Taisei Corporation

Indicted over the maglev bid-rigging — and denying that it was collusion (2018)

Key decision·2018· Taisei Corporation — the full company history →

The author’s view

There was a logic of its own to Taisei’s denial: on the projects that mattered most, it had lost. In a peculiar form of tendering where both the winner and the price rest on the client’s discretion, at what point does exchanging information become illegal collusion? The attempt to have that line drawn in court can be read as raising a question different from mere defiance. The distance between Taisei and the two firms that admitted the charge and hurried to close the matter was also a difference in how they saw the facts.

Even so, the company itself acknowledged that order co-ordination had taken place, and the weight of that remains: at the height of record profits, the arrangement by which difficult work was shared out had not broken down. Choosing to fight from inside rather than open the matter to outside investigation also, apart from the case argued in court, deferred the chance to release the company from the closed logic of its industry. How that decision has worked on the rebuilding of trust is something still to be judged against the orders it wins and the way it is actually governed.

Revenue and net margin, FY2013–FY2023

Revenue in ¥ bn (bars) and net margin in % (line), for the years around the decision. Shaded columns are FY2018 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 Taisei Corporation


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

Taisei Corporation’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/1801/manifest.json Resource index
GET /api/1801/history.json History overview
GET /api/1801/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/1801/decisions.json Management decisions (index)
GET /api/1801/decisions/{slug}.json One decision (full dossier)
GET /api/1801/executives.json Executives
GET /api/1801/shareholders.json Major shareholders
GET /api/1801/financials.json Financial statements
GET /api/1801/financials-longterm.json Long-term results
GET /api/1801/segments.json Business segments
GET /api/1801/regions.json Sales by region
GET /api/1801/workforce.json Workforce