| Boreham Management Company Limited | Households | 1998 |
| Borne KIN Rentals Ltd | Real estate | 2025 |
| Borne KIN Sourcing Ltd | Administrative & support | 2025 |
| Boss Hairdressing Ltd | Other services | 2026 |
| Boss Men’S Grooming Ltd | Other services | 2025 |
| Boston Scaffold Erections Ltd | Construction | 2025 |
| Botanica Agriculture and Extraction Ltd | Agriculture & fishing | 2017 |
| Boundless Electrical Ltd | Construction | 2023 |
| Boyakli 47 Ltd | Hospitality | 2024 |
| Bpvk Services Ltd | Information & communication | 2025 |
| Brainy Data Limited | Information & communication | 2003 |
| Braziers Lettings Ltd | Real estate | 2015 |
| Breedy Property Services Limited | Households | 2025 |
| Brilliant Bricks UK Limited | Education | 2020 |
| Britton Construction Limited | Professional & scientific | 2009 |
| Britton Developments Ltd | Construction | 2016 |
| Britton Engineering Services Limited | Construction | 1985 |
| Britton Ltd | Professional & scientific | 2015 |
| Britton Properties Ltd | Real estate | 2016 |
| Britton Vineyards Ltd | Agriculture & fishing | 2023 |
| Broadway Takeaway Ltd | Hospitality | 2017 |
| Bromley Brook Vineyard Ltd | Agriculture & fishing | 2020 |
| Bronchoe Creation CIC | Information & communication | 2025 |
| Brook Park (Clacton) Management Company Limited | Other services | 2002 |
| Brooklands (Weeley Heath) Management Company Limited | Households | 2017 |
| Brothers Liquor Store Ltd | Wholesale & retail | 2025 |
| Brushmark Decorating Ltd | Construction | 2025 |
| Bry&H.Co Limited | Wholesale & retail | 2016 |
| Bryant and Bull Homes Limited | Real estate | 2024 |
| Bsmh Group Ltd | Wholesale & retail | 2026 |
| Bsquare Asset Management Limited | Real estate | 2021 |
| Bsquare Assisting Hands Ltd | Real estate | 2019 |
| BTC Media Ltd | Construction | 2014 |
| Buildall Construction Ltd | Construction | 2024 |
| Buildall Homes and Gardens Ltd | Construction | 2023 |
| BUN N Run Orwell Bridge Limited | Hospitality | 2024 |
| Burfield Technical Services Limited | Information & communication | 2013 |
| Burge Holdings Ltd | Professional & scientific | 2021 |
| Business ET AL Limited | Administrative & support | 2022 |
| Butler GAS Ltd | Construction | 2026 |
| Butterfly Assets Ltd | Real estate | 2023 |
| Butterfly Flowers by Karina Ltd | Wholesale & retail | 2020 |
| Buxeyaestheticroom Ltd. | Professional & scientific | 2020 |
| Buyandselluk Ltd | Wholesale & retail | 2025 |
| BVR Construction Ltd | Construction | 2025 |
| BW ENG Ltd | Transport & logistics | 2018 |
| BWR Associates Limited | Information & communication | 2009 |
| Bzbeauty Ltd | Other services | 2026 |
| C Franklin Limited | Administrative & support | 2008 |
| C M Fenton Ltd | Wholesale & retail | 2023 |
| C&D Hauliers Ltd | Transport & logistics | 2025 |
| C&D Parcels Ltd | Transport & logistics | 2025 |
| C&G Property Acquisitions Limited | Real estate | 2024 |
| C. DOE & Co. (Clacton) Recycling Limited | Water & waste | 1968 |
| C.T. Gaze (Holdings) Limited | Construction | 1974 |
| C.W Retail Ltd | Wholesale & retail | 2026 |
| Cabletech Networks Limited | Real estate | 2006 |
| Cafee 128 Ltd | Hospitality | 2026 |
| Calibe Ltd | Real estate | 2021 |
| Calm Roots Care Limited | Health & social care | 2024 |
| Campwood Press Ltd | Manufacturing | 2013 |
| Canberra Carriage Company Ltd | Wholesale & retail | 2008 |
| Canbridge Limited | Professional & scientific | 1994 |
| Canbridge Management Ltd | Real estate | 1972 |
| Car Audio and Bits Limited | Wholesale & retail | 2026 |
| Cara Sweets Treats Gifts Ltd | Manufacturing | 2022 |
| Caravan Internet Ltd | Information & communication | 2024 |
| Care R US (Essex) Limited | Health & social care | 2014 |
| Care R US (London) Ltd | Health & social care | 2018 |
| Carn Management Services Limited | Professional & scientific | 2021 |
| Carnarvon Properties Limited | Real estate | 2004 |
| Carsons Property Services Limited | Construction | 2019 |
| Carter-Newlove Joinery Ltd | Construction | 2024 |
| Casera Limited | Arts & recreation | 2006 |
| Casey Construction Contractors Ltd | Construction | 2025 |
| Castle Tartan Limited | Real estate | 2006 |
| Cattell Consulting Ltd | Information & communication | 2023 |
| Cavendish Residential Care Homes Limited | Health & social care | 2003 |
| CB Auto Sales Limited | Wholesale & retail | 2015 |
| Cbitsoft Limited | Transport & logistics | 2002 |
| CDG Mortgages Limited | Professional & scientific | 2017 |
| Cedar Bridge Financial Advisory Ltd | Professional & scientific | 2025 |
| CEH Leisure Limited | Arts & recreation | 2022 |
| Celebrations Wedding & Party Hire Limited | Administrative & support | 2013 |
| Central Contracts EA Ltd | Real estate | 2023 |
| Certain Freedom Ltd | Health & social care | 2025 |
| Chandler Plumbing and Heating Ltd | Construction | 2016 |
| Chandos Court (Clacton) Ltd | Extraterritorial | 2023 |
| Chapel Street (Billericay) Phase II Management Company Limited | Households | 2002 |
| Chapter Twenty One Ltd | Administrative & support | 2020 |
| Charlton and Barrett Properties Limited | Construction | 2025 |
| Charz Couture Ltd | Other services | 2020 |
| Chase Nurseries Limited | Education | 2015 |
| Chasers Properties Specialists Ltd | Real estate | 2025 |
| Check My Tank Ltd | Extraterritorial | 2013 |
| Chelmer Valley Limited | Real estate | 1982 |
| Cherry Tree Tendring Limited | Real estate | 2014 |
| Chesterbury Lettings Ltd | Real estate | 2021 |
| Chevis MB Ltd | Health & social care | 2015 |
| Chic Furniture and Gifts Limited | Wholesale & retail | 2021 |