| Create Audio Visual Ltd | Administrative & support | 2024 |
| Create Solutions Projects Ltd | Construction | 2023 |
| Createlife Limited | Health & social care | 2010 |
| Creative Clinic Ltd | Professional & scientific | 2023 |
| Creative Cravings Ltd | Hospitality | 2021 |
| Creative EC Limited | Manufacturing | 2018 |
| Creative Global Solutions Limited | Information & communication | 2019 |
| Creative Health Coaching Ltd | Health & social care | 2011 |
| Creative Leadership Consultants Limited | Professional & scientific | 1989 |
| Creative Seed Communications Limited | Professional & scientific | 2013 |
| Creative Thirty One Ltd | Professional & scientific | 2024 |
| Creator Construction Ltd | Construction | 2014 |
| Creature of Habit Ltd | Wholesale & retail | 2021 |
| Credence Consultancy Services Limited | Information & communication | 2010 |
| Credence Grey Matter Revival Ltd | Health & social care | 2025 |
| Credit Limits Limited | Financial services | 1987 |
| Creed Productions Ltd | Information & communication | 2020 |
| Creighton Lane Limited | Real estate | 2024 |
| Crendon Farriers Limited | Agriculture & fishing | 2007 |
| Crescent Gardens Barley MOW Management Company Limited | Households | 2019 |
| Crescent Healthcare Ltd | Health & social care | 2024 |
| Creseada International Limited | Administrative & support | 2016 |
| Cressington Lodge Ltd | Real estate | 2012 |
| Crest Invest Limited | Administrative & support | 2022 |
| Crestable Investments Ltd | Real estate | 2023 |
| Crewcobra Limited | Financial services | 1998 |
| Crewlio Limited | Administrative & support | 2026 |
| Crews Hill Wholesale Plants Limited | Wholesale & retail | 2009 |
| Cricfig Limited | Administrative & support | 2018 |
| Cricket Station Limited | Wholesale & retail | 2021 |
| Crimson Home Repair Ltd | Administrative & support | 2026 |
| Criptic Music Limited | Information & communication | 2005 |
| Cris Services (UK) Ltd | Transport & logistics | 2019 |
| Cris Services Group Limited | Transport & logistics | 2012 |
| Cris Services Properties Limited | Real estate | 2025 |
| Crisis Communications Audits Ltd | Professional & scientific | 2024 |
| Criterion (Hadley Wood) Management Company Limited | Households | 2019 |
| Critical Care Medicine Limited | Health & social care | 2013 |
| Critical Paths and Lines of Defence Limited | Professional & scientific | 2024 |
| Croft Valley Limited | Other services | 2006 |
| Crofton Estates Ltd | Real estate | 2021 |
| Cromer Road Management Co. Limited | Real estate | 1984 |
| Cromwell Suites Ltd | Households | 1997 |
| Cronin Mcgill Investments Ltd | Real estate | 2024 |
| Cronin Mcgill Ltd | Real estate | 2021 |
| Cronin Property Group Ltd | Real estate | 2026 |
| Cronks One Ltd | Real estate | 2016 |
| Cronnis Limited | Wholesale & retail | 2024 |
| Cronos Consultancy Ltd | Professional & scientific | 2021 |
| Crooked House Films Limited | Information & communication | 2013 |
| Cropsell Limited | Manufacturing | 2021 |
| Crossborder Capital Domain Holdings Limited | Administrative & support | 2024 |
| Crossfit Watford Limited | Arts & recreation | 2014 |
| Crown Build Contractors Ltd | Construction | 2026 |
| Crown Court (N10) RTM Company Limited | Real estate | 2015 |
| Crown Court Freehold Company Limited | Real estate | 2016 |
| Crown Green Mews Residents Management Company Limited | Households | 2008 |
| Crown Group Services Limited | Professional & scientific | 1993 |
| Crown Manor Limited | Real estate | 2024 |
| Crown Protection Services Limited | Administrative & support | 1993 |
| Crown View Strategic Limited | Professional & scientific | 2022 |
| Crownbrush Limited | Other services | 2011 |
| Crownstone Homes Ltd | Real estate | 2022 |
| Cruiser VFX Limited | Information & communication | 2017 |
| Cryptex 365 Ltd | Information & communication | 2023 |
| Crystal Carpet Cleaners Ltd | Administrative & support | 2016 |
| Crystal Engineers Limited | Real estate | 2006 |
| Crystal Photography UK Limited | Professional & scientific | 2009 |
| CS Fabrication Ltd | Professional & scientific | 2025 |
| Csat Marketing Ltd | Professional & scientific | 2022 |
| CSD Construction Ltd | Construction | 2015 |
| Csis UK Health Limited | Financial services | 2021 |
| CSM Systems Ltd | Information & communication | 2010 |
| Csscreative Limited | Extraterritorial | 2023 |
| Csweeney Consulting Ltd | Professional & scientific | 2023 |
| CTM Studio Limited | Professional & scientific | 2023 |
| Ctrlc Ctrlv Limited | Professional & scientific | 2018 |
| Cubae Ltd | Wholesale & retail | 2011 |
| Cube Living Limited | Hospitality | 2010 |
| Cubit Design & Building Ltd | Construction | 2017 |
| Cuffley Clinic Ltd | Health & social care | 2022 |
| Cula Consulting Limited | Administrative & support | 2019 |
| Culinaris UK Limited | Wholesale & retail | 2012 |
| Culinary Services UK Limited | Hospitality | 2013 |
| Culmore Limited | Transport & logistics | 2021 |
| Culture Labs Ltd | Information & communication | 2020 |
| Culture Smart! Limited | Administrative & support | 1996 |
| Cumberland Road Management Ltd | Real estate | 2025 |
| Cunningham & Emin Property Ltd | Real estate | 2017 |
| Cunningham & Partners Limited | Financial services | 2008 |
| CUP & Cino Greek Coffee and Bakery Limited | Wholesale & retail | 2023 |
| Curantis Care Services Ltd | Health & social care | 2024 |
| Curated Developments Limited | Professional & scientific | 2014 |
| Curl Collection Ltd | Wholesale & retail | 2022 |
| Curl CRU Limited | Administrative & support | 2025 |
| Curldo Limited | Wholesale & retail | 2020 |
| Current Electrics Ltd | Wholesale & retail | 2007 |
| Curry Leaf 7 Ltd | Hospitality | 2026 |
| Curtain Interiors Ltd | Administrative & support | 2015 |
| Curtis & Co UK Ltd | Real estate | 2017 |