ENVALITH
住友電気工業株式会社 logo

Sumitomo Electric Industries, Ltd.

5802・Prime Market・Nonferrous Metals

Official website
住友電気工業株式会社 logo
Sumitomo Electric Industries, Ltd.5802

Business

Sumitomo Electric Industries, founded in 1897, is a comprehensive electric and electronic parts manufacturer operating five business segments: Environment & Energy, Information & Communications, Automotive, Electronics, and Industrial Materials. The company offers a wide range of products including Power Cables & Transmission/Distribution Wires, Optical Fiber & Optical Cable, Wiring Harness, Flexible Printed Circuits (FPC), and Carbide Tools & Diamond/CBN Tools, with major customers including domestic and overseas electric utilities, telecommunications carriers, automakers, and electronics manufacturers. With consolidated net sales of ¥5,110,171 million and approximately 300,000 employees, it is a global enterprise listed on the Prime Market of the Tokyo, Osaka, and Nagoya Stock Exchanges.

Business Model

Centered on proprietary materials technology and manufacturing process technology for conductive materials, polymer materials, compound semiconductors, and other materials, the company manufactures and sells high-performance products for power infrastructure, communications infrastructure, automotive, and electronic equipment applications. The Automotive Business is the largest segment, accounting for approximately 57% of net sales, but Information & Communications (operating margin of 23.7%) and Environment & Energy drive high profitability. The company maintains technological superiority by investing ¥162,858 million in R&D, while expanding production capacity through capital expenditures of ¥243,183 million, forming a structure that improves profit margins through economies of scale and improved product mix.

Company Strengths

The company holds Sumitomo Wiring Systems as a wholly owned subsidiary and has a world top-class share in Wiring Harness. It operates an extensive network of manufacturing bases across North America, Europe, and Asia, with Automotive Business revenue reaching ¥2,937,168 million in FY2026 (ending March 2026). The full consolidation of Sumitomo Riko as a wholly owned subsidiary (February 2026) added the Anti-vibration Rubber & Automotive Hoses business, further strengthening the group's overall capabilities.

The company developed and mass-produced the world's first mass-production multi-core fiber and ultra-low-loss optical fiber, and possesses high technological competitiveness in Optical Wiring Products, Optical Devices & InP Substrates for data centers. In FY2026 (ending March 2026), the Information & Communications Business achieved revenue of ¥326,632 million with an operating margin of 23.7%. The company continues to expand its production and development capabilities, including the construction of a new R&D building at the Yokohama Works.

The equity ratio stood at 56.9% (up 5.3 percentage points year on year), and net interest-bearing debt was ¥473,881 million, reflecting high financial soundness. The company has obtained high credit ratings of "AA/J-1+" from JCR and "AA-/a-1+" from R&I. It secured positive free cash flow of ¥250,330 million, giving it the financial strength to fund the ¥1 trillion in cumulative capital expenditure planned over three years under the Medium-Term Management Plan 2028 primarily through its own funds.

ENVALITH's Perspective

In FY2026 (ending March 2026), the Information & Communications Business achieved net sales of ¥326,632 million (up 46.3% year on year) and operating income of ¥77,435 million (up approximately 3.8x year on year), rapidly expanding to a sales-to-operating-income margin of 23.7%. The increase in demand for optical devices and optical wiring products for data centers, driven by the expansion of the generative AI market, is judged to be structural in nature. For FY2027 (ending March 2027), the Information & Communications Business is projected to achieve net sales of ¥500,000 million (up 53% year on year), a high growth forecast, though there remains room for upside depending on the progress of production capacity expansion.

In FY2026 (ending March 2026), net income attributable to owners of the parent rose significantly to ¥369,508 million (up 90.7% year on year); however, this includes a gain on sale of affiliate shares of ¥79,154 million recorded as extraordinary income from the sale of Sumitomo Densetsu Co., Ltd. shares. Excluding this one-time factor, underlying net income on a real basis would be correspondingly lower. For FY2027 (ending March 2027), the company itself forecasts net income of ¥320,000 million (down 13.4% year on year), a decline, and it will be necessary to assess the underlying earnings level once this one-time gain drops out.

The Automotive Business, which accounts for approximately 57% of net sales, is susceptible to supply chain disruptions caused by the review of U.S. trade policy and the slowdown of the Chinese economy. In FY2026 (ending March 2026), operating income for the Automotive Business was ¥179,700 million (up 4.2% year on year), a modest increase in growth compared to other segments. While synergy effects from making Sumitomo Riko Company Limited a wholly owned subsidiary are anticipated, if deterioration in the external environment becomes apparent, the impact on the group's overall performance would be significant, requiring continuous monitoring.

Growth Strategy

Aiming for substantial growth in net sales and operating profit through Mid-term Management Plan 2028, centered on the three fields of 'Digital/AI, Energy, and Mobility'

In Mid-term Management Plan 2028, which begins in FY2026 (ending March 2026), the Group aims to leverage its comprehensive group strength across the three focus fields of 'Digital/AI,' 'Energy,' and 'Mobility' as well as convergence areas, targeting net sales of ¥6 trillion, operating profit of ¥600.0 billion, and pre-tax ROIC of 15% or higher in FY2028.

Promoting increased production capacity for Optical Wiring Products (Optical Connectors, etc.), Optical Fiber & Optical Cable, and Optical Devices & InP Substrates for data centers, driven by the expanding generative AI market. In FY2026 (ending March 2026), achieved net sales of ¥326,632 million and operating profit of ¥77,435 million (operating margin of 23.7%), with net sales of ¥500,000 million forecast for FY2027 (ending March 2027).

Made Sumitomo Riko Company Limited a wholly owned subsidiary in February 2026 (payments for acquisition of subsidiary shares of ¥112,688 million). Aiming to create integration synergies with the automotive Anti-vibration Rubber & Automotive Hoses business and drive business growth with a focus on developing new products for next-generation mobility. Expected to contribute to strengthening profitability and improving asset efficiency in the Automotive Business.

Advancing the launch of a new European base for power cables while focusing on domestic equipment renewal demand and orders for national and regional interconnection lines related to renewable energy. In FY2026 (ending March 2026), achieved Environment & Energy Business net sales of ¥1,178,780 million and operating profit of ¥90,615 million. Net sales of ¥1,060,000 million are forecast for FY2027 (ending March 2027).

Working to improve asset efficiency through reduction of inventory and cross-shareholdings, with pre-tax ROIC improving to 14.7% (from 9.3% in the previous fiscal year). The dividend was raised to ¥154 per share in FY2026 (ending March 2026), an increase of ¥57 year on year, and a 4-for-1 stock split will be implemented effective July 1, 2026 to expand the investor base.

Last updated: July 19, 2026