Dentsu Group

A joint venture with marchFIRST: consulting for the internet age (2000)

Key decision·2000· Dentsu Group — the full company history →

Stepping outside the brokerage of advertising space

This joint venture was an early attempt by a company that had grown on brokering advertising space to set foot in a line of business outside it. The ability to lock up television inventory was an overwhelming strength in a market that only went up. But as the internet spread and advertisers began asking hard questions about return on spend, securing space was no longer enough: what was needed was the capacity to advise on corporate strategy itself — and to the structural change that contemporary media had captured in 1998 as “the king at a crossroads,” Dentsu can be seen responding not by building in-house but through a joint venture.

The fact that the partner it chose went bankrupt at home also shows how difficult crossing borders is. The venture could not hold the equal-shareholding design it had started with, and Dentsu lost early the counterpart it was meant to learn American know-how from. That it nonetheless kept the Japanese entity alive suggests Dentsu had not let go of the direction of travel — from advertising agency to full-service consultancy. Whether this groping became the groundwork for the later move into digital, or remained a one-off attempt, is measured in the subsequent changes to Dentsu’s business mix.

Revenue and net margin, FY1995–FY2005

Revenue in ¥ bn (bars) and net margin in % (line), for the years around the decision. Shaded columns are FY2000 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 Dentsu Group


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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  • Sources are primarily each company’s securities reports and other public filings, but errors and omissions may remain.
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Data API

Dentsu Group’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/4324/manifest.json Resource index
GET /api/4324/history.json History overview
GET /api/4324/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/4324/decisions.json Management decisions (index)
GET /api/4324/decisions/{slug}.json One decision (full dossier)
GET /api/4324/executives.json Executives
GET /api/4324/shareholders.json Major shareholders
GET /api/4324/financials.json Financial statements
GET /api/4324/financials-longterm.json Long-term results
GET /api/4324/segments.json Business segments
GET /api/4324/regions.json Sales by region
GET /api/4324/workforce.json Workforce