| 00190697 Limited | | 1923 |
| 110 Lettings Limited | Real estate | 2023 |
| 1ST Choice GAS Services Limited | Administrative & support | 2000 |
| 1ST Financial Services(London) Limited | Financial services | 2006 |
| 3GB Limited | Construction | 2003 |
| A F C O Building Services Limited | | 1988 |
| A.L.Selden & SON Limited | | 1962 |
| Ace Furnace Consulting Limited | Professional & scientific | 2006 |
| Action Learning Partnership Limited | Professional & scientific | 1995 |
| Active Engineering (GB) Limited | Manufacturing | 2003 |
| Adcal Holdings Limited | Professional & scientific | 2003 |
| Advanced Business Systems Limited | | 1988 |
| Aero Mate Limited | Professional & scientific | 2002 |
| Affectiva UK Ltd | Professional & scientific | 2021 |
| AFM Services Limited | Construction | 2006 |
| Agency Window Services Limited | | 1981 |
| Agile Clarity Limited | Manufacturing | 1984 |
| AJ Scientific Ltd | Professional & scientific | 2006 |
| Alan Tyler and Associates Ltd | Professional & scientific | 2008 |
| Alastair Ross Ltd | Arts & recreation | 2002 |
| Alcan Design and Development Limited | | 1959 |
| Alcan Industries Limited | | 1909 |
| Alderbourne Properties Limited | Real estate | 2006 |
| Alinor Ltd | Information & communication | 2015 |
| ALL Smiles Limited | Health & social care | 2002 |
| Allied CFM Limited | Professional & scientific | 2025 |
| Allphase Electrical Solutions Limited | Construction | 2021 |
| Alpina Building & Landscaping Ltd | Construction | 2007 |
| Alteroption Limited | | 1991 |
| Altonfield Properties Limited | Real estate | 1988 |
| AMB Building Contractors Limited | Construction | 2007 |
| Amber Beeches Limited | Health & social care | 2014 |
| AMY Kershaw Limited | Administrative & support | 2017 |
| AN45 UK Ltd | Extraterritorial | 2023 |
| Angels Recruitment Solutions Limited | Administrative & support | 2022 |
| Anjuman-Ul-Muslimeen Limited | Other services | 1971 |
| Anthony Bruton Leisure Limited | Hospitality | 1978 |
| Anthony Whitmee & Associates Limited | Administrative & support | 1978 |
| Apache Plumbing and Bathrooms Limited | Construction | 2008 |
| Arias & Egea Spanish Translations Ltd | Administrative & support | 2002 |
| Art Perspective Limited | Education | 2002 |
| Artisan Limited Edition Ltd | Wholesale & retail | 2017 |
| Asatru UK CIC | Wholesale & retail | 2022 |
| ASH Builders Decorators & Property Maintenance Limited | Wholesale & retail | 2007 |
| Ashridge Travel Limited | | 1984 |
| Atelier Architecture & Design Limited | Professional & scientific | 1994 |
| Autism Early Support Trust Limited | Education | 2011 |
| Auto Teck Limited | Wholesale & retail | 2002 |
| Avenues Estate Agents Limited | Real estate | 2004 |
| Aylesbury Fire Systems Ltd. | Construction | 1994 |
| B X Electrics Limited | Construction | 2008 |
| B.E.Enterprises Limited | Wholesale & retail | 1959 |
| Banbury Autos Ltd | Wholesale & retail | 2006 |
| Barnham Consultants Limited | | 1985 |
| Barrels of Numbers Ltd | Professional & scientific | 2026 |
| Basklight Limited | | 1981 |
| Bayman Manor Residents Association Ltd | Households | 2001 |
| Benjamin Goodearl & Sons Limited | Professional & scientific | 1950 |
| Beyond the Basics Limited | Construction | 2003 |
| Bird & Bird (Salons) Limited | Administrative & support | 2016 |
| Blackfields Ltd | Financial services | 2006 |
| Bland Electrical Limited | | 1980 |
| Blue GEM Investments Limited | Real estate | 2005 |
| Blue Orchid Investments Ltd | Real estate | 2019 |
| BML General Partner Limited | Financial services | 2006 |
| Bolton Services Limited | Administrative & support | 2003 |
| Boxmoor Investments Ltd | Financial services | 2018 |
| Brick Makers & Factors Limited | | 1933 |
| Bruton Solutions Limited | Administrative & support | 2005 |
| Buckinghamshire Natural Health Ltd | Health & social care | 2013 |
| Bucks EYE Surgery Ltd | Health & social care | 2024 |
| Burgess Investments Limited | Professional & scientific | 1963 |
| Burnham Beeches Golf Club,Limited(The) | Arts & recreation | 1909 |
| Busson Limited | Other services | 1957 |
| C D Vision Limited | Professional & scientific | 2004 |
| C N P Developments Limited | Construction | 1998 |
| C P Business Services Ltd | Administrative & support | 2002 |
| C. & J. Hextall Limited | Transport & logistics | 1977 |
| C.T.M.S. Ltd. | Administrative & support | 1993 |
| Cable Installation Accessories Limited | | 1978 |
| Call Centre Works Ltd | Professional & scientific | 2005 |
| Capability Landscapes Ltd | Administrative & support | 1987 |
| Capita Construction Limited | Construction | 2001 |
| Capture Experts (UK) Limited | Information & communication | 2007 |
| Carter Ductwork Limited | Manufacturing | 2005 |
| Carzmetics Ltd | Wholesale & retail | 2006 |
| Castellum Holdings Limited | | 1980 |
| Castle Building Contractors (High Wycombe) Limited | Construction | 2002 |
| Catian Limited | Professional & scientific | 1981 |
| Cavendish & Ambrose Limited | | 1991 |
| Cges Ltd | Professional & scientific | 2003 |
| Chesham EYE Options Limited | Wholesale & retail | 2004 |
| Chiltern Electronic Services Limited | Manufacturing | 2003 |
| Chiltern Opticians Limited | Health & social care | 2001 |
| Chiltern Renovations Limited | Wholesale & retail | 1982 |
| Choralpe Limited | Information & communication | 2005 |
| Chris Muldoon Consulting Limited | Health & social care | 2007 |
| Clark Pritchard Milton Keynes Ltd | Professional & scientific | 2003 |
| Clear Physiotherapy and Sports Injury Clinic Ltd | Health & social care | 2003 |
| Clinical Trials Consulting & Training Limited | Professional & scientific | 2007 |