| ALL | Allstate |
| CB | Chubb |
| CNA | CNA Financial |
| GBLI | Global Indemnity Group |
| HMN | Horace Mann Educators |
| KMPR | Kemper |
| PGR | Progressive |
| PRA | ProAssurance |
| RLI | RLI |
| SIGI | Selective Insurance Group |
| STC | Stewart Information Services |
| TRV | Travelers Companies |
| WTM | White Mountains Insurance Group |