| BLS Energy Limited | Energy | 2023 |
| Blue Orchids Films Ltd | Arts & recreation | 2022 |
| Blue Sapphire International Limited | Wholesale & retail | 2019 |
| Blueberry Vale Limited | Households | 1999 |
| Bluenote Studio Ltd | Information & communication | 2016 |
| Blujo Ltd | Health & social care | 2025 |
| BM Siady Limited | Other services | 2017 |
| Bmilse Ltd | Wholesale & retail | 2025 |
| Bobi's Magic Snax Ltd | Hospitality | 2007 |
| Bohong Business Ltd | Extraterritorial | 2022 |
| Bolcasini Limited | Wholesale & retail | 2023 |
| Bombay Ruba Restaurant Ltd | Hospitality | 2018 |
| Bond Associates Limited | Professional & scientific | 1999 |
| Bornipete Limited | Health & social care | 2013 |
| BR E Bikes Limited | Wholesale & retail | 2024 |
| BR Etracker Ltd | Information & communication | 2025 |
| Braai Army Ltd | Wholesale & retail | 2024 |
| Braai Nation Travel Ltd | Administrative & support | 2021 |
| Braisha Limited | Health & social care | 2016 |
| Branded by YOU Ltd | Manufacturing | 2023 |
| Break Thru Productions Limited | Arts & recreation | 2007 |
| Brett Freeman Copywriting Limited | Administrative & support | 2022 |
| Brew Good Limited | Wholesale & retail | 2026 |
| Briardale Road G & S Ltd | Wholesale & retail | 2020 |
| Brick Image Limited | Construction | 2000 |
| Brick&Soil Ltd | Construction | 2024 |
| Brickfield Builders Ltd | Construction | 2025 |
| Brickfield Contractors London Limited | Construction | 2023 |
| Bright Minds EDU LLP | | 2022 |
| Brightagile Limited | Information & communication | 2021 |
| Brilliant Interiors Ltd | Construction | 2021 |
| Britannia Glass & Glazing Ltd | Construction | 1999 |
| Britkong Operator Limited | Transport & logistics | 2024 |
| Britkong Private Hire Car Limited | Transport & logistics | 2022 |
| Brizy Technologies Ltd | Information & communication | 2024 |
| Brookflow Limited | Wholesale & retail | 1997 |
| BRW Asset Management Ltd | Administrative & support | 2007 |
| Bryn Community Store Ltd | Wholesale & retail | 2017 |
| Bubbles Hair Boutique Ltd | Other services | 2025 |
| Build & Renovate BM Ltd | Construction | 2024 |
| Buildon Loft Conversions Ltd | Construction | 2015 |
| Buildwise Solutions Limited | Construction | 2023 |
| Bullitt Films Limited | Information & communication | 1998 |
| Bumar Gardens Limited | Administrative & support | 2017 |
| Burac Ltd | Construction | 2022 |
| Business Aspect Limited | Administrative & support | 2005 |
| Busy Bees After School Club Limited | Professional & scientific | 2009 |
| Buy the Book Ltd | Wholesale & retail | 2010 |
| Buy-Ao 24 HRS Shop Ltd | Wholesale & retail | 2025 |
| BYP Ltd | Wholesale & retail | 2025 |
| Bytewave Limited | Information & communication | 2024 |
| C & B Stores Ltd | Wholesale & retail | 2026 |
| C S Services (London) Ltd | Administrative & support | 2017 |
| C&E Management Limited | Financial services | 2020 |
| C. R. (Croydon) Management Company Limited | Administrative & support | 1986 |
| CAM Electrical Limited | Energy | 2018 |
| CAP Production Solutions Limited | Arts & recreation | 2003 |
| Capital Gateway 617 Solutions Limited | Professional & scientific | 2026 |
| Capital Property Lettings Ltd | Real estate | 2011 |
| Capitan House Limited | Real estate | 2022 |
| Capsag Consulting Services UK Limited | Professional & scientific | 2017 |
| Care Solutions UK Academy Limited | Education | 2024 |
| Carechange Ltd | Administrative & support | 2019 |
| Career Catalyzer Ltd | Education | 2024 |
| Caring Heart London Ltd | Health & social care | 2025 |
| Carlton Dental Ltd | Health & social care | 2008 |
| Caroline Keyzor Design Limited | Professional & scientific | 2017 |
| Carrington Coaching and Training Ltd | Education | 2024 |
| Carshalton Artists Ltd | Administrative & support | 2026 |
| Carshalton Athletic F.C. Limited | Arts & recreation | 2004 |
| Carshalton Boys Sports College | Education | 2011 |
| Carshalton Cleaners Ltd | Administrative & support | 2024 |
| Carshalton Counselling and Psychoanalysis Limited | Professional & scientific | 2015 |
| Carshalton Legal Services Ltd | Professional & scientific | 2026 |
| Carshalton Spice Ltd | Hospitality | 2023 |
| Casabelle Limited | Real estate | 2023 |
| Cashflow Enterprises Ltd | Financial services | 2024 |
| Caskets Limited | Wholesale & retail | 2002 |
| Cassiopeia Globals Ltd | Manufacturing | 2025 |
| Catalinvoinea Limited | Construction | 2017 |
| Catherine Hamilton Therapeutic Services Ltd | Health & social care | 2022 |
| CC Fight Factory CIC | Arts & recreation | 2026 |
| CCB Interiors Limited | Construction | 2024 |
| CED Zodiac Limited | Professional & scientific | 2021 |
| Cedar Close Property Management Limited | Real estate | 2013 |
| Cedrik Tiling Ltd | Construction | 2022 |
| CEH Off-Licence Ltd | Wholesale & retail | 2021 |
| Celbol Enterprise Limited | Financial services | 2016 |
| Census-Q Limited | Professional & scientific | 2011 |
| Central Brasil Exterior Ltd | Administrative & support | 2025 |
| Cezary Poltorak Ltd | Professional & scientific | 2012 |
| CGD Accountants Limited | Professional & scientific | 2020 |
| Charged London Ltd | Construction | 2021 |
| Charis Kleaners Ltd | Administrative & support | 2024 |
| Charja Electrical Services Limited | Construction | 2014 |
| Cheam Priory Day Centre Ltd | Health & social care | 2008 |
| Chelsea Barbershop Ltd | Other services | 2026 |
| Chenash Cleaners Ltd | Households | 2017 |
| Chenash Homecare Specialists Ltd | Health & social care | 2017 |
| Chenash Residences Ltd | Real estate | 2024 |