| Autodrain Limited | Wholesale & retail | 2003 |
| Autoformula Limited | Wholesale & retail | 2024 |
| Autokazz Limited | Wholesale & retail | 2023 |
| Autolt Limited | Other services | 2018 |
| Automated Doors & Gates Ltd | Manufacturing | 2006 |
| Automated Safety Ltd | Professional & scientific | 2022 |
| Autoshine Ipswich Ltd | Administrative & support | 2024 |
| Autotrad Limited | Professional & scientific | 2008 |
| Autoxpert Motors Ltd | Wholesale & retail | 2024 |
| Auvra Home Products Limited | Manufacturing | 2026 |
| AUX Ltd | Transport & logistics | 2023 |
| AV Recruitment Solution Ltd | Administrative & support | 2026 |
| Avalake Limited | Wholesale & retail | 2011 |
| Avanishan Food & Wine Ltd | Wholesale & retail | 2025 |
| Avant Atomic India Ltd | Information & communication | 2025 |
| Avantbuild Ltd | Construction | 2019 |
| Avanti Autos Limited | Wholesale & retail | 2009 |
| Avarna Capital Limited | Wholesale & retail | 2021 |
| Avatar Executive Consulting Limited | Professional & scientific | 2013 |
| Avatar Executive Properties Limited | Real estate | 2017 |
| Aveley Lodge Retirement Homes Limited | Health & social care | 2009 |
| Avenue CT (Property Management) Limited | Households | 2024 |
| Avenue Properties (Ipswich) Limited | Real estate | 1984 |
| Averquill Adaptics Limited | Manufacturing | 2026 |
| AVI Construction Ltd | Construction | 2019 |
| Avid Climbing Holdings Ltd | Arts & recreation | 2024 |
| Avid Climbing Limited | Arts & recreation | 2016 |
| Avior Financial Holdings Ltd | Financial services | 2024 |
| Avis Newsprint Limited | Wholesale & retail | 2003 |
| AVO Suffolk Limited | Wholesale & retail | 2013 |
| Avoca Park Holdings Limited | Financial services | 2019 |
| Avocet Property Ltd | Real estate | 2016 |
| Avoda Stein Limited | Construction | 2017 |
| Avoncrown Limited | Construction | 1977 |
| Avongrove Limited | Construction | 2014 |
| AVP Properties (Ipswich) Limited | Real estate | 2018 |
| AVS Technologies Limited | Professional & scientific | 2026 |
| Avva Holding Ltd | Financial services | 2020 |
| Avyro Commerce Ltd | Wholesale & retail | 2026 |
| Awaken 2 Life Limited | Other services | 2024 |
| Awesome Supplements Limited | Extraterritorial | 2016 |
| Awtj Limited | Professional & scientific | 2026 |
| AXE Edge Tech Ltd | Professional & scientific | 2026 |
| Axes and Arrows Ltd | Arts & recreation | 2021 |
| AXI Drywall Ltd | Construction | 2026 |
| Axiom Music Ltd | Arts & recreation | 2008 |
| Axiom Windows and Doors Ltd | Construction | 2019 |
| Axis Electrical D & R Limited | Construction | 2020 |
| Axis Electrical Ltd | Administrative & support | 2016 |
| Axis Enviro Ltd | Water & waste | 2025 |
| Axjet Limited | Administrative & support | 2001 |
| Axlab Limited | Professional & scientific | 2022 |
| AXM Transport Management Ltd | Transport & logistics | 2026 |
| Axter Limited | Construction | 1979 |
| AXY Homes Ltd | Real estate | 2024 |
| Ayan Construct Ltd | Construction | 2026 |
| AYC Services Ltd | Construction | 2023 |
| Aynurra Ltd | Manufacturing | 2026 |
| Ayran Limited | Hospitality | 2018 |
| AZ Bukhari Ltd | Administrative & support | 2025 |
| AZ Minerals Ltd | Wholesale & retail | 2026 |
| AZA Enterprises Ltd | Wholesale & retail | 2024 |
| Azexis Limited | Information & communication | 2007 |
| Azpects Limited | Wholesale & retail | 2009 |
| Azrak LLP | | 2011 |
| Aztech Plumbing & Heating Ltd | Construction | 2021 |
| Azusio Software Ltd | Information & communication | 2025 |
| B & C S Holdings Ltd | Real estate | 2018 |
| B & F Mechanical Services Limited | Other services | 1995 |
| B & H Care Ltd | Health & social care | 2020 |
| B & H Care Solutions Ltd | Health & social care | 2024 |
| B & H Property Managers Ltd | Real estate | 2021 |
| B & J Timber Frames Limited | Wholesale & retail | 2006 |
| B & L Equipment Limited | Transport & logistics | 1980 |
| B & L Products Limited | Manufacturing | 1974 |
| B & M Commercial Properties Ltd | Real estate | 2020 |
| B & M Developments Ltd | Administrative & support | 2018 |
| B & N Holdings (Suffolk) Ltd | Real estate | 2024 |
| B & R Bodyworks Limited | Wholesale & retail | 2008 |
| B & Z Property Holdings Limited | Real estate | 2025 |
| B Architecture Ltd | Professional & scientific | 2025 |
| B H Grain & Storage Ltd | Agriculture & fishing | 2025 |
| B Hive Electrical Ltd | Construction | 2025 |
| B I Splash Ltd | Administrative & support | 2024 |
| B K P Limousines Limited | Transport & logistics | 2009 |
| B Keeble Ltd | Construction | 2019 |
| B Logistics Ltd | Transport & logistics | 2023 |
| B P M a Limited | Extraterritorial | 2009 |
| B Sharpe Plumbing & Heating Limited | Construction | 2014 |
| B Square Property Management Limited | Real estate | 2025 |
| B W J Products Ltd | Wholesale & retail | 2025 |
| B&A Butchers Ltd | Wholesale & retail | 2021 |
| B&C Commercial Repairs Ltd | Manufacturing | 2025 |
| B&M Crick and Sons Limited | Agriculture & fishing | 2009 |
| B&Y Auto Parts Factory Ltd | Wholesale & retail | 2025 |
| B&Z Property Solutions Ltd | Real estate | 2023 |
| B-Max Trans Ltd | Transport & logistics | 2023 |
| B. a .H Fibre Optic Telecoms Services Ltd | Administrative & support | 2017 |
| B. Casey Builders Ltd. | Construction | 2002 |
| B. D. K. Industrial Products Limited | Manufacturing | 1959 |