Tokyo, 1901.

Dentsu began with a plan to sell news. The company’s own history says its founder, Hoshio Mitsunaga, had worked as a war correspondent and came away with the idea of a news agency that would supply newspapers with reports and information. To raise the income such a service needed, he started in 1901 with an agency selling newspaper advertisements, and he set up the news agency soon afterwards. English Wikipedia romanises his given name as Hoshiro and dates the start to 1 July 1901, when the advertising side traded as Japan Advertising Ltd. and the news side as the Telegraphic Service Co., or Denpō Tsūshin-sha.

The two businesses did not stay apart for long. Wikipedia says the telegraphic company became Japan Telegraphic Communication Co. in 1906, and that the advertising company merged into it the next year. The company history gives 1907 as the year the two were combined as Nippon Dempo Tsushin-sha, which it translates as Japan Telegraphic Communication Co., Ltd., and which it abbreviates in the same passage as Dentsu. The short name takes its two syllables from that long one: den from dempō, the telegram, and tsu from tsūshin, communication.

The company says it ran as a news agency and an advertising agency together for the next three decades, and that the name was more than a label: its history describes the business making full use of telegraphy, then the newest way to move information, and signing an agreement with the United Press Associations of the United States to receive news over the undersea cable linking Japan and America. In 1936, the company says, it gave up its news service and on 1 June 1936 became a company working only in advertising.

Wikipedia says a radio division followed the arrival of commercial radio broadcasting in Japan in 1951, and that in 1955 Japan Telegraphic Communication changed its name to Dentsu. The infobox on the same page lists Dentsu Advertising, Ltd. from 1955 and Dentsu Inc. from 1978, so the informal abbreviation of the founding era became the legal name of the company half a century after the merger that produced it.

London, 2013, and a group in lower case.

The modern shape of the group was set by a deal with a British company. The Drum reported on 27 March 2013 that Dentsu had completed its acquisition of Aegis Group, a process it said had begun on 12 July 2012 and had been approved at Aegis shareholder meetings on 16 August 2012, with completion delayed by about a month by the Chinese New Year. The magazine said the Aegis networks, among them Carat, iProspect, Isobar and Posterscope, would carry on inside the Dentsu group.

The same report described a new structure. The Drum said Dentsu had created Dentsu Aegis Network Ltd., a global operating unit headquartered in London, to oversee the Dentsu Network, which ran the company’s business outside Japan, together with the operations of Aegis Media. It named Tadashi Ishii as Dentsu’s president and chief executive and Jerry Buhlmann as chief executive of Aegis Media and Dentsu Aegis Network.

The double name did not last. Wikipedia says Dentsu announced in December 2018 that it would reorganise as a holding company, and that the change took effect on 1 January 2020, when most of the operating business moved to a new company under the Dentsu name and the parent became Dentsu Group Inc. In a release dated 28 September 2020, the company said Dentsu Aegis Network would operate under the dentsu brand from early October 2020, with the business organised into media, customer relationship management and creative lines.

Wikipedia notes that the company is stylised as dentsu, in lower case, which is how the group writes its own name in its releases and on its corporate site. The capital letter that headed Dentsu Advertising and Dentsu Inc. falls away in that form, and the telegraph-era abbreviation is set as a single run of small letters.

Initials, lobbies and decks.

Advertising-agency identities are built from unusual raw material. Many agency names began as the surnames of their founders, set side by side or shortened to a run of initials, and over time those initials can become a wordmark that few people read as names at all. Above the agency brands sit holding-company names, which tend to be shorter, more abstract and designed to work on annual reports, stock listings and conference stages rather than on client work.

Because an agency sells ideas rather than packaged goods, its brand surfaces are unusual too. The lobby and reception area act as a shop window for visiting clients and job candidates. House symbols, small objects or colours associated with a founder, can turn up on desks, award shelves and merchandise. Pitch decks, credentials documents and case-study reels carry the identity into rooms the agency does not own, so the type, colour and layout rules have to survive being projected, printed and shared as files.

For a designer, the useful lesson is how a business-to-business identity balances heritage, signalled by founders’ names and dates, against the need to look current to the next client in the room.

A glass tower at Shiodome.

The group’s most visible surface in Tokyo is a building. Wikipedia says the Dentsu Building in Shiodome, Minato, which houses the corporate offices, was designed by the French architect Jean Nouvel and completed in 2002, on the site of the city’s early railway terminus beside the Hama-rikyu Gardens. The Japan Sustainable Building Database, run by the Institute for Building Environment and Energy Conservation, gives a fuller credit: it names Obayashi Corporation as the designer, with Architectures Jean Nouvel of France and the Jerde Partnership of the United States invited as joint design partners.

The same database describes the tower’s two distinguishing features as a boomerang-shaped office floor and a gentle appearance produced by ceramic printed glass with vertical and horizontal gradations. It says the interior was meant to work as an “intelligent production plant” for an advertising and communication company, combining technologies for saving energy and resources.

Wikipedia also records how the group spread its name into new ventures: Dentsu Ventures, a corporate venture capital fund launched in April 2015, and Dentsu Anime Solutions, announced in 2023.

For a design guide, Dentsu shows how a name can outlive the technology it was built from: a telegraph-era abbreviation, shortened again into lower case and carried on glass, paper and screen. Compare Omnicom, a holding company formed from agencies that kept their own names, and WPP, a group whose name also began as an abbreviation. For this guide we use glass, graphite and night with a sans, an unofficial interpretation; no product or logo is reproduced.

Keep Dentsu’s identity on hand — save it to a board in the Made Good inspiration library.