| Antares Managing Agency Ltd | 020 7959 1900 | 21 Lime Street, London, EC3M 7HB |
| Arbor Property & Casualty Ireland Limited | 00353 1 605 3048 | 25 - 28 Adelaide Road, Dublin 2, Dublin, ZZ9 9ZZ, Ireland |
| Arch Insurance (UK) Limited | 020 7621 4500 | 6th Floor, Plantation Place South, 60 Great Tower Street, London, EC3R 5AZ, United Kingdom |
| Argenta Syndicate Management Ltd | 020 7825 7200 | 70 Gracechurch St, London, EC3V 0XL |
| Argo Managing Agency Limited | 0207 712 7600 | Exchequer Court, 33 St. Mary Axe, London, EC3A 8AA |
| ArgoGlobal SE | 0207 712 7558 | ArgoGlobal SE, Aragon House, Dragonara Road, St Julian's, STJ 3140, Malta, ZZ9 9ZZ |
| Arriva Insurance Company (Gibraltar) Limited | 00350 200 43882 | Suite 913, 1st Floor, Europort, Gibraltar, GX11 1AA |
| Ascot Underwriting Ltd | 0207 743 9600 | 20 Fenchurch Street, London, EC3M 3BY |
| Ashdowns Limited | 01695 50000 | European Technical Centre,, Hall Lane, Lathom, Near Ormskirk, Lancashire, L40 5UF |
| Aspen Insurance UK Limited | 020 7184 8000 | Kyle Patel, UK Property & Casualty Claims, 30 Fenchurch Street, London, EC3M 3BD |
