| Blooming Marvellous Landscapes Ltd | Administrative & support | 2023 |
| Blossom Barn Nursery Ltd | Health & social care | 2021 |
| Blue BEE (G.B.) Ltd | Wholesale & retail | 2024 |
| Blue BEE (U.K.) Limited | Wholesale & retail | 2013 |
| Blue Bolt Electrical Services Ltd | Construction | 2017 |
| Blue Bridge Capital Limited | Professional & scientific | 2017 |
| Blue Chip Potatoes Limited | Wholesale & retail | 2021 |
| Blue Gates Barn Development Limited | Construction | 2020 |
| Blue Lagoon Wellness Ltd | Wholesale & retail | 2021 |
| Blue Room Arts Limited | Manufacturing | 2024 |
| Blue Screen Solutions Ltd | Other services | 2011 |
| Blue Skies Animal Physiotherapy Limited | Professional & scientific | 2023 |
| Bluebell Hill Engineering (Aylesford) Limited | Manufacturing | 1969 |
| Bluebirds Play Zone Ltd | Health & social care | 2025 |
| Bluegate Hall Farms Limited | Agriculture & fishing | 2000 |
| Bluemanor Trade Services Limited | Construction | 2014 |
| Bluemanor Windows Limited | Construction | 2008 |
| Blush Portrait Studios Ltd | Professional & scientific | 2026 |
| BMC Powdercoaters Limited | Construction | 2012 |
| BMM Flooring Ltd | Construction | 2022 |
| BNL Property Services Ltd | Real estate | 2025 |
| Bobbyteb Ltd | Information & communication | 2023 |
| Bocking Arts Theatre Trust. | Arts & recreation | 2011 |
| Bocking Place Limited | Other services | 2002 |
| Boilers in Essex Ltd | Construction | 2026 |
| Boleyn Farm Developments Limited | Construction | 2021 |
| Bolo Body Ltd | Wholesale & retail | 2025 |
| Bonanno Holdings Limited | Real estate | 2021 |
| Bond Security Services Limited | Administrative & support | 2017 |
| Bondent (UK) Limited | Manufacturing | 1987 |
| Boneless Ltd | Hospitality | 2026 |
| Bonita Aesthetics and Beauty Ltd | Manufacturing | 2023 |
| Book Trade Services Limited | Information & communication | 1989 |
| Booka Club Limited | Public administration | 2026 |
| Borg Locks UK Limited | Wholesale & retail | 1997 |
| Borough Olives Limited | Wholesale & retail | 2005 |
| Bottone Flooring Limited | Construction | 2005 |
| Bounce Bound Resin Surfaces Ltd | Construction | 2019 |
| Bounty Care Services Limited | Health & social care | 2022 |
| Bowergrange Estates Limited | Construction | 1988 |
| Bowergrange Group Holdings Limited | Financial services | 2009 |
| Bowergrange Polhawn Close Management Ltd | Real estate | 2017 |
| Bowman Bathrooms Ltd | Wholesale & retail | 2022 |
| Bowring & Associates Limited | Financial services | 2010 |
| Boydell & Sons Ltd | Real estate | 2019 |
| Boydell Developments Limited | Construction | 2019 |
| Boyton Hall Farms Limited | Agriculture & fishing | 1983 |
| Bqzeen Limited | Manufacturing | 2004 |
| BR Collective Ltd | Transport & logistics | 2025 |
| Bradling Security Limited | Administrative & support | 1995 |
| Brain Valley Analytics Ltd | Information & communication | 2020 |
| Brains Wellbeing CIC | Education | 2023 |
| Braintree Area Foodbank Ltd | Health & social care | 2012 |
| Braintree Barber Limited | Other services | 2020 |
| Braintree Builders Limited | Construction | 2000 |
| Braintree Butcher Ltd | Hospitality | 2026 |
| Braintree Courier Services Ltd | Transport & logistics | 2018 |
| Braintree District Museum Trust | Arts & recreation | 2005 |
| Braintree Dog Walking Ltd | Other services | 2023 |
| Braintree Engineering Company Limited | Manufacturing | 2004 |
| Braintree Fish and Chips Ltd | Hospitality | 2025 |
| Braintree Fish Bar Ltd | Hospitality | 2018 |
| Braintree Foods Limited | Hospitality | 2018 |
| Braintree Fried Chicken Ltd | Hospitality | 2025 |
| Braintree Gardeners & Landscapes Limited | Administrative & support | 2022 |
| Braintree Golf Club Limited | Arts & recreation | 1969 |
| Braintree Hockey Club Ltd | Arts & recreation | 2012 |
| Braintree Innovation & Research Advisory Group Limited | Professional & scientific | 2023 |
| Braintree Leasing Limited | Real estate | 2021 |
| Braintree Logistics Limited | Transport & logistics | 2017 |
| Braintree Office Village Management Limited | Construction | 2004 |
| Braintree Packaging Limited | Administrative & support | 2026 |
| Braintree Rugby Union Football Club Limited | Other services | 2009 |
| Braintree Scaffolding Ltd | Construction | 2023 |
| Braintree Spice Village Limited | Hospitality | 2023 |
| Braintree Suspended Ceilings Ltd | Construction | 2023 |
| Braintree Thai Ltd | Hospitality | 2024 |
| Braintree Town Football Club Limited | Arts & recreation | 1986 |
| Braintree Van Hire & Sales Ltd | Wholesale & retail | 2025 |
| Braintree Van Sales Limited | Wholesale & retail | 2013 |
| Braintree Village Chicken and Pizza Ltd | Hospitality | 2025 |
| Braintree Youth Project Charity | Other services | 2010 |
| Branchout Productions Limited | Information & communication | 2012 |
| Brand Builders & Developers Limited | Construction | 2009 |
| Branocs Estates Ltd | Real estate | 2014 |
| Breakthrough Psychological Services Limited | Health & social care | 2018 |
| Breakway Clothing Limited | Real estate | 1978 |
| Breathe Charging Limited | Extraterritorial | 2025 |
| Breathe Consultants Limited | Extraterritorial | 2017 |
| Breathe Partners Limited | Professional & scientific | 2023 |
| Brend Development Ltd | Wholesale & retail | 2015 |
| Brew 2 U Limited | Wholesale & retail | 2024 |
| BRG Steel Buildings Limited | Construction | 2023 |
| Briben Products Limited | Wholesale & retail | 1971 |
| Brick Heaven Ltd | Wholesale & retail | 2024 |
| Brickstone Property Group Ltd | Real estate | 2025 |
| Bridge Apartments Oulton Broad Ltd | Hospitality | 2021 |
| Bridge Electrical Contractors Limited | Construction | 1972 |
| Bridge Guard Security Limited | Administrative & support | 2020 |
| Bright and Fresh Cleaning Limited | Administrative & support | 2025 |