Tokyo Ohka Kogyo → United Microelectronics (UMC)
As of 2026-09-05, Tokyo Ohka Kogyo is a tracked supplier of United Microelectronics (UMC). Tokyo Ohka Kogyo is a leader in Materials (headquartered in Japan); United Microelectronics (UMC) is a major in Foundry (headquartered in Taiwan). Tokyo Ohka Kogyo has 8 tracked customers; United Microelectronics (UMC) has 24 tracked suppliers.
Data as of 2026-09-05 · relationship type: tracked supplier → customer · both names resolve in companies.json · no dollar amount is shown unless it already sits on a company record, and none is invented here
Why this edge matters
Tokyo Ohka Kogyo (leader in Materials) is a tracked supplier of United Microelectronics (UMC) (major in Foundry). Photoresist specialist with leading EUV resist share. Taiwan's second foundry, strong in mature and specialty nodes. The edge is one of 24 tracked suppliers of United Microelectronics (UMC) and one of 8 tracked customers of Tokyo Ohka Kogyo.
Source: derived from both company records and the counted edges.
Concentration / risk note
Tokyo Ohka Kogyo is positioned as a leader in Materials, so this edge is harder to replace than a challenger or niche supplier.
Basis: supplier position. Omitted on edges where the graph does not back a concentration claim.
The two companies
Tokyo Ohka Kogyo (supplier)
Photoresist specialist with leading EUV resist share.
United Microelectronics (UMC) (customer)
Taiwan's second foundry, strong in mature and specialty nodes.
Other tracked suppliers of United Microelectronics (UMC)
Other tracked customers of Tokyo Ohka Kogyo
Cite as: wafergraph, “Tokyo Ohka Kogyo → United Microelectronics (UMC) — supplier relationship in the semiconductor supply chain”, https://wafergraph.com/relationship/tok/umc/ (data as of 2026-09-05).
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