| Coresource Ltd | Professional & scientific | 2025 |
| Corineus Capital Holdings Ltd | Financial services | 2023 |
| Corineus Capital Limited | Real estate | 2012 |
| Corinthia Court Management Company Limited | Households | 1987 |
| Corinthia Property Ltd | Construction | 2022 |
| Cormorant Holdings Limited | Other services | 2023 |
| Cormorant Property (Cleveland Road) Ltd | Construction | 2017 |
| Cormorant Property Limited | Construction | 2013 |
| Cornerstone Consultants Ltd | Education | 2024 |
| Cornhill Plumbing and Developments Ltd | Real estate | 2021 |
| Cornish Residential Properties Limited | Real estate | 2017 |
| Corporate and Public Safety Ltd | Administrative & support | 2016 |
| Corporate Escapology Limited | Professional & scientific | 2020 |
| Cose Limited | Education | 1995 |
| Cosimmetry Ltd | Information & communication | 2022 |
| Cosite Contractors Ltd | Construction | 2013 |
| Cositex Ltd | Wholesale & retail | 2020 |
| Cosmic Fable TCG Limited | Wholesale & retail | 2026 |
| Cosmic WOW Limited | Other services | 2014 |
| Couch to Recovery Limited | Education | 2024 |
| Coughtrey Limited | Arts & recreation | 2018 |
| Count on TIM Ltd | Professional & scientific | 2026 |
| Country & Suburban Investments Limited | Construction | 1989 |
| Country Gardens (Selsey) Ltd | Wholesale & retail | 2017 |
| Courage to Change Coaching Limited | Professional & scientific | 2023 |
| Courtfield House Residents Company Limited | Real estate | 2009 |
| Courtney Designs Limited | Professional & scientific | 1993 |
| Covash Limited | Administrative & support | 2009 |
| Covenant Motors Limited | Wholesale & retail | 2025 |
| Covers Limited | Extraterritorial | 1979 |
| COX AV Limited | Construction | 2013 |
| Coyote LY Limited | Construction | 2024 |
| Cozens Software Solutions Limited | Information & communication | 2015 |
| CP Moran Ltd | Health & social care | 2019 |
| CP Renovations Ltd | Real estate | 2020 |
| CP Vehicle Services Ltd | Wholesale & retail | 2022 |
| Cpjh Limited | Health & social care | 2022 |
| CPN & Partners Limited | Financial services | 2023 |
| CPN Investment Management LLP | | 2012 |
| CPW Consulting Limited | Professional & scientific | 2016 |
| Cradlers House Workshop Ltd | Other services | 2024 |
| Crafty Bishop (West Sussex) Ltd | Hospitality | 2018 |
| Crafty Films Ltd | Other services | 2014 |
| Craigweil Private Estate Limited | Households | 1980 |
| Cranecuts Ltd | Other services | 2023 |
| Craneofficial Ltd. | Wholesale & retail | 2025 |
| Cranmore House Consulting Ltd | Professional & scientific | 2020 |
| Cranston Pickles Ltd | Hospitality | 2018 |
| Craske Associates Limited | Professional & scientific | 2008 |
| Craylabel Ltd | Wholesale & retail | 2020 |
| Cream Travel Limited | Professional & scientific | 2004 |
| Create Action Limited | Information & communication | 2016 |
| Creation of Cars Films 1992 Ltd | Professional & scientific | 2016 |
| Creations Hair Salon Chichester Limited | Other services | 2012 |
| Creative Advances Limited | Other services | 1983 |
| Creative Approaches Ltd | Arts & recreation | 2016 |
| Creative Atventures Ltd | Arts & recreation | 2023 |
| Creative Beatz-Jam CIC | Hospitality | 2023 |
| Creative Caves Media Ltd | Information & communication | 2013 |
| Creative Coaching Chichester Ltd | Administrative & support | 2019 |
| Creative Crackers Limited | Manufacturing | 1998 |
| Creative Heritage Limited | Professional & scientific | 2007 |
| Creative Seeks Ltd | Professional & scientific | 2023 |
| Creative Solutions (Arts and Regeneration) Limited | Arts & recreation | 2005 |
| Creative Spa Solutions Limited | Professional & scientific | 2006 |
| Creative Steps Nursery Limited | Health & social care | 2025 |
| Creative Windows (Bedford) Ltd | Manufacturing | 2013 |
| Cresdale Limited | Professional & scientific | 2020 |
| Crewed Ltd | Professional & scientific | 2007 |
| Crgild Ltd | Manufacturing | 2023 |
| Crimsham Farm CIC | Agriculture & fishing | 2019 |
| Crisp Websites Limited | Wholesale & retail | 2002 |
| Cristie Technology Advisers Limited | Professional & scientific | 2023 |
| CRJ Lettings Ltd | Real estate | 2013 |
| Crockerhill Cars (Chichester) Ltd | Wholesale & retail | 2005 |
| Crofton (West) Residents Management Company Ltd | Households | 2020 |
| Cromarty Construction Limited | Construction | 1999 |
| Cross County Demolition & Salvage Ltd | Construction | 2025 |
| Cross Street Enterprises Ltd | Financial services | 2024 |
| Crossfit Bosham Ltd | Arts & recreation | 2022 |
| Crosslingua Translations Limited | Administrative & support | 2016 |
| Crossmeads Limited | Real estate | 2012 |
| Crossmeads Management Limited | Real estate | 2019 |
| Crosstech Recruitment Ltd | Administrative & support | 2024 |
| Crouchers Hotel Limited | Hospitality | 2007 |
| Crowd Connect Media Ltd | Professional & scientific | 2024 |
| Crowhurst Road Limited | Construction | 2016 |
| Crown Garden & Maintenance Ltd | Construction | 2025 |
| Crown Taverns (Chichester) Limited | Hospitality | 1982 |
| Crowns & Coronets Limited | Professional & scientific | 2013 |
| Crownz Marquees Ltd | Hospitality | 2023 |
| CRS Air Conditioning Limited | Construction | 2005 |
| Crummles Limited | Real estate | 2021 |
| Cryo-Dent Ltd | Professional & scientific | 2025 |
| Cryolab Limited | Professional & scientific | 2000 |
| Crystal Clear Windows Southern Limited | Construction | 2004 |
| Crystal Singing Bowls Limited | Wholesale & retail | 2011 |
| Crystalspan Limited | Administrative & support | 2007 |
| CSM Contract Management Ltd | Professional & scientific | 2019 |
| CSS Activities Limited | Education | 2015 |