Dentsu

• 1. Introduction

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  Dentsu, Japan's largest advertising agency, holds a grip on its home market so complete that it handles roughly 28 percent of the entire national advertising budget. That number alone raises a question worth sitting with. How does any single company come to control more than a quarter of a country's commercial speech? The answer reaches back more than a century, through telegraphs and newspapers, through postwar radio and the birth of Japanese television, through a skyscraper designed by a French architect and built on the site of Tokyo's first railway station. Along the way, Dentsu wove itself into the fabric of Japanese public life so tightly that The New York Times once called it "the unofficial communications department of the governing Liberal Democratic Party." It also became the site of a tragedy that forced Japan to confront the human cost of its work culture, and a corruption scandal that reached all the way to the 2020 Summer Olympics. This is the story of an institution that is, by almost any measure, more than an advertising company.

• 2. Telegraph Roots

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  Dentsu did not begin as an advertising agency. Its origins lie in the twin businesses of telegraphy and news wire service, founded under names that reflected both functions. In 1906, the telegraphic arm of the business became a distinct entity, and just one year later the company's two predecessor organizations merged to unite advertising and communications under one roof. That dual identity, part press agency and part ad seller, gave the company reach that pure advertisers could not match.

  For nearly three more decades the news wire side remained, until 1936, when the company sold its news division to Doumei News Agency. The move was a strategic pivot toward specialized advertising, shedding journalism to sharpen commercial focus. Seven years later, in 1943, the company absorbed 16 other firms to bulk up its advertising capacity, and opened operational bases in Tokyo, Osaka, Nagoya, and Kyushu in the same year.

  Commercial radio came to Japan in 1951, and the company moved quickly. A Radio Division was established at both the head office and local offices to capture the new medium. That instinct to plant a flag in each emerging channel was not accidental; it was the pattern that had defined the company since its telegraphic beginnings. By 1955, the company had settled on the name it still carries: Dentsu Inc.

• 3. A Costly Typo

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  Dentsu joined the Tokyo Stock Exchange in 2001, and its initial public offering in December of that year produced one of the more spectacular errors in financial market history. A trader at UBS Warburg, the Swiss investment bank, entered an order to sell 610,000 shares at 6 yen each. The intended order was the reverse: 16 shares at 600,000 yen apiece. The mistake was not caught in time. UBS Warburg lost 71 million pounds.

  The incident became a reference case for the risks of fat-finger trading errors in electronic markets. For Dentsu itself, the listing was a milestone rather than a setback; the company's market position remained unshaken. Its sales in Japan were already more than double those of its nearest rivals, Hakuhodo and ADK, a gap that the company's early dominance in media representation had made possible. Dentsu had produced Japan's first newspaper advertisements and its first television commercials, establishing relationships with media owners that competitors could not easily replicate decades later.

• 4. Global Expansion

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  Dentsu's move into international markets came in stages, often through acquisition. In July 2003, it purchased Pioneer LDC from Pioneer Corporation and rebranded it Geneon Entertainment, while the North American arm became Geneon USA. The entertainment business changed hands again in early 2009, when Dentsu sold 80.1 percent of Geneon to NBCUniversal's Universal Pictures International Entertainment, which merged it with Universal Pictures Japan.

  The bigger leap came on the 12th of July 2012, when Dentsu agreed to buy British-based Aegis Group plc for $4.9 billion in cash. The deal closed in March 2013 and gave Dentsu a network managing media work outside Japan under the Dentsu Aegis Network banner. That structure lasted until September 2020, when Dentsu Group announced that the international business would simply operate under the dentsu brand, organized into three lines: media, customer relationship management, and creative. The British entity was formally registered as Dentsu International Limited with UK Companies House in October 2020.

  Acquisitions continued on smaller scales. In August 2023, Dentsu bought RCKT, a Berlin-headquartered digital-first agency, retaining its name during integration as "RCKT, a Dentsu Creative Company." In 2018 it had acquired GlobalMind, a Latin American digital agency co-founded by Andy Berman and Marcelo Montefiore and based out of Argentina and Miami, which held the distinction of being the top independent media agency in the LATAM region. And in April 2015, Dentsu launched Dentsu Ventures, a corporate venture capital fund offering capital and business support to companies across the United States, Europe, and Asia. Its first fund, Dentsu Ventures Global Fund I, launched the same month with five billion yen. A second fund, launched in May 2021, carried ten billion yen, and its portfolio came to include companies such as GRAIL, Twist Bioscience, and Upside Foods.

