| Ascentor Cyber Limited | Administrative & support | 2010 |
| Ashcott Services Limited | Administrative & support | 2003 |
| Ashlake Properties (Hastings) Limited | Administrative & support | 2006 |
| Ashmax Ltd | Financial services | 2015 |
| Ashmere Resident (3) Management Company Limited | Households | 2026 |
| Ashvee Properties Ltd | Households | 2025 |
| Aspal Construction Limited | Construction | 2009 |
| Aspect Property Renovations Limited | Construction | 2012 |
| Aspect Spray Plastering Limited | Construction | 2022 |
| Associated International Management LLP | | 2007 |
| Associates Support & Network Services Ltd | Professional & scientific | 2012 |
| Astran Cargo Ltd | Transport & logistics | 2019 |
| Aswani Homes Ltd | Construction | 2023 |
| AT the Bottom of the Garden Limited | Wholesale & retail | 2005 |
| Atag Heating Technology UK Limited | Wholesale & retail | 2014 |
| Atana People Ltd | Administrative & support | 2025 |
| Athlin Limited | Arts & recreation | 2023 |
| Atlantic PLG Limited | Financial services | 2018 |
| Atlantic Project Cargo Limited | Transport & logistics | 2007 |
| Atlas Carpentry Ltd | Manufacturing | 2022 |
| Atlas Electrical Private Limited | Construction | 2022 |
| ATM Wilson Ltd | Professional & scientific | 2024 |
| Atmosphere Design Studio Ltd | Professional & scientific | 2020 |
| Aurium Protection Ltd | Administrative & support | 2026 |
| Austin Construction Logistics Limited | Administrative & support | 2020 |
| Austin Construction Resources Ltd | Administrative & support | 2016 |
| Austin Design Build & Maintenance Ltd | Construction | 2019 |
| Autocar BUS & Coach Services Limited | Transport & logistics | 2001 |
| Autotec Marketing Limited | Professional & scientific | 1989 |
| Avantis Developments Ltd | Construction | 2023 |
| Axon Clinical Services Ltd | Health & social care | 2016 |
| B Coldwell Renovations Ltd | Construction | 2023 |
| B King Carpentry Ltd | Construction | 2018 |
| B. Hawkins Consultancy Ltd | Professional & scientific | 2004 |
| BA Trans Logistics Ltd | Transport & logistics | 2022 |
| BAC Leasing Limited | Wholesale & retail | 2010 |
| Backbone AV Ltd | Information & communication | 2025 |
| Backbone Software Ltd | Information & communication | 2023 |
| Badgells Wood Limited | Arts & recreation | 2012 |
| Bakewell Systems Limited | Information & communication | 1996 |
| Balloon Shop Kent Ltd | Wholesale & retail | 2022 |
| Bamford Park (Lighthorne) Management Company Limited | Households | 2024 |
| Bancroft Wood (Kings Hill) Management Limited | Households | 2006 |
| Bandshop Ltd | Arts & recreation | 2021 |
| Banyu Limited | Health & social care | 2026 |
| Bar 306 Limited | Hospitality | 2024 |
| Bar-Ad Ltd | Households | 2021 |
| Barker Bros Consulting Ltd | Professional & scientific | 2021 |
| Barleyfields Ashchurch Management Company Limited | Households | 2017 |
| Barnston Way (Freehold) Limited | Households | 1999 |
| Barr Equine Veterinary Limited | Professional & scientific | 2018 |
| Barrington & Sargeant Ltd | Wholesale & retail | 2026 |
| Basketdrop Ltd. | Manufacturing | 2018 |
| Bassett Simmonds Property Development Ltd | Construction | 2021 |
| Bassi Hub Ltd | Professional & scientific | 2025 |
| Battlegames Limited | Arts & recreation | 2025 |
| Bayhall Developments Limited | Construction | 2026 |
| Baytrix Ltd | Information & communication | 2024 |
| BBC Languages Limited | Professional & scientific | 1999 |
| BE Systems Limited | Administrative & support | 2022 |
| BE Well Fitness & Nutrition Limited | Health & social care | 2025 |
| Beaming House Ltd | Administrative & support | 2026 |
| Beanacre Manor Estate Limited | Professional & scientific | 2020 |
| Bear Fire Services Limited | Public administration | 2026 |
| Beasley Growth Partners Ltd | Information & communication | 2025 |
| Beau Edward Limited | Professional & scientific | 2021 |
| Beautiful Designs Studio Ltd | Professional & scientific | 2020 |
| Beautiful Products Ltd | Wholesale & retail | 2016 |
| Beautiful Properties Ltd | Real estate | 2015 |
| Beavington Composting and Recycling Solutions Ltd | Agriculture & fishing | 2022 |
| BEE Haus Ltd | Administrative & support | 2024 |
| BEE Haus Partnership Ltd | Professional & scientific | 2009 |
| Beech & Chestnut (Freehold) Limited | Households | 2008 |
| Beeches Solutions Ltd | Professional & scientific | 2015 |
| Beechwood Drive Management Limited | Households | 2023 |
| Before Time Flies Ltd | Professional & scientific | 2023 |
| Belea Ltd | Administrative & support | 2021 |
| Bellam & Co. Limited | Wholesale & retail | 1988 |
| Bellingan I B Limited | Financial services | 2017 |
| Belmont Street JV LLP | | 2021 |
| Bemorewe Ltd | Extraterritorial | 2020 |
| Berkshire Land Limited | Professional & scientific | 1980 |
| Berwins Law Holdings Limited | Financial services | 2016 |
| Berwins Solicitors Limited | Professional & scientific | 2009 |
| Beso TR Ltd | Construction | 2021 |
| Bespoke Leisure & Workwear Ltd | Wholesale & retail | 2018 |
| Best Business Events Ltd | Administrative & support | 2010 |
| Best Way Travel Limited | Administrative & support | 2020 |
| Best Western International Limited | Hospitality | 1985 |
| Beverley Hyrst Property Company Limited | Households | 1985 |
| Beverley South Developments Limited | Real estate | 2015 |
| BIA Trading Ventures Ltd | Information & communication | 2022 |
| Bigger Living Limited | Construction | 2018 |
| Biriyana Ltd | Hospitality | 2025 |
| Birling Estate Limited | Professional & scientific | 1966 |
| Birmingham City Hospital Residents Management Company Limited | Households | 2026 |
| Biscberrybuilding Ltd | Construction | 2017 |
| Bishops Park Limited | Professional & scientific | 1987 |
| Bitcoin Racing Limited | Arts & recreation | 2022 |
| Bizmark Enterprises Ltd | Real estate | 2016 |