| AW Design & Build Solutions Ltd | Construction | 2017 |
| Awesome Travel Holidays Ltd | Administrative & support | 2016 |
| Axenia Ltd | Hospitality | 2025 |
| Axia Ignite Ltd | Professional & scientific | 2025 |
| Ayam Atma Brahma Unlimited Ltd | Professional & scientific | 2022 |
| Ayikis Limited | Wholesale & retail | 2025 |
| Aylas Cars Ltd | Wholesale & retail | 2024 |
| Aylesbury Recycling Composting (ARC) Limited | Water & waste | 2019 |
| Aymer Clearance Limited | Administrative & support | 2020 |
| Aymer Skips Limited | Administrative & support | 2015 |
| Azario Ltd | Wholesale & retail | 2026 |
| Azemi Group Limited | Construction | 2022 |
| Azemsys Limited | Professional & scientific | 2025 |
| Aztek UK Limited | Wholesale & retail | 2025 |
| B S Construction (Hounslow) Ltd | Construction | 2019 |
| B T L Carpoint Ltd | Wholesale & retail | 2017 |
| BA Plastering & Decorating Ltd | Construction | 2018 |
| Babal Construction Ltd | Construction | 2025 |
| Baby on Board.Uk Limited | Extraterritorial | 2015 |
| Backstage @ 47 Limited | Wholesale & retail | 2015 |
| Baeba Limited | Wholesale & retail | 2025 |
| Bains Research and Consulting Limited | Professional & scientific | 2022 |
| Bajaj Investments Ltd | Wholesale & retail | 2022 |
| Ballyhale Trading Limited | Extraterritorial | 2025 |
| Balstate Services Limited | Administrative & support | 1993 |
| Baltasar Transport Limited | Transport & logistics | 2024 |
| Baltic Construction Ltd | Construction | 2023 |
| BAM Landscapes Ltd | Administrative & support | 2024 |
| Bamboo Flowers Ltd | Wholesale & retail | 2017 |
| Bankside Flats Management Company Limited | Households | 1987 |
| Banner Mechanical Services Ltd | Construction | 2026 |
| Bansals Hydraulic Limited | Wholesale & retail | 1997 |
| Bar Beez Limited | Wholesale & retail | 2020 |
| Barbican City Ltd | Real estate | 2026 |
| Barima Tech Ltd | Professional & scientific | 2022 |
| Barn House Property Ltd | Real estate | 2018 |
| Barons Wood Residents Management Company Limited | Households | 2011 |
| Barscometoyou Limited | Hospitality | 2024 |
| Bartlett Roofing Ltd | Construction | 2019 |
| Basement Construction Limited | Construction | 2010 |
| Bashir Accountants Limited | Professional & scientific | 2021 |
| Bashir Memon & Co Ltd | Professional & scientific | 2025 |
| Bass & Caird Wine Merchants Ltd | Wholesale & retail | 2013 |
| Bathroom 104 Ltd | Construction | 2024 |
| Battlekart AR Ltd | Arts & recreation | 2025 |
| Baxters Consultancy Limited | Health & social care | 2019 |
| BBK Construction Consultancy Ltd | Construction | 2016 |
| BBS Driving Ltd | Transport & logistics | 2019 |
| BC & SBR Group Ltd | Construction | 2020 |
| BDG Foods Ltd | Wholesale & retail | 2015 |
| Be-Green Electrical Ltd | Construction | 2016 |
| Beauchamp Leisure Ltd | Hospitality | 2024 |
| Beauty by Sandy Limited | Other services | 2026 |
| Bedfont Gate (Blocks A,B,C,D,E,F) Management Company Limited | Households | 1995 |
| Bedfont Gate (Blocks G,H,J,K,L) Management Company Limited | Households | 1996 |
| Bedfont Gate (Blocks M,N,P & Q) Management Company Limited | Households | 1997 |
| Bedfont Gate (Blocks U,V,W & X) Management Company Limited | Households | 1997 |
| Bedi Cricket Coaching Limited | Information & communication | 2012 |
| BEE by Elis Ltd | Wholesale & retail | 2025 |
| Beech Tree Court Ltd | Hospitality | 2014 |
| Beets Ltd | Construction | 2025 |
| Begent Ltd | Administrative & support | 2021 |
| Bejan Delivery Services Ltd | Transport & logistics | 2020 |
| Belfrage Surveying Services Limited | Professional & scientific | 2024 |
| Bell Engineering Services Ltd | Construction | 2018 |
| Bellarosie Limited | Education | 2025 |
| Bellview Drake House Limited | Construction | 2021 |
| Bellview Freeholds Limited | Construction | 2019 |
| Bellview Fusion Limited | Construction | 2019 |
| Bellview Group Limited | Construction | 2018 |
| Bellview Investments Limited | Real estate | 2019 |
| Bellview Kearton Close Limited | Construction | 2021 |
| Bellview Purley Downs Limited | Construction | 2022 |
| Bellview the Woodfields Limited | Construction | 2020 |
| Bellview Vansittart Road Limited | Construction | 2022 |
| Bengisu Ltd | Information & communication | 2007 |
| Berbice Ocean Edge Ltd | Professional & scientific | 2024 |
| Berkeley Hunt Properties Limited | Real estate | 2013 |
| Berkshire Recycling Ltd | Administrative & support | 2018 |
| Berkshire Waste Recycling Ltd | Water & waste | 2019 |
| Besshall Limited | Real estate | 1999 |
| Best Metal Work Ltd | Manufacturing | 2017 |
| Best of Box Limited | Information & communication | 2015 |
| Best Pets Gifts Ltd | Wholesale & retail | 2020 |
| Bethel 7 Services Ltd | Health & social care | 2022 |
| Bevon Cricket Academy Ltd | Arts & recreation | 2023 |
| Bewleys Sausage Limited | Manufacturing | 2024 |
| Bhim Sharma Construction Ltd | Construction | 2025 |
| Bhogal Investment Group Limited | Real estate | 2025 |
| Bibury Services Ltd | Transport & logistics | 2026 |
| Big BEN Chauffeurs Ltd | Other services | 2009 |
| Big BEN Removal & Cleaning Ltd | Transport & logistics | 2025 |
| Big Blue Square Limited | Administrative & support | 2004 |
| Big Web Theory Ltd. | Wholesale & retail | 2017 |
| BIO-31 Ltd | Administrative & support | 2025 |
| Birch Court Management Company (Langley) Limited | Households | 1987 |
| Biryanimax Hayes Limited | Extraterritorial | 2023 |
| Biryanimax Southall Limited | Hospitality | 2023 |
| Bishop FOX Limited | Information & communication | 2022 |
| Bishops Scientific UK Limited | Wholesale & retail | 2024 |