| Buyer Connect Limited | Information & communication | 2020 |
| Buzz Cutz Dog Grooming Ltd | Other services | 2024 |
| Buzz Radar Limited | Information & communication | 2000 |
| Buzznow Limited | Wholesale & retail | 2026 |
| BVS Development & Construction Ltd | Construction | 2023 |
| BW Props Ltd | Professional & scientific | 2026 |
| BW Vehicle Group Ltd | Wholesale & retail | 2024 |
| BWL (Racing) Invest Limited | Extraterritorial | 1983 |
| BWS Building & Waste Services Limited | Water & waste | 2023 |
| BWT UK Limited | Manufacturing | 1978 |
| BY HKD Ltd | Other services | 2024 |
| BY HKG Ltd | Other services | 2024 |
| Byamar Limited | Transport & logistics | 2019 |
| Bynoe Knights Ltd. | Administrative & support | 2014 |
| Byrcrest Limited | Administrative & support | 2002 |
| Byron Funds Consulting Ltd | Mining & quarrying | 2008 |
| Bysingwood Group Limited | Professional & scientific | 1986 |
| Bysingwood Investments Limited | Real estate | 1995 |
| Byteful Limited | Information & communication | 2019 |
| Byword Business Services Limited | Administrative & support | 2018 |
| Byword for Wellbeing Ltd | Administrative & support | 2025 |
| C & M Serviced Properties Ltd | Real estate | 2025 |
| C & N Electrical Industries Limited | Manufacturing | 1958 |
| C Barker Limited | Construction | 2003 |
| C C Garden Rooms Ltd | Construction | 2024 |
| C J Equestrian Limited | Agriculture & fishing | 2023 |
| C L Jennings Ltd | Information & communication | 2023 |
| C L Whatman Ltd | Administrative & support | 2019 |
| C M Builder Services Limited | Construction | 2016 |
| C Phillips Consulting Ltd. | Professional & scientific | 2017 |
| C R Carpentry & Joinery Ltd | Construction | 2016 |
| C S Auto Clinic Ltd | Manufacturing | 2006 |
| C S Passive Fire Consultancy Ltd | Construction | 2025 |
| C S Towersey Limited | Administrative & support | 2006 |
| C Slevin Ltd | Administrative & support | 2025 |
| C Wade Ltd | Education | 2024 |
| C&L Homecare Ltd | Health & social care | 2025 |
| C&P Care Services Ltd | Health & social care | 2025 |
| C&W Carpentry Ltd | Construction | 2023 |
| C-Major Limited | Manufacturing | 2005 |
| C. Dowdy (Contractor) Limited | Construction | 2002 |
| C. Lawrence Upholstery Ltd | Manufacturing | 2008 |
| C.A.A Transport Ltd | Transport & logistics | 2026 |
| C.E.S. - Hire Limited | Administrative & support | 1982 |
| C2 Motors Ltd | Wholesale & retail | 2014 |
| C45 Investments Ltd | Real estate | 2023 |
| Caab Ltd | Professional & scientific | 2004 |
| Cable Splice Test Limited | Information & communication | 2022 |
| Cable Terminology Ltd | Manufacturing | 2006 |
| Cadfast Services Limited | Professional & scientific | 2005 |
| Cafe Ceylon Ltd | Hospitality | 2022 |
| Cagex (Aquatics) Limited | Extraterritorial | 1972 |
| Cagex Accessories Limited | Wholesale & retail | 1959 |
| Caine Décor Limited | Extraterritorial | 2018 |
| Caipirao Ltd | Hospitality | 2024 |
| Caipirao Steakhouse Ltd | Hospitality | 2024 |
| Cake ME Home Ltd | Other services | 2019 |
| Calabria Properties Management Limited | Real estate | 2021 |
| Calculo Tax Audit Limited | Professional & scientific | 2024 |
| Caleb Communications Ltd | Professional & scientific | 2026 |
| Calibre Gardens Limited | Agriculture & fishing | 2022 |
| Calibre Relocations Limited | Hospitality | 2022 |
| California TAN 2 Ltd | Other services | 2022 |
| Callaway RTM Company Limited | Hospitality | 2023 |
| Callum Mcintyre Limited | Information & communication | 2022 |
| Callwise Ltd | Information & communication | 2003 |
| Callwise Properties Limited | Professional & scientific | 2016 |
| Camera-Graphic Limited | Administrative & support | 1975 |
| Camfire Protection Limited | Manufacturing | 2009 |
| Campbell Howard-Spink Media Limited | Information & communication | 2013 |
| Campbell Prime Living Ltd | Real estate | 2025 |
| Campbellsutherland Crisis Leadership Limited | Professional & scientific | 2025 |
| Camtown Ltd | Arts & recreation | 2022 |
| Candid Care Ltd | Extraterritorial | 2021 |
| Candlecalm Ltd | Wholesale & retail | 2020 |
| Candlemakers (TW) Limited | Real estate | 2002 |
| Candy Fitness Ltd | Arts & recreation | 2014 |
| Cannon Catalyst Capital Ltd | Administrative & support | 2026 |
| Capilla Theory Ltd | Wholesale & retail | 2026 |
| Capital Outsource Limited | Administrative & support | 2014 |
| Capital Surfacing Limited | Extraterritorial | 2021 |
| Capri Education Ltd | Education | 2025 |
| Caprica Nelson Limited | Information & communication | 2008 |
| Capstore Holdings Limited | Wholesale & retail | 2013 |
| Caption Media Ltd | Wholesale & retail | 2020 |
| Captivo Ltd | Professional & scientific | 2017 |
| Capture Health Limited | Health & social care | 2015 |
| Car Care Cosmetics Limited | Wholesale & retail | 2016 |
| Car Grooming and Hire Ltd | Administrative & support | 2025 |
| Carbery (UK) Limited | Professional & scientific | 1998 |
| Carbkind Collective Ltd | Information & communication | 2025 |
| Cardace Limited | Professional & scientific | 2011 |
| Cardamom Garden Ltd | Real estate | 2026 |
| Cardocs HW Ltd | Wholesale & retail | 2026 |
| Cardocs Sales Ltd | Wholesale & retail | 2026 |
| Care and Companions Ltd | Other services | 2021 |
| Care at Your Home Ltd | Public administration | 2020 |
| Care at Your Home: Psychological Services Ltd | Health & social care | 2024 |
| Care for Independence Ltd | Health & social care | 2016 |
| CARE24/7UK Ltd | Health & social care | 2022 |