| ATI Tank Hire Limited | Administrative & support | 1983 |
| Atlantis Property Holdings Ltd | Real estate | 2023 |
| Atlantis Tower Enterprise Ltd | Real estate | 2024 |
| Atuk Ltd | Manufacturing | 2016 |
| AU Horizons Limited | Health & social care | 2024 |
| Audioventures Limited | Administrative & support | 2025 |
| Audiovisions Advertising Ltd | Professional & scientific | 2025 |
| Aura Inns Limited | Real estate | 2015 |
| Aura Norfolk Ltd | Health & social care | 2025 |
| Auravation Essentials Ltd | Wholesale & retail | 2025 |
| Auto Attire Clothing Ltd | Wholesale & retail | 2024 |
| Autohire Supreme Motors Ltd | Administrative & support | 2015 |
| Automated Precision Manufacturing Ltd | Manufacturing | 2022 |
| Autotune Service & Repair Limited | Wholesale & retail | 2014 |
| Autumn Close Limited | Households | 2023 |
| Avamo Property Ltd | Construction | 2025 |
| Aventine Capital Partners Ltd. | Professional & scientific | 2016 |
| Averson Limited | Construction | 2013 |
| Aviators.Tv Ltd | Information & communication | 2022 |
| Avsk Private Ltd | Wholesale & retail | 2024 |
| Awakened Realm Ltd | Wholesale & retail | 2025 |
| AWE Assets Ltd | Hospitality | 2025 |
| Awesome Learning Ltd | Education | 2017 |
| Axil Group Ltd | Wholesale & retail | 2026 |
| Axlo Limited | Wholesale & retail | 2026 |
| Ayce-Acre Ltd | Construction | 2025 |
| Aylsham Consulting Ltd | Professional & scientific | 2024 |
| B and B Land Developments Limited | Construction | 2005 |
| B and B Land Holdings Limited | Financial services | 2013 |
| B and H Property Norfolk Limited | Real estate | 2024 |
| B G Brickwork Limited | Construction | 2017 |
| B G Frosdick Limited | Construction | 2017 |
| B J Goose Digger Hire Limited | Agriculture & fishing | 2017 |
| B&L Catering Ltd | Hospitality | 2011 |
| B.A.M. OIL Field Services Ltd | Construction | 2025 |
| B.C.D. Marine Limited | Construction | 1969 |
| B.Distributions Ltd | Wholesale & retail | 2026 |
| B.J. Communications Limited | Construction | 2001 |
| Babaluta Construct Transport Ltd | Construction | 2026 |
| Babb Mortgages Limited | Financial services | 2018 |
| Babylon Dent Limited | Health & social care | 2022 |
| Baccam Ltd | Real estate | 2016 |
| Back to Back (PVT) Limited | Hospitality | 2022 |
| Back to Brick Property Ltd | Real estate | 2020 |
| BAG Loop Limited | Administrative & support | 2025 |
| Bailey & Stone Limited | Manufacturing | 2015 |
| Bakehouse GY CIC | Arts & recreation | 2024 |
| Baker 8 Ltd | Hospitality | 2026 |
| Baker Heritage Holdings Limited | Financial services | 2026 |
| Bakes on ME Ltd | Manufacturing | 2026 |
| BAL Services Ltd | Wholesale & retail | 2016 |
| Balfour Aesthetics Ltd | Other services | 2025 |
| Bamax UK Limited | Manufacturing | 2015 |
| Bamboo Garden Chinese Cuisine Ltd. | Hospitality | 2026 |
| Bar 1 Gorleston Ltd | Extraterritorial | 2024 |
| Barber Morfose Ltd | Other services | 2020 |
| Barbers Housekeeping and Support Services Ltd | Administrative & support | 2024 |
| Barefaced Theatre Ltd | Arts & recreation | 2025 |
| Barford Heating Limited | Construction | 2002 |
| Bargain Beads Limited | Wholesale & retail | 2015 |
| BARGAINS4YOU Ltd | Wholesale & retail | 2025 |
| Barkers Photo FUN Ltd | Professional & scientific | 2023 |
| Barkym Haulage Ltd | Transport & logistics | 2026 |
| Barn 1 Events Ltd | Hospitality | 2025 |
| Baroque Enterprises Limited | Mining & quarrying | 1989 |
| Base Pharm Limited | Wholesale & retail | 2014 |
| Bastwick Tower Holidays Ltd | Hospitality | 2020 |
| Bath Realtor Limited | Construction | 2024 |
| Batterbee & SON Limited | Construction | 2022 |
| Batterbee Home Improvements Limited | Construction | 2022 |
| Battling Robots Limited | Education | 2020 |
| Bawan Retail Ltd | Wholesale & retail | 2026 |
| BB Geotech Services Limited | Other services | 2018 |
| BB Renewables Limited | Professional & scientific | 2025 |
| BDL30 Limited | Wholesale & retail | 2024 |
| BE Active Mobility Limited | Wholesale & retail | 2005 |
| BEA Placed Recruitment Ltd | Administrative & support | 2019 |
| Beach Car Parks Limited | Real estate | 2020 |
| Bearman Consulting Limited | Administrative & support | 2012 |
| Beats&Bites Ltd | Hospitality | 2025 |
| Beauty First Ltd | Other services | 2025 |
| Bebe-Rais Trading Ltd | Hospitality | 2025 |
| Beccles Carpet Centre Holdings Limited | Financial services | 2022 |
| Beccles Home & Flooring Ltd | Wholesale & retail | 2025 |
| Beck Consultancy Ltd | Mining & quarrying | 2011 |
| Beckett Holdings Limited | Financial services | 2017 |
| Becks Storage Ltd | Real estate | 2022 |
| Bedingfield Hire Base Limited | Real estate | 1988 |
| BEE Spoke Recruitment Ltd | Health & social care | 2021 |
| Beesafe Partnership Limited | Other services | 2025 |
| Beevor Farms Limited | Agriculture & fishing | 2007 |
| Belgrave Caviar Ltd | Hospitality | 2025 |
| Bell Inn ST Olaves Ltd | Hospitality | 2023 |
| Bellabodie Limited | Manufacturing | 2019 |
| Bellator Limited | Wholesale & retail | 2019 |
| Belles Hair and Beauty Limited | Other services | 2023 |
| Bellwood Practice Limited | Health & social care | 2015 |
| Belvidere Flat Management Company (Great Yarmouth) Limited | Real estate | 2010 |
| Bemaax Rentals Ltd | Administrative & support | 2013 |
| Bemeè Fashions Limited | Wholesale & retail | 2024 |