| 07737281 Limited | Professional & scientific | 2011 |
| 10000 Millionaires Ltd | Administrative & support | 2016 |
| 106 Stour Road Freehold Limited | Households | 2014 |
| 1214-1216 Christchurch Road Management Limited | Households | 1986 |
| 1217 Group Limited | Professional & scientific | 2023 |
| 14 Hamilton Road Management Company Limited | Households | 2025 |
| 16 Castle Street RTM Company Limited | Real estate | 2025 |
| 1890 Eighteen Ninety Ltd | Construction | 2021 |
| 18A Browning Avenue RTM Company Limited | Households | 2025 |
| 1977 Group Ltd | Real estate | 2025 |
| 1FITLIFE Ltd | Information & communication | 2018 |
| 1ST Connection Electrical Services Ltd | Energy | 2014 |
| 22 Avon Road West Management Limited | Households | 2018 |
| 24 Devco Ltd | Construction | 2024 |
| 24 Knole Road Freehold Limited | Households | 2005 |
| 24 Seabourne Road RTM Company Limited | Households | 2022 |
| 24 Seven Food Service Limited | Wholesale & retail | 2018 |
| 24-26 Studland Road Management Company Limited | Real estate | 2021 |
| 28 Years Limited | Real estate | 2021 |
| 29 Years Limited | Financial services | 2021 |
| 2B Media Publishing Ltd | Information & communication | 2014 |
| 2B4YOU Ltd | Wholesale & retail | 2021 |
| 34 Crabton Close Road Management Limited | Households | 1993 |
| 3BRIDGE Consultancy Ltd | Professional & scientific | 2008 |
| 3FEET Limited | Health & social care | 2020 |
| 3T Connect Limited | Administrative & support | 2024 |
| 3T Training Services Limited | Other services | 2006 |
| 4 Living Limited | Real estate | 2019 |
| 41 Burleigh Road Ltd | Households | 2023 |
| 42 Beaufort Ltd | Real estate | 2025 |
| 4U2EMPOWER Ltd | Health & social care | 2022 |
| 5 Point Group Limited | Construction | 2023 |
| 50 Bridge Street Ltd | Real estate | 2010 |
| 51 South Road Management Company Limited | Real estate | 2003 |
| 53 Klea Avenue Limited | Households | 1991 |
| 6 Week Challenge Ltd | Professional & scientific | 2019 |
| 7 ELM Group Ltd | Construction | 2019 |
| 7 Perry Vale RTM Company Limited | Households | 2025 |
| 7-15 Stonecroft Limited | Professional & scientific | 2001 |
| 71 Construction Limited | Construction | 2014 |
| 7AM Holdings Limited | Professional & scientific | 2010 |
| 9 Digits Limited | Wholesale & retail | 2021 |
| 9 Limits Ltd. | Information & communication | 2016 |
| A & R Hague Holdings Ltd | Construction | 2023 |
| A & S Design & Build Limited | Extraterritorial | 2006 |
| A R Plant Hire Limited | Administrative & support | 2004 |
| A S B Services Limited | Construction | 2000 |
| A&G Hand Car Wash & Valeting Ltd | Administrative & support | 2026 |
| A&K Griffiths Ltd | Professional & scientific | 2016 |
| A&K Morris Ventures UK Ltd | Professional & scientific | 2026 |
| A. Tarr Limited | Real estate | 1958 |
| A.A. Jupe Developments Limited | Construction | 1987 |
| A.D.D. Filtration Ltd | Manufacturing | 2010 |
| A.J. Smith Carpentry & Building Contractors Limited | Construction | 2002 |
| A2B Transport Limited | Transport & logistics | 2000 |
| AA Decor Ltd | Construction | 2015 |
| AA Electrics Limited | Construction | 2015 |
| AA Fibreglassing Ltd | Manufacturing | 2017 |
| AAA Marine Services Ltd | Manufacturing | 2018 |
| Ab&Ab Logistics Ltd | Transport & logistics | 2023 |
| Abacus Financial (Mudeford) Limited | Financial services | 2004 |
| Abbots Brook Management Company Limited | Households | 2007 |
| Abbots Finance Limited | Administrative & support | 2002 |
| Abbott Limited | Real estate | 1981 |
| ABC 123 Ltd | Professional & scientific | 1997 |
| Abettor Consulting Limited | Professional & scientific | 2016 |
| ABM Steel UK Ltd | Construction | 2009 |
| Acacia Court Freehold Limited | Households | 2006 |
| Accessibility Easy Ltd | Education | 2022 |
| Accessibility Made Easy Ltd | Education | 2022 |
| Ace Aerials Limited | Information & communication | 2012 |
| Ace Diets Limited | Extraterritorial | 2011 |
| Acorn Group 2020 Ltd | Hospitality | 2020 |
| Acorn Quality Solutions Limited | Administrative & support | 2001 |
| Acquisition Advisory Limited | Administrative & support | 2025 |
| Acrr Ltd | Real estate | 2025 |
| Activate Ondemand (AOD) Limited | Information & communication | 2019 |
| Active Sensors Limited | Manufacturing | 1993 |
| AD & GP Property Ltd | Real estate | 2025 |
| Ad-Me Ltd | Information & communication | 2019 |
| Adrian Hare Consultants Limited | Professional & scientific | 2017 |
| Adrian Smith Carpentry Limited | Manufacturing | 2020 |
| Adrox Ltd | Wholesale & retail | 2025 |
| Adsit Limited | Information & communication | 2008 |
| Advanced Angling Ltd | Arts & recreation | 2012 |
| Advanced Auto Repairs Limited | Wholesale & retail | 2003 |
| Advanced Embedded Solutions Ltd | Wholesale & retail | 1999 |
| Advanced Industrial Solutions Limited | Administrative & support | 2023 |
| Advanced Laboratory Technologies Europe Ltd | Wholesale & retail | 2005 |
| Aedos Limited | Financial services | 2009 |
| AEJ Consulting Limited | Information & communication | 2009 |
| Aeon Finance Technology Limited | Administrative & support | 2011 |
| Aeon Properties and Lettings Limited | Real estate | 2022 |
| Aeon Ventures Limited | Administrative & support | 2003 |
| AF Refurbishments Ltd | Construction | 2022 |
| African Sky Foods Limited | Professional & scientific | 2015 |
| Agile Ears Ltd | Professional & scientific | 2025 |
| AIM Aviation Limited | Professional & scientific | 2010 |
| AIM Composites Limited | Manufacturing | 1939 |
| Air Duct Solutions Ltd | Energy | 2014 |