| Croft Property Services Limited | Construction | 2024 |
| Cromhill (Properties) Limited | Real estate | 2003 |
| Cromwell Financial Services Limited | Financial services | 2025 |
| Cromwell MDI Ltd | Information & communication | 2018 |
| Crosby Farm Residents Management Company Limited | Households | 2022 |
| Cross Trees Park (Shrivenham) Management Company Limited | Households | 2019 |
| Crossfire Badminton Ltd | Wholesale & retail | 2026 |
| Crossfit Reading Limited | Arts & recreation | 2010 |
| Crossways Freehold Binfield Limited | Households | 2024 |
| Crouch Airline Consultancy (Cacl) Ltd | Manufacturing | 2025 |
| Crowdwow Ltd. | Professional & scientific | 2012 |
| Crowland Holdings Ltd | Real estate | 2025 |
| Crown 360 Ltd | Real estate | 2025 |
| Crown Assets Limited | Real estate | 2025 |
| Crown Bennbridge Investments Limited | Financial services | 2024 |
| Crown FM Ltd | Information & communication | 2025 |
| Crown Golf Group Limited | Arts & recreation | 2002 |
| Crown Golf Property Limited | Real estate | 2004 |
| Crown Security Management Limited | Administrative & support | 2002 |
| Crowngrove Technical Limited | Professional & scientific | 2001 |
| Crucible Creations Ltd | Financial services | 2009 |
| Cruisectrl Ltd | Education | 2026 |
| Crux Careers Ltd | Administrative & support | 2016 |
| Crystal Clean Garment Care Limited | Hospitality | 2004 |
| Crystal Clean Solutions Ltd. | Administrative & support | 1997 |
| Crystal Clear Water Limited | Real estate | 2023 |
| Crystal Infinity Shield Ltd | Wholesale & retail | 2018 |
| Crystal View Properties Ltd | Real estate | 2025 |
| CS Homes & Renovations Ltd | Real estate | 2025 |
| CS Imaging Limited | Health & social care | 2014 |
| Cs&A Consultants Ltd | Professional & scientific | 2025 |
| CSE Solutions Ltd | Administrative & support | 2019 |
| CSG Consulting Ltd | Professional & scientific | 2024 |
| CT Trading Limited | Extraterritorial | 2004 |
| CTM Medical Services Ltd | Education | 2022 |
| CTS Contracts Ltd | Construction | 2006 |
| CTW Camberley Holdings Limited | Professional & scientific | 2016 |
| CTW Camberley Limited | Wholesale & retail | 2000 |
| CTW Removals Limited | Transport & logistics | 2016 |
| Cuckoo Dene Properties Limited | Real estate | 2019 |
| Cumberland Lodge Management (Camberley) Limited | Hospitality | 1992 |
| Cumberland Street Associates Limited | Professional & scientific | 2024 |
| Cumberland Street Investments Limited | Real estate | 2023 |
| Cuppaconnect Limited | Other services | 2017 |
| Curiosity Learning Labs Ltd | Information & communication | 2026 |
| Curious Adaptive 24 Limited | Information & communication | 2024 |
| Curran Heating & Plumbing Ltd | Construction | 2021 |
| CURRY4U Ltd | Wholesale & retail | 2023 |
| Custom Electrical Limited | Construction | 2019 |
| Cvqo Ltd | Education | 2006 |
| CWS Food and Hospitality Consulting Ltd | Hospitality | 2024 |
| CWS Management Ltd | Administrative & support | 2016 |
| Cyberdyme Systems Ltd | Wholesale & retail | 2026 |
| Cymbionic Ltd | Professional & scientific | 2020 |
| D & G Painters LLP | | 2007 |
| D & J Fernando Limited | Real estate | 2015 |
| D & L Parratt Limited | Professional & scientific | 2021 |
| D & P Financial Solutions Limited | Financial services | 2005 |
| D C Commercial Services Ltd. | Wholesale & retail | 2015 |
| D Holwell Consultancy Limited | Health & social care | 2009 |
| D L Holloway (Property) Limited | Real estate | 2017 |
| D L Holloway Limited | Administrative & support | 2009 |
| D Minardi Limited | Other services | 2003 |
| D'Zign Build Ltd | Construction | 1999 |
| D. Gibbon & Sons Limited | Wholesale & retail | 1990 |
| D.A. Hart Associates Limited | Administrative & support | 2010 |
| D.Asees Ltd | Arts & recreation | 2021 |
| D.J. Hollis & Co. (Carpentry Contractors) Limited | Manufacturing | 1977 |
| D.L.E. Property Services Ltd | Real estate | 2023 |
| D.L.P. Associates (Buildings) Limited | Construction | 1988 |
| D.L.P. Associates Limited | Professional & scientific | 1987 |
| D.P. Plumbing and Heating Limited | Construction | 1992 |
| D.SMITH22 Rigging Ltd | Construction | 2022 |
| D2M Holdings Limited | Real estate | 2021 |
| DAB IT Solutions Limited | Information & communication | 2013 |
| DAE Thumwood Contractors Ltd | Construction | 2016 |
| Dafegen Limited | Information & communication | 2026 |
| Dagbreek Solutions Limited | Manufacturing | 2018 |
| Dahiyavidhi Transport Ltd | Manufacturing | 2026 |
| Dahlen Limited | Real estate | 2020 |
| Daisy Fit Ltd | Arts & recreation | 2025 |
| Dalton Training Limited | Professional & scientific | 2014 |
| Danae International Ltd | Wholesale & retail | 2013 |
| Dancey Bouncy Castle Hire Ltd | Administrative & support | 2020 |
| Daniel Stevenson Construction Limited | Construction | 2009 |
| Darby Green Catering Limited | Hospitality | 2025 |
| Darby Green Friars Limited | Hospitality | 2025 |
| Daria Global Ltd | Extraterritorial | 2024 |
| Darkwa Ltd | Information & communication | 2024 |
| Darna Financial Services Ltd | Information & communication | 2024 |
| Darsh Property Ltd | Real estate | 2017 |
| Darsons Services Ltd | Administrative & support | 2019 |
| Dartbridge Systems Limited | Information & communication | 2017 |
| Dartwall Designs Ltd | Wholesale & retail | 2020 |
| Dashgrow Ltd | Information & communication | 2023 |
| Dashwood Close Management Co (Camberley) Ltd | Households | 2015 |
| Dashwood Close Management Company Limited | Households | 2012 |
| Data Centre Technical Services Limited | Professional & scientific | 2024 |
| Data Dialogue Limited | Information & communication | 1993 |
| Data Tran Electricals Limited | Construction | 2009 |