| Bovingdons Holdings Ltd | Financial services | 2026 |
| Bovingdons Land Limited | Real estate | 2025 |
| Bovingdons Real Estate (Lettings) Limited | Real estate | 2022 |
| Bovingdons Real Estate Holdings Limited | Financial services | 2021 |
| Bovingdons Real Estate Limited | Real estate | 2017 |
| BPG Journeyman Ltd | Hospitality | 2025 |
| Bptm IP Limited | Professional & scientific | 2025 |
| Bradenham Preformed Wood Components Limited | Wholesale & retail | 2020 |
| Bradenham Properties Limited | Financial services | 2017 |
| Brand Builders Ltd | Administrative & support | 2008 |
| Brand Protect Limited | Professional & scientific | 2010 |
| Brandboost Marketing Ltd | Extraterritorial | 2009 |
| Brave Water Ltd | Water & waste | 2019 |
| Breith Limited | Professional & scientific | 2022 |
| Brent Group Limited | Construction | 1954 |
| Brent Group Property Trading Limited | Real estate | 2022 |
| Brett Owen Investments Limited | Financial services | 2020 |
| Brickchain Property 1 Ltd | Real estate | 2022 |
| Bridge to Health Limited | Health & social care | 2013 |
| Bright Canary Consulting LLP | | 2021 |
| Brighter Energy Limited | Professional & scientific | 2012 |
| Brinded Property Investment Limited | Real estate | 2012 |
| Brindle Lane Limited | Real estate | 2018 |
| Bring ME the Maximum Limited | Wholesale & retail | 2023 |
| Britech Services Ltd | Other services | 2024 |
| British Classic Wire Wheels Limited | Professional & scientific | 1996 |
| Bro.Fin.Med. Ltd | Financial services | 2021 |
| Broad Oak Support Services Limited Liability Partnership | | 2008 |
| Broadfield Advisory Limited | Professional & scientific | 2025 |
| Broadleaf Place (Caterham) Management Company Limited | Households | 2021 |
| Brockenhurst Park Estate LLP | | 2021 |
| Brookville Property (Binfield) Ltd | Real estate | 2025 |
| Brookwood Studios Limited | Professional & scientific | 2014 |
| Brothers Wines Limited | Hospitality | 2012 |
| Brownswood Place (Beaconsfield) Management Company Limited | Households | 2009 |
| Brownswood Road Management Company Limited | Households | 2007 |
| Bruce M Thomson Holdings Ltd | Real estate | 1995 |
| Brunobear Ltd | Arts & recreation | 2023 |
| Btechlaboratories (UK) Ltd. | Manufacturing | 2017 |
| Bubblejam Limited | Other services | 2008 |
| Buchanan Dean Design Ltd | Professional & scientific | 1998 |
| Buckingham Property Developments LLP | | 2020 |
| Buckinghamshire Construction & Interiors Limited | Construction | 2018 |
| Bucks Cleaning Ltd | Administrative & support | 2021 |
| Bucks Hairdressing IT Consultancy Limited | Other services | 2022 |
| Bucks Higher Studies Limited | Education | 2020 |
| Bucks Recording Studios Ltd | Information & communication | 2026 |
| Buildback Consulting Ltd | Professional & scientific | 2020 |
| Built From Within Ltd | Information & communication | 2026 |
| Bunhill Fitness Limited | Arts & recreation | 2025 |
| Burbank Properties Ltd | Real estate | 1996 |
| Burhou Investment Ltd | Real estate | 2017 |
| Burlington International Limited | Professional & scientific | 2008 |
| Business Bookkeeping Support Ltd | Professional & scientific | 2023 |
| Business Change Tools Limited | Information & communication | 2011 |
| Business to Business Internet Limited | Extraterritorial | 2004 |
| Button Linguard Ltd | Construction | 2021 |
| Buzz Beds Limited | Professional & scientific | 2012 |
| BY George Garden Care Ltd | Administrative & support | 2023 |
| C & D Rigging Equipment Limited | Administrative & support | 1994 |
| C B Land Limited | Financial services | 2025 |
| C S Media Limited | Information & communication | 1997 |
| C&Dp Investments Limited | Professional & scientific | 2022 |
| C&O INNOV8 Consulting Limited | Professional & scientific | 2018 |
| Cable ROO Ltd | Professional & scientific | 2020 |
| Cadogan Property Management Ltd | Real estate | 2021 |
| Cake Communications Ltd | Administrative & support | 2008 |
| Cake-Lakes Ltd | Real estate | 2021 |
| Cake-Lets Ltd | Real estate | 2021 |
| Cakes by Kiran Ltd | Manufacturing | 2017 |
| CAL Arch Ltd | Professional & scientific | 2014 |
| Calathea IP Ltd | Professional & scientific | 2024 |
| Caledon Road Investments Limited | Real estate | 2003 |
| Callcott Holdings Limited | Construction | 1964 |
| Callingham Place Management Company Limited | Households | 2004 |
| Calliope Holdings Limited | Professional & scientific | 2022 |
| Calmac Portfolio Limited | Real estate | 2003 |
| Camertown Timber Merchants Limited | Wholesale & retail | 1994 |
| Camestone Consulting Ltd | Professional & scientific | 2021 |
| Camina Limited | Real estate | 2002 |
| Campion Willcocks Limited | Professional & scientific | 1968 |
| Camrose Management Limited | Professional & scientific | 2015 |
| Camswell Consultancy Limited | Professional & scientific | 2015 |
| Cana Property LLP | | 2024 |
| Canon House Clinic Ltd. | Health & social care | 2018 |
| Canonbie Finance Limited | Professional & scientific | 2021 |
| Canonbie Limited | Professional & scientific | 2021 |
| Canville Limited | Transport & logistics | 1992 |
| Capacity Bookings Ltd | Professional & scientific | 2026 |
| Capital Forest Products Limited | Construction | 1990 |
| Capitalcrest Ventures Ltd | Real estate | 2025 |
| Carbonandme Ltd | Professional & scientific | 2021 |
| Cardain Partners LLP | | 2014 |
| Cardiascreen Limited | Professional & scientific | 2010 |
| Care.Choice. Connect LLP | | 2024 |
| Carhuna Limited | Information & communication | 2022 |
| Carlton Villas Residents Management Company Limited | Households | 2010 |
| Carnica Consulting Limited | Professional & scientific | 2025 |
| Cartledge Consulting Limited | Information & communication | 2009 |
| Casa SAN Damian Limited | Real estate | 2015 |