T-systems Do Brasil Ltda.
Ownership
T-systems Do Brasil Ltda. is ultimately owned by Deutsche Telekom .
Also owned by Deutsche Telekom
T-Home 
Ben NL 
Crnogorski Telekom Similar companies
In Mobile Networks, under different ownership.
Sources
- T-Systems do Brasil Ltda. — GLEIF
Who really owns the brands you use
T-systems Do Brasil Ltda. is ultimately owned by Deutsche Telekom .
In Mobile Networks, under different ownership.