| BOD Activewear Ltd | Wholesale & retail | 2022 |
| Bodminplan Limited | Construction | 1983 |
| Body Swing Solution Ltd | Arts & recreation | 2021 |
| Bogie Properties Limited | Real estate | 2018 |
| Bonds Associates Limited | Real estate | 1963 |
| Boom Boxing Limited | Professional & scientific | 2017 |
| Borehamwood Propco Limited | Real estate | 2016 |
| Brackenhurst Healthcare Ltd | Extraterritorial | 2011 |
| Bradman & Co. Limited | Real estate | 1990 |
| Bramber Properties Limited | Real estate | 1950 |
| Brandznew Services Ltd | Administrative & support | 2025 |
| Brazilian Tours and Transfers Ltd | Administrative & support | 2023 |
| Brett Robertson Lees Limited | Administrative & support | 2009 |
| Brickfield Mews Management Company Limited | Extraterritorial | 2013 |
| Bridgecrown Limited | Other services | 2025 |
| Bright Intervals Limited | Professional & scientific | 2011 |
| Broadlands Management Company (Radlett) Limited | Real estate | 2001 |
| Brockley Hill Bakery Limited | Hospitality | 2023 |
| Brook Drive Residents Limited | Households | 2008 |
| Brookline Strategy Limited | Professional & scientific | 2018 |
| Broomcroft Investments (NO.2) Limited | Professional & scientific | 2024 |
| Brownlow Court Management Company Limited | Households | 1991 |
| Bugsy's Home Ltd | Real estate | 2023 |
| Build LET LLP | | 2010 |
| Building Partners Limited | Administrative & support | 2004 |
| Built Different Ventures Ltd | Professional & scientific | 2026 |
| Bumsy Investment Company Limited | Real estate | 2021 |
| Burdon Ltd | Professional & scientific | 2018 |
| Burgess Developments Holdings Limited | Financial services | 2018 |
| Burgess Property Projects Ltd | Extraterritorial | 2018 |
| Business Families Dynamics Ltd | Administrative & support | 2017 |
| BY Jodie Travel Limited | Administrative & support | 2024 |
| Byerley Property Investments Limited | Real estate | 2016 |
| C & a Master Builders Limited | Construction | 2025 |
| C&S Plumbing Ltd | Construction | 2021 |
| C.A.N.D.L.E Properties Partnership LLP | | 2009 |
| C.A.N.D.L.E. Properties Limited | Extraterritorial | 2007 |
| C.K. Health & Beauty Limited | Professional & scientific | 1999 |
| C4MK (TL) Limited | Professional & scientific | 2025 |
| C4MK Limited | Professional & scientific | 2017 |
| Cafeoz Ltd | Hospitality | 2026 |
| Cahn Aroma Therapy Limited | Manufacturing | 2007 |
| Calash Investments Limited | Information & communication | 2002 |
| California Sunset Limited | Wholesale & retail | 2023 |
| Canons Property Limited | Financial services | 2024 |
| Cappy Consulting Ltd | Professional & scientific | 2023 |
| Caraddiction Detailing Limited | Wholesale & retail | 2025 |
| Caraeno Estates Limited | Real estate | 2024 |
| Caretax Ltd | Professional & scientific | 2021 |
| Carly Gray Production Limited | Professional & scientific | 2014 |
| Caroline Amanda Mansfield Limited | Extraterritorial | 2021 |
| Caroline Amanda Russ Limited | Extraterritorial | 2021 |
| Cary Radiology Services Ltd | Health & social care | 2025 |
| Casae Limited | Other services | 2016 |
| Catalyst Career Coaching Limited | Professional & scientific | 2026 |
| Cativa Ltd | Professional & scientific | 2021 |
| CAV & Amara Investments Limited | Real estate | 2021 |
| Cayman Devlin Limited | Information & communication | 2011 |
| Celsius Financial Services Limited | Administrative & support | 2003 |
| Central London Property Consulting Ltd | Real estate | 2021 |
| Central London Property Investments LLP | | 2005 |
| Centre Point Flooring Ltd | Construction | 2024 |
| Cerium Holdings Limited | Financial services | 2020 |
| CH2MEDIA Ltd | Professional & scientific | 2024 |
| Chaii Coffee Franchise Ltd | Hospitality | 2024 |
| Chaii Coffee Ltd | Hospitality | 2024 |
| Change Mechanics Limited | Professional & scientific | 2012 |
| Change of State Limited | Professional & scientific | 2020 |
| Channing & Partners Ltd | Professional & scientific | 2019 |
| Char Properties Limited | Real estate | 2024 |
| Charis Global Solutions Ltd | Transport & logistics | 2025 |
| Charles Birshaw Ltd | Professional & scientific | 2022 |
| Chase Debt Limited | Administrative & support | 2010 |
| Checkinout Inventories Limited | Real estate | 2005 |
| Chesil Way RTM Company Limited | Households | 2009 |
| Chiltern Wood Products Limited | Manufacturing | 2015 |
| Cholmeley Grange Management Company Limited | Households | 1994 |
| Chreb BKT Ltd | Administrative & support | 2025 |
| Christchurch Consultants Ltd | Information & communication | 2016 |
| Chynowen Consulting Limited | Professional & scientific | 2025 |
| CI Partners Limited | Professional & scientific | 2024 |
| Cipmarius Delivery Ltd | Transport & logistics | 2023 |
| Circle App Ltd | Professional & scientific | 2025 |
| Circle Place Limited | Professional & scientific | 2006 |
| Citesure Ltd | Information & communication | 2025 |
| City Accounting Ltd | Professional & scientific | 2026 |
| City Logistiks Ltd | Other services | 2022 |
| City Road Estates Limited | Real estate | 2003 |
| City Suburbia Ltd | Professional & scientific | 2020 |
| City Wharf Management Co Limited | Households | 2005 |
| CJ Rise Limited | Professional & scientific | 2025 |
| CK & D Consulting Limited | Professional & scientific | 2014 |
| Clandestine Capital Ltd | Wholesale & retail | 2024 |
| Classio Limited | Transport & logistics | 2021 |
| Clay Legal Ltd | Professional & scientific | 2017 |
| Clean the City Ltd | Other services | 2019 |
| Clerys Clock Ltd | Hospitality | 2014 |
| Click 4 Clothing Collection Ltd | Wholesale & retail | 2021 |
| Clinic Pro Digital Ltd | Information & communication | 2026 |
| Club Ralph Limited | Information & communication | 2014 |