• 5. The Death of Matsuri Takahashi

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  In August 2015, Japanese authorities found that Dentsu had been allowing employees to work beyond its own stated limit of 70 hours of monthly overtime. The company's internal rules had been broken by the company itself. That December, a 24-year-old Dentsu employee named Matsuri Takahashi, a University of Tokyo graduate, died by suicide. The Japanese government classified her death as karoshi, the Japanese term for death caused by overwork.

  The legal response came in July 2017, when Japanese authorities charged the corporation, not any individual, with responsibility for her death. Dentsu admitted that it had permitted illegal levels of overtime. In October 2017 the company was convicted and paid a fine of 500,000 yen. The penalty was small by any financial measure, but the conviction of one of Japan's most powerful corporations for a labor violation drew sustained public attention.

  Tadashi Ishii, the company's Representative Director and President and CEO, had already announced on the 28th of December 2016 that he would resign. His papers were sent to the prosecutors' office in connection with the violation of the Labor Standards Act. The New York Times documented more than half a century of ongoing overworking at the company, including training materials in which a former Dentsu president urged employees to work "even if it kills you." A 2017 initiative encouraging workers to leave the office at 3 p.m. on the last Friday of each month drew little participation. A former executive creative director at Dentsu Japan also resigned from his own company that year after allegations of sexual harassment during his tenure at the firm.

• 6. Olympics and Corruption

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  Dentsu's relationship with Japan's bid for the 2020 Summer Olympics came under scrutiny well before criminal charges arrived. Reuters reported in 2020 that Haruyuki Takahashi, a former Dentsu executive who later joined the Tokyo 2020 organising committee board, had received more than eight million US dollars from the Tokyo bid committee for activities that were never publicly disclosed. Takahashi told Reuters that his work had included lobbying members of the International Olympic Committee, among them former athletics official Lamine Diack, and that he had given gifts including a Seiko watch and digital cameras. IOC president Thomas Bach later said that the IOC had confirmed the payments did not break IOC rules.

  Criminal consequences followed in 2022, when a different former Dentsu executive was arrested on suspicion of accepting bribes from Olympic sponsors. In February 2023, Japan's competition regulator filed criminal complaints against six companies, Dentsu among them, for alleged bid rigging of contracts related to the games. The accusation was that the firms had reduced the competitiveness of their own tenders, a violation of anti-monopoly law. A senior Japanese Olympic official and the head of Dentsu's sports division were both arrested. The company admitted liability.

  The fallout extended beyond Tokyo. Sapporo had been considered an early favorite to host the 2030 Winter Olympics, but the corruption scandal clouded its chances. Dentsu's reach into Japanese institutional life had made it indispensable to the Olympic machinery; that same reach now made it a central figure in one of the country's most damaging sports governance scandals.

• 7. The Building and the Mountain

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  Dentsu's Tokyo headquarters occupies a building that is itself an architectural statement. Rising 48 floors to 213.34 meters, or 700 feet, the Dentsu Building in Shiodome, Minato, stands as the eleventh-tallest structure in Tokyo. It was designed by Jean Nouvel, the French architect, and completed in 2002. The ground beneath it carries its own history: the building sits on the site of Tokyo's first railway station, next to the Hamarikyu Gardens, which was once the vacation home of a shogun.

  Alongside that physical monument, Dentsu maintains a human one. Since 1925, the company has sent its employees up Mount Fuji every July. Every new staff member and every newly promoted executive climbs the mountain together. Those physically unable to make the ascent are exempt. A former employee explained the tradition's meaning this way: the message is that conquering the one symbol that represents Japan more than anything else means the company can do anything. For an organization that grew from telegraphs into a global network handling a quarter of Japan's advertising spending, it is a fitting ritual. Mount Fuji, after all, looks the same from every angle but rewards those who climb it with a view no one else gets to see.