| 1-24 Kings Well Court (Seaford) Management Co. Ltd | Households | 1998 |
| 1-38 Telford Court Residents Limited | Households | 1993 |
| 10 Cavendish Place Eastbourne Limited | Households | 2024 |
| 10 Esplanade RTM Company Limited | Households | 2016 |
| 10 Wilbury Gardens (Hove) Limited | Households | 2008 |
| 11599403 Ltd | Information & communication | 2018 |
| 12 Douglas Avenue Management Company Ltd | Households | 2022 |
| 17 Esplanade Limited | Households | 2018 |
| 1ST Rate Aerials and Satellites Ltd | Information & communication | 2012 |
| 2 to 7 Antigua Close RTM Company Limited | Households | 2015 |
| 20 Claremont Road Limited | Households | 2023 |
| 24 Hour Electrical Ltd | Construction | 2019 |
| 27 Montpelier Street (Property) Ltd | Households | 2023 |
| 27, Upper Bridge Road Management Limited | Households | 1980 |
| 3 Akhis Ltd | Hospitality | 2025 |
| 3 Lewes Road Residents Limited | Households | 1991 |
| 32 Esplanade Residents Limited | Health & social care | 2001 |
| 39 Claremont Road RTM Company Limited | Households | 2021 |
| 39-41 Sutton Road Seaford RTM Company Limited | Households | 2024 |
| 40 Sutton Drove Ltd | Households | 2024 |
| 41 Sussex Square (Brighton) Limited | Households | 2003 |
| 45 Broad Street Ltd | Households | 2025 |
| 48 Ferry Road Limited | Households | 2022 |
| 4EVER Fit Limited | Wholesale & retail | 2025 |
| 4TFY Fitness Ltd | Wholesale & retail | 2026 |
| 5 Connaught Road Limited | Real estate | 2015 |
| 555 Cleaning Limited | Administrative & support | 2019 |
| 64 Dane Road Limited | Households | 2013 |
| 67 Pevensey Road (Eastbourne) Limited | Households | 2021 |
| 7 & 9 Granville Road (Eastbourne) Limited | Households | 2011 |
| 7 Goldstone Villas Ltd | Households | 2023 |
| 8 Braybrooke Terrace Ltd | Real estate | 2016 |
| 8 Pelham Place RTM Company Limited | Households | 2024 |
| A M Bower Building Contractors Ltd | Construction | 2016 |
| A Milne Building Construction Ltd | Construction | 2016 |
| A R Welding Ltd | Construction | 2022 |
| A T W Clearances Limited | Water & waste | 2019 |
| A(I)Cademic Ltd | Information & communication | 2024 |
| A2Z Sussex Ltd | Wholesale & retail | 2024 |
| Abisti Ltd | Information & communication | 2008 |
| Abode Developments Ltd | Real estate | 2022 |
| Abode Partnership Ltd | Real estate | 2022 |
| Abode Rentals Ltd | Real estate | 2022 |
| Acis IT Ltd | Information & communication | 2012 |
| Acos Group Limited | Real estate | 2025 |
| Acuteable Ltd | Information & communication | 2011 |
| Adept Abodes Ltd | Real estate | 2023 |
| Adept Sussex Limited | Construction | 2020 |
| Advance Equine Limited | Wholesale & retail | 2021 |
| Advanced Building Solutions Ltd | Construction | 2024 |
| Advanced Procurement Limited | Professional & scientific | 2008 |
| Adventures at Sea Ltd | Education | 2013 |
| Aesthetics Avenue Academy Limited | Education | 2026 |
| Aesthetics Avenue Limited | Other services | 2022 |
| Ageless Medical Clinic Ltd | Health & social care | 2018 |
| Air Premier Ltd | Hospitality | 2020 |
| Akoya Investments Ltd | Construction | 2005 |
| Albany House (Seaford) Residents Company Limited | Households | 2010 |
| Alderworks Ltd | Arts & recreation | 2014 |
| Aliumm Ltd | Wholesale & retail | 2022 |
| Allan and Atwood Limited | Real estate | 1938 |
| Allcott-Wells Electrical Ltd | Construction | 2004 |
| Allegria Court Management Company Limited | Households | 2008 |
| Allied Atlantic Property Limited | Construction | 2019 |
| Alpha RD Construction Ltd | Construction | 2025 |
| Ambers Care Ltd | Administrative & support | 2025 |
| Amery Property Holdings Ltd | Real estate | 2016 |
| Amie's Kitchen Ltd | Hospitality | 2015 |
| Andy Anderson Locksmith Ltd | Administrative & support | 2022 |
| Andy Inc Limited | Professional & scientific | 2025 |
| ANN Pettengell Gold Helm Ltd | Professional & scientific | 1998 |
| Apogee Foods Ltd | Hospitality | 2024 |
| Appleby Cleminson Ltd | Transport & logistics | 2023 |
| Aqua Elite Swim Academy Ltd | Education | 2025 |
| Arch & TED Properties Limited | Real estate | 2022 |
| Around a Pound (UK) Limited | Wholesale & retail | 2009 |
| Artifact Armoury Ltd | Manufacturing | 2025 |
| Arts & Crafts Enterprises Ltd | Education | 2024 |
| Aruka Care Ltd | Health & social care | 2023 |
| Ashworks Media Ltd | Information & communication | 2016 |
| ASK Trans Ltd | Transport & logistics | 2019 |
| Askchris Limited | Information & communication | 2006 |
| Aspen Park (Copthorne) Management Company Limited | Households | 2000 |
| Atalaia Limited | Real estate | 2024 |
| ATW BIN Hire Ltd | Water & waste | 2022 |
| ATW Property Ltd | Real estate | 2026 |
| ATW Recycling Ltd | Water & waste | 2025 |
| Auto & Valeting Centre Ltd | Wholesale & retail | 2026 |
| Avian Harmony Limited | Manufacturing | 2025 |
| Aviation Contract Solutions 2012 Limited | Real estate | 2012 |
| Aviemore Landscapes Ltd | Other services | 2015 |
| Awesome 4 Business Limited | Professional & scientific | 2020 |
| B M Wells Upholstery Limited | Other services | 2012 |
| B N Blinds & Curtains Ltd | Wholesale & retail | 2015 |
| B.C. Networking Limited | Information & communication | 1998 |
| B100 Limited | Extraterritorial | 2006 |
| Barbering Club Ltd | Other services | 2024 |
| Barlow Cleaning Services Ltd | Administrative & support | 2018 |
| Basic Kids Co Ltd | Wholesale & retail | 2019 |
| Baslow Court (Eastbourne) Management Company Limited | Households | 2013 |