| CB | Chubb |
| CNA | CNA Financial |
| DGICA | Donegal Group |
| GBLI | Global Indemnity Group |
| HMN | Horace Mann Educators |
| KMPR | Kemper |
| KNSL | Kinsale Capital Group |
| NODK | NI |
| PGR | Progressive |
| PRA | ProAssurance |
| RLI | RLI |
| SIGI | Selective Insurance Group |
| THG | Hanover Insurance Group |
| WRB | W. R. Berkley |