| Group name | # | ||
|---|---|---|---|
| Oracle | 23 | 0 | 36 |
| Ozone | 0 | 7 | 16 |
| Outlaws | 1 | 8 | 14 |
| OKS | 0 | 7 | 13 |
| Obsession | 0 | 11 | 13 |
| Oxygen | 1 | 8 | 10 |
| Oxygene | 3 | 4 | 8 |
| Odyssey | 0 | 1 | 7 |
| Orb, The | 0 | 5 | 7 |
| Ozone Free | 0 | 1 | 6 |
| Oxyron | 0 | 4 | 6 |
| Origin | 0 | 5 | 6 |
| Omicron | 0 | 4 | 6 |
| Omega | 0 | 5 | 6 |
| Oblivion | 5 | 0 | 6 |
| Offworld | 0 | 2 | 6 |
| Orient | 1 | 0 | 5 |
| Orbital | 0 | 3 | 5 |
| Old Bulls | 0 | 4 | 4 |
| Obscene | 0 | 3 | 4 |
| Overlords | 0 | 3 | 4 |
| Offence | 0 | 3 | 4 |
| Organized Crime, The | 0 | 1 | 3 |
| Overload | 0 | 2 | 3 |
| Optical | 0 | 2 | 3 |
| Olmecs | 0 | 0 | 2 |
| Ordeal | 0 | 0 | 2 |
| Opus | 0 | 0 | 2 |
| Over the Top | 0 | 1 | 2 |
| Outsiders | 0 | 1 | 2 |
| Opec | 0 | 1 | 2 |
| Obelisk & Xcalibur | 0 | 2 | 2 |
| ODIN | 0 | 0 | 2 |
| Odissey | 0 | 1 | 1 |
| Off2 Crew | 0 | 1 | 1 |
| Outlaw PD | 0 | 1 | 1 |
| Overflow | 0 | 0 | 1 |
| Overflow (old) | 0 | 0 | 1 |
| Overkill | 0 | 1 | 1 |
| Obstacle | 0 | 0 | 1 |
| Oz | 1 | 0 | 1 |
| Outlanders | 0 | 1 | 1 |
| Orion Austria | 0 | 1 | 1 |
| Orion 5 | 0 | 1 | 1 |
| Orion (old) | 0 | 1 | 1 |
| Orion | 0 | 1 | 1 |
| Optimal | 0 | 0 | 1 |
| Optical Illusions | 0 | 1 | 1 |
| Opal | 0 | 1 | 1 |
| Onyx | 0 | 0 | 1 |
| Ontarion | 0 | 0 | 1 |
| One, The | 0 | 1 | 1 |
| One Man | 0 | 1 | 1 |
| Ominous | 0 | 1 | 1 |
| Omen | 0 | 1 | 1 |
| Omega (old) | 0 | 0 | 1 |