| CFO2GO Limited | Professional & scientific | 2002 |
| CG PO21 Ltd | Hospitality | 2023 |
| Cgcomposites Ltd | Manufacturing | 2024 |
| Cgheraty Ltd | Manufacturing | 2026 |
| CGM Group Sussex Ltd | Hospitality | 2025 |
| CH Social Ltd | Wholesale & retail | 2026 |
| Chalcraft Ltd | Administrative & support | 2004 |
| Chalcroft Associates Limited Liability Partnership | | 2008 |
| Champion Associates Limited | Other services | 2012 |
| Chancery Law Publishing Limited | Extraterritorial | 1987 |
| Change OUR Culture Limited | Other services | 2021 |
| Channel View Residents Ltd | Households | 2022 |
| Chapman QA Solutions Ltd | Professional & scientific | 2022 |
| Chapmore END Properties Limited | Real estate | 2014 |
| Charles Square (Freehold) Management Company Limited | Households | 2021 |
| Charlesbullionandcoins Ltd | Extraterritorial | 2025 |
| Charlotte Rose Ltd | Professional & scientific | 2020 |
| Charlton Grace HW Limited | Real estate | 2020 |
| Charman Property Ltd | Construction | 2019 |
| Chatterbox Cafe Grill Limited | Hospitality | 2023 |
| Cheli Ltd | Wholesale & retail | 2022 |
| Chen Catering Limited | Hospitality | 2021 |
| Cherry Tree Lane (Ewhurst) Resident Management Company Ltd | Households | 2018 |
| Cherry Tree Music Limited | Information & communication | 2013 |
| Cheshire Management Company (NO.2) Limited | Households | 1994 |
| Cheshire Management Company Limited | Households | 1994 |
| Chez MOI Limited | Hospitality | 2019 |
| CHI LI Accounting Services Ltd | Professional & scientific | 2001 |
| Chichester Car Wash Ltd | Other services | 2022 |
| Chichester Companions Limited | Transport & logistics | 2026 |
| Chichester Electrical Ltd | Construction | 2009 |
| Chichester Granite Ltd | Manufacturing | 2022 |
| Chichester Motorhomes Ltd | Wholesale & retail | 2015 |
| Chichester Notary Limited | Professional & scientific | 2020 |
| Chichester Taxis Ltd | Transport & logistics | 2024 |
| Chichester Windows Limited | Construction | 2012 |
| Chilton Holdings Ltd | Real estate | 2024 |
| China Garden 88 UK Ltd | Hospitality | 2025 |
| Chivalry Limited | Information & communication | 2015 |
| CHN 168 Ltd | Hospitality | 2025 |
| Choice Networking Ltd | Information & communication | 2025 |
| Chris Davis Management Limited | Administrative & support | 1996 |
| Chris Robson Logistics Limited | Administrative & support | 2020 |
| Chris Skinner Landscapes Limited | Administrative & support | 2002 |
| Chris Tomkins Limited | Construction | 2003 |
| Christie Construction Limited | Construction | 1999 |
| Christopher Barlow Plumbing & Heating Ltd | Construction | 2026 |
| Christopher Properties Ltd | Real estate | 2020 |
| Chronos Logistics Ltd | Transport & logistics | 2019 |
| Chummar Ltd | Health & social care | 2022 |
| Cinderella’S Laundry Ltd | Other services | 2022 |
| Ciquerio Consulting Limited | Information & communication | 2024 |
| Cissonius Ltd | Wholesale & retail | 2020 |
| Citrus DRY Ltd | Wholesale & retail | 2025 |
| Civil Site Professional Services Ltd | Professional & scientific | 2015 |
| CJB Land Management Ltd | Agriculture & fishing | 2023 |
| CJS Bistro Ltd | Hospitality | 2025 |
| CKA Properties Limited | Real estate | 2024 |
| Clacy Contracting Ltd | Administrative & support | 2023 |
| Claire Tyler Couture Limited | Manufacturing | 2018 |
| Clarkes Residential Estates Limited | Real estate | 2025 |
| Classic Construction Sussex Ltd | Construction | 2024 |
| Clean Slate Copy School Ltd | Extraterritorial | 2023 |
| Clean Slate Enterprises Ltd | Extraterritorial | 2021 |
| Cleanheating Company Ltd | Financial services | 2025 |
| Cleanxpro Ltd | Administrative & support | 2022 |
| Clearr Ltd | Information & communication | 2026 |
| Cleland Thom Consultancy Ltd | Professional & scientific | 2024 |
| Cleva Scope Ltd | Information & communication | 2025 |
| Cleveland Road Limited | Households | 2007 |
| Cliff Harper Consultancy Limited | Professional & scientific | 2015 |
| Clinical Research Solutions Limited | Information & communication | 2023 |
| Clive Harrington Consultancy Ltd | Professional & scientific | 2020 |
| Close S & E Limited | Manufacturing | 2011 |
| Clothing Kingdom Ltd | Wholesale & retail | 2024 |
| Cloudhostuk Ltd | Information & communication | 2011 |
| Clova Property Services Ltd | Construction | 2022 |
| Clover 50029 Limited | Administrative & support | 2007 |
| Clover Garden Maintenance Limited | Administrative & support | 2024 |
| Clover House Homes Limited | Extraterritorial | 2013 |
| CM Tree Care South Ltd | Agriculture & fishing | 2026 |
| Cnstrct Ltd | Professional & scientific | 2022 |
| Coastal Carpets (West Sussex) Limited | Wholesale & retail | 2013 |
| Coaster Breaks Ltd | Administrative & support | 2020 |
| Coastline Bathrooms & Kitchens Limited | Construction | 2011 |
| Coastline Tiles Ltd | Wholesale & retail | 2017 |
| Coastline Woodworks Ltd | Construction | 2014 |
| Coba Rooms Ltd | Construction | 2020 |
| Cobalt Cards Ltd | Wholesale & retail | 2024 |
| Cobaltag Limited | Professional & scientific | 2014 |
| Cockburn's Tea Rooms & Confectioners Ltd | Wholesale & retail | 2017 |
| Cockburn's Tea Rooms Ltd | Wholesale & retail | 2013 |
| Codestak Ltd | Information & communication | 2023 |
| Coffee Coastal Ltd | Hospitality | 2025 |
| Cohen Electrical Ltd | Construction | 2022 |
| Collectable Grading Services Ltd | Wholesale & retail | 2021 |
| College Gardens NO.2 Residents Company Limited | Households | 1990 |
| Collingwoods Estate Agents Limited | Real estate | 2023 |
| Colour House One Limited | Real estate | 2004 |
| Colour POP at Home Limited | Arts & recreation | 2016 |