# Who does Mitsubishi Heavy Industries pay? Who are its key suppliers?
Canonical: https://valuechain.wiki/mitsubishi-heavy-industries · Facet: suppliers · Updated: 2026-07-12T03:24:01.023141+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: Mitsubishi Heavy Industries's confirmed suppliers/cost counterparties include Toray (T800 carbon-fiber prepreg) plus 1 undisclosed/aggregate relationship. Per the valuechain.wiki graph: 2 cost edges, backed by 3 dated sources, 2 of them primary filings (as of 2026-07-12).

### 도레이 (T800 탄소섬유 프리프레그) (high)  → /toray-industries.md
- note: Single-material dependence that governs the 787 wing's properties: MHI forms the Boeing 787 wing box from Toray T800 toughened prepreg via automated tape laying. As a primary structure it is effectively non-substitutable, so Toray's carbon-fiber capacity and pricing feed directly into MHI's aerospace cost and delivery.
- [mentions] Mitsubishi Heavy Industries (EN, filing, published 2025-01-01) https://www.mhi.com/products/air/boeing_787.html: "Forms the 787 wing composite (CFRP)."
- [confirms] CompositesWorld (EN, news, published 2024-01-01) https://www.compositesworld.com/articles/boeing-787-update: "MHI's 787 wing box is made from Toray T800 carbon-fiber prepreg."

### Edgewing (GCAP 6세대 전투기 합작사, 33.3%) (high)
- note: An equity bet on next-generation defense: in June 2025 it launched the GCAP 6th-gen fighter JV Edgewing with UK's BAE and Italy's Leonardo at 33.3% each. As the F-2 successor program (targeting 2035), it is MHI's next-decade defense pipeline, leveraging domestic fighter capability across a three-nation split.
- [confirms] Leonardo / GCAP (EN, news, published 2025-06-20) https://www.leonardo.com/en/press-release-detail/-/detail/20-06-2025-global-combat-air-programme-gcap-marks-major-milestone-industry-partners-launch-joint-venture-company-edgewing-to-deliver-next-generation-combat-aircraft: "BAE, Leonardo and MHI (JAIEC) launch Edgewing with 33.3% each."

### 철강·단조·기자재 (원자재) (mid)
- note: Special steels, large forgings and castings for gas turbines, reactors, ships and plants are core costs; material and subcontracting inflation are margin variables.
- [confirms] Mitsubishi Heavy Industries (EN, filing, published 2026-05-12) https://www.mhi.com/finance/library/result/pdf/fy20254q/financial_results.pdf: "Material and subcontracting costs are core to the cost structure."

Reverse side: https://valuechain.wiki/mitsubishi-heavy-industries/customers.md · Ripple: https://valuechain.wiki/mitsubishi-heavy-industries/ripple.md

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Full node: https://valuechain.wiki/mitsubishi-heavy-industries.md · JSON: https://valuechain.wiki/mitsubishi-heavy-industries.json