# Who does Sumitomo Electric pay? Who are its key suppliers?
Canonical: https://valuechain.wiki/sumitomo-electric · Facet: suppliers · Updated: 2026-07-12T08:19:57.523251+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: Sumitomo Electric discloses no named confirmed suppliers/cost counterparties; 2 relationships are tracked as undisclosed/aggregate. Per the valuechain.wiki graph: 2 cost edges, backed by 2 dated sources, 1 of them primary filings (as of 2026-07-12).

### 실리카·소재·제조 (비공개) (low)
- note: Pure silica, materials and manufacturing.
- [confirms] Sumitomo Electric (JA, filing, published 2025-06-25) https://sumitomoelectric.com/rd/info-communications: "Makes ultra-low-loss fiber."

### 제조·증설 (비공개) (low)
- note: Fiber/cable manufacturing and capacity.
- [confirms] Sumitomo Electric (EN, ir, published 2026-01-01) https://sumitomoelectric.com/: "Fiber/cable manufacturing and capacity."

Reverse side: https://valuechain.wiki/sumitomo-electric/customers.md · Ripple: https://valuechain.wiki/sumitomo-electric/ripple.md

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Full node: https://valuechain.wiki/sumitomo-electric.md · JSON: https://valuechain.wiki/sumitomo-electric.json