| Carrolljohnson Ltd | Professional & scientific | 2026 |
| Carters Estates Ltd | Real estate | 2020 |
| Casa Live Music Management Ltd | Information & communication | 2023 |
| Casa Solutions Ltd | Other services | 2024 |
| Cascadia Author Services Limited | Information & communication | 2022 |
| Casis Consulting Limited | Information & communication | 2014 |
| Cassini Property Holdings Limited | Real estate | 2003 |
| Castle Motors Sandhurst Limited | Wholesale & retail | 2006 |
| Casualz Limited | Wholesale & retail | 2024 |
| Catchfire AI Ltd | Professional & scientific | 2025 |
| Catchfire Group Ltd | Professional & scientific | 2025 |
| Catchfire PR Ltd | Professional & scientific | 2025 |
| Caterease Ltd. | Hospitality | 2015 |
| Cathedral Court RTM Company Limited | Households | 2010 |
| Cavendish Place (Block H) Flat Management Company Limited | Households | 1999 |
| Cavendish Place (Blocks a C & D) Flat Management Company Limited | Households | 1997 |
| Cavendish Place (Blocks B E F & G) Flat Management Company Limited | Households | 1997 |
| Cavendish Place Residents Association Limited | Other services | 1998 |
| CBS Electrical (U.K.) Ltd | Construction | 2018 |
| CCR Engineering Ltd | Professional & scientific | 2025 |
| Cdbowler Consulting Ltd | Professional & scientific | 2024 |
| CDS Software Solutions Limited | Manufacturing | 2001 |
| Cecille London Limited | Wholesale & retail | 2013 |
| Celebrity Protection Organisation Ltd | Administrative & support | 2019 |
| Cemhair Ltd | Other services | 2023 |
| Centras Associates Limited | Information & communication | 2009 |
| CER Solutions Ltd | Professional & scientific | 2023 |
| CF UK Investment Limited | Real estate | 2021 |
| Chaamo Ltd | Other services | 2024 |
| Chace Technologies Limited | Information & communication | 1998 |
| Chalfont Consultancy Ltd | Professional & scientific | 2013 |
| Chandlers Renovations Maintenance & Cleaning Limited | Construction | 2013 |
| Change Agenda Ltd | Information & communication | 2022 |
| Change Tracker Limited | Professional & scientific | 2015 |
| Char-Lee Property Ltd | Real estate | 2021 |
| Chase Health and Safety Consultancy Ltd | Construction | 2025 |
| Chauhan Consulting Limited | Information & communication | 2025 |
| Chef James Lawrence Limited | Hospitality | 2021 |
| Chelsea Kitchens & Bathrooms Ltd | Construction | 2015 |
| Cher Accounting Services Ltd | Professional & scientific | 2017 |
| Chesilton Design Limited | Households | 2013 |
| Chestnut Court (Farnborough) Management Company Limited | Households | 1986 |
| Chestnut View (Farnborough) M.C. Limited | Administrative & support | 2003 |
| Chiles Construction Ltd | Construction | 2024 |
| Chimera VR Limited | Arts & recreation | 2018 |
| China Supply Chain Solutions Limited | Professional & scientific | 2016 |
| Chineside Property Limited | Real estate | 2024 |
| Chris Wells Consulting Limited | Professional & scientific | 2026 |
| Chromis Investments Limited | Real estate | 2021 |
| Chromis UK Limited | Manufacturing | 2005 |
| Churchill Fish & Chips Fleet Ltd | Hospitality | 2025 |
| CHW Communications Limited | Information & communication | 2017 |
| CIJ Holdings Ltd | Real estate | 2026 |
| Ciosf General Partner Limited | Financial services | 2015 |
| Circle South Consulting Limited | Information & communication | 2010 |
| Citicourt & Co Limited | Financial services | 1991 |
| Citizens Advice - Hart District Limited | Other services | 2006 |
| Citygold Limited | Wholesale & retail | 2007 |
| Cjgf Ltd | Real estate | 2022 |
| CJL Consultants Limited | Professional & scientific | 2021 |
| CJM Caravans Limited | Real estate | 2002 |
| CKB Consultants Limited | Professional & scientific | 2003 |
| Claremont Place (Blackwater) Management Company Limited | Households | 2005 |
| Clarence Court RTM Company Limited | Households | 2023 |
| Clarence Road Properties Limited | Extraterritorial | 2013 |
| Clarity Contracts Limited | Professional & scientific | 2011 |
| Classic Bike Workshop Limited | Wholesale & retail | 2013 |
| Classic Super Bikes Limited | Wholesale & retail | 2008 |
| Classical Ballet Centre (Surrey) Limited | Arts & recreation | 2006 |
| Clean in UK Limited | Administrative & support | 2014 |
| Clean Locations Limited | Administrative & support | 2023 |
| Clear Future HR Ltd | Professional & scientific | 2023 |
| Clear Qube Consulting Limited | Professional & scientific | 2023 |
| Clearflow Plumbing Ltd | Construction | 2023 |
| Clearwater Apartments Ltd | Real estate | 2021 |
| Cliveden 40 Ltd | Professional & scientific | 2020 |
| Cloud Data Protection Limited | Information & communication | 2023 |
| CLOUD5 Comms Ltd | Information & communication | 2024 |
| CLS Healthcare Communications Limited | Professional & scientific | 2014 |
| Club Calida Limited | Professional & scientific | 1988 |
| Club Reformer Studios Ltd | Arts & recreation | 2024 |
| CMC Catering Ltd | Hospitality | 2018 |
| Co-Restore Solutions Ltd | Professional & scientific | 2020 |
| Coach House Cafe (Fleet) Ltd | Hospitality | 2022 |
| Coat & Colour Limited | Construction | 2026 |
| Coco WO Ltd | Professional & scientific | 2020 |
| Cohome Collective Ltd | Real estate | 2025 |
| Coin OP by Card Ltd | Other services | 2023 |
| Colin Baldwin Mortgage Protection Limited | Real estate | 2007 |
| Collaboration 360 Ltd | Professional & scientific | 2019 |
| Collins Gardens Ltd | Other services | 2018 |
| Collision Support Group Ltd | Wholesale & retail | 2026 |
| Collyer Construction Ltd | Construction | 2009 |
| Colourful Dove Limited | Manufacturing | 2013 |
| Colourlab Ltd | Manufacturing | 2006 |
| Colourwheel North Hants Limited | Education | 2020 |
| Comet Customs Ltd | Manufacturing | 2023 |
| Command Data Incorporated | | 1996 |
| Commercial Dishwasher Services Limited | Manufacturing | 1997 |
| Commercial Timber Sales Limited | Agriculture & fishing | 1991 |