Micron is one of the world's largest memory chip makers and a growing supplier of high-bandwidth memory (HBM), the speci...
Memory and HBM.
High-bandwidth memory is the bottleneck alongside compute. These suppliers ride every new AI training cluster build-out.
SK Hynix SKHY
SK Hynix is the leading producer of high-bandwidth memory and Nvidia's primary HBM partner for its AI GPU platforms. HBM...
Samsung Electronics 005930
Samsung Electronics is a diversified conglomerate spanning memory chips, foundry services, displays, and consumer electr...
Why memory matters for AI.
An AI accelerator is only as fast as the data it can be fed. High-bandwidth memory (HBM) solves that by stacking layers of DRAM on top of each other and placing the stack right next to the processor, in the same package. Each modern AI chip carries several of these stacks, and for many workloads memory bandwidth limits performance as much as raw compute does.
HBM is far harder to make than ordinary memory, and only three companies produce it in volume: SK Hynix, Samsung and Micron. That makes this the most concentrated category on the site.
The three suppliers.
SK Hynix took the early lead as Nvidia's main HBM supplier and has held the largest share for most of the AI boom. Samsung, the world's largest memory maker overall, fell behind on earlier generations but was the first to finish validating and shipping the new HBM4 generation in the second quarter of 2026, and gained share as a result. Micron, the only US-based supplier, is the smallest of the three in HBM but has grown quickly from a low base.
For investors the three are very different vehicles. Micron is close to a pure memory company. SK Hynix is mostly memory and, since July 2026, also trades on Nasdaq through American depositary receipts. Samsung also makes phones, displays and chips for others, so HBM is a smaller part of the whole.
What moves these stocks.
Memory is a commodity business with prices that swing with supply and demand. AI has tilted it: making HBM takes up factory capacity that would otherwise produce ordinary DRAM, which has tightened supply and pushed up memory prices for everyone. Microsoft said higher component prices added about $25 billion to its 2026 capital spending.
Watch qualification news (whether a supplier's newest HBM passes Nvidia's and AMD's tests), the timing of each generation, and memory contract prices.
Risks to weigh.
Memory has a long history of boom and bust: when all three suppliers add capacity at once, prices can fall sharply. A delay on a new generation can cost a supplier its place with the biggest customer for a year or more, as SK Hynix risked when HBM4 production slipped in 2026. And Samsung trades mainly in Seoul, with depositary receipts in London, which adds currency and access questions for many investors outside Korea.