| Group name | # | ||
|---|---|---|---|
| Zenith | 5 | 53 | 65 |
| Zero Defects | 1 | 17 | 20 |
| Zeus | 5 | 0 | 8 |
| Zenon | 0 | 3 | 7 |
| Zzyfe | 0 | 3 | 5 |
| Zite | 0 | 0 | 4 |
| Zombie Boys | 0 | 0 | 3 |
| Zlorfix | 0 | 0 | 3 |
| Zados Group | 0 | 1 | 2 |
| Zymosis | 0 | 1 | 2 |
| Zigag | 0 | 1 | 2 |
| Zeroline | 0 | 0 | 2 |
| Zhentarim | 0 | 0 | 1 |
| Zero Design | 0 | 0 | 1 |
| Zeltic | 0 | 0 | 1 |
| Zoko | 0 | 0 | 1 |
| Zcoopex | 0 | 0 | 1 |
| Zoom | 0 | 0 | 1 |
| Zounds | 0 | 0 | 1 |
| Zylon | 1 | 0 | 1 |
| Zaxon | 1 | 0 | 1 |
| ZYX | 0 | 0 | 1 |