MUTuesday, 27 Oct 2026
3-5 year long-term contracts, Samsung overtakes in HBM, CXMT turns down orders, Rubin Ultra HBM4, Anthropic prospectus
In a closed-door session, Micron's management disclosed that long-term contracts have lengthened from 1 year to 3-5 years, that talks on 2031 contracts have begun, and that price floors sit above the previous cycle's peak. That is the hardest evidence that this cycle is different.
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Samsung's HBM revenue may already have overtaken SK Hynix's, which raises share and pricing pressure on third-placed Micron. CXMT's refusal of orders from Apple and an overseas server maker is positive for Micron's overseas pricing but erodes its share in China. The Rubin Ultra 8-high HBM4 timetable points to volume production in Q2 2027, and whether Micron is on the supplier list is yet to be confirmed. Anthropic's prospectus lists HBM as a risk, which supports the long-term contract logic from the buyer's side.
Key evidence
- BofA analysts met Micron COO Bhatia, CTO DeBoer and CFO Murphy in New York and Boston in late October (as relayed by BigGo).
- Management: supply will be tighter in 2027 and 2028. Customer contracts have lengthened from 1 year or less to 3-5 years, with some covering about 5 years beyond 2030.
- Talks have begun on 2031 contracts. The target is for long-term contracts to make up 50% of sales by 2030, against about 35% now.
- New detail on the long-term contracts: they specify committed bit volumes and financial terms, and set a price floor above the previous cycle's peak.
- Management: memory configurations in GPUs and servers are being held back by supply, not by compute, packaging, power or facilities. As soon as supply loosens, customers will add memory back.
- Bernstein, using a regression on Korean export data, estimates Samsung's Q3 HBM revenue at about $8.7 billion (up 33% QoQ) and Hynix's at about $7.6 billion (up 11% QoQ).
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- In September, Korean HBM exports rose 45% month on month and 131% year on year. Samsung's export value per unit of weight is about 4 times Hynix's (a reflection of product mix, not selling price).
- Micron's share is under pressure (echoing Counterpoint's estimate of 21 Oct that it has fallen from 21% to 17%).
- Wccftech (25 Oct) and Guancha.cn (26 Oct): CXMT has turned down Apple's low-price purchasing and a DDR5 order from an overseas server maker.
- Yole: about 90% of CXMT's capacity supplies Chinese brands (Huawei, Xiaomi, Lenovo).
- TrendForce: CXMT's monthly capacity is about 320,000 wafers, rising to about 420,000 in 2027.
- Counterpoint, Q2 DRAM revenue share: CXMT 10%, Micron 24% (share in China is being eroded).
- ZDNet Korea (26 Oct): Samsung and Hynix plan volume production of 8-high HBM4 for Rubin Ultra around Q2 2027.
- Yield and heat-dissipation problems with 12-high stacks are unresolved, but 12-high will not be dropped entirely. The report does not say whether Micron is on the 8-high supplier list.
- Blocks & Files, citing Morgan Stanley: NVIDIA will buy about 37% of the world's HBM in 2027.
- Anthropic filed its listing registration documents with the SEC on 26 Oct. Its risk factors state that HBM production is concentrated in three makers: Hynix, Samsung and Micron.
- The Taoyuan union and Micron are holding a second round of talks today at Taoyuan City Government (postponed because of a typhoon).
- Hynix reports Q3 results at 8:00 Singapore time on 28 Oct. Watch HBM4 shipments, 2027 long-term contract pricing, capital expenditure and the special dividend.
Catalysts to watch
- Micron's 10-Q or earnings call disclosing the coverage ratio of long-term contract price floors
- Hynix's results on 28 Oct (HBM4 shipments, 2027 long-term contract pricing, capital expenditure, special dividend)
- Whether Micron makes the supplier list for Rubin Ultra 8-high HBM4
- Outcome of the second round of talks between the Taoyuan union and Micron
- Further detail from Anthropic's prospectus, and the pace at which AI customers sign contracts
- Pace of HBM4 volume production in Q2 2027
Risks
- With Samsung's HBM revenue overtaking Hynix's, pricing and share pressure on third-placed Micron rises.
- Micron's HBM share is estimated to have fallen from 21% to 17% (Counterpoint).
- Share in China is being eroded by CXMT (about 90% of its capacity supplies Chinese brands).
- The coverage ratio of the long-term contract price floors has not been disclosed, so how much protection they offer is yet to be verified.
- Yield and heat-dissipation problems with 12-high HBM4 are unresolved.
- Management's statements are unaudited, so they should be discounted until they appear in an 8-K or 10-Q.
Sources (10)
- BigGo Finance (relaying a BofA analyst report)
- Bernstein
- Wccftech (25 Oct)
- Guancha.cn (26 Oct)
- Yole
- TrendForce
- Counterpoint
- ZDNet Korea (26 Oct)
- Blocks & Files (citing Morgan Stanley)
- Anthropic SEC listing registration filing (26 Oct)
A brief is a lead for our research, not a verified conclusion or advice.