| Blacklands Court RTM Company Limited | Households | 2005 |
| Blandycreative Limited | Arts & recreation | 2019 |
| Blanke Slate Community Interest Company | Health & social care | 2007 |
| Blauw Bear Limited | Health & social care | 2007 |
| Blue Cloud Global U.K. Limited | Financial services | 2023 |
| Blue Line (Hastings) Ltd | Real estate | 2012 |
| Blue Rock Business Limited | Administrative & support | 2018 |
| Bluebell Pet Cemetery Limited | Other services | 2018 |
| Bluefish Sussex Limited | Real estate | 2015 |
| Bluehaven Group Ltd | Wholesale & retail | 2025 |
| Blueterra Ltd | Agriculture & fishing | 2025 |
| Board Game Museum Ltd | Arts & recreation | 2022 |
| Bohica Capital Limited | Professional & scientific | 2008 |
| Bolebrooke Road (Bexhill) Limited | Households | 2016 |
| Booh Restaurants Ltd | Hospitality | 2025 |
| Bookatrot Ltd | Administrative & support | 2018 |
| Booyah Vitality Trading Limited | Manufacturing | 2021 |
| Borough Homes Construction Limited | Construction | 2018 |
| Boscobel Management Limited | Hospitality | 1972 |
| Bowhill Management Company Limited | Households | 2018 |
| Bowles Hotel Group Ltd | Hospitality | 2023 |
| BPS Marketing Limited | Professional & scientific | 2006 |
| Bradmatt CG Limited | Financial services | 2010 |
| Bradshaw Road Construction Ltd | Construction | 2016 |
| Braeburn Care Ltd | Health & social care | 2024 |
| Brainfingle Content Consulting Limited | Information & communication | 2018 |
| Brandee Ltd | Information & communication | 2025 |
| Braybrooke Terrace RTM Company Ltd | Real estate | 2009 |
| Brewing Brothers Beachside Limited | Hospitality | 2022 |
| Brewing Brothers Brewery Ltd | Manufacturing | 2020 |
| Brewing Brothers Courtyard Limited | Hospitality | 2021 |
| Brewing Brothers Holdings Limited | Financial services | 2022 |
| Brewing Brothers Limited | Hospitality | 2016 |
| Brickz N Bitz Ltd | Wholesale & retail | 2021 |
| Bright Beginnings Daycare Limited | Health & social care | 2019 |
| Bright by Name Design Ltd | Professional & scientific | 2016 |
| Bright Mortgage Centre Limited | Administrative & support | 2010 |
| Bright Sparks Electrical Limited | Construction | 2017 |
| Brighter Spaces Cleaning Ltd | Administrative & support | 2025 |
| Brightly Solutions Ltd | Professional & scientific | 2022 |
| Brighton Thriller Film Ltd | Information & communication | 2017 |
| Brightred Resourcing Limited | Administrative & support | 2004 |
| Brindle Hill Limited | Real estate | 2014 |
| Bristol Real Properties Limited | Real estate | 2012 |
| Britannia Fishing Limited | Agriculture & fishing | 2015 |
| Broad Oak Building Solutions Ltd | Construction | 2019 |
| Brockhurst Capital Ltd | Financial services | 2024 |
| Brockhurst Property Ltd | Real estate | 2012 |
| Brockhurst Real Estate Limited | Construction | 2017 |
| Brockmoor Investments Ltd | Real estate | 2024 |
| Brooke Benington Ltd | Wholesale & retail | 2020 |
| Brownhill Tax Consultancy Ltd. | Professional & scientific | 2005 |
| Bryant Property Ltd | Real estate | 2025 |
| BSF Electronics Limited | Information & communication | 2014 |
| Bsnsrp Limited | Financial services | 2020 |
| Bspoke Building & Restoration Ltd | Construction | 2021 |
| Buckelsayers RTM Company Ltd | Households | 2018 |
| Bucklands Management Company Limited | Households | 2002 |
| Buckswood School Services Limited | Transport & logistics | 2007 |
| Budget Move Solutions Ltd | Transport & logistics | 2025 |
| Budget With Becky Limited | Wholesale & retail | 2023 |
| Bunka Restaurants Limited | Hospitality | 2025 |
| Burling Land Investments LLP | | 2015 |
| Business DEV Limited | Professional & scientific | 2011 |
| Business Email Marketing Ltd | Information & communication | 2026 |
| BUSINESS111.COM Limited | Information & communication | 2025 |
| Buster Cigars Ltd | Wholesale & retail | 2022 |
| Butter Street Ltd | Manufacturing | 2026 |
| Butters David Grey LLP | | 2008 |
| Buzz Sound Limited | Information & communication | 2016 |
| BW Cards Limited | Information & communication | 2003 |
| Bytestorm Ltd | Information & communication | 2025 |
| C & J Properties (ST Leonards) Limited | Real estate | 2025 |
| C B Electrical Contractors (S.E) Limited | Construction | 2002 |
| C Edwards Roofing Contractors Ltd | Construction | 2024 |
| C Salmons Builders Ltd | Construction | 2016 |
| C&C Electrical Contractors ( South East) Limited | Construction | 2022 |
| Cabaret Mechanical Theatre Learning CIC | Education | 2023 |
| Calima Kitchen Ltd | Hospitality | 2025 |
| Calverley Court RTM Company Limited | Households | 2018 |
| Cambridge Court Clinics Ltd | Health & social care | 2019 |
| Cambridge Garden Studios Hastings Limited | Real estate | 2022 |
| Cameras Turning Ltd | Administrative & support | 2023 |
| Campbell Plumbing Services Ltd | Construction | 2021 |
| Campbell Property Group Limited | Real estate | 2023 |
| Canavans @ Jenny Lind Limited | Hospitality | 2019 |
| Candido Harris Transport Logistics Ltd | Transport & logistics | 2022 |
| Canopy UK Property Investment Ltd | Real estate | 2022 |
| Canute Software Consultancy Limited | Professional & scientific | 2024 |
| Capers Productions Limited | Information & communication | 1995 |
| Capital Holdings (London) Limited | Real estate | 1995 |
| Capulus Trading Ltd | Wholesale & retail | 2024 |
| Caravan Bar Limited | Hospitality | 2018 |
| Carib DE L'Afrique Limited | Hospitality | 2019 |
| Carlden Limited | Construction | 2025 |
| Carlyle Campbell Estates Limited | Real estate | 1997 |
| Carola Van Dyke Art Limited | Arts & recreation | 2024 |
| Carola Van Dyke Ltd | Wholesale & retail | 2012 |
| Caroline Parent Ltd | Extraterritorial | 2025 |
| Cartenager Limited | Extraterritorial | 2006 |