| Chux Engineering Ltd | Construction | 2015 |
| Ciaramella's Limited | Professional & scientific | 2017 |
| Cissbury Chase (Worthing) Management Company Limited | Households | 2013 |
| CJL Chauffeur Services Ltd. | Transport & logistics | 2014 |
| CK Mobile Mechanics Ltd | Wholesale & retail | 2024 |
| Clanville Rise (Flats) Residents Association Limited | Households | 2012 |
| Clarehaven Court Limited | Households | 1986 |
| Clarence Court Management Company (Worthing) Limited | Households | 1994 |
| Classic Mantels Limited | Manufacturing | 2016 |
| Clear Smile Hygiene and Therapy Ltd | Health & social care | 2026 |
| Cleghorn Lighting Ltd | Manufacturing | 2006 |
| Clernara Court Management Limited | Households | 1998 |
| Cloudbreak Investments Limited | Professional & scientific | 2012 |
| CMR Fire Prevention Limited | Public administration | 2017 |
| Co-Qualitas Limited | Professional & scientific | 2025 |
| Coastal Coaching (Sussex) Limited | Other services | 2020 |
| Colby Relf Associates Ltd | Professional & scientific | 2024 |
| Collectively HER Limited | Administrative & support | 2017 |
| Complete Stillness Limited | Real estate | 2015 |
| Computer Assets Limited | Information & communication | 1993 |
| Concise Surfacing Ltd | Construction | 2006 |
| Constructive Evaluation Limited | Professional & scientific | 1993 |
| Content Consulting Limited | Professional & scientific | 2010 |
| Cookielossal Ltd | Hospitality | 2022 |
| Coopers Yard Management Company Limited | Households | 1988 |
| Corbett Homes Ltd | Construction | 2023 |
| Corbett Investments Southern Ltd | Real estate | 2024 |
| Coulson's Conservatories, Windows and Doors Ltd | Wholesale & retail | 2023 |
| Countryside Homeowners WG Management Company Limited | Extraterritorial | 2021 |
| County Stone Holdings Limited | Administrative & support | 2009 |
| Craigweil Manor Flats Residents Association Limited | Households | 1991 |
| Crawley Into the Green CIC | Education | 2018 |
| Creaction Construction Ltd | Construction | 2019 |
| Crown Place Management Company Limited | Households | 1999 |
| CS Logistics Ltd | Transport & logistics | 2023 |
| CSC Global Partners Limited | Professional & scientific | 2024 |
| Cuboso Limited | Households | 2010 |
| CWR Management Ltd | Water & waste | 2026 |
| D M Chainsaws Ltd | Agriculture & fishing | 2001 |
| D.M.S. (Air Freight) Limited | Extraterritorial | 1976 |
| Dando Drilling Limited | Manufacturing | 2024 |
| Danny Grigg Limited | Construction | 2016 |
| Dare DC Limited | Construction | 2026 |
| DARE-DC1 Ltd | Other services | 2026 |
| DARE-DC2 Ltd | Other services | 2026 |
| DARE-DC3 Ltd | Other services | 2026 |
| DARE-DC4 Ltd | Other services | 2026 |
| Davies Court (Worthing) Limited | Households | 1970 |
| Dbmf Holdings Ltd | Real estate | 2024 |
| Decked TCG Ltd | Wholesale & retail | 2025 |
| Decoded Technologies Limited | Information & communication | 2014 |
| Defend IT Toolbox Technologies Ltd | Professional & scientific | 2025 |
| Dengi Media Ltd | Information & communication | 2021 |
| Denmans Anew Limited | Hospitality | 2016 |
| DG Ventures Ltd | Real estate | 2024 |
| Digby Fine English Ltd | Manufacturing | 2012 |
| Digby Hospitality Limited | Hospitality | 2025 |
| Digby Wine Ltd | Manufacturing | 2012 |
| Digicare UK Ltd | Manufacturing | 2005 |
| Digital Asset Ltd | Information & communication | 2006 |
| Digital Ocean Games Ltd | Information & communication | 2023 |
| DIRECT4CRAFTS Ltd | Wholesale & retail | 2012 |
| DMC Landscapes Limited | Administrative & support | 2008 |
| DMD Vehicle Services Ltd | Wholesale & retail | 2024 |
| Dolphin Court (Bognor Regis) RTM Company Limited | Households | 2016 |
| Dragonfly Natural Skin Care Limited | Wholesale & retail | 2024 |
| Drayman's Mews Limited | Households | 2002 |
| Dropzone Skatepark CIC | Arts & recreation | 2023 |
| Duck and Hide Ltd | Hospitality | 2023 |
| E-Lango.Online Limited | Education | 2021 |
| Eaden Consultancy Ltd | Administrative & support | 2015 |
| East Ocean (Littlehampton) Ltd | Hospitality | 2014 |
| Ebalta Distribution Limited | Wholesale & retail | 2012 |
| Eboni's Beauty Salon Ltd | Other services | 2024 |
| ECJ Swim Limited | Other services | 2025 |
| Ecoliving Manufacturing Ltd | Manufacturing | 2022 |
| Ecoliving Trading Ltd | Wholesale & retail | 2018 |
| Ellerslie House Management Limited | Households | 1999 |
| ELM Dale RTM Company Limited | Households | 2012 |
| Elmcroft Tree Services Ltd | Administrative & support | 2018 |
| Elsaw Court (Residents' Association) Limited | Households | 1962 |
| Emma Victoria Properties Ltd | Construction | 2025 |
| Enable Children - Gail Dubock Limited | Education | 2011 |
| Energy Construction Group Ltd | Construction | 2025 |
| Energy Savings Direct Limited | Professional & scientific | 2007 |
| Enterpride CIC | Administrative & support | 2019 |
| Envolve.Io Ltd | Professional & scientific | 2025 |
| Ertth Limited | Professional & scientific | 2024 |
| Essential Business Services Limited | Administrative & support | 1982 |
| Euyuncare UK Ltd | Wholesale & retail | 2025 |
| Evans Ltd | Construction | 2024 |
| Ex-I Flow Measurement Limited | Manufacturing | 2006 |
| Excel Properties Limited | Construction | 2014 |
| EXP Holdings Limited | Information & communication | 2026 |
| Expert Signs Limited | Manufacturing | 2001 |
| Express Yourself Equestrian Ltd | Wholesale & retail | 2023 |
| Fairlight Capital Limited | Professional & scientific | 2014 |
| Fairmount Hotel Limited | Hospitality | 2000 |
| Fame Productions Ltd | Information & communication | 2020 |
| Fargro Home & Garden Limited | Wholesale & retail | 1970 |