Japan's Koyo makes mould maker Kataoka Seiki a wholly owned subsidiary
What's the deal? Koyo, a precision spring manufacturer based in Higashi-Osaka, Japan, has completed the full acquisition of Kataoka Seiki Seisakusho, a precision mould maker headquartered in Shiga Prefecture. The deal — the financial terms of which were not disclosed — gives Koyo full ownership of a company that specialises in designing and manufacturing high-precision, high-durability moulds used in multi-forming processes and thin-plate spring production.
Kataoka Seiki was founded in 1979 and serves domestic and international manufacturers. Koyo, founded in 1966, supplies precision springs to industries ranging from water heaters and automotive to electronics and medical devices.
Why now? Manufacturing is under growing pressure to deliver higher precision, shorter lead times, and lower costs. Integrating mould design directly into spring production lets Koyo build an end-to-end pipeline — from product design through tooling to mass production — that it says will cut development timelines and strengthen its pricing position.
The timing also ties to a joint venture the two companies launched earlier in 2025: Koyo Spring Vietnam Co., Ltd., a manufacturing and sales hub targeting rising ASEAN demand for precision springs and components. Making Kataoka Seiki a wholly owned subsidiary tightens coordination between domestic R&D and the Vietnamese production base.
What could go wrong? Both companies are small — each has registered capital of just ¥10M (roughly $67,000). Integrating two niche manufacturers with different cultures and geographies is never straightforward, and the Vietnam operation is still in its early stages. Scaling globally from a narrow technical base carries execution risk, especially in a region where larger competitors already have entrenched supply chains.
The signal: With both Koyo and Kataoka Seiki operating on registered capital of just ¥10M each, this deal underscores how Japan's micro-cap precision manufacturers are pursuing consolidation and overseas expansion as a survival strategy rather than a growth luxury. The simultaneous establishment of a Vietnamese production base points to a wider reconfiguration of ASEAN supply chains, where integrated tooling-to-production capabilities are becoming a prerequisite to win contracts from larger OEMs in automotive, electronics, and medical devices.
Read more: prtimes.jp
