| Breathe Spatial Design Ltd. | Professional & scientific | 2022 |
| Brickwise Sussex Limited | Construction | 2023 |
| Bridgebrook House Ltd | Real estate | 2014 |
| Bridie Taylor Ltd | Professional & scientific | 2024 |
| Briggs & Sanger Limited | Professional & scientific | 2014 |
| Bright Expeditions Limited | Education | 2018 |
| Brighton Mews Developments Limited | Construction | 2011 |
| Brighton Plastering & Construction Services Ltd | Construction | 2025 |
| Brighton Plastering and Building Services Ltd. | Construction | 2024 |
| Brightview Lofts Limited | Construction | 2013 |
| Broadbridge Property & Media Ltd | Professional & scientific | 2018 |
| Brown & Co Plastering Ltd | Construction | 2003 |
| Bruynzeel Storage Systems Limited | Manufacturing | 1984 |
| BSW Electrical Limited | Construction | 2016 |
| BTL Precision-Uk Ltd | Manufacturing | 2021 |
| Bubble Car Valeting Ltd | Other services | 2012 |
| Bucknall Trading Ltd | Wholesale & retail | 2023 |
| Buckswood Grange Flat Management Limited | Real estate | 2003 |
| Buckswood Grange Rent Charge Management Limited | Real estate | 2003 |
| Buddys Food Limited | Hospitality | 2016 |
| Builders West Sussex Ltd | Construction | 2020 |
| Building Blocks Therapy Ltd | Health & social care | 2021 |
| Bullfrog Limited | Information & communication | 2018 |
| Buon Appetito Brother Ltd | Hospitality | 2017 |
| Burch Surveying Services Limited | Construction | 2006 |
| Burdett Farming Ltd | Agriculture & fishing | 2013 |
| Burgess Hill Barbers & Grooming Ltd | Other services | 2026 |
| Burgess Hill Bonfire Society Limited | Other services | 1998 |
| Burgess Hill Business Parks Association Limited | Other services | 2004 |
| Burgess Hill Community Partnership CIC | Administrative & support | 2012 |
| Burgess Hill Dental Care Limited | Health & social care | 2010 |
| Burgess Hill Kebab House Ltd | Hospitality | 2023 |
| Burgess Hill Rugby Football Club Ltd | Arts & recreation | 2013 |
| Burgess Hill School for Girls Company | Education | 1934 |
| Burgess Hill Town F C Group Limited | Arts & recreation | 2023 |
| Burgess Hill Town F C Juniors Limited | Arts & recreation | 2024 |
| Burgess Hill Town Football Club Limited | Arts & recreation | 2000 |
| Bushido FOX Ltd | Real estate | 2025 |
| Business Brewing Limited | Administrative & support | 2026 |
| Business Development & Marketing Ltd | Professional & scientific | 2004 |
| Busy Hands Ltd | Administrative & support | 2009 |
| BYS Fitness Limited | Arts & recreation | 2022 |
| C & H Gutters Ltd | Administrative & support | 2022 |
| C.N.D.B Computer Services Limited | Information & communication | 1996 |
| C.P.J. Field & Co. Limited | Other services | 1994 |
| C4L Laboratory Services Ltd | Other services | 2002 |
| C4L Property Services LLP | | 2017 |
| Cabspark Limited | Other services | 2012 |
| CAE STS Limited | Transport & logistics | 2006 |
| Cairovan Limited | Hospitality | 2023 |
| Calisan Refurbishments Ltd | Construction | 2018 |
| Callexcept Limited | Extraterritorial | 1999 |
| Campersales Limited | Wholesale & retail | 2008 |
| Cannelle Ltd | Hospitality | 2026 |
| Canterbury Court Management Company (Southsea) Limited | Households | 2013 |
| Caramilea Devops Limited | Construction | 2025 |
| Carbon and Steel Ltd | Manufacturing | 2020 |
| Carboncable Ltd | Extraterritorial | 2024 |
| Caretouch Limited | Health & social care | 2018 |
| Cargeons Ltd | Hospitality | 2018 |
| Carillon House (Eastbourne) Limited | Households | 2010 |
| Carnabys Limited | Real estate | 2001 |
| Carpentry 4 Homes Ltd | Construction | 2014 |
| Carter Lawson Limited | Professional & scientific | 2020 |
| Casa Mill Ltd | Hospitality | 2016 |
| Casper Creative Limited | Information & communication | 2019 |
| Castleman & Dean Network Ltd | Other services | 2010 |
| Castlemans Limited | Real estate | 2014 |
| Catalyst Trading Limited | Professional & scientific | 1999 |
| CC Pro Limited | Administrative & support | 2017 |
| CD Electrical (South) Ltd | Construction | 2021 |
| Cdng Ltd | Real estate | 2025 |
| Cellprp Ltd | Health & social care | 2021 |
| CELLS4LIFE Group LLP | | 2010 |
| CELLS4LIFE IP Limited | Other services | 2011 |
| Central Services (South) Holdings Limited | Financial services | 2023 |
| Central Services (South) Limited | Manufacturing | 1997 |
| Central Sussex Construction and Electrical Limited | Construction | 2015 |
| Cereva Health Limited | Information & communication | 2026 |
| Certa Ltd | Wholesale & retail | 2016 |
| Certa MPS Ltd | Wholesale & retail | 2015 |
| Cfd-Collective Ltd | Information & communication | 2024 |
| Cfsussex Ltd | Arts & recreation | 2014 |
| CH Sports Management Ltd | Arts & recreation | 2024 |
| Change Formation (Executive Development) Limited | Other services | 2013 |
| Chantler and Garner Limited | Construction | 2014 |
| Chapelfields (Cuckfield) Management Limited | Households | 1995 |
| Charisma Sales & Marketing Limited | Administrative & support | 2015 |
| Charles Avenue Burgess Hill Management Company Limited | Real estate | 2008 |
| Charter Gate Management Company (Haywards Heath) Limited | Households | 2000 |
| Chatsworth Court (Brighton) Residents Association Limited | Households | 1959 |
| Chaudhari Burger Limited | Hospitality | 2022 |
| Checkacare Limited | Public administration | 2025 |
| Chequers Court BS Ltd | Real estate | 2023 |
| Chester Berry Limited | Wholesale & retail | 2023 |
| Chevron Publishing Limited | Information & communication | 1999 |
| Chewter Estates Ltd | Real estate | 2010 |
| CHI Analytics UK Ltd | Information & communication | 2021 |
| Chicken Craft Ltd | Wholesale & retail | 2020 |
| Chloe's Nails Burgess Hill Ltd | Other services | 2025 |