| 11 Oxford Road (Worthing) Limited | Households | 2012 |
| 12 Bute Street (Management) Limited | Real estate | 2005 |
| 12 King's Gardens Limited | Households | 1987 |
| 13/14 Kings Gardens (Hove) Limited | Households | 1999 |
| 14 Compton Road Freehold (Brighton) Limited | Households | 2016 |
| 16 Southfields Road Residents Association Ltd. | Households | 2003 |
| 17 Western Road RTM Company Limited | Households | 2014 |
| 176 Investment Group Limited | Financial services | 2025 |
| 1813 Furniture & Kitchens Limited | Manufacturing | 2022 |
| 19NINETY3 Ltd | Manufacturing | 2025 |
| 22 Freeholders Limited | Households | 1999 |
| 23 Clifton Road (Littlehampton) Ltd | Real estate | 2009 |
| 24 East Street Ltd | Real estate | 2025 |
| 24 Norfolk Road Limited | Real estate | 2024 |
| 28 Tech Ltd | Wholesale & retail | 2023 |
| 2K Detailing Ltd | Administrative & support | 2025 |
| 3 OFC Ltd | Hospitality | 2026 |
| 3 S.T. Limited | Households | 1987 |
| 30 Dorset Gardens (Brighton) RTM Company Limited | Real estate | 2010 |
| 30 Norfolk Road Limited | Households | 2006 |
| 32 ST Johns Road (Eastbourne) Management Company Limited | Households | 2003 |
| 34 & 35 the Grangeway (Rustington) Freehold Limited | Households | 2013 |
| 35 Hatchlands Road Freeholders Limited | Households | 2024 |
| 36 Exposures Limited | Real estate | 2020 |
| 3D Games Shop Ltd | Manufacturing | 2024 |
| 3N Group Limited | Arts & recreation | 2007 |
| 41 South Terrace Residents Association Limited | Households | 1997 |
| 43 Nightingale Lane Management Company Limited | Households | 2006 |
| 4LGOLF Ltd | Wholesale & retail | 2025 |
| 5 Cats One Pixel Ltd | Professional & scientific | 2026 |
| 5 Western Road Littlehampton Freehold Ltd | Administrative & support | 2019 |
| 50 Norfolk Road Management Company Limited | Real estate | 2000 |
| 53 Norfolk Road RTM Company Limited | Households | 2021 |
| 58 Norfolk Road Ltd | Households | 2013 |
| 59 Arundel Road Littlehampton (Residents Company) Limited | Households | 1990 |
| 59 South Terrace Residents Association Limited | Households | 1996 |
| 60 Norfolk Road Limited | Households | 2022 |
| 61 Linden Road Ltd | Households | 2019 |
| 63 South Terrace Residents Limited | Households | 2004 |
| 66 South Terrace Limited | Households | 1998 |
| 68 Clyde Road Brighton Limited | Households | 2004 |
| 68 South Terrace Limited | Real estate | 2025 |
| 74 South Terrace Resident Association Limited | Households | 1994 |
| 75/76 Marina Management Limited | Households | 2010 |
| 77 Bayford Road Ltd | Households | 2008 |
| 786 Kabir Ltd | Hospitality | 2025 |
| 8 Clifton Terrace (Brighton) Management Company Limited | Households | 1990 |
| 8 Eversfield Road Limited | Households | 1987 |
| 8000AND1 Ltd | Professional & scientific | 2022 |
| 82 South Terrace Limited | Households | 2003 |
| 83-89 Upper Bognor Road RTM Company Limited | Households | 2024 |
| 86 South Terrace (Littlehampton) Freehold Limited | Households | 2023 |
| 9 Group Construction Ltd | Construction | 2026 |
| 90 Ulverscroft Road Limited | Households | 2020 |
| 94 Ventures Ltd | Real estate | 2025 |
| @London Digital Limited | Professional & scientific | 2019 |
| A and D Fieldproperties LLP | | 2016 |
| A Baker Construction & SON Ltd | Construction | 2025 |
| A C Tucker & Co Limited | Professional & scientific | 2006 |
| A Parsons Electrical Ltd | Construction | 2017 |
| A RAY of Colour Ltd | Construction | 2020 |
| A Star Danced Limited | Arts & recreation | 2023 |
| A Team Storage Solutions Ltd | Construction | 2020 |
| A&J Reborn Furniture Ltd | Manufacturing | 2021 |
| A&S Food and Drink Ltd | Wholesale & retail | 2019 |
| A-Grade Training Services Ltd | Education | 2013 |
| A.A.C. (Southern) Ltd | Construction | 2000 |
| A.D.R. (Sussex) Limited | Wholesale & retail | 2001 |
| A.R.D Gardens Ltd | Administrative & support | 2023 |
| A1 Carbon Fibre Services Limited | Manufacturing | 2024 |
| A1 CARE-4-CARS Ltd. | Wholesale & retail | 2004 |
| Aattitude Ltd | Real estate | 1999 |
| AB GEO Ltd | Real estate | 2019 |
| ABC Worksafe Limited | Health & social care | 2009 |
| Abingdon Lodge Residents Limited | Real estate | 2022 |
| Able Kicks Ltd | Education | 2025 |
| Absolute Auto Care Limited | Administrative & support | 2019 |
| Absolute Toninks Limited | Wholesale & retail | 2004 |
| Abyss Scuba Ltd | Wholesale & retail | 2025 |
| Abyss Scuba School CIC | Wholesale & retail | 2024 |
| Abzp Limited | Hospitality | 2023 |
| AC Digital Media Limited | Information & communication | 2007 |
| AC Latham Limited | Professional & scientific | 2011 |
| Acare Solutions Limited | Health & social care | 2018 |
| Accession Project Services Limited | Construction | 2017 |
| Ace Clad Limited | Construction | 2021 |
| Acfi Care Ltd | Professional & scientific | 2026 |
| Acopia Group Ltd | Wholesale & retail | 2014 |
| Acopia Holdings Ltd | Wholesale & retail | 2011 |
| Acopia Investments Ltd | Financial services | 2018 |
| Acopia Ltd | Extraterritorial | 2014 |
| Acorn Industrial Components Limited | Wholesale & retail | 1979 |
| Acorn Roots Ltd | Real estate | 2024 |
| ACTIV8 for Kids Limited | Education | 2015 |
| ACTIV8 Health for Living CIC | Education | 2017 |
| Active Product Design Limited | Professional & scientific | 2007 |
| Acton's Motor Company Limited | Wholesale & retail | 2009 |
| Actpsy Consulting Limited | Professional & scientific | 2009 |
| Actual Apparel Limited | Wholesale & retail | 2021 |
| Adam Parsons Entertainment Ltd | Arts & recreation | 2023 |