👉 Breaking Down Micron ($MU)

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Hi everyone,

Alright, this one has been sitting near the top of our list for months, and this week finally forced our hand. We woke up to headlines about a Chinese memory company that barely existed a decade ago becoming the most valuable listed firm in mainland China, and the very first thing we thought about was Micron. So here we go.

As a reminder, this specific deep-dive is written by the GRIT team and is not the exclusive work of Head Analyst Austin Hankwitz.

Micron is the last American DRAM maker at scale and one of only three companies on earth that can build high bandwidth memory for AI accelerators. That position just produced the most extreme quarter in the history of the memory industry: $41.46B of revenue, 84.9% gross margin, and $25.11 of earnings per share. The company crossed $1T in market value in May. It has also signed roughly $100B of minimum contracted revenue through 2030, an attempt to permanently break the boom and bust cycle that has defined this business for forty years. Today, a newly listed Chinese rival is testing whether that break holds.

• Why Now 👉 a $1T memory company meets its Chinese rival

• Overview 👉the dental office startup that became AI infrastructure

• How Do They Win 👉 three players, one bottleneck, zero spare capacity

• Business Units 👉 four segments, all printing record margins

• How Do They Make Money 👉 bits, prices, and now locked in contracts

• By The Numbers 👉 the most absurd income statement in semis

• Bonus Deep Dive 👉 the $100B contracts that tried to break the cycle

• Risks 👉 what could go wrong

• Wrapping Up 👉 where I land

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Why Now 👉 the split, the AI surge, and four straight beats

Micron crossed $1T in market value on May 26 of this year, which puts it in a very small club that essentially nobody had Micron joining eighteen months ago. The stock is up roughly 700% over the past year. Its 52 week range runs from $103.38 to $1,255.00. That is not a typo, and it is the widest range I have ever put in one of these write ups.

Then this morning happened. ChangXin Memory Technologies, the Hefei based DRAM maker known as CXMT, listed on Shanghai's STAR Market after raising $8.6B, and the shares finished the first session up about 466%. That values the company near 3.3 trillion yuan, roughly $480B, making it the most valuable listed company in mainland China ahead of ICBC. Micron traded down on the news and now sits meaningfully below its highs.

So we have a company posting the best margins in the history of its industry, sitting on $100B of contracted future revenue, and the market is nervous anyway. That tension is exactly why I wanted to do this write up today. Either the memory cycle has genuinely been rewired by AI, in which case this weakness is noise, or the oldest lesson in semiconductors is about to reassert itself and a very well funded Chinese entrant is what triggers it. I do not think the answer is obvious, and I want to walk through both sides honestly.

Overview 👉 the dental office startup that became AI infrastructure

Micron was founded in 1978 in the basement of a Boise dental office, which remains one of my favorite facts in all of technology. It is now the only American company making DRAM at scale and one of just three worldwide with serious high bandwidth memory capability. Sanjay Mehrotra has run it since 2017. Roughly 53,000 employees.

Memory has always been a commodity business. Micron makes DRAM, the fast working memory every computer and every AI server needs, and NAND, the flash storage inside SSDs and phones. DRAM was 76% of revenue last quarter at $31.3B. For four decades the pattern was reliable and merciless: demand spikes, everyone builds fabs, supply floods the market, prices collapse, everyone loses money, repeat. Micron lost $5.8B in fiscal 2023 doing precisely that dance.

What changed is HBM, high bandwidth memory, which is DRAM stacked vertically and wired straight through the silicon so it can feed an AI accelerator fast enough to keep it busy. Every Nvidia GPU needs it. By widely cited industry estimates it consumes roughly three times the wafer capacity of conventional DRAM for the same bits delivered, which means every HBM wafer Micron commits pulls standard supply off the market. That one structural fact is why the entire memory industry is short today, and why Micron's income statement looks the way it does.

How Do They Win 👉 three players, one bottleneck, zero spare capacity

Three companies matter in DRAM. As of the first quarter of this year, Samsung held roughly 39% share, SK Hynix roughly 29%, and Micron roughly 22%. That is the market. Building a leading edge memory fab now costs tens of billions, process nodes take years to qualify, and the EUV lithography tools come from exactly one supplier in the Netherlands. As competitive structures go, this is about as defensible as anything outside a regulated utility.

Micron's specific edge is technology cadence. It was first in the industry to ship a 1-gamma DRAM node, and both 1-gamma DRAM and its G9 NAND node are ramping toward becoming the highest volume nodes in company history. It shipped HBM4 samples with bandwidth above 2.8TBps and pin speeds over 11Gbps. It has been certified as an HBM4 supplier for Nvidia's Vera Rubin platform alongside Samsung and SK Hynix, and has already booked more than $1B of HBM4 revenue.

Being American matters in a way it simply did not five years ago. Micron is a CHIPS Act beneficiary, broke ground on a New York fab cluster in January with Bechtel as construction partner, targets initial Idaho output in mid-2027, and has been actively lobbying Washington to tighten restrictions on Chinese memory makers. When a hyperscaler decides where to source memory for a decade of AI buildout, a domestic supplier with locked in capacity is making an argument that has nothing at all to do with price per bit.

Business Units 👉 four segments, all printing record margins

Micron reports four business units, and last quarter every single one set a revenue record at gross margins that would look like a typo in any earlier era of this industry.
Cloud Memory Business Unit, or CMBU, is the hyperscaler and HBM business. It did $13.8B, 33% of revenue, at 83% gross margin and 78% operating margin. This is the crown jewel.

Core Data Center Business Unit, or CDBU, covers enterprise and non-hyperscale data center demand plus data center SSDs. It did $11.5B, up 653% year over year, at an 87% gross margin. Enterprise SSD revenue alone was about $5B and more than doubled sequentially.

Mobile and Client Business Unit, or MCBU, sells into smartphones and PCs. It also did $11.5B at 87% gross margin. Worth noting that bit shipments here actually fell. Micron is deliberately starving the phone and PC market to feed data center customers, and pricing is so extreme that revenue grew anyway.

Automotive and Embedded Business Unit, or AEBU, posted a record $4.6B at 79% margin. The long run story here is content growth. A car with basic driver assistance carries about 16GB of DRAM. A Level 4 autonomous vehicle needs over 300GB.

Together the two data center facing units generated more than $25B in a single quarter. For context, Micron's entire annual revenue in fiscal 2023 was $15.5B.

How Do They Make Money 👉 bits, prices, and now locked in contracts

The mechanics are simple and brutal. Micron manufactures wafers, cuts them into bits of DRAM and NAND, and sells those bits. Revenue equals bits shipped times average selling price. Costs are dominated by depreciation on fabs built years earlier, which makes the operating leverage violent in both directions.

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