| 10 Ulwell Road, Swanage, Residents Company Limited | Hospitality | 1999 |
| 120 Avon Road Management Limited | Real estate | 2006 |
| 127.0.0.1 Ltd | Information & communication | 2020 |
| 14 West Allington Management Company Limited | Households | 2023 |
| 14 Wyke Road (Management) Company Limited | Households | 1993 |
| 16 Hamilton Road Management Limited | Professional & scientific | 2002 |
| 163B Ltd | Real estate | 2025 |
| 1864 Holdings Limited | Hospitality | 2014 |
| 1ST FIX (South) Limited | Wholesale & retail | 2007 |
| 20 Franklin Road Weymouth Management Company Limited | Households | 2003 |
| 24CR Secretarial Limited | Professional & scientific | 2007 |
| 25-27 Banks Road Limited | Households | 1994 |
| 27 Queens Road Ltd | Real estate | 2003 |
| 33 Melcombe Avenue (Weymouth) Limited | Households | 1984 |
| 360 IS US Limited | Professional & scientific | 2002 |
| 37 Brownlow Street Weymouth Limited | Households | 2000 |
| 3T Global Bidco PLC | Administrative & support | 2024 |
| 43/45 Lockyers Way Ltd | Real estate | 2026 |
| 54 Southbourne Road (Freehold) Limited | Extraterritorial | 2006 |
| 6 Verne Road Management Limited | Households | 1989 |
| 7 & 8 Pier Terrace Management Limited | Real estate | 1996 |
| 79 Wentworth Management Company Limited | Households | 1999 |
| 8TH Gear Limited | Transport & logistics | 2025 |
| A Hunter & Co Limited | Professional & scientific | 2004 |
| A P Osmond Thatching Limited | Construction | 2002 |
| A Smooth Move Limited | Transport & logistics | 1984 |
| A Touch of Caramel Ltd | Other services | 2023 |
| A. W. Cuff Ltd | Construction | 2002 |
| A.A.Broughton & SON Limited | Agriculture & fishing | 1960 |
| A.G. Down Limited | Other services | 1962 |
| A.H.Angell (Realisations) Limited | | 1959 |
| A.J Electrical (Poole) Limited | Construction | 2005 |
| A.J.V. Computing Ltd | Information & communication | 1999 |
| A.K Marine Services Ltd | Manufacturing | 2020 |
| A.M. Clements Limited | Construction | 2003 |
| A1 Building Services (UK) Limited | Construction | 2002 |
| AAA Building Services Ltd. | Administrative & support | 1976 |
| Aaron Manufacturing Limited | Manufacturing | 1999 |
| AB Design (Poole) Limited | Professional & scientific | 2005 |
| ABC (Auto Brotherwood Conversions) Limited | Extraterritorial | 2007 |
| Abdullah Prizes Limited | Wholesale & retail | 2025 |
| Ability Training (Southern) Limited | Education | 2007 |
| Absolute FUN Casino Ltd | Arts & recreation | 2006 |
| Accountax Solutions Limited | Professional & scientific | 2002 |
| Ace Home Rental Limited | Real estate | 2025 |
| Ace Welding Limited | Construction | 1999 |
| Acero Services Limited | Construction | 2007 |
| Acorn Luxury Care Limited | Health & social care | 1999 |
| Acorus Consulting Ltd | Construction | 2005 |
| Across the South Property Search Limited | Real estate | 2013 |
| Addiscombe Flat Management (Bournemouth) Limited | Households | 2001 |
| Addspace Construction Ltd. | Construction | 1989 |
| ADT Property Management Limited | Real estate | 2000 |
| Advance GAS Services Limited | Construction | 2007 |
| Advanced Mortgage Services Limited | Financial services | 2003 |
| AGE Concern Bournemouth | Health & social care | 2005 |
| Agincare Live-In Care (North) Limited | Health & social care | 2020 |
| AJM Networking Services Limited | Information & communication | 2006 |
| AKA Pure Limited | Households | 2020 |
| AKD Autoservices Limited | Wholesale & retail | 2007 |
| Alan Burge Limited | Administrative & support | 2004 |
| Alan Moxham Limited | Construction | 2008 |
| Albemarle Freehold Limited | Households | 1999 |
| Alexander DE Araújo Limited | Manufacturing | 2025 |
| ALL Done Construction Ltd | Construction | 2020 |
| ALL Systems International Limited | Information & communication | 1987 |
| Allington Building Services Limited | Construction | 2004 |
| Allum and Sidaway Limited | Wholesale & retail | 2003 |
| Alpha Alpacas Limited | Agriculture & fishing | 2001 |
| Alpine Bodyshop Services Limited | Manufacturing | 1992 |
| Alpine Energy Ltd | Manufacturing | 2005 |
| Althea Marine Consulting Ltd | Transport & logistics | 2025 |
| Altogether Care - Care Homes Limited | Professional & scientific | 1996 |
| Altogether Care LLP | | 2004 |
| Alumhurst Freehold Ltd | Households | 2001 |
| Ambrow Trailer Services Limited | Manufacturing | 2003 |
| Americurium Ltd | Wholesale & retail | 2008 |
| AML Carpentry Ltd | Construction | 2007 |
| Ancom UK Limited | Information & communication | 2001 |
| Andrews and Palmer Limited | Professional & scientific | 1991 |
| Andy Barrington Ltd | Information & communication | 2005 |
| Andy Whitty Limited | Construction | 2000 |
| Angel, Roberts & Angel Limited | Wholesale & retail | 2005 |
| Anglo-Continental Educational Group (G.B.) Limited | Education | 1954 |
| Antiquates Limited | Wholesale & retail | 2007 |
| APE Concessions Limited | Wholesale & retail | 2000 |
| Apex Line Services Ltd | Arts & recreation | 2024 |
| Apexstar Aviation Ltd | Education | 2019 |
| Apharm Limited | Wholesale & retail | 1999 |
| Apms Productions Limited | Information & communication | 1993 |
| Appledore Shipbuilders Limited | Energy | 1922 |
| April 2000 Management Comp. Limited | Professional & scientific | 2000 |
| Aqua Commercial Partnership LLP | | 2006 |
| Aqua Crown Partnership LLP | | 2007 |
| Aqua Peverell LLP | | 2008 |
| Aqua Trinity NO.12 Partnership LLP | | 2007 |
| Aqua Trinity Partnership LLP | | 2006 |
| Ararat Designs Limited | Professional & scientific | 2001 |
| Ardico Limited | Professional & scientific | 1990 |
| Ardmair Flat Management Company Limited | Households | 1988 |