| Crepescule Care Ltd | Health & social care | 2022 |
| Crescita Ventures Ltd | Financial services | 2022 |
| Cresscent Properties Ltd | Real estate | 2023 |
| Cresswell Automotive Limited | Wholesale & retail | 2025 |
| Cresswell Barber Co. Ltd | Other services | 2018 |
| Cresthill Technical Limited | Manufacturing | 2009 |
| Crestwood Property Management Limited | Real estate | 2010 |
| Creswell Baker Technology Ltd | Professional & scientific | 2024 |
| Crew Wellbeing Co Ltd | Education | 2025 |
| Crewpass Ltd | Information & communication | 2017 |
| Crib Burger Ltd | Hospitality | 2026 |
| Cribbs Ltd | Other services | 2018 |
| Cribr Limited | Information & communication | 2026 |
| Cricketers Inn (Curdridge) Limited | Real estate | 2018 |
| Crimson Quill Limited | Other services | 2025 |
| Crinan Consulting Ltd | Professional & scientific | 2021 |
| Cris Trans Ltd | Transport & logistics | 2016 |
| Crisp Group Holdings Limited | Financial services | 2017 |
| Crisp JNR Ltd | Construction | 2023 |
| Crispminster (Food Products) Limited | | 1982 |
| Cristian Costache Limited | Transport & logistics | 2023 |
| Cristian Transport Services Ltd | Transport & logistics | 2025 |
| Cristian-Petru Ifrim Limited | Transport & logistics | 2022 |
| Crita Care Ltd | Health & social care | 2022 |
| Critical Software Ltd | Information & communication | 2004 |
| Criticare UK Ambulance Service Limited | Health & social care | 2008 |
| CRK DRY Lining Limited | Construction | 2018 |
| CRM (Southern) Ltd | Construction | 2013 |
| CRM CAD Limited | Administrative & support | 2016 |
| CRM Project Solutions Ltd | Construction | 2026 |
| CRM Scaffolding Soton Ltd | Construction | 2020 |
| Crocks (Southern) Limited | Administrative & support | 2016 |
| Crocmazanlimited Limited | Construction | 2021 |
| Crocodilla Limited | Manufacturing | 2000 |
| Croft & Key Ltd | Real estate | 2026 |
| Croft Catering Services Ltd | Hospitality | 2022 |
| Croftness Building Ltd | Construction | 2021 |
| Cromar Construction Limited | Construction | 2023 |
| Cromlin 1 Limited | Professional & scientific | 2025 |
| Crop Power (UK) Limited | Manufacturing | 1995 |
| Cropz Limited | Other services | 2018 |
| Cross Connecting CIC | Education | 2024 |
| Cross Country Solutions Ltd | Construction | 2014 |
| Cross Keys Llantrisant Limited | Hospitality | 2019 |
| Cross Kitchens Ltd | Construction | 2018 |
| Cross-Culture Hub CIC | Other services | 2022 |
| Crossborder Logistics Ltd | Transport & logistics | 2022 |
| Crosscourt Limited | Hospitality | 1987 |
| Crossfit Romsey Limited | Arts & recreation | 2016 |
| Crosshouse Centre Management Limited | Households | 1988 |
| Crowbridge Assets Ukeig | | 2011 |
| Crowbridge Four Ltd | Administrative & support | 2011 |
| Crowd Control HQ Ltd | Manufacturing | 2024 |
| Crowd Control Records Ltd | Information & communication | 2025 |
| Crown & Timber Tree Services Ltd | Administrative & support | 2026 |
| Crown Developments Surrey Ltd | Construction | 2025 |
| Crown Heating & Plumbing Limited | Construction | 2016 |
| Crown House Residents Limited | Households | 2015 |
| Crown Monarch C.I.C. | Hospitality | 2009 |
| Crown Movers Limited | Transport & logistics | 2025 |
| Crown Scaffolding Hampshire Limited | Administrative & support | 2018 |
| Crown Spire Global Ltd | Wholesale & retail | 2026 |
| Crowndale Taverns Limited | Hospitality | 1995 |
| Crowneyes Ltd | Professional & scientific | 2026 |
| Crowther Contract Carriers Ltd | Transport & logistics | 1998 |
| Crowthorne Concepts Ltd | Construction | 2020 |
| Croxton Bars Limited | Hospitality | 2017 |
| CRS Landscapes Ltd | Administrative & support | 2014 |
| CRS Plumbing and Heating Specialists Ltd | Construction | 2015 |
| Crud Better Limited | Information & communication | 2014 |
| Cruise and Passenger Services Limited | Transport & logistics | 1996 |
| Cruise Azure Parking Ltd | Administrative & support | 2021 |
| Cruise Parking Services Ltd | Transport & logistics | 2025 |
| Cruise Parking Solutions Ltd | Transport & logistics | 2025 |
| Cruise Parking Southampton Ltd | Transport & logistics | 2024 |
| Cruise Taxis Ltd | Transport & logistics | 2022 |
| Cruisepark Southampton Limited | Administrative & support | 2015 |
| Cruiseparkandride Ltd | Transport & logistics | 2024 |
| Crunch Design Limited | Professional & scientific | 2025 |
| Crunchwise Accountants Ltd | Professional & scientific | 2025 |
| Cruze Building & Construction Ltd | Construction | 2026 |
| Cryoslices Limited | Manufacturing | 2023 |
| Crypto BET Limited | Arts & recreation | 2023 |
| Crystal Car Wash 2023 Ltd | Administrative & support | 2023 |
| Crystal Clear Industries Ltd | Information & communication | 2025 |
| Crystal Clear Signs and Graphics Limited | Professional & scientific | 2024 |
| Crystal Diamond Care for YOU Limited | Health & social care | 2018 |
| Crystal Legal Services Limited | Other services | 2009 |
| Crystaldeep Limited | Real estate | 1995 |
| CS Developments (South) Limited | Construction | 2018 |
| CS Unmanned Aerial Vehicles Ltd | Manufacturing | 2025 |
| Csaba Halasz Ltd. | Information & communication | 2017 |
| CSF (Building Services) Limited | Construction | 2001 |
| CSJ Hair Limited | Other services | 2021 |
| Cskr Ltd | Extraterritorial | 2017 |
| Cskrt Ltd | Extraterritorial | 2021 |
| CSL Engineers Ltd | Construction | 2011 |
| CSM (Basingstoke) Limited | Wholesale & retail | 1993 |
| CSM Segensworth Limited | Administrative & support | 2017 |
| CSM South Limited | Financial services | 2017 |