| Awford House Ltd | Real estate | 2022 |
| AWS Enterprises Limited | Other services | 2017 |
| Awtec IT Engineering Limited | Information & communication | 2009 |
| Axeley Electrical Ltd | Construction | 2023 |
| Axial Group Ltd | Construction | 2019 |
| Axiom Media Holdings Ltd | Financial services | 2022 |
| Axiom Media Networks Ltd | Professional & scientific | 2023 |
| Axola Kitchens & Interiors Ltd | Professional & scientific | 2025 |
| AYB Studios Ltd | Arts & recreation | 2025 |
| Ayima AI Ltd | Professional & scientific | 2026 |
| Ayima Holdings Limited | Financial services | 2016 |
| Ayima Investments Limited | Administrative & support | 2024 |
| Ayima UK Limited | Information & communication | 2008 |
| Ayshford Sansome Ltd | Professional & scientific | 2016 |
| AYZA25 Ltd | Hospitality | 2026 |
| AZ Discovery Limited | Professional & scientific | 2020 |
| Azimuth Construction Limited | Construction | 2023 |
| B & B Construction Recruitment Ltd | Administrative & support | 2021 |
| B & E Consulting Limited | Professional & scientific | 2008 |
| B & G Doors Ltd | Construction | 2023 |
| B & K Reinforced Walls and Ceilings Ltd | Construction | 2019 |
| B & T Spares Ltd | Wholesale & retail | 2026 |
| B B L Electrical Limited | Construction | 2008 |
| B C Services Benfleet Limited | Construction | 2017 |
| B C Steelfixing & Bar Bending Specialist Ltd | Construction | 2018 |
| B E Installations Ltd | Construction | 2019 |
| B J Unwin Roofing Limited | Construction | 2014 |
| B Smart Electrical Limited | Construction | 2006 |
| B Sublime Limited | Real estate | 2025 |
| B Thomas Construction Limited | Construction | 2022 |
| B&J Grand Design Ltd | Construction | 2013 |
| B.B. Appliances Ltd | Other services | 2014 |
| B.C.P Investments & Management Limited | Real estate | 2026 |
| B.Webb Roofing Ltd | Construction | 2016 |
| BA Industrial Ltd | Construction | 2021 |
| Baars Construction Limited | Construction | 2020 |
| BAB Contractors Ltd | Construction | 2011 |
| Babbles Solutions Limited | Professional & scientific | 2016 |
| Baboush Limited | Hospitality | 2015 |
| Babsbodyfit Ltd | Other services | 2019 |
| Baby Eats OUT Ltd | Information & communication | 2020 |
| Bacaro Leigh Limited | Hospitality | 2017 |
| Bacoa Ltd. | Households | 2012 |
| Badda Ltd | Information & communication | 2024 |
| Badgers DEN (Care) Limited | Health & social care | 2019 |
| Bailey Freehold Investments Ltd | Real estate | 2015 |
| Bailey Plumbing Group Ltd | Construction | 2026 |
| Baileys Property Limited | Real estate | 2020 |
| Bainbridge Solutions Limited | Public administration | 2021 |
| Bake Chalkwell Ltd | Hospitality | 2025 |
| Bake D.R Ltd | Hospitality | 2025 |
| Bake Leigh Limited | Hospitality | 2023 |
| Bake Leigh on Sea Ltd | Hospitality | 2026 |
| Bake Manners Way Ltd | Hospitality | 2023 |
| Bakecraft Ltd | Manufacturing | 2023 |
| Baker Game Studios Limited | Information & communication | 2026 |
| Baker Robinson Limited | Professional & scientific | 2021 |
| Bakersfield Classics Ltd | Wholesale & retail | 2023 |
| Bakos Construction Limited | Construction | 2023 |
| BAL2008 Ltd | Wholesale & retail | 2008 |
| Balady Limited | Hospitality | 2018 |
| Balance & Company (Essex) Limited | Construction | 2016 |
| Balanceefy Ltd | Transport & logistics | 2025 |
| Ballast Blocks Limited | Construction | 2019 |
| Ballinross Services Limited | Education | 2022 |
| Balloon Management Ltd | Households | 2025 |
| Ballout Limited | Health & social care | 2017 |
| Ballridge Limited | Construction | 2010 |
| BAN Thai Massage & Spa Ltd | Other services | 2016 |
| Banfield Partnership Ltd | Professional & scientific | 2018 |
| Bank House Fairford Ltd | Households | 2019 |
| Bankside Construction Ltd | Construction | 2018 |
| Bardfields Estate Management Company Limited | Extraterritorial | 1999 |
| Bare Knuckle Productions Limited | Information & communication | 2025 |
| Barefoot Recruitment Ltd | Administrative & support | 2021 |
| Barkerhouse 1 Limited | Administrative & support | 2021 |
| Barkers & Bunters Property Limited | Real estate | 2020 |
| Barlow & Fields Limited | Hospitality | 2012 |
| Barnes Advisory Limited | Professional & scientific | 2026 |
| Barofay Limited | Professional & scientific | 2002 |
| Barrelmaker Media Ltd | Information & communication | 2026 |
| Barretts Roofing & Guttering Limited | Construction | 2025 |
| Barrons Corporate Finance Limited | Administrative & support | 2017 |
| Barry Graham Limited | Other services | 2004 |
| Bart-Ray Co. Limited | Hospitality | 2024 |
| Barthaud Holdings Limited | Hospitality | 2019 |
| Bartley Square Management Company Limited | Households | 2020 |
| Basa Enterprises Ltd | Wholesale & retail | 2018 |
| Base Camp Properties Limited | Real estate | 2022 |
| Base Camp Services Ltd | Information & communication | 2020 |
| Base Connect Group Ltd | Information & communication | 2021 |
| Base Connect Ltd | Information & communication | 2011 |
| Basildon Homes Limited | Construction | 2026 |
| Bastet Wealth Management Ltd | Financial services | 2024 |
| Bathroom and Plumbing Services Limited | Construction | 2018 |
| Bay Lets Ltd | Real estate | 2020 |
| Bayfield Property Ventures Limited | Professional & scientific | 2024 |
| BB Osteopathy (Essex) Limited | Health & social care | 2022 |
| BB Property Holdings Ltd | Real estate | 2016 |
| BB Sky Ltd | Wholesale & retail | 2020 |