# Who does United Microelectronics (UMC) pay? Who are its key suppliers?
Canonical: https://valuechain.wiki/umc · Facet: suppliers · Updated: 2026-07-12T08:20:16.520645+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: United Microelectronics (UMC)'s confirmed suppliers/cost counterparties include GlobalWafers, Siemens EDA, ASML plus 6 undisclosed/aggregate relationships. Per the valuechain.wiki graph: 9 cost edges, backed by 9 dated sources, 3 of them primary filings (as of 2026-07-12).

### GlobalWafers (high)  → /globalwafers.md
- note: Uses/buys 300mm silicon wafers from GlobalWafers.
- [confirms] GlobalWafers (EN, ir, published 2025-03-01) https://www.globalwafers.com/en/investors: "IR: silicon-wafer revenue and customers."
- [confirms] Mordor Intelligence (EN, analysis, published 2025-01-01) https://www.mordorintelligence.com/industry-reports/semiconductor-silicon-wafer-market: "Top-five 300mm oligopoly; GlobalWafers ~15%."
- [confirms] TheElec (KO, news, published 2024-06-01) https://www.thelec.kr/news/articleView.html?idxno=9435: "Supplies wafers to TSMC, UMC, Samsung."

### Siemens EDA (mid)  → /siemens-eda.md
- note: Pays for Siemens EDA (Calibre etc.) licenses.
- [confirms] SemiWiki (EN, research, published 2025-06-01) https://semiwiki.com/wikis/company-wikis/mentor-graphics-wiki/: "umc specifies and licenses Calibre physical verification for tape-out signoff."
- [confirms] Siemens (EN, ir, published 2025-01-01) https://eda.sw.siemens.com/en-US/ic/calibre-design/physical-verification/: "umc specifies and licenses Calibre physical verification for tape-out signoff."

### ASML (mid)  → /asml.md
- note: Buys lithography from ASML.
- [mentions] SEC EDGAR (EN, filing, published 2026-01-28) https://www.sec.gov/Archives/edgar/data/0001033767/000119312526025557/umc-ex99_1.htm: "6-K: buys wafer-fab equipment from major toolmakers."

### KLA (mid)  → /kla.md
- note: Buys inspection/metrology tools from KLA.
- [mentions] SEC EDGAR (EN, filing, published 2026-01-28) https://www.sec.gov/Archives/edgar/data/0001033767/000119312526025557/umc-ex99_1.htm: "6-K: buys wafer-fab equipment from major toolmakers."

### 어플라이드 머티어리얼즈 (mid)  → /applied-materials.md
- note: Buys wafer-fab tools from Applied Materials.
- [mentions] SEC EDGAR (EN, filing, published 2026-01-28) https://www.sec.gov/Archives/edgar/data/0001033767/000119312526025557/umc-ex99_1.htm: "6-K: buys wafer-fab equipment from major toolmakers."

### 램리서치 (mid)  → /lam-research.md
- note: Buys etch/deposition tools from Lam Research.
- [mentions] SEC EDGAR (EN, filing, published 2026-01-28) https://www.sec.gov/Archives/edgar/data/0001033767/000119312526025557/umc-ex99_1.htm: "6-K: buys wafer-fab equipment from major toolmakers."

### Synopsys (mid)  → /synopsys.md
- note: Pays for synopsys EDA tools and IP licenses.
- [confirms] SEC EDGAR (EN, filing, published 2025-12-22) https://www.sec.gov/Archives/edgar/data/883241/000088324125000028/snps-20251031.htm: "umc foundry certifies and licenses synopsys EDA tools/IP for its process (PDK/DTCO)."
- [confirms] TSMC (EN, ir, published 2025-04-01) https://www.tsmc.com/english/dedicatedFoundry/oip/eda_alliance: "umc foundry certifies and licenses synopsys EDA tools/IP for its process (PDK/DTCO)."

### Cadence Design Systems (mid)  → /cadence.md
- note: Pays for cadence EDA tools and IP licenses.
- [confirms] SEC EDGAR (EN, filing, published 2026-02-19) https://www.sec.gov/Archives/edgar/data/813672/000081367226000016/cdns-20251231.htm: "umc foundry certifies and licenses cadence EDA tools/IP for its process (PDK/DTCO)."
- [confirms] TSMC (EN, ir, published 2025-04-01) https://www.tsmc.com/english/dedicatedFoundry/oip/eda_alliance: "umc foundry certifies and licenses cadence EDA tools/IP for its process (PDK/DTCO)."

### 웨이퍼·소재 (비공개) (low)
- note: Buys silicon wafers and process materials (suppliers undisclosed).
- [mentions] SEC EDGAR (EN, filing, published 2026-01-28) https://www.sec.gov/Archives/edgar/data/0001033767/000119312526025557/umc-ex99_1.htm: "6-K: wafer and materials supply chain."

Reverse side: https://valuechain.wiki/umc/customers.md · Ripple: https://valuechain.wiki/umc/ripple.md

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Full node: https://valuechain.wiki/umc.md · JSON: https://valuechain.wiki/umc.json