Nippon Telegraph and Telephone

"NTT" redirects here. For other uses, see NTT (disambiguation).
Nippon Telegraph and Telephone Corporation
Public KK
Traded as TYO: 9432,
Industry Telecommunications
Founded August 1, 1952 (1952-08-01) (as government monopoly)
April 1, 1985 (1985-04-01) (Private Company)
Headquarters Ōtemachi, Chiyoda, Tokyo, Japan
Key people
Hiroo Unoura, President & CEO Satoshi Miura, Chairman
Products Fixed-line and mobile telephony, broadband and fixed-line internet services, digital television, IT and network services
Revenue Increase ¥11.095 trillion (2015)[1]
Increase ¥1.084 trillion (2015)[1]
Increase ¥518 billion (2015)[1]
Total assets Increase ¥20.702 trillion (2015)[1]
Total equity Increase ¥8.681 trillion (2015)[1]
Owner Government of Japan (32.6%)[2]
Number of employees
241,593 (2015)[1]
Subsidiaries NTT Communications
Dimension Data
NTT Data
NTT i3

The Nippon Telegraph and Telephone Corporation (日本電信電話株式会社 Nippon Denshin Denwa Kabushiki-gaisha), commonly known as NTT, is a Japanese telecommunications company headquartered in Tokyo, Japan. Ranked 65th in Fortune Global 500, NTT is the third largest telecommunications company in the world in terms of revenue.

The company is incorporated pursuant to the NTT Law (Law Concerning Nippon Telegraph and Telephone Corporation, Etc.).[3] The purpose of the company defined by the Law is to own all the shares issued by Nippon Telegraph and Telephone East Corporation (NTT East) and Nippon Telegraph and Telephone West Corporation (NTT West) and to ensure proper and stable provision of telecommunications services all over Japan including remote rural areas by these companies as well as to conduct research relating to the telecommunications technologies that will form the foundation for telecommunications.

While NTT is listed on Tokyo, Osaka, New York, and London stock exchanges, the Japanese government still owns roughly one-third of NTT's shares, regulated by the NTT Law.


NTT was established as a government-owned corporation in 1953

Established as a monopoly government-owned corporation in 1952, Nippon Telegraph and Telephone Public Corporation (日本電信電話公社 Nippon Denshin Denwa Kōsha) was privatized in 1985 to encourage competition in the telecom market. In 1987, NTT made the largest stock offering to date, at US$36.8 billion.[4][5]

Because NTT owns most of the last mile (FTTC or FTTB/FTTH), it enjoys oligopolistic control over land lines in Japan. In order to weaken NTT, the company was divided into a holding company (NTT) and three telecom companies (NTT East, NTT West, and NTT Communications) in 1999. The NTT Law regulating NTT East and West requires them to serve only short distance communications and obligates them to maintain telephone service all over the country. They are also obligated to lease their unused optical fiber (dark fiber) to other carriers at regulated rates. NTT Communications is not regulated by the NTT Law.

In July 2010, NTT and South African IT company Dimension Data Holdings announced an agreement of a cash offer from NTT for Dimension Data's entire issued share capital, in £2.12bn ($3.24bn) deal.[6]

In late 2010, NTT's Japan-to-US transpacific network reached 400 Gbit/s. In August 2011, its network capacity was expanded to 500 Gbit/s.[7]

Corporate history timeline


NTT Group consists of the following major companies, divided into five segments. NTT East, NTT West, NTT Communications, NTT DoCoMo, and NTT Data are most major subsidiaries. NTT DoCoMo and NTT Data are listed on the stock markets.


NTT phonebooth

Long distance & international

On July 28, 2011, NTT America announced that it will use Bloom fuel cells at one of its data centers. It will power those Bloom fuel cells with biogas instead of natural gas to be more environmental-friendly.[8]


Data (system integration)

Information security

R&D laboratories [10]


See also


  1. 1 2 3 4 5 6 "Financial Results Release for the Fiscal Year ended March 31, 2011" (PDF). Nippon Telegraph and Telephone Corporation. May 13, 2011. Retrieved July 29, 2011.
  2. "The Japanese National Property System and Current Conditions" (PDF). Ministry of Finance Japan. March 2013. Retrieved May 14, 2014.
  3. English translation of the "Law Concerning Nippon Telegraph and Telephone Corporation, Etc."
  4. Vartan, Vartanig G. (November 9, 1987). "Market Place; Big Stock Sale By Japanese". The New York Times.
  6. "NTT buys South Africa's Dimension Data". BBC News. July 14, 2010. Retrieved July 14, 2010.
  7. Sean Buckley, Fierce Telecom. "NTT's Japan to U.S. network route reaches 500 Gbps mark." Aug 3, 2011. Retrieved Aug 4, 2011.
  8. Katie Fehrenbacher, GigaOm. "Bloom Energy attracts data center operators in Cali." Jul 28, 2011. Retrieved Aug 4, 2011.
  9. "Integralis".
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