TOSOH CORPORATION
4042・Prime Market・Chemicals
Business
Tosoh Corporation is an integrated chemical manufacturer founded in 1935, forming a group that includes 89 consolidated subsidiaries and 15 equity-method affiliates. Its business is organized into two segments: the "Chain Business" (Petrochemicals and Chlor-Alkali, originating from salt electrolysis and naphtha cracking) and the "Advanced Business" (Performance Products and Engineering). Its major customers span a wide range of industries, including automotive, semiconductor, biopharmaceutical, building materials, and food. Domestically, it operates large-scale integrated complexes in Nanyo, Yokkaichi, and Hyuga, among others. Overseas, it has manufacturing and sales bases across Asia, North America, and Europe, conducting business on a global scale. Consolidated net sales for FY2026 (ending March 2026) were ¥1,019,917 million.
Business Model
The company's foundation is a vertically integrated model built around the large-scale Nanyo and Yokkaichi combines, starting from salt electrolysis and naphtha cracking and extending through to integrated manufacturing of Caustic Soda, PVC, MDI, polyethylene and other products. The structure secures stable volume-driven earnings through the chain businesses, while high-value-added products and services in the Performance Products Segment (operating margin of 14.6%) and Engineering Segment (21.7%) lift overall profitability. Capital expenditure is planned at ¥220.0–250.0 billion over the three-year medium-term plan, with capacity expansion in growth areas and decarbonization initiatives advanced in parallel.
Company Strengths
The Yokkaichi Complex houses the only naphtha cracker in the Chukyo region, enabling an integrated production system for olefins and polymers. This is a regionally monopolistic piece of infrastructure that competitors cannot easily replicate in the short term, and it supports a stable supply capability for specific applications such as HDPE resin used in high-purity chemical containers for semiconductors. Production value for the Petrochemicals Segment in FY2026 (ending March 2026) was ¥196,332 million.
The Engineering business, centered on subsidiary Organo Corporation, achieved net sales of ¥186,412 million, operating income of ¥40,383 million, and an operating margin of 21.7% in FY2026 (ending March 2026). Water treatment plant projects for advanced semiconductor manufacturers in Japan, Taiwan, and the United States progressed smoothly, resulting in a 10.1% year-on-year increase in net sales and a 20.1% increase in operating income. Stable revenue from Facility-Based Services and Maintenance and other offerings is also accumulating.
The Performance Products Segment achieved net sales of ¥272,858 million, operating income of ¥39,933 million, and an operating margin of 14.6% in FY2026 (ending March 2026). Separation and purification agents for biopharmaceuticals began commercial operation at the Nanyo Complex in May 2026, with a new facility also under construction at the Yokkaichi Complex scheduled for spring 2027. Shipments of high-performance materials such as High-Silica Zeolite and Zirconia, and bromine continue to increase across multiple applications.
ENVALITH's Perspective
Performance Trend
Net sales came to ¥1,019,917 million (down 4.1% year on year), marking the first decline in two periods. The main causes were falling selling prices due to lower naphtha prices (¥65,225/KL, down ¥10,425/KL year on year) and sluggish demand in China. Operating income was ¥95,532 million (down 3.4% year on year), a relatively modest decline supported by an improvement in terms of trade (the decline in raw material and fuel prices exceeded the decline in selling prices) and expansion of the Engineering business. Ordinary income rose to ¥106,752 million (up 3.6% year on year), aided by the recording of ¥6,569 million in foreign exchange gains. However, due to the recording of ¥19,572 million in impairment losses, profit attributable to owners of parent came to ¥41,615 million (down 28.3% year on year), the lowest level in the past five fiscal years. Looking at operating income over the past five fiscal years, it peaked at ¥144,045 million in FY2022, subsequently declined, and then recovered to ¥98,906 million in FY2025, before retreating slightly again to ¥95,532 million in FY2026.
Growth Strategy
Pursuing the 'dual achievement of growth and decarbonization' through capacity expansion in advanced businesses and decarbonization investment
Capacity expansion equipment at the Nanyo Complex began commercial operation in spring 2026. In addition, newly installed equipment at the Yokkaichi Complex is expected to begin commercial operation in spring 2027. The company is also focusing on developing innovative technologies for biopharmaceutical manufacturing processes (continuous chromatography, pre-packed columns), strengthening the earnings base of the Performance Products Segment.
Decided to expand production capacity for Chloroprene Rubber, for which mid- to long-term market growth is expected. Commercial operation is scheduled to begin in spring 2030, contributing to an increase in the ratio of value-added products and expansion of mid- to long-term sales volume in the Petrochemicals Segment.
In response to continued demand growth in Southeast Asia for MDI, the company established Tosoh Vietnam Polyurethane Co., Ltd. in Vietnam and is constructing a crude MDI splitter (scheduled to begin operation in spring 2027). Capacity expansion for Hexamethylene Diisocyanate (HDI)-Based Hardener derivatives is planned for summer 2026, promoting higher value-added products in the Chlor-Alkali Segment.
A biomass power plant was constructed at the Nanyo Complex and began operation in May 2026. This achieves CO2 emissions reduction and expanded use of renewable energy in the energy-intensive Chlor-Alkali Segment, functioning as a concrete initiative toward achieving decarbonization targets.
In the medium-term management plan with FY2028 (ending March 2028) as the final year, the company has set a target total return ratio of 50%. While continuing dividends with a minimum of ¥100 per share annually, the company plans to conduct share buybacks totaling ¥500 million over three years. The first phase of ¥250 million was completed between August 2025 and March 2026, and the timing for implementing the remaining ¥250 million is under consideration.
At the Board of Directors meeting held on April 21, 2026, a resolution was passed to change the reportable segments. The company will reorganize from the previous four categories into five categories—"Basic Materials," "Value-Added Materials," "Bioscience," "Advanced Materials," and "Water Treatment Engineering"—transitioning to an organizational structure reflecting the business portfolio strategy of the medium-term management plan, effective from June 2026.
Last updated: July 19, 2026