| Case Law Solutions Limited | Real estate | 2014 |
| Castlecare Limited | Construction | 2008 |
| Castlehove Limited | Real estate | 1983 |
| Category Leaders Ltd | Information & communication | 2025 |
| Cavello Aesthetics Ltd | Health & social care | 2021 |
| Caxton Rise Residents Company Limited | Households | 1994 |
| CC Technology Labs Limited | Real estate | 2023 |
| CD Electrical (Surrey) Ltd | Construction | 2019 |
| Cedars Court RTM Company Limited | Households | 2018 |
| Celadon 24 Limited | Hospitality | 2018 |
| Centora James Limited | Information & communication | 2005 |
| Ceol Limited | Information & communication | 2019 |
| Ceox Technologies Ltd | Professional & scientific | 2021 |
| CFO Value UK Ltd | Professional & scientific | 2025 |
| Cfodragon Limited | Professional & scientific | 2016 |
| CGK Consulting Ltd. | Financial services | 2017 |
| Chairworks Limited | Wholesale & retail | 2009 |
| Chalklands Limited | Professional & scientific | 2001 |
| Chamaeleon Construction Limited | Construction | 2012 |
| Chamberlain & Robinson Ltd | Real estate | 2006 |
| Champion Meadow Ltd | Real estate | 2012 |
| Chance Brown Tech Limited | Information & communication | 2024 |
| Change IT Consultancy Ltd | Information & communication | 2010 |
| Charla Carbon Ltd | Information & communication | 2024 |
| Charles Marcus Global Ltd | Professional & scientific | 2019 |
| Charlie and Ginger Ltd | Hospitality | 2018 |
| Charlie and Kate Ltd | Other services | 2024 |
| Charlie Manton Ltd | Information & communication | 2024 |
| Charlotte Heal Design Limited | Professional & scientific | 2017 |
| Charlton Global Consultancy Ltd | Administrative & support | 2022 |
| Charterhouse Court Management Company Limited | Households | 1990 |
| Chatsworth Place RES. Assoc. (Oxshott) Limited | Households | 1994 |
| Chawton Hill Associates Limited | Professional & scientific | 2001 |
| Chefs Corner Limited | Hospitality | 2026 |
| Chelsea Workshop (Sales) Limited(The) | Wholesale & retail | 1982 |
| Chelsea Workshop Limited(The) | Wholesale & retail | 1982 |
| Chesham Heights Management Company Limited | Households | 2007 |
| Chessington Pipeline Ltd | Construction | 2016 |
| Chessington Sales Ltd | Wholesale & retail | 2025 |
| Chessman Limited | Professional & scientific | 1982 |
| Chesson JAN Holdings Ltd | Financial services | 2026 |
| Chevron Close Management Company Ltd | Households | 2023 |
| Chilli Project Artisan Foods Limited | Manufacturing | 2019 |
| Choice Hub Ltd | Wholesale & retail | 2024 |
| CHR Estate & Equine Ltd | Agriculture & fishing | 2025 |
| Christie Close Management Company Limited | Households | 1995 |
| Christies Lettings Ltd | Professional & scientific | 2012 |
| Christies Residential Limited | Administrative & support | 2010 |
| Christopher Smith Associates LLP | | 2005 |
| Chun Tian Limited | Health & social care | 2023 |
| Chunky Cheeks Ltd | Wholesale & retail | 2026 |
| Church House Flats Management (Great Bookham) Limited | Households | 1976 |
| Church Street Investments Limited | Real estate | 2000 |
| Churchfields Residents Company Limited | Households | 1989 |
| Cinematic Electrical Ltd | Construction | 2024 |
| Cisilion (Group) Limited | Information & communication | 2013 |
| Cisilion Limited | Information & communication | 2000 |
| Citrus Bidco Limited | Financial services | 2025 |
| Citrus EBT Limited | Financial services | 2025 |
| Citrus Midco Limited | Financial services | 2025 |
| Citrus Topco Limited | Financial services | 2025 |
| City Key Homes Limited | Construction | 2018 |
| City Waste Solutions Ltd | Water & waste | 2020 |
| City West Works Limited | Construction | 2012 |
| Citywide Financial Partners Limited | Financial services | 2003 |
| Civitas Energy Ltd | Energy | 2018 |
| CJW Consulting Limited | Professional & scientific | 2018 |
| CK Air Ltd | Manufacturing | 2025 |
| CK Autohire Limited | Administrative & support | 2025 |
| CK Coaching and Consulting Ltd | Professional & scientific | 2022 |
| CK NET Limited | Information & communication | 2003 |
| Clandon Park Nursery Ltd | Health & social care | 2022 |
| Clara Systems Limited | Information & communication | 2025 |
| Clare West Consulting Ltd | Information & communication | 2023 |
| Clarendon Park (Oxshott) Residents Company Limited | Households | 1988 |
| Clarity Cedar House Limited | Construction | 2020 |
| Clat Property Services Ltd | Real estate | 2023 |
| Clayton Wilson Education Ltd | Education | 2016 |
| Clcf Ltd | Real estate | 2020 |
| Clean Medical Ltd | Manufacturing | 2024 |
| Cleaningironingcarecom Limited | Extraterritorial | 2016 |
| Clearline Group Ltd | Construction | 2024 |
| Cleaver Consulting Limited | Professional & scientific | 2009 |
| Clever Music Limited | Extraterritorial | 1978 |
| Clive Weston & Co Limited | Construction | 2007 |
| Clonmount Limited | Households | 1993 |
| Cloud Assist Group Ltd | Information & communication | 2021 |
| Cloud Talk Limited | Health & social care | 2011 |
| Cloudhub Ltd | Information & communication | 2022 |
| Clovelly Downs Management Company Limited | Households | 2000 |
| CM Healthcare Ltd | Health & social care | 2025 |
| CMG Homes Limited | Health & social care | 1998 |
| Coach House Mews (Walton on Thames) Management Company Limited | Households | 2011 |
| Coachanalysis Ltd | Education | 2022 |
| Coalition of Licensed Trade Accountants Limited | Professional & scientific | 2023 |
| Coates TV Limited | Information & communication | 2005 |
| Cobblestones Management Company Limited | Households | 2003 |
| Cobham Care Ltd | Health & social care | 2003 |
| Cobham RD Barbers Ltd | Other services | 2023 |
| Cobham Way Limited | Professional & scientific | 2019 |