| Awpm Services Limited | Information & communication | 2007 |
| AWR Health Ltd | Administrative & support | 2021 |
| Awselfa Limited | Professional & scientific | 2024 |
| Axelium Limited | Information & communication | 2024 |
| Axelspire Ltd | Information & communication | 2026 |
| Axia Property Development Ltd | Construction | 2026 |
| Axian Consulting Ltd | Information & communication | 2020 |
| Axiom Guidance Limited | Information & communication | 2026 |
| Axiom Technologies Ltd | Manufacturing | 2025 |
| Axion Electronics Ltd | Wholesale & retail | 2026 |
| Axion Metal Limited | Manufacturing | 2025 |
| Axis Estates Limited | Construction | 1996 |
| Axivivo Limited | Information & communication | 2025 |
| Axnosis Ltd | Information & communication | 2015 |
| Axol Bioscience Ltd | Professional & scientific | 2012 |
| Axxello (PTY) Ltd | Professional & scientific | 2023 |
| Axxis Consulting Ltd | Professional & scientific | 2011 |
| Axzyra Limited | Wholesale & retail | 2015 |
| AY & Z Ltd | Education | 2026 |
| AY Market Ltd | Wholesale & retail | 2026 |
| AY5 Ltd | Hospitality | 2021 |
| AYA International Trading Co., Limited | Extraterritorial | 2021 |
| Ayah Investment Limited | Real estate | 2016 |
| Ayah Management Limited | Hospitality | 2012 |
| Ayeni Estates Ltd | Real estate | 2025 |
| Ayla International Trade Co., Ltd | Wholesale & retail | 2023 |
| AYM Infotech Ltd | Information & communication | 2025 |
| Ayo-Eve Ltd | Real estate | 2025 |
| Ayon Care Limited | Health & social care | 2024 |
| Ayouni Limited | Other services | 2025 |
| Ayoz Golden Scissors Ltd | Other services | 2026 |
| AYR Projects Limited | Construction | 2019 |
| Aysem Limited | Extraterritorial | 2025 |
| AZA Taxi Ltd | Transport & logistics | 2023 |
| AZENCO4 Limited | Administrative & support | 2016 |
| Azimi Global Co., Ltd | Wholesale & retail | 2023 |
| AZL Marine Ltd | Manufacturing | 2026 |
| Aztech Global Consultants Limited | Wholesale & retail | 2017 |
| Azuki Limited | Information & communication | 2012 |
| Azuma Cambridge Limited | Hospitality | 2024 |
| Azure UK Property Ltd | Real estate | 2026 |
| Azuri EF1K Ltd | Financial services | 2017 |
| Azuri JUA Limited | Financial services | 2018 |
| Azuri Luminosa Limited | Financial services | 2017 |
| Azuri Solaris Limited | Financial services | 2019 |
| Azuri SSPV1 Ltd | Manufacturing | 2017 |
| Azuri Taiyoko Limited | Wholesale & retail | 2018 |
| Azuri Technologies Ltd | Manufacturing | 2012 |
| Azxsolutions Ltd | Wholesale & retail | 2022 |
| Azylink Innovation Ltd | Professional & scientific | 2026 |
| B & B Hospitality Limited | Hospitality | 2025 |
| B & C Motors Limited | Wholesale & retail | 1997 |
| B & N Technical Services Ltd. | Professional & scientific | 2015 |
| B & R Easy Ltd | Other services | 2024 |
| B and J Developments Cambridge Limited | Construction | 2012 |
| B and P Developments Limited | Administrative & support | 2018 |
| B Driving Ltd | Education | 2022 |
| B Heating Service Ltd | Construction | 2019 |
| B on Time Ltd | Transport & logistics | 2025 |
| B Property Group Ltd | Construction | 2022 |
| B R Turner Carpet Service Limited | Wholesale & retail | 2019 |
| B R Unwin Construction Ltd | Construction | 2014 |
| B Rolph and Sons Limited | Construction | 2016 |
| B T P Haulage Limited | Transport & logistics | 2016 |
| B-Er Rezzak Ltd | Other services | 2025 |
| B. M. Kempton Limited | Wholesale & retail | 2005 |
| B. Sandoval Consulting Ltd | Professional & scientific | 2023 |
| B. Vincent Roofing Services Ltd | Real estate | 2006 |
| B.B.Boak Holdings Limited | Financial services | 2022 |
| B.C.S. Agriculture Limited | Agriculture & fishing | 1992 |
| B.R.M. Consultancy Limited | Financial services | 1993 |
| B10 Group Ltd | Financial services | 2025 |
| B2B Property & Development Ltd | Construction | 2020 |
| B3B Marketing Ltd | Professional & scientific | 2012 |
| Baaam Ltd | Professional & scientific | 2023 |
| Baan Thai Cambridge Limited | Hospitality | 2019 |
| Baanx.Com Ltd | Financial services | 2018 |
| Babaa Limited | Wholesale & retail | 2015 |
| Babcom Ltd | Information & communication | 2021 |
| Babiiss Ltd | Manufacturing | 2025 |
| Babouris Maintenance Services Ltd | Construction | 2024 |
| Babouris Properties Ltd. | Real estate | 2018 |
| Babouris Property Leasing Ltd | Real estate | 2025 |
| Babouris Property Management Ltd | Real estate | 2020 |
| Babouris Real Estate Ltd | Real estate | 2025 |
| Babraham & Pampisford Sporting Syndicate Ltd | Arts & recreation | 2025 |
| Babraham Institute Enterprise Limited | Professional & scientific | 2007 |
| Babraham Press Limited | Information & communication | 2024 |
| Babraham Research Campus Limited | Real estate | 1996 |
| Baby Lemonade Ltd | Wholesale & retail | 2023 |
| Baby Milk Action | Education | 1985 |
| Baby Plus International Ltd | Extraterritorial | 2012 |
| Babylon Translations Europe Limited | Professional & scientific | 2025 |
| Bacchanalia Winemerchants Limited | Wholesale & retail | 2007 |
| Back to Your Feet Limited | Other services | 2014 |
| Backstitch Ltd | Wholesale & retail | 2020 |
| Backwater Forge Ltd | Manufacturing | 2023 |
| Badea Solutions Ltd | Construction | 2021 |
| Badger Pass Limited | Information & communication | 2011 |
| Badomato Ltd | Manufacturing | 2024 |