| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | O Elvas | Sports team | 1 |
| 2 | O.F.I Kriti | Sports team | 2 |
| 3 | O'Higgins Rancagua | Sports team | 1 |
| 4 | Oakland Golden Grizzlies | Sports team | 1 |
| 5 | Oaxaca | Sports team | 1 |
| 6 | Oberena | Sports team | 1 |
| 7 | Obra Koscian | Sports team | 1 |
| 8 | Octavio Espinoza | Sports team | 1 |
| 9 | Odd Grenland BK | Sports team | 1 |
| 10 | Odense BK | Sports team | 1 |
| 11 | Odense Bulldogs | Sports team | 1 |
| 12 | Odessa Jackalopes | Sports team | 1 |
| 13 | Odessa Roughnecks | Sports team | 1 |
| 14 | Odivelas | Sports team | 1 |
| 15 | Odra Opole | Sports team | 1 |
| 16 | Odra Wodzislaw | Sports team | 1 |
| 17 | Oeste Futebol Clube | Sports team | 1 |
| 18 | OFC Charleville | Sports team | 1 |
| 19 | Offaly County | Sports team | 1 |
| 20 | Offenburger FV | Sports team | 1 |