| AX4U Limited | Other services | 2009 |
| AXE PUB Ltd | Hospitality | 2013 |
| Axiom Classes Ltd | Education | 2021 |
| AXO Valdama Ltd | Professional & scientific | 2026 |
| Axon Health Ltd | Health & social care | 2021 |
| AXZ Services Limited | Professional & scientific | 2024 |
| Ayan Mosque CIC | Other services | 2025 |
| Aydnari Kids Ltd | Real estate | 2022 |
| Ayhan Properties Limited | Real estate | 2018 |
| Ayhi Ltd | Wholesale & retail | 2021 |
| Ayla Management Ltd | Health & social care | 2023 |
| Ayla Nora Ltd | Health & social care | 2019 |
| Ayle & Ayle Ltd | Health & social care | 2014 |
| Ayletts Management Company Limited | Households | 1988 |
| Aymish Ltd | Hospitality | 2020 |
| AYR Group Limited | Real estate | 2022 |
| Ayrock Investments Limited | Real estate | 2020 |
| Ayushivi Technologies Ltd | Information & communication | 2025 |
| AZ FM Services Ltd | Administrative & support | 2025 |
| AZ Payroll Ltd | Wholesale & retail | 2024 |
| Azalea Property Investments Ltd | Real estate | 2025 |
| Azimuth Advisory LLP | | 2025 |
| AZM Medical Enhancement Limited | Health & social care | 2020 |
| Aznik Trading Ltd | Wholesale & retail | 2026 |
| Aztec Nails Beauty Ltd | Other services | 2018 |
| Azuril Logistics Ltd | Construction | 2021 |
| Azzuria Resources Limited | Real estate | 2020 |
| B & L.M. Services Limited | Other services | 1997 |
| B & M Print Limited | Manufacturing | 2016 |
| B & S Hardware Limited | Wholesale & retail | 2006 |
| B a O Properties Ltd | Real estate | 2016 |
| B Bilby Surveyors Limited | Professional & scientific | 2000 |
| B C Cook Roofing Ltd | Construction | 2011 |
| B Dogs Limited | Administrative & support | 2016 |
| B I Johnson Marketing Limited | Wholesale & retail | 2016 |
| B K & D Limited | Real estate | 2006 |
| B M Equestrian Limited | Agriculture & fishing | 2023 |
| B OUT of Home Limited | Professional & scientific | 2026 |
| B Polygraph Testing Ltd | Administrative & support | 2019 |
| B R Strathern Ltd | Other services | 2016 |
| B&A Dog Walkers Ltd | Other services | 2023 |
| B&R Building Construction Ltd | Construction | 2021 |
| B&T Pleasure Homes Ltd | Hospitality | 2023 |
| B-Hive Supplies Ltd | Wholesale & retail | 2015 |
| B. a. Turner Site Investigations Limited | Construction | 2019 |
| B.C.K. Logistics Ltd | Transport & logistics | 2007 |
| B.D.R. Micro Instruments Limited | Manufacturing | 1991 |
| B.Dynes & SON Civils Ltd | Construction | 2024 |
| B.Goulding Ltd | Financial services | 2025 |
| B.J.'s of Woodham Limited | Real estate | 1981 |
| B.L. Acoustics Limited | Other services | 1998 |
| B.S.Rackley Limited | Arts & recreation | 2012 |
| B1 Network Systems Ltd | Information & communication | 2021 |
| B2018 Ltd | Construction | 2018 |
| B2B Portals Limited | Information & communication | 2014 |
| B3MS Consultancy Limited | Health & social care | 2015 |
| B4V Ltd | Information & communication | 2024 |
| BA Management and Design Limited | Administrative & support | 2010 |
| Baaklon Limited | Wholesale & retail | 2022 |
| Babtalk Investments Limited | Financial services | 2019 |
| Babuci Ltd | Professional & scientific | 2010 |
| Baby Bliss Boutique Limited | Wholesale & retail | 2026 |
| Baby Nurture Limited | Education | 2021 |
| Babyballers Australia Limited | Arts & recreation | 2020 |
| Babyballers Franchise Limited | Arts & recreation | 2017 |
| Babyballers Group Limited | Arts & recreation | 2020 |
| Back Earth Ltd | Wholesale & retail | 2023 |
| Backhouse Solicitors Limited | Professional & scientific | 2009 |
| Badar Investments Holding Ltd | Real estate | 2020 |
| Badbury Interim Management Limited | Professional & scientific | 2015 |
| Baddow Analysis Limited | Health & social care | 2008 |
| Baddow Capital Limited | Financial services | 2026 |
| Baddow Court Residents Association Limited | Real estate | 1985 |
| Baddow Heating Limited | Administrative & support | 2003 |
| Baddow Locksmiths Ltd | Administrative & support | 2021 |
| Baddow Park Events Limited | Administrative & support | 2018 |
| Baddow Park Industrial Estate Limited | Real estate | 2018 |
| Baddow Restaurant Ltd | Hospitality | 2020 |
| Baddow Road Ltd | Administrative & support | 2020 |
| Baddow Road Supplies Limited | Wholesale & retail | 1978 |
| Baddow Safety Solutions Limited | Other services | 2017 |
| Baddow Stays Ltd | Hospitality | 2026 |
| Badshot LEA Trading Limited | Wholesale & retail | 2014 |
| BAE1 Ltd | Professional & scientific | 2025 |
| Baeren Holdings Limited | Real estate | 2026 |
| BAG Asset Holdings Ltd | Real estate | 2026 |
| Bagley Investment Group Ltd | Financial services | 2022 |
| Baig and Habib Homes Ltd | Real estate | 2026 |
| Bailey Fire Consultancy Limited | Professional & scientific | 2023 |
| Baitus Salam Properties Ltd | Real estate | 2025 |
| Bajw Ltd | Wholesale & retail | 2026 |
| Baked Happiness Ltd | Wholesale & retail | 2022 |
| Baked Tanning Limited | Other services | 2025 |
| Baker & Sons(Danbury)Limited | Real estate | 1947 |
| Baker Ellis Construction Limited | Professional & scientific | 2024 |
| Bakergomez Limited | Real estate | 2013 |
| Bakers and Ponies Ltd | Information & communication | 2025 |
| Bakers Funeral Services Limited | Other services | 2019 |
| Bakers Holdings Limited | Real estate | 2005 |
| Bakers of Danbury Contracts Limited | Construction | 2019 |