| Be.Kntc Ltd | Health & social care | 2023 |
| Beamlab Trading Ltd | Wholesale & retail | 2026 |
| Bear SMB Ltd | Real estate | 2021 |
| Bears Bakery Ltd | Wholesale & retail | 2021 |
| Beaton Trading Ltd | Financial services | 2025 |
| Beauty by Fran Limited | Other services | 2021 |
| Beckwith Accountants Limited | Other services | 2015 |
| Beehome Financial Services Limited | Financial services | 2025 |
| Belle's Bakers Ltd | Wholesale & retail | 2022 |
| Bemighty Limited | Other services | 2018 |
| Benfleet Coatings Ltd | Construction | 2024 |
| Benieto Limited | Transport & logistics | 2022 |
| Bentley Thornebridge Limited | Construction | 2017 |
| Bespoke Sourcing Limited | Real estate | 2020 |
| Betchley Consulting Limited | Professional & scientific | 2011 |
| Betts Farm (Hockley) Management Company Limited | Real estate | 1982 |
| Bezel Eight Limited | Manufacturing | 2023 |
| Bhatti Cuts Limited | Other services | 2021 |
| Bibbys Property Investment Limited | Real estate | 2021 |
| Big John Group Ltd | Construction | 2023 |
| Bigfoot Group Limited | Information & communication | 2025 |
| Bill Busters Limited | Information & communication | 1999 |
| Birchwood Education Ltd | Education | 2024 |
| Birmingham Goldmasters Limited | Wholesale & retail | 2001 |
| Biswas Ophthalmics Limited | Health & social care | 2014 |
| Bliss & Bubbles Ltd | Wholesale & retail | 2025 |
| Blooming Rooms Limited | Wholesale & retail | 2024 |
| Blue Bar Productions Ltd | Arts & recreation | 2022 |
| Blue Rooms & Co Ltd | Real estate | 2019 |
| Blue Willow Properties Ltd | Real estate | 2026 |
| Blueco Agency Ltd | Information & communication | 2024 |
| Bluesyke Limited | Professional & scientific | 2006 |
| Bobby the Builder Limited | Construction | 2015 |
| Boleyn Events C.I.C. | Hospitality | 2021 |
| Bondodell Ltd | Construction | 2019 |
| Bone and Bees Ltd | Wholesale & retail | 2025 |
| Borkett Industries Limited | Financial services | 2023 |
| Borkett Properties Limited | Real estate | 2025 |
| Brandy Hole Moorings Limited | Arts & recreation | 2010 |
| Brandy Hole Shellfish Company Limited | Extraterritorial | 2026 |
| Brandy Hole Storage Company Limited | Other services | 2026 |
| Brayston Limited | Construction | 2017 |
| Brew TOK Limited | Wholesale & retail | 2025 |
| Bright Futures Recruitment Ltd | Administrative & support | 2025 |
| Brighter Homes Cleaning Services Limited | Other services | 2015 |
| Briski Ltd | Transport & logistics | 2025 |
| Britannia Estates (Essex) Limited | Real estate | 2023 |
| Broad Walk (Hockley) Management Company Limited | Real estate | 2000 |
| Brothers Barber Ltd | Other services | 2025 |
| Brotherwood Mechanical Services Limited | Construction | 2023 |
| Broughton Education Consulting Limited | Education | 2017 |
| Brush & Blade Ltd | Professional & scientific | 2011 |
| BS Properties Group Ltd | Real estate | 2024 |
| BSM Packaging Supplies Limited | Wholesale & retail | 1990 |
| Buildgen Building Services Ltd | Construction | 2025 |
| Bullet Facilitation Limited | Administrative & support | 2016 |
| Butterflies Club C.I.C. | Administrative & support | 2018 |
| Butterworth Estate Solutions Ltd | Financial services | 2025 |
| BYL Connect Limited | Financial services | 2022 |
| BYL Solutions Limited | Information & communication | 2022 |
| Byrne Driveways Limited | Construction | 2024 |
| C a Becks & SON Ltd | Construction | 2016 |
| C J Blinds Ltd | Wholesale & retail | 2003 |
| C J Gardner Accountants Limited | Professional & scientific | 2002 |
| C K Blinds Ltd | Wholesale & retail | 2009 |
| C.C.H.Construction & Erection Limited | Wholesale & retail | 1958 |
| C4 Candy Shop Ltd | Wholesale & retail | 2024 |
| Cabinet Creations Essex Ltd | Manufacturing | 2014 |
| Caldora Compliance Limited | Information & communication | 2026 |
| Caldora Consulting Ltd | Construction | 2025 |
| Caldora Limited | Information & communication | 2026 |
| Care and Connect Education Ltd | Education | 2026 |
| Careiskey Limited | Administrative & support | 2022 |
| Carl Butler Limited | Agriculture & fishing | 2002 |
| Carter Stanton Projects Ltd | Construction | 2026 |
| Castle Joiners (Wakering) Limited | | 1984 |
| Catering Elite Limited | Administrative & support | 2012 |
| Catmar Construction Ltd | Construction | 2022 |
| Cbliss Property Limited | Real estate | 2018 |
| CBX Digital Ltd | Information & communication | 2025 |
| CCT Investments Ltd | Real estate | 2020 |
| CDS Tree Services Ltd | Administrative & support | 2024 |
| Cedar Mechanical and Electrical Ltd | Construction | 2022 |
| Centreline Fit-Out Ltd | Construction | 2016 |
| Chalkley Services Limited | Transport & logistics | 2003 |
| Chameleon Productions Limited | Arts & recreation | 2018 |
| Chancery Partners LLP | | 2025 |
| Checked Invest Ltd | Professional & scientific | 2019 |
| Cheema Garments Limited | | 1982 |
| Chelsea Event Hire Limited | Hospitality | 2021 |
| China City 2023 Ltd | Hospitality | 2023 |
| Chutney Made in Essex Limited | Hospitality | 2023 |
| City MEP Limited | Professional & scientific | 2019 |
| Cjctechnical Ltd | Professional & scientific | 2026 |
| CK Accounting & Tax Ltd | Professional & scientific | 2023 |
| CKT Services Ltd | Construction | 2024 |
| Cladding Essex Ltd | Construction | 2018 |
| Clarkio Housing Ltd | Real estate | 2017 |
| Classic Car Business Ltd | Wholesale & retail | 2024 |
| CLG Projects Landscape and Groundwork Ltd | Administrative & support | 2022 |