| Arnold House Management Company Limited | Households | 1990 |
| Arnold Read Financial Associates Limited | Financial services | 2010 |
| Arrow Group Global Ltd | Wholesale & retail | 2015 |
| Arrow Holdings Ltd | Financial services | 2015 |
| Asaf Autos Ltd | Wholesale & retail | 2022 |
| Aserve Ltd | Extraterritorial | 2019 |
| Asett Homes Ltd | Real estate | 2014 |
| Ashfield Group Limited | Manufacturing | 2011 |
| Ashness Assured Limited | Construction | 1988 |
| Ashness Properties Limited | Real estate | 1996 |
| Ashwin Food Services Ltd | Wholesale & retail | 2019 |
| Aspect Home & Garden Limited | Construction | 2021 |
| ASR (East) Limited | Construction | 2026 |
| Asrig Services Limited | Construction | 2016 |
| Aston Housing Northern ( UK ) Limited | Construction | 2019 |
| Astute IT Contracting Limited | Information & communication | 2017 |
| Atlas Executive Travel COM Limited | Transport & logistics | 2022 |
| Atlas Private Hire Limited | Transport & logistics | 2002 |
| Atloran Limited | Professional & scientific | 2026 |
| ATP Group Ltd | Real estate | 2019 |
| Attlebridge Concrete Products Limited | Manufacturing | 2017 |
| Audrey Kawasaki Limited | Arts & recreation | 2023 |
| Autovision Advanced Vehicle Customisation and Towbars Limited | Wholesale & retail | 2017 |
| Avocet and Sanderlings Limited | Hospitality | 2022 |
| AW Building & Maintenance Limited | Construction | 2025 |
| Awaze Vacation Rentals Ltd | Hospitality | 1969 |
| Axillium Group Limited | Real estate | 2020 |
| Axillium Holdings Limited | Financial services | 2023 |
| Axle Network Ltd | Information & communication | 2026 |
| Ayana Caterers Ltd | Hospitality | 2022 |
| Azad Kebab House Ltd | Hospitality | 2026 |
| Azen Ltd | Wholesale & retail | 2025 |
| B & B Wright Holdings Limited | Real estate | 2020 |
| B & C Leisure Ltd | Arts & recreation | 2022 |
| B & H Property Renovations Ltd | Real estate | 2025 |
| B Armstrong Services Ltd | Construction | 2026 |
| B Burgess Roofing Limited | Construction | 2020 |
| B Constructive Limited | Real estate | 2005 |
| B D Renewable Heating Services Limited | Construction | 2017 |
| B F P (Eastern) Limited | Wholesale & retail | 2005 |
| B F Sparks Limited | Construction | 2011 |
| B G R Commercial Limited | Construction | 2016 |
| B Leuty Carpentry Ltd | Construction | 2018 |
| B Mayfield Limited | Construction | 2009 |
| B Vasanthan Limited | Wholesale & retail | 2015 |
| B Walker Management Co Limited | Other services | 2023 |
| B.R. Shreeve & Sons Limited | Transport & logistics | 1943 |
| Badger Building (E.Anglia) Limited | Construction | 1989 |
| Badgers Grove Estates Ltd | Real estate | 2026 |
| Bagshaw Builders Limited | Construction | 2003 |
| Baker Training Services Limited | Education | 2025 |
| Ballards Apothecary Ltd | Wholesale & retail | 2021 |
| Ballum Security Ltd | Financial services | 2021 |
| Ballum Technology Ltd | Manufacturing | 2020 |
| Bane Building Services Ltd | Construction | 2020 |
| Banner Court Properties(Lowestoft)Limited | Real estate | 1960 |
| BAR20 Suffolk Ltd | Hospitality | 2024 |
| Barge NO. 9 CIC | Other services | 2024 |
| Barkin Limited | Real estate | 2021 |
| Barn OWL Lodge Limited | Hospitality | 2006 |
| Barnard Sampson LLP | | 2009 |
| Barry Cutts Associates Limited | Professional & scientific | 2002 |
| Bartley Engineering Limited | Professional & scientific | 2020 |
| Base Camp Lowestoft Ltd | Education | 2019 |
| Bath Bonita Ltd | Wholesale & retail | 2020 |
| Bayfield Media Limited | Information & communication | 2003 |
| Baytree Surveying Limited | Professional & scientific | 2022 |
| BB Living Ltd | Real estate | 2026 |
| BC Electrical (EA) Limited | Construction | 2025 |
| BCR Electrical (EA) Ltd | Construction | 2026 |
| BE Dazzled Limited | Administrative & support | 2023 |
| Beach Farm Park Ltd | Real estate | 2011 |
| Beacon Oak Projects Limited | Professional & scientific | 2011 |
| Bear and Honey Badger Inns Ltd | Hospitality | 2023 |
| Bear Credit Limited | Financial services | 2023 |
| Bearphoto Ltd | Administrative & support | 2017 |
| Beatty Lockey Antiques Limited | Wholesale & retail | 2025 |
| BEC (East Anglia) Limited | Construction | 2018 |
| Beccles Amateur Sailing Club Limited | Arts & recreation | 2020 |
| Beccles Home Improvements Limited | Construction | 2008 |
| Beccles Plumbing & Heating Limited | Construction | 2012 |
| Beddows Technical Services Limited | Professional & scientific | 2020 |
| Bede Engineered Property Ltd | Professional & scientific | 2022 |
| BEE Branded Ltd | Information & communication | 2024 |
| Beech Road Wroxham Management Limited | Households | 2024 |
| Beeline Refrigeration Ltd. | Construction | 1999 |
| Beesa Care Limited | Wholesale & retail | 2013 |
| Bellestarre Limited | Hospitality | 2025 |
| Bellyboos Gorleston Limited | Wholesale & retail | 2018 |
| Beloud Limited | Information & communication | 2010 |
| Belvedere Car Sales Limited | Wholesale & retail | 2016 |
| Bemment Cooper (Accountants) Limited | Professional & scientific | 2000 |
| Beringer Properties Limited | Real estate | 2022 |
| Bern Engineering Ltd | Construction | 2024 |
| BES Services Anglia Limited | Professional & scientific | 2024 |
| Besada Engineering Services Limited | Professional & scientific | 2005 |
| Bespoke Electrical Installations Ltd | Construction | 2015 |
| Bespoke Informatics Ltd | Information & communication | 2025 |
| Bespoke.Ws Ltd | Information & communication | 2015 |
| Bewl Sailing Association Ltd | Arts & recreation | 2015 |