Company history

Dentsu began as two businesses under one roof. In July 1901 Mitsunaga Hoshiro founded Nihon Kokoku (Japan Advertising) in Tokyo with capital of ¥100,000; four months later, in November, he opened a news agency, Denpo Tsushinsha, in the same building. The pairing was the strategy. Newspapers were the only mass medium of late-Meiji Japan and they controlled the ad space Dentsu had to buy — so Dentsu sold them wire copy and took their advertising inventory in return. Rather than pass space from one hand to the other like a broker, it held something the supplier needed.

The two halves were formally merged in 1907, with capital raised to ¥260,000. The combination made possible things a pure agency could not do: discounting advertising rates against wire-service fees, feeding scoops to advertisers, selling itself as an agency that came with a news source attached. Through the Taisho years and into the early Showa period Dentsu held the largest share of newspaper advertising billings in Japan.

Then the state took half the model away. In June 1936, under wartime control of the news business, Dentsu’s wire division was folded into the newly created Domei Tsushinsha; in exchange Dentsu absorbed the advertising department of Domei’s predecessor and raised its capital to ¥2m. What had been a two-legged company for thirty-five years became an advertising company — not by choice, but as the price of the deal. It proved decisive. Renamed simply Dentsu in July 1955, it entered the age of commercial television as a pure advertising agency, free of the conflict between newsroom and ad desk that owning a wire service would have forced on it.

From the late 1950s Dentsu built the full-service agency model around television: securing programme sponsorship slots for advertisers and producing the commercials that filled them. The structure it grew was domestic and layered — head office moved to Tsukiji in 1967, capital was raised repeatedly through the boom years, five regional Dentsu companies were spun up in 1994 to put the national sales network into subsidiaries, and promotion work was consolidated into Dentsu Tec in 1996. As long as television advertising kept growing, that self-contained pyramid kept Dentsu first in the Japanese market.

One piece of it pointed elsewhere. Dentsu founded ISID in 1975 as a joint venture with General Electric Information Services, parking systems and data-processing capability in a separate company away from the labour-intensive brokerage that was the parent’s actual trade. ISID listed on the First Section of the Tokyo Stock Exchange in November 2000 — the subsidiary going public a year before the parent — and the capability it accumulated became the group’s foothold in digital marketing decades later.

By 1998 the pressure was visible even though the numbers were not. Sales were at a record and Dentsu held more than 20% of the market, yet the fragmentation of media, advertisers demanding measurable returns, and the arrival of foreign agencies were all eroding the one thing Dentsu was built on: the ability to secure space. The response was reorganization of the sales divisions plus preparation for a listing and for overseas expansion — and, in 2000, a joint venture with the American internet consultancy marchFIRST, an attempt to acquire, through a partner rather than in-house, the advisory capability that selling space no longer supplied.

Dentsu itself listed on the First Section of the Tokyo Stock Exchange in November 2001, a hundred years after its founding, with capital of $485.2M (¥59bn). Advertising agencies had long avoided going public on the grounds that they sit inside their clients’ confidential plans, and Dentsu broke that convention with almost no need for money — net proceeds of about $73.2M (¥9bn). What the listing actually delivered was a currency and a discipline: shares that could be used in acquisitions, and a governance regime built for disclosure.

It came just as the domestic market turned. Japanese advertising expenditure peaked around 2000 at roughly ¥6.1 trillion and stopped growing; internet advertising rose as newspapers, magazines and television declined. Through 2012 consolidated sales sat in the ¥1.9 trillion range with operating profit of ¥50–60 billion, and no amount of additional domestic sales coverage was going to change the trajectory. Overseas revenue was still in the low teens as a share of the total, far behind WPP and Omnicom, even though the Japanese manufacturers Dentsu served had globalized long before.

The acquisitions Dentsu had made in Europe and the United States during the 2000s were small and one-off, never enough to move its global ranking. What changed the calculus was timing: European agency groups were cheap after the 2008 crisis, the yen was strong, and Dentsu had a decade of listed-company balance sheet behind it. In 2011 the presidency passed from Takashima Tatsuyoshi to Ishii Tadashi, and the search for a target large enough to matter began in earnest.

In March 2013 Dentsu acquired the entire share capital of Britain’s Aegis Group plc under a UK scheme of arrangement — about $4.1B (¥400bn), the largest cross-border deal ever done by a Japanese advertising company — and renamed it Dentsu Aegis Network the same day. Overseas revenue jumped from 14% of the total to 42%, putting Dentsu fifth among global advertising groups, and consolidated sales went from ¥1,941.2 billion in FY13 to ¥4,642.3 billion in FY14, a 2.4-fold increase. Dentsu had not built a global network; it had bought a finished one, and most of what it paid sat on the balance sheet as goodwill.

The buying continued. Mid-sized agencies across Europe, North America and the emerging markets were absorbed, and in September 2016 the American firm Merkle brought CRM and data-marketing capability into the group. The same year Dentsu switched to a company with an audit and supervisory committee, set up Dentsu Digital to run domestic digital as a dedicated business, and named data-driven marketing — CT&T — as its growth field. The ambition was to sell the design and operation of a client’s whole marketing programme rather than media space. The cost was a double burden: goodwill accumulating with each deal, and integration expense incurred while every acquired brand was left standing.

Two things then came due at once. The suicide of a first-year employee in December 2015 led to a labour-inspectorate raid and criminal referral in 2016, and to sustained criticism of a culture that tolerated extreme hours; Ishii resigned to take responsibility and Yamamoto Toshihiro succeeded him in January 2017, charged with reforming working practices and integrating a 60,000-person global organization at the same time. And the acquired overseas businesses did not earn what had been assumed: FY2019 brought goodwill impairment, an operating loss of ¥3.3 billion and a net loss of ¥80.8 billion — the first operating loss since the Aegis deal.

In January 2020 Dentsu moved to a pure holding-company structure as Dentsu Group Inc., splitting the advertising business into a new operating company that took the Dentsu name and placing the overseas and domestic networks side by side. Merkle was taken fully in-house in April, and in September Dentsu Aegis Network became Dentsu International: seven years after the acquisition, the judgement was that leaving acquired brands to run themselves had not produced efficiency, and the group was consolidated under a single name with regional profit responsibility pulled back to the centre. Then the pandemic hit the one line item clients cut first, and FY2020 closed with an operating loss of ¥140.6 billion and a net loss of ¥159.6 billion.

FY2021 looked like vindication. Gross profit of ¥976.5 billion, adjusted operating profit of ¥179.0 billion, an 18.3% operating margin — all records — and net income of ¥108.3 billion. Yamamoto upgraded the medium-term plan: 4–5% organic gross-profit growth to 2024, ¥250–300 billion earmarked for further M&A in CT&T, a record dividend and a buyback of up to ¥40 billion. In hindsight the year was a peak built on post-pandemic rebound demand and a global surge in digital advertising, and the response to it was to accelerate the same acquisition strategy.

The reckoning followed. FY2024 carried ¥210.1 billion of goodwill impairment overseas and a net loss of ¥192.1 billion, the largest in the company’s history; in February 2025 Dentsu Group used its 2025–2027 medium-term plan to disown the M&A-heavy path and return to organic growth, promising to eliminate loss-making overseas markets with more than ¥10 billion of cumulative invested capital by FY2026 and holding exit open for regions in a second consecutive year of losses. Unwinding proved harder than declaring: impairment ran into FY2025 as well, with an operating loss of ¥289.2 billion and a net loss of ¥327.6 billion, attempts to sell overseas businesses failed to attract buyers, and the leadership itself was replaced. Growth that was bought turns out not to be easily returned.