What NAND is

NAND flash is the storage memory inside almost every device you own: the solid-state drive in a laptop, the storage in a phone, the memory card in a camera. Unlike DRAM, which holds data only while power is applied, NAND keeps its data when the power is off. That is the difference between working memory and storage.

The name comes from the logic gate arrangement the cells use, but for investors the distinction that matters is the one between DRAM and NAND. DRAM is fast, volatile working memory; NAND is slower, non-volatile storage. The AI buildout has made DRAM and HBM the headline story, but NAND is the other half of the memory industry.

How NAND differs from DRAM and HBM

The three memory types sit on a spectrum. DRAM is the fast memory that a processor uses to hold data it is working on right now. HBM is DRAM stacked and packaged to sit beside an accelerator, trading density for enormous bandwidth. NAND is the storage layer, holding terabytes of data that need to survive a power cycle.

The AI boom has pushed most of the attention toward HBM, because accelerators are bandwidth-hungry. But NAND rides the same buildout: every data center full of accelerators also needs storage, and the models, datasets, and checkpoints all live somewhere. NAND is where they live.

The three manufacturers

NAND, like DRAM and HBM, is a concentrated business. The three names that dominate memory, Micron Technology (MU), SK Hynix, and Samsung, also dominate NAND, with a handful of other players such as Kioxia and Western Digital sharing the storage tier. Micron is the only major US-based manufacturer, vertically integrated from design through fabrication, and it makes DRAM, HBM, and NAND under one roof.

That diversification matters. A memory maker that sells both DRAM and NAND can smooth some of the volatility of either market, because the two do not always move in lockstep. Samsung, with its enormous consumer electronics business, is even more diversified. Our piece on Samsung semiconductor stock explains what that mix means for investors.

Why NAND has its own cycle

NAND has been one of the most violently cyclical products in all of semiconductors. The storage market has swung from shortage to oversupply and back many times over the past two decades, and the manufacturers have repeatedly added capacity into the teeth of a downturn, pushed prices down, and then consolidated when the losses mounted.

The memory cycle is the honest undercurrent beneath any pitch that points at a memory maker. Our 10X Project teardown notes that the pitch leans on a roughly $33 billion HBM market by 2027 and a backward-looking +911% scoreboard for Micron, but the storage half of the business carries the same boom-and-bust DNA.

Where NAND fits in the AI story

NAND is the quieter beneficiary of the AI buildout. HBM gets the attention because it is the scarce, expensive, bandwidth-critical part. NAND gets the volume, because every server, every training dataset, and every checkpoint needs somewhere to live, and solid-state storage is the only sensible place for it.

The honest way to weigh NAND is as the storage counterpart to the DRAM and HBM growth story. It does not have HBM’s pricing power, but it also does not have HBM’s single-customer concentration, and its demand is broader. Both are cyclical, both are dominated by the same three firms, and both reward the same discipline.

NAND and the memory cycle together

Because Micron, SK Hynix, and Samsung make DRAM, HBM, and NAND in the same fabs, the three product lines move together through the cycle more often than not. A boom in AI memory tends to pull capital toward DRAM and HBM, which can tighten NAND supply as a side effect, and a bust in one tier rarely leaves the others untouched.

Micron, the only major US-based manufacturer, is vertically integrated from design through fabrication, and it trades around $935.39 a share with a market cap near $1.06 trillion and roughly 15 times forward adjusted earnings. Those are the numbers behind the “silent partner” pitch, which opened on the DeepSeek panic of late January 2025 and leaned on a promised conference call around April 23 that came and went with no supplier reveal. For a NAND investor, the takeaway is that storage is never a story on its own; it is always hitched to the same cycle that drives DRAM and HBM.

What it means for investors

For an investor, NAND manufacturers are a way to own the storage side of the memory story, one that is more diversified and less headline-driven than HBM. The trend is real: the world stores more data every year, and solid-state storage is the default. The risk is the cycle, which has punished NAND producers in every downturn.

The useful frame is to separate the two halves of the memory business, DRAM and HBM on one side and NAND on the other, and to understand which one a given company leans on. Micron, SK Hynix, and Samsung make both, which means the pitch that points at Micron is pointing at a company whose fortunes span the entire memory stack, storage included.

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