| Catalina Worthing Ins Ltd (formerly Excess Ins) | 01903 836800 | DLM House, Downland Business Park, Lyons Way, Worthing, West Sussex, BN14 9RX, United Kingdom |
| Catlin Insurance Company (UK) Limited | 020 7458 5773 | 20 Gracechurch Street, London, EC3V 0BG, United Kingdom |
| Catlin Underwriting Agencies Limited | 020 7458 5773 | 20 Gracechurch Street, London, EC3V 0BG |
| Centrica Risk Limited | 00353 1 266 6000 | THIRD FLOOR, METROPOLITAN BUILDING, JAMES JOYCE STREET, DUBLIN, ZZ9 9ZZ, IRELAND |
| Charrington Insurance Sydicate 962 | | |
| Chaucer Insurance | 020 7105 8060 | Plantation Place, 30 Fenchurch Street, London, EC3M 3AD, United Kingdom |
| Chaucer Insurance Ireland DAC | | |
| Chester Street Insurance Holdings | 01274 715305 | c/o PwC Business Services Ltd, 5 Godwin Street, Bradford, BD1 2ST |
| China Taiping Insurance (UK) Ltd | 020 7839 1888 | The Communications Building, 48 Leicester Square, London, WC2H 7LT, United Kingdom |
| Chiyoda Fire & Marine Insurance Company of UK Ltd | | |
