Glentoran played 30 league seasons and cup tournaments in the data, 1963 to 2010. Success weighs every finish by how hard that competition was to win; Efficiency is the share of what the club could have won that it did win; Edge compares that with an average participant (×1.00).
| 871 | São Paulo AC (Brazil) | 2.1 |
| 872 | Brechin City (Scotland) | 2.1 |
| 873 | HJK (FIN) | 2.1 |
| 874 | Glentoran (NIR) | 2.1 |
| 875 | Ankara Demirspor (Turkey) | 2.1 |
| 876 | Feirense (Portugal) | 2.1 |
| 877 | FK Qabala (Azerbaijan) | 2.1 |
More: the world top 200