| Aston Sales of Kensington Limited | Wholesale & retail | 2006 |
| Astrala Homes Ltd | Construction | 2022 |
| Atlas Aerials Limited | Extraterritorial | 1992 |
| Atlas Direct Limited | Administrative & support | 2003 |
| Auchenflower Management Limited | Professional & scientific | 2026 |
| Audacity Property Limited | Real estate | 2020 |
| Auriga SB Limited | Manufacturing | 2004 |
| Austin Morris Limited | Administrative & support | 1995 |
| Automania Group Limited | Wholesale & retail | 2000 |
| Automania Limited | Professional & scientific | 2001 |
| Automotive Warranty Services Ltd | Professional & scientific | 2007 |
| Avalon Computer Training Limited | Information & communication | 2003 |
| Avercet Property Ltd | Construction | 2004 |
| Avita Communications Limited | Information & communication | 2021 |
| Awinta Limited | Professional & scientific | 2013 |
| Axent Investments Ltd | Financial services | 2001 |
| Aywa Ltd | Manufacturing | 2015 |
| Az.Trendsensors Ltd | Wholesale & retail | 2024 |
| B C I (UK) Limited | Wholesale & retail | 2003 |
| B Devine Consultancy Limited | Professional & scientific | 2005 |
| B S Motorsport Limited | Wholesale & retail | 1996 |
| B2B Cloud Solutions Ltd | Manufacturing | 2020 |
| Baby Swimming South Bucks LLP | | 2015 |
| Balicrest Limited | Construction | 1988 |
| Banbury Windows and Conservatories Limited | Construction | 2002 |
| Bandit Music Limited | Information & communication | 1998 |
| Barbara Bone Upholstery Courses Limited | Other services | 1994 |
| Barclay Corporation Limited | Professional & scientific | 2000 |
| Bardolph Close Residents Limited | Households | 1998 |
| Barton Reynolds Limited | Wholesale & retail | 2007 |
| Baskk Properties Limited | Real estate | 2024 |
| BBT Webmasters Limited | Information & communication | 2011 |
| Bcuc (Conferences) Limited | Education | 1989 |
| Beaconsfield Squash Club Limited | Arts & recreation | 1995 |
| Beattie & Co Accountants Ltd | Professional & scientific | 2023 |
| Beautythirst Limited | Administrative & support | 2007 |
| Bedstorm Limited | Hospitality | 2013 |
| Beechdean Bakery Limited | Extraterritorial | 2007 |
| Bekonscot Limited | Arts & recreation | 1977 |
| Bellexcel Limited | Administrative & support | 2015 |
| Benbow Court Management Company Limited | Households | 2004 |
| Benedict Redgrove Limited | Professional & scientific | 2004 |
| Bennet Construction Limited | Construction | 1986 |
| BHK Childcare Limited | Health & social care | 2021 |
| Bicstan Limited | Professional & scientific | 2001 |
| Bihari Society UK | Other services | 2018 |
| BIO Seekers Limited | Professional & scientific | 1981 |
| Bionics Limited | Extraterritorial | 2007 |
| Blackwood (Aylesbury) Limited | Hospitality | 1999 |
| Blade Ice Limited | Wholesale & retail | 2026 |
| Bleeding Edge Solutions Limited | Construction | 1996 |
| Blessai Intellect Limited | Information & communication | 2015 |
| Blue PIG Training Consultancy Ltd | Administrative & support | 2008 |
| Bluebottle Limited | Manufacturing | 2003 |
| Bluedriftdecor Ltd | Wholesale & retail | 2025 |
| Bluesmith Limited | Professional & scientific | 1998 |
| Blyth Softcom Limited | Information & communication | 2000 |
| Bolt Digital Marketing Solutions Ltd | Professional & scientific | 2022 |
| Bonusfan Games Ltd. | Information & communication | 2026 |
| Bordon Developments Holdings Limited | Construction | 2017 |
| Boss Contract Furniture Limited | Manufacturing | 2004 |
| Boxsash Window Factory Ltd | Extraterritorial | 2012 |
| BPL Business Media Group Limited | Information & communication | 2000 |
| Brayshurst Building & Construction Limited | | 2004 |
| Brenard Properties Limited | Construction | 1971 |
| Bretsure Limited | Real estate | 1992 |
| Brian D Suttie (Chesham) Limited | Health & social care | 1999 |
| Brian N. Townley and Company Limited | Financial services | 1980 |
| Bricom.Co.Uk Limited | Wholesale & retail | 1990 |
| Brighter Limited | Manufacturing | 2006 |
| Brinnick Locksmiths and Security Limited | Wholesale & retail | 2006 |
| Brit Deaf Motorsport CIC | Other services | 2026 |
| British Vehicle Rental and Leasing Association Limited | Other services | 1967 |
| BT Tech Limited | Information & communication | 2018 |
| BTL Estates Limited | Real estate | 2020 |
| Btree Limited | Wholesale & retail | 2016 |
| Buckinghamshire Solar Ltd | Extraterritorial | 2023 |
| Buckinghamshire Wills & Trusts Limited | Professional & scientific | 2021 |
| Buzzard Fascias & Fixings Limited | Wholesale & retail | 2005 |
| C S R Support Services Ltd | Administrative & support | 2015 |
| C. T. Wilson & SON Limited | Wholesale & retail | 2003 |
| C.J. Productions Limited | Extraterritorial | 1994 |
| C.P.E. Interiors Limited | Construction | 1992 |
| C.R.Bates & Sons Limited | Professional & scientific | 1938 |
| Caliber Skilled Constructions Limited | Construction | 2020 |
| Candent Limited | Real estate | 1991 |
| Canji Capital Ltd | Other services | 2017 |
| Canmodus Limited | Real estate | 2023 |
| Capital Partitioning Limited | Construction | 1996 |
| Carcleaned.Com Limited | Professional & scientific | 2004 |
| Carewjones.Co.Uk Ltd | Manufacturing | 2011 |
| Carnivores and Herbivores | | 2002 |
| Castle Mercy Healthcare Services Limited | Health & social care | 2022 |
| Causeway Point Management Company Limited | Professional & scientific | 2000 |
| Causeway Software Limited | Information & communication | 2021 |
| Causeway Software Technologies Limited | Information & communication | 2021 |
| Ccmd Limited | Real estate | 1995 |
| Celebrity Speakers Ltd | Professional & scientific | 1983 |
| Cetal Limited | Administrative & support | 2002 |
| Cfsf Limited | Other services | 2019 |