Memory companies do not get 80% gross margins. That is the entire point of the memory business: it is the most brutally cyclical corner of semiconductors, a commodity where every up-cycle funds the capacity that ends it. So when SanDisk stood up at its 2026 Investor Day on Thursday and put roughly 80% non-GAAP gross margin, roughly 75% non-GAAP operating margin and roughly 50% adjusted free cash flow margin into a FY2028–FY2030 model, the reasonable first reaction was that somebody had mislabelled a slide.
The stock did not react that way. SanDisk rose more than 10% by midday Thursday and finished the session up around 14%. The read-through did the rest of the work: Micron climbed for a fourth straight day into Friday’s close, up 2.3% to $971.66, roughly 13% higher across five sessions and a long way from its 29 July trough near $739. On Monday morning the complex opened higher again — SanDisk up more than 5% pre-market, Micron and Western Digital more than 3%, Seagate more than 2%.
Strip out the margin headline and the actual news is a contract structure. SanDisk told investors its New Business Model agreements now cover roughly 50% of its bits in FY2027 and about two-thirds in FY2028, spread across eight customers, on long-term agreements of four years or more carrying committed volumes, minimum financial guarantees and structured pricing. Revenue is guided to grow in the mid-to-high teens, in line with bit growth — not ahead of it on price.
Our take: The margin number is the marketing. The contracts are the argument. What SanDisk is really telling the market is that its pricing mechanism has changed — that a majority of its output is sold years forward at guaranteed floors, which means the next NAND downturn hits volumes and mix rather than repricing every bit at once. If that holds, memory stops trading on a spot price and starts trading on a backlog, and a backlog carries a different multiple. If it does not hold — if customers renegotiate the moment supply loosens — then Thursday was an expensive promise made near the top of a cycle.
The timing is not an accident. AI server demand has kept both DRAM and NAND tight all year, and hyperscalers have learned the hard way that being unhedged on memory is a planning risk, not just a cost line. Committing four years of volume at a guaranteed floor is a price a buyer pays willingly when the alternative is not being able to buy at all. That is why the seller can ask for it now, and why the same ask would have been laughed out of the room three years ago.
A second development landed the same week and cuts the same direction. Commerce Secretary Howard Lutnick said on 14 August that the administration is not in favour of Apple sourcing memory from Chinese suppliers ChangXin Memory Technologies or Yangtze Memory Technologies, both of which appear on a Pentagon list of firms tied to China’s military. A bipartisan group of senators led by Jim Banks and Chuck Schumer has asked Tim Cook to commit by 21 August to keeping both out of Apple’s supply chain entirely, including products made and sold in China. Every gigabyte Apple cannot buy from CXMT or YMTC is a gigabyte it has to buy from the incumbents — at the exact moment those incumbents are trying to sell four-year contracts.
What to watch
- 21 August. Whether Apple gives the senators the commitment they asked for, or declines to. Either answer reprices non-Chinese NAND supply.
- Whether rivals copy the disclosure. SanDisk has set a benchmark. If Micron and SK hynix start quantifying long-term contracted bit coverage the same way, the re-rating case gets a second and third data point. If they stay quiet, SanDisk’s structure is an outlier rather than an industry shift.
- The first renegotiation. Minimum financial guarantees are only as good as a supplier’s willingness to enforce them against a very large buyer. Nobody has tested that yet.
- Micron at $1,000. A round number is not a thesis, but the stock is up more than 200% this year against a 52-week range that starts at $113.46. Positioning across the sector is now doing as much to the tape as fundamentals are.
The honest summary: a NAND company just asked Wall Street to stop valuing it like a NAND company, and offered signed paper as the reason. The market said yes inside a day. The paper has not been through a downturn.