| Cree Care Services Ltd | Health & social care | 2022 |
| Creeland Mews Limited | Construction | 2023 |
| Creeper Cocktails Ltd | Hospitality | 2021 |
| Crem Kitchen Ltd | Hospitality | 2012 |
| Crem Labs Ltd | Financial services | 2021 |
| Crescent Creative Ltd | Professional & scientific | 2025 |
| Crescent Furniture Ltd | Wholesale & retail | 2017 |
| Crest Bespoke Joinery Ltd | Manufacturing | 2026 |
| Crest Maze Ltd | Hospitality | 2018 |
| Cresta Homes Hoddesdon 1635 Limited | Construction | 2010 |
| Crestview Services Limited | Information & communication | 2025 |
| Crewmate Recruitment Ltd | Administrative & support | 2025 |
| CRF London Limited | Real estate | 2017 |
| Cricvo Ltd | Wholesale & retail | 2023 |
| Crimson Decants Ltd | Wholesale & retail | 2024 |
| Crimson Lotus Holdings Ltd | Financial services | 2025 |
| Cris and Mari Ltd | Construction | 2015 |
| Crissa Limited | Construction | 2025 |
| Cristera Ltd | Administrative & support | 2020 |
| Cristian Horhocea Limited | Transport & logistics | 2015 |
| Cristian MD Ltd | Construction | 2025 |
| Cristian Painting Ltd | Construction | 2017 |
| Cristian&Dumitru Ltd | Construction | 2022 |
| Cristina's Cafe Ltd | Hospitality | 2024 |
| Criterion Group Limited | Professional & scientific | 1987 |
| Critical Maintenance Ltd | Extraterritorial | 2014 |
| CRK IT Services Limited | Information & communication | 2019 |
| Croatia Lima Ltd | Wholesale & retail | 2026 |
| Croi Building Ltd | Construction | 2026 |
| Croi Construction Ltd | Construction | 2019 |
| Cromwells Mere Havering Road Residents Association Limited | Households | 1997 |
| Crooners - the Show Limited | Extraterritorial | 2005 |
| Crosby Estates Limited | Real estate | 2020 |
| Crosby Property Investments Ltd | Real estate | 2016 |
| Cross Decor Ltd | Construction | 2025 |
| Cross N Gym Limited | Information & communication | 2025 |
| Cross Platform Ltd | Information & communication | 2018 |
| Cross Purposes Complete Physio and Fitness Limited | Arts & recreation | 2006 |
| Cross Purposes Properties Limited | Construction | 2006 |
| Crossed Paths Ltd | Information & communication | 2023 |
| Crossport Commerce Ltd | Wholesale & retail | 2026 |
| Crossways Business Solutions Limited | Professional & scientific | 2022 |
| Crossways Care (UK) Limited | Health & social care | 2009 |
| Crow Lane Autos Ltd | Administrative & support | 2017 |
| Crowlands Driving School Ltd | Extraterritorial | 2004 |
| Crowlands Limited | Extraterritorial | 2009 |
| Crowlands Postal Service Limited | Wholesale & retail | 2025 |
| Crown Bridge Trading UK Ltd | Wholesale & retail | 2025 |
| Crown Financial Ltd | Financial services | 2021 |
| Crown Fresh Fruit and Vegetables Limited | Wholesale & retail | 2026 |
| Crown House Administration Limited | Households | 2002 |
| Crown House Clerk of Works Limited | Professional & scientific | 2019 |
| Crown Ingredients Limited | Wholesale & retail | 2025 |
| Crown Landmarks Limited | Real estate | 2024 |
| Crown Promotions and Removals Ltd. | Administrative & support | 2000 |
| Crown Shopfronts & Shutters Limited | Construction | 2020 |
| Crown Transport Couriers Ltd | Transport & logistics | 2024 |
| Crown Valor Ltd | Wholesale & retail | 2026 |
| Crowned Bookkeepers Ltd | Professional & scientific | 2024 |
| Crowned Nexus Ltd | Real estate | 2025 |
| Crownstar Constructions Limited | Construction | 1993 |
| Crownstone Gallery Limited | Wholesale & retail | 2025 |
| CRS Fashion Limited | Manufacturing | 2025 |
| CRT Group Limited | Construction | 2017 |
| Cruisecopy Sales Limited | Professional & scientific | 2026 |
| Cruroig Ltd | Other services | 2024 |
| Crusader Door Systems Limited | Construction | 1997 |
| Crusader Health & Safety Consulting Limited | Administrative & support | 2011 |
| Crusen Ltd | Administrative & support | 2026 |
| Crutasevschi Ltd | Construction | 2024 |
| Crypto DR Ltd | Transport & logistics | 2019 |
| Cryptoknight Recruitment Ltd | Administrative & support | 2022 |
| Cryptrans Limited | Financial services | 2025 |
| Crystal City Ltd | Administrative & support | 2018 |
| Crystal Cleaning and Support Services Ltd | Administrative & support | 2023 |
| Crystal Cosmetics (UK) Ltd | Wholesale & retail | 2010 |
| Crystal Driveways & Landscapes Ltd | Construction | 2017 |
| Crystal Energy Ltd | Administrative & support | 2013 |
| Crystal Essence Limited | Wholesale & retail | 2025 |
| Crystal Group Limited | Manufacturing | 2005 |
| Crystal Heating & Cooling Ltd | Construction | 2025 |
| Crystal Home Improvements Group Limited | Manufacturing | 2002 |
| Crystal Home Improvements Holdings Limited | Manufacturing | 2003 |
| Crystal J Homes Ltd | Real estate | 2025 |
| Crystal Point Consulting Limited | Professional & scientific | 2012 |
| Crystal Point Property Ltd | Real estate | 2023 |
| Crystal Quant Ltd | Professional & scientific | 2023 |
| Crystal Resources (UK) Limited | Other services | 2013 |
| Crystal Town Ltd | Administrative & support | 2021 |
| Crystal Utilities Ltd | Other services | 2012 |
| Crystal Windows & Doors Limited | Manufacturing | 1995 |
| Crystaltech Services (UK) Limited | Administrative & support | 2004 |
| CS Automotive Vehicle Repair Ltd | Wholesale & retail | 2024 |
| CS Construction Services Ltd | Construction | 2015 |
| CS Floorfit Ltd | Manufacturing | 2024 |
| CS Property Services Group Ltd | Construction | 2025 |
| CSB Estates Ltd | Real estate | 2026 |
| CSD Consultancy Limited | Professional & scientific | 2023 |
| CSD Homes Limited | Real estate | 2023 |
| Csflooring Design Ltd | Construction | 2024 |