| 'Bodymattersmotion' Physiotherapy Ltd | Health & social care | 2024 |
| 1 Eldon Place Management Company Limited | Real estate | 1989 |
| 1-4 Pymore Island Bridport Management Limited | Real estate | 2009 |
| 175 Global Ltd | Other services | 2023 |
| 1ST Commercial Cleaning Limited | Administrative & support | 2016 |
| 21 ST Catherines Road Management Ltd | Real estate | 2026 |
| 249 Kinson Road (Management) Limited | Households | 1998 |
| 2ND Gear Limited | Wholesale & retail | 2011 |
| 2T Solutions Limited | Professional & scientific | 2012 |
| 3 GEN Holdings Ltd | Financial services | 2019 |
| 33 Windsor Road Property Management Ltd | Households | 2014 |
| 354 Ferndown Ltd | Hospitality | 2019 |
| 360 Aviation Limited | Professional & scientific | 2014 |
| 4 Corners Fest Limited | Hospitality | 2022 |
| 4 Highmoor Road Management Company Limited | Households | 2026 |
| 442 New Road Limited | Households | 1980 |
| 5 Windsor Road Property Management Limited | Households | 2015 |
| 6-10 Omaha Drive RTM Company Ltd | Other services | 2015 |
| 777 Hotels Limited | Hospitality | 2012 |
| 777 Property Investments Limited | Construction | 2020 |
| 8 Forest Hills (RWM) Limited | Construction | 2016 |
| A & R Property Maintenance (Dorset) Ltd | Administrative & support | 2022 |
| A a Chefani Limited | Health & social care | 2018 |
| A G Diagnostics Limited | Wholesale & retail | 2021 |
| A J Building & Plumbing Services Limited | Construction | 2018 |
| A M Architectural Consultancy Ltd | Professional & scientific | 2014 |
| A One Acquisitions Ltd | Financial services | 2015 |
| A One Holdings Limited | Financial services | 2002 |
| A One Insurance Services (Blandford) LLP | | 2002 |
| A One Insurance Services (Bmth) Limited | Administrative & support | 1997 |
| A One London Risk Services Ltd | Financial services | 2019 |
| A One Southampton Risk Services Ltd | Financial services | 2020 |
| A Pro Clean Limited | Administrative & support | 2014 |
| A&R Nailartistry Ltd | Wholesale & retail | 2024 |
| A.J. Beal Hair Design Limited | Other services | 2005 |
| A11 Security Limited | Administrative & support | 2019 |
| A2V Trade Limited | Professional & scientific | 2012 |
| AB Commercial Management Ltd | Professional & scientific | 2017 |
| Abacus Financial Options Limited | Financial services | 2011 |
| ABG Solutions Limited | Wholesale & retail | 2025 |
| Abingdon Risk Consulting Limited | Financial services | 2011 |
| Access Potential Ltd | Health & social care | 2004 |
| Accounts Limited | Professional & scientific | 1983 |
| Ace Media Limited | Information & communication | 2014 |
| Achieve Personal Coaching Ltd | Health & social care | 2019 |
| Acorn Spencer Limited | Professional & scientific | 2007 |
| ACS Networks Limited | Construction | 2009 |
| Actipath Limited | Information & communication | 2017 |
| Active Claims Solutions Ltd | Administrative & support | 2015 |
| Acumen Financial Management Limited | Professional & scientific | 2020 |
| ADE Support Service Ltd | Health & social care | 2019 |
| Advanced Fire Detection Ltd | Construction | 2026 |
| Advanced Fire Ltd | Administrative & support | 2017 |
| Advanced Stone & Masonry Supplies Ltd | Construction | 2018 |
| AEC South Ltd | Construction | 2025 |
| AED5 Ltd | Administrative & support | 2023 |
| Agora Homes Ltd | Construction | 2007 |
| AGT Notary Public Limited | Professional & scientific | 2024 |
| Ahmed Food Stores Limited | Wholesale & retail | 2011 |
| Ahmed Properties (Bournemouth) Limited | Real estate | 2002 |
| AI Comms Ltd | Information & communication | 2006 |
| Aict Ltd | Information & communication | 2018 |
| Aimee Carmichael Limited | Professional & scientific | 2012 |
| Air Bearings Limited | Manufacturing | 1993 |
| Airbox Ventilation Ltd | Construction | 2018 |
| Airoducts Limited | Construction | 2013 |
| AJC Vehicle Sales Ltd | Wholesale & retail | 2024 |
| Ajlm Properties Ltd | Construction | 2019 |
| AKP Consultancy Services Ltd | Information & communication | 2024 |
| Albea Trading Limited | Wholesale & retail | 2022 |
| Aldworth Drake Consulting Limited | Information & communication | 2020 |
| Alfie Consultancy Limited | Professional & scientific | 2025 |
| Alice Investments Limited | Real estate | 2008 |
| ALL Embracing Limited | Education | 2016 |
| ALL Seasons Roof Ltd | Extraterritorial | 2017 |
| ALL Year Round Ltd | Information & communication | 2026 |
| ALL Your Marketing Services Limited | Professional & scientific | 2014 |
| Alliance Network Infrastructures Limited | Construction | 2001 |
| Allied Universal Consulting Limited | Professional & scientific | 2015 |
| Altwood Fire and Security Ltd | Construction | 2016 |
| AM Techworks Limited | Information & communication | 2024 |
| Amanda Murrell Associates Ltd | Professional & scientific | 2008 |
| Amcs Poole Limited | Administrative & support | 2021 |
| Amelate Limited | Real estate | 1978 |
| Amelio Tech Ltd | Information & communication | 2023 |
| Amey Executive Travel Ltd | Transport & logistics | 2024 |
| Amilake Southern Limited | Wholesale & retail | 1994 |
| Ample SIM Studios Ltd | Other services | 2026 |
| Andrew James Motorhomes Holdings Limited | Financial services | 2023 |
| Andrew James Motorhomes Ltd | Wholesale & retail | 2021 |
| Andrew James Motorhomes Service Centre Limited | Wholesale & retail | 2023 |
| Andrew Johnson GP Locum Ltd | Health & social care | 2019 |
| Angel Taxi's (Ilminster) Limited | Transport & logistics | 2019 |
| Angelo Tsiapkinis Hairdressing Limited | Other services | 2006 |
| Angle TM Limited | Professional & scientific | 2004 |
| Angus Enterprises Limited | Wholesale & retail | 2022 |
| Anjensar Properties Limited | Real estate | 2019 |
| Ankers and Rawlings Developments Limited | Construction | 1975 |
| Ankers Investments (Poole) Limited | Construction | 1984 |
| Annalytics Limited | Information & communication | 2006 |