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Tatsuta is a mid-sized Osaka manufacturer that applies copper-conductor and polymer know-how built over 80 years in wire and cable to specialist electronic materials. Its EMI shielding film for flexible printed circuits, sold under the WILMINA® brand, is used in smartphones and tablets. Third-party research has credited it with more than half of the world market. Around this franchise the company has added conductive pastes, gold, silver, copper and palladium-coated copper bonding wire for semiconductor packaging, liquid-leak detection sensors (now a growth line for liquid-cooled AI data centres) and medical-device components. By revenue, though, wire and cable is still the core: power-utility distribution lines, building wire and robot-grade industrial cable made up about 73% of FY3/2024 sales. Since JX Advanced Metals bought out minority shareholders in 2024, Tatsuta has been run as part of JX's Information and Communication Materials portfolio. JX now ties Tatsuta's packaging-materials and data-centre technology work directly to its own technology strategy. --- **The company's own description.** In its securities filings Tatsuta describes the group as the parent plus six consolidated subsidiaries in FY3/2024. They work in four areas: electric wire and cable, electronic materials, sensors and medical, and environmental analysis. The group says it uses technology from its founding wire business to serve electronic materials, electronics and optical components. On its recruitment profile it calls its functional films "indispensable materials for smartphones and tablets adopted by major global manufacturers." It also describes its strategy as aiming to be a "niche-top" supplier. **Business model.** Almost all revenue comes from products. Tatsuta makes and sells physical goods: copper wire and cable, coated films, pastes, fine wire and sensors. A small service business, Tatsuta Environmental Analysis Center, sells measurement and analysis services. No subscription or licensing revenue is disclosed beyond small royalty income: ¥18 million in FY3/2021 and ¥9 million in FY3/2022, recorded as non-operating income. **Revenue model by economics.** **Wire and cable:** is a copper pass-through business. Prices follow LME copper and the domestic copper base price, so revenue moves with metal prices while unit margins stay thin. Segment operating margins were between 1.2% and 4.4% from FY3/2021 to FY3/2024. Sumiden HST Cable Co., Ltd., the joint sales company for building and electrical wire, is the single largest customer. It took ¥17,793 million in FY3/2024, or 27.8% of consolidated sales. **Electronic materials:** is a specification-driven, design-in business with high value per square metre. It sells EMI films into flexible printed circuit (FPC) supply chains for handset and camera-module makers. Operating margins were 19.5% in FY3/2021 and 7.9% in FY3/2024. The business is very sensitive to smartphone production volumes and price competition from Chinese makers. **Other:** covers sensors, medical, optical and environmental analysis. These are niche engineered products and services with small volumes. **Position in the value chain.** Tatsuta is a materials and components supplier one or two tiers below the end-product OEM. 1. In semiconductor packaging, its bonding wire is consumed at the wire-bond step of assembly and test (OSATs and integrated device makers). 2. In flexible electronics, its EMI shielding films and conductive bonding films are laminated onto FPCs by FPC makers. The FPCs then go into handset, tablet and camera-module assemblies. 3. In power and building infrastructure, its distribution lines and building wire go to electric utilities, general contractors and electrical wholesalers. Much of the building-wire volume is sold through Sumiden HST Cable. 4. In factory automation, high-strength copper-alloy cables go to robot and machine-tool builders. 5. In data centres, leak-detection cables and systems go to builders and operators of liquid-cooled server facilities. **Customer types.** The company lists electric utilities, telecom carriers, government, electrical machinery, machinery, chemical, railway and construction customers among its main counterparties. Electronics customers include FPC makers and global smartphone OEM supply chains. Medical customers include device makers and hospitals; the UTM acquisition added a national distributor network. **End markets.** Power transmission and distribution, buildings and construction, factory automation and robotics, railways, smartphones and mobile devices, semiconductor packaging, automotive (as a development target), AI data centres, medical devices, and environmental compliance. **Independent characterisation.** Tatsuta is really two companies under one name. The first is a domestic copper-wire business with commodity economics. It is cash-generative in good copper years and depends heavily on Japanese utility and construction spending. The second is a globally competitive specialty-film business that, in its best years, produced most of the group's operating profit: ¥3,813 million of ¥3,532 million consolidated operating income in FY3/2021, before corporate costs. As smartphone volumes stalled from FY3/2022, electronic-materials profit fell by about 70% in three years and wire and cable became the main profit source. Since 2024 a third engine has appeared. Leak-detection systems for AI data centres were small in revenue but expanding capacity 2.5-fold by 2027. Under JX ownership, strategy now centres on using Tatsuta's packaging-material, sensor and medical know-how across the wider JX group rather than on returns to standalone shareholders.