| Autiboi Apparel Limited | Other services | 2023 |
| Automatic Gate Company Limited | Construction | 2022 |
| Avenue 9 Solutions Limited | Information & communication | 2019 |
| Avery's Garage and Transport Services Limited | Wholesale & retail | 1962 |
| Avila Yoga & Meditations Ltd | Other services | 2025 |
| Avitus Holding Limited | Financial services | 2020 |
| Awaken Chiropractic Ltd | Health & social care | 2012 |
| Axios Education Limited | Other services | 2023 |
| Axis 43 Management Company Limited | Real estate | 2011 |
| Ayus Clinic Ltd | Arts & recreation | 2023 |
| Ayus Media Ltd | Professional & scientific | 2026 |
| Ayus Wellness Ltd | Health & social care | 2022 |
| Azure Bespoke Structures Ltd | Administrative & support | 2019 |
| B Hair Limited | Other services | 2023 |
| B. Lawrence Carpentry Limited | Construction | 2014 |
| BA Technical Services Ltd | Construction | 2017 |
| Babyblack Limited | Manufacturing | 2017 |
| Bacak 27 Ltd | Hospitality | 2024 |
| Back to Balance Chiropractic Limited | Health & social care | 2015 |
| Backstage Financial Limited | Financial services | 2025 |
| BAD World Ltd | Manufacturing | 2023 |
| Bailey & Clark Ltd | Education | 2023 |
| Baillie Sales Support Limited | Professional & scientific | 2009 |
| Bakara Spice Limited | Hospitality | 2019 |
| Ball Enterprises Limited | Wholesale & retail | 2015 |
| Bandal Limited | Other services | 2003 |
| Barkberry Yard Dog Groomers and Academy Ltd | Other services | 2025 |
| Barker's Bookkeeping Ltd | Professional & scientific | 2014 |
| Barrett Oakmont Limited | Real estate | 2025 |
| Barwood Capital (CPF2017) Limited | Financial services | 2017 |
| Barwood Capital (RIPDM1) Limited | Financial services | 2018 |
| Barwood Capital (RIPDM2) Limited | Financial services | 2018 |
| Barwood Capital Holdings Limited | Financial services | 2012 |
| Barwood Capital Limited | Financial services | 2009 |
| Barwood General Partner 2017 (Nominee) Limited | Financial services | 2017 |
| Barwood General Partner Growth Fund (IV) Limited | Financial services | 2019 |
| Barwood General Partner Growth Fund (V) Limited | Financial services | 2022 |
| Barwood Holdings Limited | Financial services | 2023 |
| Barwood Investment Platform LLP | | 2024 |
| Barwood Investor 2017 LLP | | 2017 |
| Barwood Investor 2019 LLP | | 2019 |
| Barwood Investor 2022 LLP | | 2022 |
| Barwood Property 2015 Limited Partnership | | 2015 |
| Barwood Property 2017 Coinvest 1 Limited Partnership | | 2017 |
| Barwood Regional Property Growth Fund IV LP | | 2019 |
| Barwood Regional Property Growth Fund V LP | | 2022 |
| Base Level Limited | Other services | 2021 |
| Basic Edge Ltd | Wholesale & retail | 2020 |
| Bates Body Factory Ltd | Arts & recreation | 2018 |
| Bates Body Foods Ltd | Manufacturing | 2018 |
| Battlebury Consulting Ltd | Administrative & support | 2019 |
| Baxter Boat Yard Ltd | Manufacturing | 2015 |
| BB Future Investments Ltd | Real estate | 2025 |
| BBI Services Limited | Professional & scientific | 2014 |
| Bccim GP Limited | Financial services | 2021 |
| Bccim Investor LLP | | 2021 |
| Bccim LLP | | 2020 |
| Bccim Nominee 1 Limited | Construction | 2021 |
| Bccim Nominee 2 Limited | Construction | 2021 |
| Bccim UK Regional Industrial LP | | 2017 |
| Bccim Ukri General Partner Limited | Financial services | 2017 |
| BCL (Maple Cross) LLP | | 2018 |
| BCL Bracknell Limited | Construction | 2021 |
| Bcnc Hamilton Limited | Households | 2019 |
| BCW Consulting Limited | Information & communication | 2017 |
| BDK Electrical Inspection & Testing Limited | Construction | 2024 |
| BDL (London) Limited | Professional & scientific | 2005 |
| Beanwave Ltd | Professional & scientific | 2009 |
| Bear's Motors Repairs Ltd | Wholesale & retail | 2024 |
| Beat Gardens Ltd | Construction | 2025 |
| Beattie Family Investments Limited | Real estate | 2020 |
| Beau Blue Modelling Agency Ltd | Other services | 2024 |
| Beazleys GAS Heating & Plumbing Limited | Construction | 2012 |
| BEC Consultants Ltd | Professional & scientific | 2012 |
| BEC Utility Consultants Ltd | Professional & scientific | 2019 |
| Becherer UK Limited | Wholesale & retail | 2012 |
| BECRE8IVE Limited | Wholesale & retail | 2019 |
| Becs Rainey Ltd | Information & communication | 2022 |
| Bedfordtk Limited | Hospitality | 2025 |
| Bedrock Ventures Ltd. | Financial services | 2021 |
| BEE Bakes Ltd | Manufacturing | 2025 |
| Beechplace Limited | Professional & scientific | 1979 |
| Behavioural Intelligence Ltd | Information & communication | 2020 |
| Belgeonne European Management Ltd | Extraterritorial | 2011 |
| Bell Lowry Design Limited | Other services | 2022 |
| Bell Plantation (Garden Centre) Limited | Wholesale & retail | 2005 |
| Bell Plantation Holdings Limited | Financial services | 2021 |
| Belle Baulk Associates Limited | Professional & scientific | 2010 |
| Bells & Ribbons Ltd | Administrative & support | 2017 |
| Beneath the Surface Therapy Ltd | Health & social care | 2026 |
| Bengal Consulting Limited | Information & communication | 2020 |
| Bengal Housing Limited | Real estate | 2017 |
| Bengal Village Whittlebury Limited | Hospitality | 2024 |
| Benington Limited | Administrative & support | 1998 |
| Benman Limited | Professional & scientific | 1998 |
| Bentley DPM Ltd | Manufacturing | 2021 |
| Bentley Driving and Racing Ltd | Arts & recreation | 2012 |
| Bentley Seats and Racing Limited | Arts & recreation | 2018 |
| Berna Ltd | Professional & scientific | 2023 |
| Berry Cranes Holdings Ltd | Financial services | 2024 |