Japan Telecom (1st era, 1984–1989, 2nd era, 1989–2002, 3rd era, 2002–2006)
1984–2006
Railway telecommunication
1986–19??
International Telecom Japan
1986–1997

Softbank Telecom
2006–2007 (1st era), 2007–2015 (2nd era)
2006–2010
2010–2015
| Subsidiaries and investments: eAccess (E MOBILE) | SB Creative | SBI Group | SoftBank Mobile | SoftBank Telecom | T-Mobile US (Other) | Willcom | GoTo (Gojek | Tokopedia) | Grab (Ovo)
Sponsorships: Former assets: Notes |