| Bubblegum Frangipani Holdings | Financial services | 2019 |
| Bucklebeats Ltd | Professional & scientific | 2023 |
| Bucklers Hard Productions Ltd | Arts & recreation | 2019 |
| Buckley & Barker Consulting & Development Ltd | Administrative & support | 2011 |
| Buckley Business Services Limited | Professional & scientific | 2011 |
| Budwood Limited | Health & social care | 2018 |
| Buen International Ltd | Wholesale & retail | 2023 |
| Build 25 Ltd | Construction | 2025 |
| Build My RIG (BMR) Limited | Wholesale & retail | 2026 |
| Built by Brett Ltd | Other services | 2025 |
| Built for HR Limited | Administrative & support | 2023 |
| Bulk Flow Ltd | Wholesale & retail | 2025 |
| Bull 99 Ltd | Transport & logistics | 2021 |
| Bullseye Electrical Engineering Ltd | Construction | 2026 |
| Bumble Hole Eggs Limited | Manufacturing | 1973 |
| Bundred & Goode Limited | Professional & scientific | 1991 |
| Burrows Digital Consultants Ltd | Information & communication | 2003 |
| Business AI Agency Ltd | Information & communication | 2025 |
| Business Alchymie Ltd | Professional & scientific | 2022 |
| Business Consultancy 365 Limited | Professional & scientific | 2022 |
| Business Energy Redress Ltd | Financial services | 2023 |
| Business Management Systems Ltd | Administrative & support | 2015 |
| Businessynergy Holdings Limited | Financial services | 2025 |
| Businessynergy Limited | Administrative & support | 2003 |
| Butchers Block Bromsgrove Limited | Hospitality | 2022 |
| Butler Property Investments Ltd | Real estate | 2015 |
| BVH Limited | Administrative & support | 2015 |
| Byron 1962 Limited | Extraterritorial | 2014 |
| Byron Benirras Limited | Arts & recreation | 2018 |
| Bytronic Automation Limited | Manufacturing | 1997 |
| C & a Company Secretarial Services Limited | Extraterritorial | 2009 |
| C & C Waste Management (UK) Ltd | Water & waste | 2020 |
| C & M Multi Services Ltd | Construction | 2023 |
| C & R Contracts Holdings Limited | Real estate | 2021 |
| C & R Contracts Limited | Administrative & support | 2007 |
| C a Fabrications Limited | Manufacturing | 2013 |
| C a Rendering Services Ltd | Construction | 2013 |
| C B Hall (Independent Financial Adviser) Limited | Financial services | 2019 |
| C D G Carpentry Limited | Construction | 2007 |
| C Finnerty Brickwork Ltd | Construction | 2022 |
| C Lowe Holdings Ltd | Administrative & support | 2023 |
| C N C Technology Limited | Manufacturing | 2009 |
| C P a Recruitment Limited | Administrative & support | 2004 |
| C P Development Building Services Limited | Construction | 2025 |
| C-Gull LLP | | 2018 |
| C.E. Partridge & SON Limited | Wholesale & retail | 1978 |
| C.F.T. Trading Company Limited | Health & social care | 1993 |
| C.J. Plant & Equipment Limited | Wholesale & retail | 2015 |
| C.J.Plant Group Limited | Professional & scientific | 2006 |
| C2 Promotions Limited | Other services | 1993 |
| CA4 Limited | Professional & scientific | 2007 |
| Caaj Sports Limited | Arts & recreation | 2010 |
| CAD Facilities Management Limited | Administrative & support | 2002 |
| Cadell Sportswear Limited | Manufacturing | 2017 |
| Cadent Limited | Manufacturing | 1991 |
| Cadonis Limited | Professional & scientific | 1998 |
| Cadsquare Midlands Limited | Professional & scientific | 2003 |
| Cadsquare South West Limited | Professional & scientific | 2003 |
| Caer Ridge Consulting Limited | Information & communication | 2017 |
| Caeruleum Consulting Limited | Professional & scientific | 2022 |
| Cagey Films Limited | Administrative & support | 2016 |
| Caib Rail Holdings Limited | Professional & scientific | 1956 |
| Caib UK Limited | Professional & scientific | 1988 |
| Cairstine & Co. | Real estate | 2013 |
| Calculators Tech Ltd | Education | 2025 |
| Caleigh Properties Limited | Real estate | 2020 |
| Calthorpe Surveyors Limited | Professional & scientific | 2002 |
| Calvey Construction Ltd | Construction | 2019 |
| Calvinoesque Limited | Professional & scientific | 2024 |
| Calztec Ltd | Administrative & support | 2014 |
| Camelot Insight LLP | | 2013 |
| Camera on Films Limited | Financial services | 2012 |
| Cameron Reacaro O’Leary Limited | Extraterritorial | 2025 |
| Camonets Limited | Wholesale & retail | 2009 |
| Campbell & Hughes Services Limited | Construction | 2010 |
| Cando GB Ltd | Extraterritorial | 2004 |
| Canine Massage Guild Limited | Administrative & support | 2013 |
| Canine Massage Therapy Centre Ltd | Administrative & support | 2006 |
| Canons Park Properties Limited | Real estate | 2001 |
| Canova Home and Fragrance Limited | Manufacturing | 2005 |
| Capital Construction Holdings Limited | Financial services | 2017 |
| Capital Tuition Group Birmingham Ltd | Education | 2026 |
| Capricorn Giveaways Ltd | Arts & recreation | 2025 |
| Capstone Consult Limited | Wholesale & retail | 2026 |
| Cara Gainer Golf Ltd | Arts & recreation | 2023 |
| Cardinal Holdings Ltd | Financial services | 2025 |
| Cardinal Steels Ltd | Manufacturing | 2020 |
| Care Group Northwest Ltd | Health & social care | 2025 |
| CARE4FUTURES Limited | Manufacturing | 2016 |
| Carenza Clobber Limited | Wholesale & retail | 2006 |
| Carl Glenn O’Leary Limited | Professional & scientific | 2022 |
| Carl Harvey Consulting Limited | Professional & scientific | 2024 |
| Carl O'Leary Limited | Financial services | 2022 |
| Carney Consulting Services Limited | Information & communication | 2006 |
| Carolus Partnership LLP | | 2015 |
| Carsino Ltd | Wholesale & retail | 2025 |
| Carter Esquire Limited | Wholesale & retail | 2017 |
| Cartlidge Ltd | Real estate | 2023 |
| Carvin Facilities Limited | Administrative & support | 2020 |
| CAS Technology Ltd | Administrative & support | 2020 |