| Carclo Holding Limited | Professional & scientific | 2002 |
| Carclo Investments Limited | Extraterritorial | 1925 |
| Carclo Overseas Holdings Limited | Professional & scientific | 1948 |
| Carclo PLC | Manufacturing | 1924 |
| Carclo Securities Limited | Extraterritorial | 1943 |
| Carclo Technical Plastics (Mitcham) Limited | Extraterritorial | 1984 |
| Carclo Technical Plastics (Slough) Limited | Extraterritorial | 1936 |
| Carclo Technical Plastics Limited | Manufacturing | 1995 |
| Carclo US Finance NO.2 | Professional & scientific | 2001 |
| Carclo Zephyr Limited | Extraterritorial | 1968 |
| Care Masters Send Support Ltd | Health & social care | 2025 |
| Caresecure Service Ltd | Administrative & support | 2025 |
| Caribbean Community Alliance Project CIC | Education | 2022 |
| Carisbrooke Markets Limited | Wholesale & retail | 2022 |
| Carlos Serrao Building Services Limited | Construction | 2006 |
| Carpentry and Construction EVO Limited | Construction | 2007 |
| Carpentry Easy Fit Ltd | Construction | 2025 |
| Carry Crew Limited | Transport & logistics | 2024 |
| Carry Crew Sovereign Limited | Transport & logistics | 2025 |
| Cars Junction Ltd | Wholesale & retail | 2018 |
| Carsity Limited | Wholesale & retail | 2023 |
| CAS Building Services Ltd | Construction | 2020 |
| Casa DE Oracion UK Ltd | Other services | 2020 |
| Casa DEL Flavour Ltd | Hospitality | 2024 |
| Casa E Progetti Limited | Construction | 2017 |
| Casa Spinola Capital Ltd | Financial services | 2025 |
| Case Construction Group Limited | Construction | 2015 |
| Caslin Trust Ltd | Hospitality | 2014 |
| Casmatic ( UK ) Ltd | Transport & logistics | 2020 |
| Catal Limited | Hospitality | 2024 |
| Catcherscomfortuk Ltd | Wholesale & retail | 2025 |
| Catchy Cart Limited | Wholesale & retail | 2024 |
| Catherine Skinner Enterprises Ltd | Education | 2024 |
| Caxton Recruiting Services Ltd | Health & social care | 1998 |
| CAZ Healthcare Ltd | Health & social care | 2023 |
| CBK Travels & Communications Ltd | Information & communication | 2015 |
| CCA Consultancy Ltd | Professional & scientific | 2025 |
| CCS TLM Limited | Administrative & support | 2010 |
| Cececa Ltd | Professional & scientific | 2012 |
| Cecil Group Ltd | Administrative & support | 2025 |
| Cedar Grove Homes Ltd | Real estate | 2022 |
| Cedars ( London ) Ltd | Wholesale & retail | 2015 |
| Celebrating Architecture | Professional & scientific | 2020 |
| Celosia -RE Ltd | Manufacturing | 2021 |
| Cemfree Limited | Professional & scientific | 1991 |
| Centrale Residences Ltd | Real estate | 2025 |
| Cephas Properties Limited | Real estate | 2023 |
| Certia Engineering UK Ltd | Professional & scientific | 2013 |
| Certified Plumbing Ltd | Construction | 2020 |
| CFC Property Ltd | Real estate | 2017 |
| Champion Footcare Ltd | Health & social care | 2021 |
| Chan Investment Limited | Real estate | 2022 |
| Chan Sinh Properties Ltd | Real estate | 2020 |
| Chancery West Limited | Administrative & support | 2014 |
| Chansinhresaurants Ltd | Hospitality | 2021 |
| Chantelle OJO Fundraising Ltd | Professional & scientific | 2023 |
| Chapel Gates Construction Ltd | Construction | 2019 |
| Chapman Square Limited | Financial services | 2017 |
| Chapmans Springs Limited | Extraterritorial | 1954 |
| Charcoal Guys Ltd | Hospitality | 2018 |
| Charles Family Media Ltd | Manufacturing | 2026 |
| Charlie's Prestige Building Services Ltd | Construction | 2020 |
| Charway Group Ltd | Manufacturing | 2026 |
| Chatfield Property Ltd | Professional & scientific | 2001 |
| Chauffeur Chauffeur Ltd | Transport & logistics | 2015 |
| Check in Consultants Ltd | Professional & scientific | 2025 |
| Cheema Services International Ltd | Other services | 2020 |
| Cheers Hospitality Ltd | Hospitality | 2025 |
| Chef Erica's Kitchen Ltd | Extraterritorial | 2022 |
| Chelsea Skin Care Ltd | Health & social care | 2011 |
| Chelsea Trades London Ltd | Transport & logistics | 2024 |
| Chemistry Music Group Ltd | Information & communication | 2020 |
| Cherry Cedar Ltd | Hospitality | 2024 |
| Cheryl Claudette Griffith Limited | Extraterritorial | 2025 |
| Chessmead Court Residents Association Limited | Households | 1999 |
| Cheviot (London) Limited | Professional & scientific | 2012 |
| Cheviots Estate Limited | Households | 2008 |
| Chew’S Custom Cookies Limited | Wholesale & retail | 2025 |
| Chheena Logistics Ltd | Transport & logistics | 2026 |
| Chicken Bite (UK) Ltd | Extraterritorial | 2009 |
| Chicken World Peri Peri Ltd | Hospitality | 2018 |
| Chickys IPR Ltd | Hospitality | 2024 |
| Chillin 876 Restaurant Ltd | Hospitality | 2025 |
| China Garden Express Limited | Hospitality | 2023 |
| Chingchingching Ltd | Real estate | 2024 |
| Chithambara OSA International Ltd | Other services | 2015 |
| Chlgo Ltd | Transport & logistics | 2022 |
| Chogath Limited | Professional & scientific | 2024 |
| Chowwow Mart Ltd | Wholesale & retail | 2025 |
| Choyce David Consulting Ltd | Information & communication | 2011 |
| Chozen Generation Ltd | Professional & scientific | 2010 |
| Chris Building and Decoration Services Ltd | Construction | 2021 |
| Chrisanne Clover Limited | Manufacturing | 1986 |
| Chrisben Limited | Health & social care | 2015 |
| Chrisphill Ltd | Administrative & support | 2018 |
| Chrisrock Limited | Health & social care | 2025 |
| Christ Liberty Church Community Limited | Other services | 2025 |
| Christie Glass Limited | Manufacturing | 2007 |
| Ciphertronix Ltd | Information & communication | 2025 |
| Ciprianbortos Ltd | Transport & logistics | 2018 |