turns, the same three companies will absorb the downturn together, just as they always have. For now, the standings are closer than they have been in a long time, and the battle for the memory inside the world’s AI systems has become a genuine three-way race.
