| Christophe Maas Music Ltd. | Arts & recreation | 2016 |
| Classic Brickwork (Portsmouth) Limited | Construction | 2003 |
| Clean Air Zone Cars Ltd | Wholesale & retail | 2023 |
| Clearcut Arts Limited | Arts & recreation | 2017 |
| Clickcover (London) Limited | Financial services | 2010 |
| Cloud&Crunch Ltd | Wholesale & retail | 2025 |
| Coalexander Consultants Ltd | Professional & scientific | 2024 |
| Cobby Aviation Limited | Professional & scientific | 2006 |
| Code Brighton Limited | Information & communication | 2014 |
| Colbyco Engineering Ltd | Professional & scientific | 2010 |
| College Place (Steyning) Management Company Limited | Households | 2007 |
| Colorare Limited | Construction | 2019 |
| Commander Black Ltd | Wholesale & retail | 2014 |
| Commpoint Limited | Information & communication | 2016 |
| Communications Wholesale (Sussex) Limited | Information & communication | 1989 |
| Connected Stories Ltd | Education | 2007 |
| Constantine Real Estate Ltd. | Manufacturing | 2011 |
| Coolrain Construction Limited | Construction | 2002 |
| Cownwy Court Residents Association Limited(The) | Households | 1958 |
| Creative Hall Ltd | Information & communication | 2015 |
| Creative Recruitment Limited | Administrative & support | 1995 |
| Creative Temps Limited | Extraterritorial | 1998 |
| Culturestudio Research Limited | Professional & scientific | 2020 |
| CUT Direct Ltd | Manufacturing | 2023 |
| D & G Contractors Limited | Construction | 2007 |
| D & L Management Services Limited | Financial services | 2012 |
| D E B Construction Solutions Ltd | Construction | 2020 |
| D J L Holdings Limited | Financial services | 2006 |
| D. Wade Electrical Contractors Limited | Energy | 2008 |
| DAK Electrical Ltd | Construction | 2008 |
| DAN Yems Ltd. | Information & communication | 2015 |
| Darin Partners Holdings Ltd | Financial services | 2024 |
| Darin Partners Ltd. | Real estate | 2014 |
| Darren Abrahams Limited | Education | 2010 |
| Darren Barlow Properties Ltd | Real estate | 2006 |
| David Taylor P.M. Limited | Information & communication | 2008 |
| Davinci Capital Limited | Professional & scientific | 2017 |
| DCO Partners Limited | Professional & scientific | 2018 |
| DDE Ltd | Manufacturing | 2023 |
| Dean Thornton Goalkeeping Academy Limited | Arts & recreation | 2019 |
| Dean's Gutters Ltd | Administrative & support | 2012 |
| Devine Interior Solutions Ltd | Construction | 2014 |
| Dillybrook Classic Cars Limited | Wholesale & retail | 2015 |
| DO Maintenance Limited | Manufacturing | 2024 |
| Dorcom Limited | Other services | 1974 |
| Dorton Asbestos Removal Services (SW) Limited | Construction | 2010 |
| Dorton Demolition and Excavation Limited | Construction | 1992 |
| Doug Simmonds Limited | Administrative & support | 2007 |
| Dukebridge Partners Limited | Information & communication | 2005 |
| DW Renewable Energy Limited | Construction | 2011 |
| E. Oak Care Village Limited | Real estate | 2021 |
| East Sussex Construction Services Limited | Construction | 2009 |
| Eastern House (East Sussex) Limited | Households | 1997 |
| Elessar Holdings Ltd | Financial services | 2026 |
| Ellis T C Properties Ltd | Real estate | 2024 |
| Environmental Chemical Resources Limited | Other services | 1996 |
| EO Laundry LLP | | 2023 |
| Equibridge Metrics Ltd | Information & communication | 2025 |
| ES (Brighton) Ltd | Hospitality | 2013 |
| ESC Group Limited | Construction | 2024 |
| Existence Design Ltd | Information & communication | 2024 |
| Expert Cleaning Brighton Ltd | Administrative & support | 2023 |
| F.C.S. Group Fire & Security Limited | Construction | 2020 |
| Fallon Carpentry Limited | Construction | 1997 |
| Famicode Ltd | Information & communication | 2026 |
| Farrell & Co Holdings Limited | Financial services | 2024 |
| Fidi Consulting Ltd | Professional & scientific | 2016 |
| Fifth Elevation Limited | Construction | 2015 |
| Fincentive Ltd | Information & communication | 2024 |
| Fincentria Limited | Information & communication | 2021 |
| Find and Found Limited | Administrative & support | 2021 |
| Finlay Fraser Piano Services Ltd | Other services | 2012 |
| Firing Solutions Limited | Wholesale & retail | 2019 |
| First Rate Decorating Ltd | Construction | 2024 |
| Flat CAP Locations Limited | Information & communication | 2013 |
| Funding Solutions Limited | Financial services | 2009 |
| G M Building Limited | Administrative & support | 2002 |
| G2 Paving & Construction Ltd | Construction | 2015 |
| Gainsford Consulting Ltd | Financial services | 2009 |
| Gary Gill Hairdresser Limited | Other services | 2012 |
| Gary Taylor Associates Limited | Health & social care | 2010 |
| Gasspec Southern Ltd | Construction | 2020 |
| Gatecroft Consultants Limited | Administrative & support | 2003 |
| Gatesmart Property Management Limited | Households | 1988 |
| Gfne Limited | Information & communication | 2020 |
| Gillingham Storage Ltd | Transport & logistics | 2026 |
| Glenside Court Brighton Limited | Households | 2004 |
| Go Yonder Coaching Limited | Other services | 2023 |
| Goldstone Court (Block a) Limited | Households | 2011 |
| Gordon Close Management Co. Limited | Real estate | 1980 |
| Gosling Electrical Ltd | Construction | 2014 |
| Grayburn Hart Ltd | Professional & scientific | 2022 |
| Greenways Sussex Groundworks & Construction Ltd | Construction | 2025 |
| Greg's Sea Enterprises Ltd | Agriculture & fishing | 2020 |
| Gridscout Ltd | Energy | 2025 |
| H2FLOW Plumbing & Heating Ltd | Construction | 2015 |
| Hampers Delicatessen (Hurstpierpoint) Limited | Wholesale & retail | 2006 |
| Hannah England Limited | Arts & recreation | 2010 |
| Harcourt Property Services Limited | Administrative & support | 2019 |
| Hastings Digital Radio CIC | Information & communication | 2023 |