| Change Advantage Limited | Professional & scientific | 2007 |
| Change Holdings Limited | Professional & scientific | 2018 |
| Chantry Hill Ltd | Financial services | 2018 |
| Chapman Construction (South East) Limited | Construction | 2019 |
| Chapman Lane Limited | Administrative & support | 2016 |
| Chapmor Consulting Limited | Professional & scientific | 2019 |
| Chapter Gym Limited | Other services | 2019 |
| Charb Limited | Construction | 2025 |
| Chardigital Ltd | Professional & scientific | 2019 |
| Charles Linton Developments Ltd | Real estate | 2022 |
| Charles Peel Place Management Company Limited | Real estate | 2026 |
| Charlesbeaumont Ltd | Wholesale & retail | 2023 |
| Charlton Wealth Management Limited | Financial services | 2012 |
| Charnock Hare Limited | Professional & scientific | 2015 |
| Charnwood Forest Brick Limited | Professional & scientific | 1998 |
| Charodyne International Limited | Professional & scientific | 2015 |
| Charter Projects Ltd. | Construction | 2004 |
| Charterhouse Sales Progression Ltd | Professional & scientific | 2026 |
| Chatesgrove Ltd | Agriculture & fishing | 2022 |
| Chelwood Classic Cars Ltd | Wholesale & retail | 2020 |
| Chemins Verts Limited | Agriculture & fishing | 2016 |
| Cherry Tree Childcare Ltd. | Health & social care | 2016 |
| Chesterhill Properties Limited | Administrative & support | 2004 |
| Chia MAY Project Management Ltd | Professional & scientific | 2025 |
| Chief & Turtle Limited | Wholesale & retail | 2022 |
| Chii Ltd | Health & social care | 2021 |
| Childcare Bookings Limited | Information & communication | 2017 |
| Children's Business Fair CIC | Education | 2023 |
| Chilli Balti Ltd | Hospitality | 2020 |
| Chiltern Student Villages Limited | Hospitality | 2003 |
| Chipstead Valley Garage Limited | Wholesale & retail | 2005 |
| Chirodza Consulting Limited | Information & communication | 2014 |
| CHK Operations Limited | Hospitality | 2025 |
| Chris M Luff Limited | Construction | 2006 |
| Christ Church Haywards Heath | Other services | 2007 |
| Chrome Property Ltd | Construction | 2022 |
| Chui Services Ltd | Health & social care | 2026 |
| Church Hill Holdings Limited | Real estate | 2015 |
| Cinder Hill Vineyard Limited | Agriculture & fishing | 2021 |
| Cine Spark Media Walls Ltd | Construction | 2024 |
| Cintotech Ltd | Professional & scientific | 2023 |
| Cior Consulting Limited | Professional & scientific | 2019 |
| City Investment Property Limited | Real estate | 2019 |
| City One Group Ltd | Construction | 2018 |
| City One Homes Limited | Real estate | 2016 |
| City One Properties 2 Limited | Real estate | 2016 |
| City One Properties Limited | Real estate | 2016 |
| City Plumbing Services Limited | Construction | 2007 |
| CJF Holdings Ltd | Professional & scientific | 2025 |
| CJT Healthcare Ltd | Health & social care | 2024 |
| Claire JEX Facilitation Ltd | Professional & scientific | 2019 |
| Claire Louise Elliott Limited | Professional & scientific | 2024 |
| Clare Horner & Co Limited | Professional & scientific | 2018 |
| Clarico Construction Services Limited | Construction | 2026 |
| Clark & Company Ltd. | Professional & scientific | 2013 |
| Classic Care Services Limited | Health & social care | 2003 |
| Clavijo Locum Ltd | Health & social care | 2014 |
| Clawaddicts Ltd | Other services | 2022 |
| Clean and Clear London Ltd | Administrative & support | 2024 |
| Clean Strategy Ltd | Professional & scientific | 2018 |
| Clef House Limited | Administrative & support | 2016 |
| Clermont Court Brighton Limited | Extraterritorial | 2005 |
| Cleveland Street Associates Limited | Administrative & support | 2017 |
| Click Travel Marketing & PR Ltd | Administrative & support | 2024 |
| Clifford Management Solutions Limited | Professional & scientific | 2006 |
| Climbfree Community Interest Company | Health & social care | 2021 |
| Clinic Privée Ltd | Other services | 2018 |
| Clinical Contact Staffing Limited | Administrative & support | 2012 |
| Clinicyou Limited | Information & communication | 2008 |
| Clive a Stenning Limited | Construction | 2002 |
| Clixx Limited | Other services | 2022 |
| Clockworktalent Limited | Administrative & support | 2012 |
| Cloud Distribution Management Limited | Transport & logistics | 2013 |
| Cloud Intuity Ltd | Information & communication | 2016 |
| Cloud Seven Meditation Limited | Health & social care | 2023 |
| Cloud Transformation Limited | Information & communication | 2016 |
| Cloudsurfers Film and TV Ltd | Information & communication | 2013 |
| Cloughs Deli Limited | Construction | 2012 |
| Clovetum Ltd | Professional & scientific | 2025 |
| Clubhouse Leisure Ltd | Arts & recreation | 2023 |
| CM Cleaning Ltd | Administrative & support | 2025 |
| CMH Accountancy Limited | Professional & scientific | 2021 |
| CMH Design Works Ltd | Professional & scientific | 2008 |
| CMW Automobiles Limited | Real estate | 1987 |
| Coaching With Nisanka Ltd | Administrative & support | 2019 |
| Coast Carpentry and Construction Ltd | Construction | 2022 |
| Coast Developments Limited | Construction | 2026 |
| Coco T Beauty Limited | Other services | 2025 |
| Cocom Consumer Electronics Limited | Manufacturing | 2009 |
| Cogent Media Limited | Information & communication | 2003 |
| Colbridge Engineering Limited | Manufacturing | 1979 |
| Colby Co. Creatives Ltd | Manufacturing | 2020 |
| Coldharbour Consultancy Limited | Information & communication | 2020 |
| Coldharbour Farm Barns Management Limited | Households | 1994 |
| Coldstream (Engineering) Limited | Manufacturing | 2018 |
| Cole and SON Plastering Services Ltd | Construction | 2008 |
| Cole Francis Limited | Professional & scientific | 2013 |
| Colee Investments Limited | Real estate | 2023 |
| Collaboration Partners Limited | Professional & scientific | 2025 |
| Collaborative Pathways Limited | Professional & scientific | 2024 |