CompetitorsNarrow moat

Micron's 10-K names its competitors explicitly: Samsung Electronics, SK hynix, Kioxia, Sandisk, ChangXin Memory Technologies and Yangtze Memory Technologies¹. It adds two observations that are worth more than the list — that competitors may use aggressive pricing to obtain market share, and that some of them operate in jurisdictions with lower labour and compliance costs.

Those two sentences describe the whole competitive problem. Memory is a commodity: the parts are interchangeable within a specification, so competition expresses itself almost entirely as price, and the winner of any price war is whoever can lose money longest. That is why the moat pages treat the three-player DRAM structure as the central fact about this company — the discipline of a small group is the only thing standing between Micron and the industry's own history.

The four relationships here are correspondingly different in kind. Samsung is larger, more diversified and structurally able to subsidise memory from other businesses. SK hynix reached high-bandwidth memory first and forced Micron to close a gap in the segment that now matters most. CXMT and YMTC are state-backed entrants who do not need a competitive return, which is the one thing that has historically destroyed memory pricing. And the NAND field is simply more crowded than DRAM, which is why it is the worse half of the company.

Watch gross margin rather than share. In a commodity, share can always be bought with price, so the only competitive measure that means anything is what the industry is willing to charge — and Micron's margin swings from 84.6% at a peak to deeply negative at a trough² describe exactly how much is at stake.