| Apex Homes (Hinckley) Limited | Construction | 2003 |
| Apex Medicare Ltd | Health & social care | 2020 |
| Apex Partnership Limited | Professional & scientific | 2007 |
| Apollo Home Care (UK) Limited | Health & social care | 2023 |
| Appletons Interiors Limited | Construction | 2002 |
| Applications in Cadd Ltd | Information & communication | 1987 |
| Appsol Limited | Information & communication | 1998 |
| Aprenda Ltd | Construction | 2011 |
| Apricot Training Management Limited | Professional & scientific | 2004 |
| Aqua Brands Distribution Holdings Limited | Financial services | 2022 |
| Aqua-Bathics Limited | Construction | 2002 |
| ARC Business Interiors Ltd | Wholesale & retail | 2005 |
| Aristocrate Distributors Limited | Wholesale & retail | 1986 |
| Aristocrate Investments Limited | Other services | 1993 |
| ARK Capital Limited | Professional & scientific | 2004 |
| Armina Properties Limited | Real estate | 2007 |
| Arrow Installations (UK) Limited | Manufacturing | 2004 |
| Artex-Blue Hawk Limited | Extraterritorial | 1945 |
| Artisan Bespoke Furniture Limited | Manufacturing | 2005 |
| ASB Fencing Ltd | Construction | 2006 |
| Asfordby Storage & Haulage Limited | Transport & logistics | 1961 |
| Asha Pharmacy Limited | Health & social care | 2002 |
| Ashall Management Company Limited | Professional & scientific | 2000 |
| Ashapura Millers Limited | Manufacturing | 2000 |
| Ashby Dramatic Society Limited | Arts & recreation | 1977 |
| Ashby Microsystems Limited | Professional & scientific | 1987 |
| Ashby Test Centre Limited | Wholesale & retail | 1998 |
| Ashby-De-La Zouch Museum | Arts & recreation | 1983 |
| Ashfields Restaurant (Earl Shilton) Limited | Hospitality | 2002 |
| Ashwell Electrical Contractors Limited | Construction | 2006 |
| Asian Celebrations Ltd | Information & communication | 2005 |
| Asmt Ltd | Wholesale & retail | 2006 |
| Aspects Managed Solutions Limited | Administrative & support | 2007 |
| Asset Assured Group Limited | Financial services | 2025 |
| Asset Assured Properties Limited | Real estate | 2025 |
| Astleigh Properties Limited | Professional & scientific | 1999 |
| Aston (Melton Mowbray) Limited | Wholesale & retail | 1988 |
| Astralrule Property Management Limited | Households | 1989 |
| ATA Grinding Processes Limited | Wholesale & retail | 1963 |
| AV 100 Ltd | Manufacturing | 2021 |
| Avalanche Adventure Limited | Arts & recreation | 2004 |
| Avon Water Services Limited | Professional & scientific | 2008 |
| B D Braithwaite Limited | Construction | 2003 |
| B Moore Flooring Limited | Construction | 2004 |
| Baby Planet (UK) Limited | Wholesale & retail | 2006 |
| Babyland (UK) Limited | Wholesale & retail | 2007 |
| Bacon 6 Ltd | Professional & scientific | 2007 |
| Baker Consultancy Limited | Professional & scientific | 1993 |
| Baldwin & Francis Limited | Manufacturing | 2019 |
| Ballykeigle Investment Group Limited | Financial services | 2025 |
| Bangladesh Youth and Cultural Shomiti | Education | 1999 |
| Bankfield Direct Limited | Administrative & support | 2003 |
| Bankview Limited | Construction | 2004 |
| Banning Limited | Wholesale & retail | 2003 |
| Barista Limited | Arts & recreation | 2007 |
| Barrie Stephen Diffusion Limited | Other services | 2006 |
| Barrie Stephen Limited | Other services | 2002 |
| Barwell Trailer Hire Limited | Transport & logistics | 2006 |
| Bathroom Giant Ltd | Other services | 2016 |
| Bboss Limited | Information & communication | 2008 |
| Beacon Civils Limited | Wholesale & retail | 2006 |
| Beacon Consultancy Services Limited | Professional & scientific | 2004 |
| Beamo Ltd | Construction | 2013 |
| Beck (GB) Limited | Wholesale & retail | 2000 |
| Beckville Limited | Real estate | 1983 |
| Beechwood Systems Limited | Professional & scientific | 1999 |
| Belgravia Property Management Limited | Real estate | 2003 |
| Bellamy Eyecare Limited | Health & social care | 2006 |
| Belvedere Property Management Limited | Real estate | 2002 |
| Belvoir Residential Properties Limited | Real estate | 2007 |
| Benchmark Building Supplies Limited | Extraterritorial | 1996 |
| Berkley Estate Agents Limited | Real estate | 2004 |
| Bestlife Bathrooms Limited | Construction | 2006 |
| Beyond Team Transformation Limited | Professional & scientific | 1999 |
| BFR International Limited | Information & communication | 1998 |
| Biba Networks Limited | Professional & scientific | 1998 |
| Bills Farm Services Limited | Agriculture & fishing | 2007 |
| Birches Court (the Barracks) Management Company Limited | Households | 1995 |
| Birmingham Drinks Connect Ltd | Wholesale & retail | 2020 |
| Birstall Garden Buildings Limited | Real estate | 2005 |
| Black Swan One Ltd | Other services | 2024 |
| Blackspec Ltd | Wholesale & retail | 2023 |
| Bliss Hairdressing Limited | Other services | 1999 |
| Blueberry Foods Limited | Extraterritorial | 2007 |
| Bluemd Limited | Professional & scientific | 2003 |
| Blueroof Limited | Agriculture & fishing | 2004 |
| Bmls Properties Ltd | Real estate | 2017 |
| Bobateacompany Ltd | Hospitality | 2021 |
| Bolley Brewing & Distillation Ltd | Manufacturing | 2020 |
| Bonding and Reline Services Limited | Other services | 2004 |
| Bonkers Enterprise Limited | Wholesale & retail | 2016 |
| Book-A-Cab Limited | Transport & logistics | 2002 |
| BOW Business Services Limited | Real estate | 2007 |
| Bowdem Limited | Wholesale & retail | 2006 |
| BPB Finance (NO. 4) Limited | Financial services | 2002 |
| BPB Finance (NO.2) Limited | Professional & scientific | 1998 |
| BPB Finance (NO.6) | Extraterritorial | 2003 |
| BPB Group Finance Limited | Professional & scientific | 2005 |
| BPB Group Operations Limited | Professional & scientific | 2005 |
| BPB India Limited | Financial services | 1960 |