Japan Steel Works

Splitting the materials and energy business into JSW M&E — and merging it back six years later (2020)

Key decision·2020· Japan Steel Works — the full company history →

The form of the organisation follows the state of the business

The 2020 separation was not a device for pushing a loss-making business away from the consolidated accounts. The condition set out in the disclosure was to "establish a stable profit structure at the business's present scale" — that is, to reach profit without shrinking. Against a Muroran where structural losses had survived cumulative job cuts of 900 between 1986 and 1998, the answer to a search for a remedy other than cutting people appears to have been this: bind manufacturing, inspection and maintenance into one company and make it answer for its own results.

That it was folded back within six years shows, though, that separation was never the object. The reasons given for the reversal — the return to nuclear power, defence-related equipment, gallium-nitride crystals — were none of them demands visible to the company in 2020. When demand comes back, people and plant are easier to move if they sit inside the parent. The form of the organisation follows the state of the business, not the other way round; that is how this decision reads. The improper inspection practices that came to light in May 2022 show, however, that governance at the separated company did not come right as quickly as the profits did.

Revenue and net margin, FY2015–FY2025

Revenue in ¥ bn (bars) and net margin in % (line), for the years around the decision. Shaded columns are FY2020 onwards — after it was taken.

Source: securities reports

Read the full dossier in Japanese →

The Japanese edition carries the complete record of this decision — the situation that forced it, the options weighed, what actually followed, and the sources behind every claim.

Other key decisions at Japan Steel Works


Yen amounts are converted at the average rate of each figure’s own year — not today’s rate; the revenue chart is shown in yen. Exchange rates & sources — the full ¥/US$ table →


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Data API

Japan Steel Works’s history, financials, executives and shareholders are published as static JSON — no key, plain GET. Full specification →

Method Endpoint Returns
GET /api/companies.json All companies
GET /api/5631/manifest.json Resource index
GET /api/5631/history.json History overview
GET /api/5631/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/5631/decisions.json Management decisions (index)
GET /api/5631/decisions/{slug}.json One decision (full dossier)
GET /api/5631/executives.json Executives
GET /api/5631/shareholders.json Major shareholders
GET /api/5631/financials.json Financial statements
GET /api/5631/financials-longterm.json Long-term results
GET /api/5631/segments.json Business segments
GET /api/5631/regions.json Sales by region
GET /api/5631/workforce.json Workforce