The deposits arrive before the bits

Micron reports its fourth quarter and full year on Wednesday, 30 September. It has not reported yet, which much of this week's commentary has forgotten. What is on the record, filed in June, is the most extraordinary set of accounts in the AI build-out, and the question for the call is not whether the numbers were good but whether they describe a business or a rent.

In the three months to 28 May, Micron took $41.456bn of revenue against $6.400bn of cost of goods sold. Gross margin was 84.6 per cent; cost was fifteen cents in the dollar. Guidance for the quarter now closing is $50bn, give or take a billion, at a gross margin near 86 per cent. The most cyclical, capital-hungry and commoditised business in semiconductors is running software margins.

Set that beside its customers. Nvidia's gross margin in the quarter to 26 July was 75.0 per cent; Samsung's semiconductor division ran a 70 per cent operating margin and SK hynix 76. The companies supplying the memory now out-earn the company designing the accelerator. The profit in the build-out is not in the part everyone photographs.

The composition makes it fragile. Micron's filing puts it without euphemism: the sequential rise in DRAM revenue came from "a low-60% range increase in average selling prices and a low-single-digit percentage range increase in bit shipments". Almost none of this is a manufacturing achievement; it is scarcity being priced. Finished goods fell to $621m from $1,094m at the previous year-end while revenue roughly quadrupled. There is no shelf left. The company's own phrase for what follows is "decisions on supply allocation that may impact certain customers and end markets".

This week supplied the miniature. Micron is reported to have ended production of its 2GB GDDR7 modules to concentrate on the 3GB parts used in professional accelerators. The report originates in a post on X, picked up by Tom's Hardware, whose verification amounted to noting that the product pages now return no results; Micron has said nothing. TrendForce puts the 2GB module near $20 and the 3GB at $60 to $70. That is the allocation decision in one line: the same wafer, sold for three times as much, to a customer who will not argue.

The bear case says this cannot last. Jason Chen, Acer's chairman, is reported by 24/7 Wall St. to have told reporters this month: "How could it stay short forever? Chinese capacity keeps coming onto the market. The supply shortage problem has already completely disappeared." The outlet names no venue or date, and Acer is an assembler squeezed by the prices it calls a bubble. The facts beneath the remark are firmer. ChangXin Memory brought its G5 DRAM platform into mass production around 20 September, with at least half again as many dies per wafer. Its capacity is put near 320,000 wafers a month, rising towards 420,000 by 2027, and its share of DRAM revenue reached 9.5 per cent in the second quarter, from 7.6 in the first.

Two points of share in a quarter is real. It is also not how a downcycle now reaches a supplier's accounts, because the mechanism is contract structure rather than spot price. Micron's strategic customer agreements are take-or-pay, with binding volumes over multi-year terms; pricing is fixed or banded, and on the largest the ceiling approximates the market price of this year's second calendar quarter while a floor runs through the term. Micron expects them, "even at floor pricing levels, to yield gross margins well above our peak quarterly margins in any past cycle", and expects $22bn of commitments so far, some $18bn of it as cash deposits. SK hynix has done the same with roughly ten customers.

The answer to Mr Chen sits in a filing rather than a press conference. Customers are paying cash in advance for bits that do not yet exist, so a Chinese-led price break would have to work through a floor, a term and a deposit before reaching an income statement. It would surface first in the uncontracted corners of the market — roughly the part Micron has just stopped serving. The banding is not free, though: a ceiling set at second-quarter prices caps Micron's own upside.

The demand side is documented in a way it was not six months ago. Nvidia's quarterly filing records supply commitments rising from $119bn to $279bn in a single quarter, "for our data center infrastructure systems, primarily memory and manufacturing facilities". The guidance this desk examined this morning, the one assuming no China data-centre revenue at all, sits on top of that commitment. Micron's margin is, fairly literally, a line inside it.

Someone pays for this. Samsung's mobile division swung to a 0.7 trillion won operating loss in the second quarter, from a 3.1 trillion won profit a year earlier, on what the company calls elevated component costs — while its memory division earned 89.2 trillion won. One conglomerate is moving margin from its phones to its chips inside a single set of accounts; outside it, core components have reached 68 per cent of a notebook's bill of materials against 45 per cent in early 2025.

Wednesday's call, then. The headline will be a very large number telling nobody anything they did not know in June. What matters is the updated size of the deposit book, whether the ceiling on the largest agreements has moved, and what Micron says about bit growth rather than price. A company earning eighty-five cents on the dollar because there is nothing on the shelf is in a different business from one earning it because it built what nobody else can — and only the second kind survives 420,000 wafers a month.