| Crisha Dwellings Ltd | Real estate | 2023 |
| Crisha Homes Ltd | Real estate | 2023 |
| Cristalmaxx Ltd | Wholesale & retail | 2022 |
| Cristel Time Ltd. | Information & communication | 1991 |
| Cristian B Limited | Administrative & support | 2018 |
| Cristybogdan Trans Ltd | Transport & logistics | 2019 |
| Critical Cleans Limited | Administrative & support | 2024 |
| Criticalis Ltd | Information & communication | 2015 |
| Criticalmat Supply Ltd | Wholesale & retail | 2025 |
| CRL Groundwork Services Ltd | Construction | 2022 |
| Croasdale Family House Ltd | Health & social care | 2021 |
| Crochetcreationz Ltd | Wholesale & retail | 2026 |
| Crocodile Property Limited | Real estate | 2024 |
| Croftos Limited | Real estate | 2001 |
| Croitoru Transport Limited | Transport & logistics | 2018 |
| Crompton Land & Development Ltd | Administrative & support | 2015 |
| Cromwell Place (Phase 2) Residents Management Company Limited | Households | 2024 |
| Cromwell Place Residents Management Company Limited | Households | 2022 |
| Cronhooks Ltd | Information & communication | 2023 |
| Crooked Cafe Limited | Hospitality | 2016 |
| Crop Holdings Limited | Financial services | 2014 |
| Cropped Ltd | Professional & scientific | 2022 |
| Croputils Ltd | Agriculture & fishing | 2025 |
| Crorica Ltd | Financial services | 2018 |
| Crosby Technical Services Limited | Professional & scientific | 2008 |
| Cross and Stable Charities(The) | Real estate | 1987 |
| Cross Country Properties Limited | Real estate | 1984 |
| Cross Keys Woolstone Limited | Hospitality | 2023 |
| Cross Talk Productions Ltd | Information & communication | 2024 |
| Crosseagle Care Services Ltd | Health & social care | 2016 |
| Crosseagle Support Ltd | Hospitality | 2025 |
| Crossmead Homes Limited | Households | 2024 |
| Crosspay Ltd | Financial services | 2015 |
| Crossroads Hydrotherapy Centre Limited | Professional & scientific | 2013 |
| Crotha Limited | Information & communication | 2015 |
| Crouch END Studio Limited | Arts & recreation | 2010 |
| Crovis Ltd | Health & social care | 2013 |
| Crowbush Limited | Real estate | 2017 |
| Crown & Oak Estates Ltd | Real estate | 2026 |
| Crown Accountancy Services Limited | Professional & scientific | 2018 |
| Crown Business Finance Limited | Financial services | 2019 |
| Crown Global Concepts Limited | Administrative & support | 2010 |
| Crown Law Services Limited | Professional & scientific | 2023 |
| Crown Realty Group Ltd | Real estate | 2024 |
| Crown Sales & Property Management Services Limited | Real estate | 2010 |
| Crown Travel (MK) Ltd | Transport & logistics | 2024 |
| Crown UK Services Limited | Construction | 2020 |
| Crowndale Limited | Real estate | 1989 |
| Crowned Essence Ltd | Other services | 2024 |
| Crownstar Motors Limited | Wholesale & retail | 2026 |
| Crowood Property Limited | Extraterritorial | 1997 |
| Crpj Property Investments Ltd | Real estate | 2017 |
| CRS Daniell Holdings Limited | Construction | 2024 |
| CRS Telemedicine Limited | Information & communication | 2013 |
| Crucial Formations Limited | Professional & scientific | 2012 |
| Crumbs by BEE Ltd | Hospitality | 2026 |
| Crump Mcready Ltd | Professional & scientific | 2026 |
| Cruncholicious Limited | Wholesale & retail | 2024 |
| Crusader (SR) Limited | Professional & scientific | 2015 |
| Cruser Ltd | Construction | 2018 |
| Crux AI Ltd. | Information & communication | 2019 |
| Cruz Y Sainz Ltd | Real estate | 2018 |
| CRV Control Systems Limited | Manufacturing | 2014 |
| CRV Properties (MK) Ltd | Real estate | 2023 |
| Cryochaps Limited | Arts & recreation | 2017 |
| Cryofuel Tank Systems Ltd | Other services | 2016 |
| Cryogenic Workwear Limited | Wholesale & retail | 2004 |
| Crystal Brick Limited | Construction | 2020 |
| Crystal Care MK Limited | Health & social care | 2025 |
| Crystal Career Centre Limited | Professional & scientific | 2023 |
| Crystal Clean MK Ltd | Administrative & support | 2025 |
| Crystal Clear Glass & Glazing Ltd | Construction | 2022 |
| Crystal Estate Asset Management Ltd | Real estate | 2022 |
| Crystal Innovation Services Ltd. | Professional & scientific | 2018 |
| Crystal Motor Group Limited | Wholesale & retail | 2003 |
| Crystal Quality Care Limited | Health & social care | 2020 |
| Crystaleye Response Limited | Wholesale & retail | 2025 |
| Crystalglow Limited | Wholesale & retail | 2019 |
| Crytal Wave Limited | Administrative & support | 2024 |
| CS Balanced Books LLP | | 2025 |
| CS Cleaning (Milton Keynes) Limited | Administrative & support | 2003 |
| CS International Students Ltd | Education | 2023 |
| CS People Consulting Ltd | Professional & scientific | 2026 |
| CS8 Limited | Administrative & support | 2011 |
| CSA Investments Limited | Administrative & support | 2013 |
| CSC Consulting Limited | Professional & scientific | 2007 |
| CSC Projects Limited | Construction | 2021 |
| Cscn Ltd | Information & communication | 2018 |
| Csconsult Limited | Professional & scientific | 2011 |
| Csdc-Uk CIC | Professional & scientific | 2024 |
| CSK Retail Limited | Wholesale & retail | 2008 |
| CSKA1974 Limited | Transport & logistics | 2023 |
| CSL Engineering Services Ltd | Professional & scientific | 2009 |
| CSL Partners LLP | | 2020 |
| CSM SO Services Ltd | Construction | 2017 |
| CSN Chapel Limited | Real estate | 2014 |
| CSN Estates Limited | Real estate | 2014 |
| CSN Homes Ltd | Real estate | 2015 |
| CSN Projects Ltd | Real estate | 2015 |
| CSN Properties Limited | Real estate | 2010 |