| Artisan Home Products Ltd | Wholesale & retail | 2019 |
| Arturas Driver Ltd | Transport & logistics | 2017 |
| Arythmos Limited | Information & communication | 2017 |
| AT Moore Holdings Ltd | Professional & scientific | 2011 |
| Ateroll Technology Limited | Energy | 2026 |
| Atlasfish Limited | Hospitality | 2025 |
| Auranto Ltd | Transport & logistics | 2025 |
| Aurora Bars and Restaurants Limited | Real estate | 2012 |
| Automotion Limited | Professional & scientific | 2023 |
| Automotive DNA Ltd | Transport & logistics | 2023 |
| Avalon Solutions Limited | Transport & logistics | 2021 |
| Awadis Ltd | Construction | 2021 |
| Axel Estate Property Management Limited | Real estate | 2025 |
| B & L Construction Limited | Construction | 2007 |
| B. & H. Shipping Limited | Other services | 1982 |
| B. Dean Developments Ltd | Real estate | 2026 |
| B. Dean Holdings Ltd | Real estate | 2023 |
| B3 Ventures Ltd | Arts & recreation | 2023 |
| Bacton Road Management Company Limited | Households | 2023 |
| Badminton Hub Ltd | Wholesale & retail | 2025 |
| Bake Shop and Delicatessen Limited | Hospitality | 2024 |
| Baltatrans Ltd | Transport & logistics | 2018 |
| Baltictrans Limited | Transport & logistics | 2019 |
| Barclaybrothersfelixstowe Ltd | Transport & logistics | 2023 |
| Baychev Company Ltd | Transport & logistics | 2018 |
| BB Franchises Felixstowe Limited | Hospitality | 2026 |
| BB Suffolk South Limited | Arts & recreation | 2025 |
| Beach Court Management (Felixstowe) Limited | Households | 1996 |
| Beach Place Management Limited | Households | 1997 |
| Beach Street Felixstowe Ltd | Hospitality | 2017 |
| Beachcote 2019 Ltd | Households | 2019 |
| Beanibazar Limited | Hospitality | 2014 |
| Beanibazar Property Ltd | Real estate | 2026 |
| Bearfootsoul Ltd | Information & communication | 2022 |
| Beauty at Tranquility Ltd | Other services | 2025 |
| Beauty by Edit Limited | Other services | 2023 |
| Beechwood Financial Management Ltd | Financial services | 2015 |
| Being Well in Suffolk C.I.C. | Health & social care | 2013 |
| Belinked Ltd | Information & communication | 2023 |
| Benjamin Taylor Watch Repair Specialist Ltd | Other services | 2019 |
| Benny’S Yard Ltd | Arts & recreation | 2021 |
| Bent Hill Catering Limited | Hospitality | 2017 |
| Bentley Media Solutions Limited | Professional & scientific | 2024 |
| Bertram Black's Ltd | Hospitality | 2025 |
| BESTOF5 Transport Limited | Transport & logistics | 2018 |
| Big Idea Photography Ltd | Arts & recreation | 2015 |
| Biker Trans Ltd | Transport & logistics | 2023 |
| BJC Installation Limited | Construction | 2020 |
| Black Horse 2020 Ltd | Transport & logistics | 2020 |
| Black Sea Freight Ltd | Transport & logistics | 2022 |
| Blake and Day Financial Planning Limited | Financial services | 2019 |
| Bloomfields Furnishers & Removers Ltd | Wholesale & retail | 2014 |
| Blue MAX Business Limited | Wholesale & retail | 2013 |
| Blue Sea Property Ltd | Real estate | 2023 |
| Bluestar Fulfilment Ltd | Administrative & support | 2023 |
| Blunt House Ltd | Professional & scientific | 2021 |
| Blush Skincare & Beauty Boutique Limited | Other services | 2019 |
| Boast International Limited | Transport & logistics | 1990 |
| Bojstrup-Morrison Ltd | Professional & scientific | 2026 |
| Bonsai Bloom Ltd | Wholesale & retail | 2025 |
| Boost Felixstowe Ltd | Other services | 2000 |
| Bootneck Properties Limited | Real estate | 2024 |
| Bopsocialmedia Limited | Manufacturing | 2024 |
| Borroughs Ltd. | Information & communication | 2001 |
| BOT Trans Ltd | Transport & logistics | 2021 |
| Bowling Green Court Limited | Households | 2001 |
| Boxtree Productions Ltd | Arts & recreation | 2017 |
| Bp.Pl.Transport Ltd | Transport & logistics | 2019 |
| Brand Fitness Limited | Administrative & support | 2017 |
| Bravant Properties Limited | Real estate | 2018 |
| Brave Mirror Productions Ltd | Arts & recreation | 2021 |
| Bridgegap Logistics Ltd | Transport & logistics | 2013 |
| Briskan Transport Ltd | Transport & logistics | 2021 |
| Britannia Bureau Ltd | Transport & logistics | 2009 |
| Broadwater Court (Felixstowe) Limited | Households | 2010 |
| Brook Lane Dentaire Ltd | Health & social care | 2026 |
| Broomhill Library Friends Ltd | Arts & recreation | 2012 |
| Brotherhood MR Ltd | Wholesale & retail | 2025 |
| BROTHERS123 Limited | Wholesale & retail | 2021 |
| BSJ Tranport Ltd | Transport & logistics | 2024 |
| Buckingham Springs Ltd | Wholesale & retail | 2026 |
| Bucovins Express Ltd | Transport & logistics | 2023 |
| Bull's Cliff Felixstowe Limited | Households | 1987 |
| Bunny & Hedgehog Ltd | Extraterritorial | 2023 |
| Burhill DCR Logistics Limited | Transport & logistics | 2018 |
| Burhill Logistics Holdings Limited | Financial services | 2019 |
| Burhill Logistics Limited | Transport & logistics | 2003 |
| Bury Flyer Limited | Professional & scientific | 2017 |
| Busdata Ltd | Information & communication | 2019 |
| Bushfire Photography Limited | Professional & scientific | 2010 |
| BX Currency Ltd | Financial services | 2022 |
| Bylly Ltd | Transport & logistics | 2020 |
| Byteworks Limited | Other services | 2018 |
| C a Massey Consulting Ltd | Professional & scientific | 2022 |
| C.H.D. (Forwarding) Limited | Transport & logistics | 1987 |
| C.W.H Scaffolding Services Ltd | Construction | 2024 |
| C3 Continuity Ltd | Professional & scientific | 2026 |
| Calibre Ecommerce Ltd | Wholesale & retail | 2025 |
| Calin Trans Ltd | Transport & logistics | 2021 |
| Candlers Yard Management Company Ltd | Households | 2019 |