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| 1952 | Nippon Telegraph and Telephone Public Corporation established |
|---|---|
| 1979 | INS Concept announced |
| 1985 | Nippon Telegraph and Telephone Corporation(NTT) incorporated as a private company |
| 1987 | NTT listed on First Section of the Tokyo Stock Exchange |
| 1988 | NTT DATA CORPORATION started operations |
| 1990 | VI&P Concept announced |
| 1992 | NTT Mobile Communications Network, Inc.(presently NTT DOCOMO) started operations |
| 1994 | Basic Concept for the Coming Multimedia Age announced |
| 1995 | NTT DATA listed on Second Section of the Tokyo Stock Exchange |
| 1996 | 21st Century R&D Vision announced |
| 1996 | NTT DATA listed on First Section of the Tokyo Stock Exchange |
| 1997 | Digitization of communications network in Japan completed |
| 1998 | Global Information Sharing Concept announced |
| 1998 | NTT DOCOMO listed on First Section of the Tokyo Stock Exchange |
| 1999 | NTT's operations were reorganized into a holding company structure, and it transferred its businesses to three new wholly owned subsidiaries, NTT East, NTT West, and NTT Communications |
| 2002 | Prefecture-based subsidiaries of NTT East and NTT West started operations |
| 2002 | "Vision for a New Optical Generation" announced |
| 2004 | NTT URBAN DEVELOPMENT CORPORATION listed on First Section of the Tokyo Stock Exchange |
| 2004 | "NTT Group's Medium-Term Management Strategy" announced |
| 2008 | Announced a new Medium-Term Management Strategy, "Road to Service Creation Business Group" |