| &Inc Limited | Professional & scientific | 2017 |
| 1 to 6 West Court Management Company Limited | Households | 1991 |
| 10 - 11 Chester Street (Freehold) Limited | Real estate | 2011 |
| 10 Carew Road Eastbourne Residents Association Limited | Households | 2014 |
| 1017 Property Group Ltd | Real estate | 2024 |
| 1066 Construction Ltd | Construction | 2016 |
| 1066 First AID Training Ltd | Education | 2011 |
| 11 Cloudesley Road Right to Manage Company Limited | Other services | 2010 |
| 116 Mount Pleasant Road Lewisham Limited | Real estate | 2015 |
| 12THFRET Ltd | Manufacturing | 2008 |
| 13 Bedfordwell Road RTM Company Limited | Households | 2026 |
| 186 ISO Consultancy Ltd | Information & communication | 2016 |
| 2 Ringmer Road Seaford Freehold Company Limited | Households | 2022 |
| 21 Napier Place Management Company Limited | Real estate | 2006 |
| 23RD Century Ltd | Arts & recreation | 2022 |
| 24GG Limited | Administrative & support | 2024 |
| 27 Clifton Road Limited | Real estate | 2019 |
| 28 Old Steine Limited | Extraterritorial | 2017 |
| 2EA Consulting Limited | Administrative & support | 2011 |
| 33 DE LA Warr Road Residence Company Limited | Real estate | 2008 |
| 350 Air Limited | Administrative & support | 2016 |
| 350 Consulting Limited | Information & communication | 2022 |
| 3540 Limited | Administrative & support | 2017 |
| 360 Digital Services Limited | Professional & scientific | 2026 |
| 360 DS Ltd | Professional & scientific | 2022 |
| 3J7 Limited | Financial services | 2024 |
| 4 Wards Property Lettings Limited | Real estate | 2022 |
| 43-44 Sussex Square Brighton (Freehold) Limited | Households | 2024 |
| 47 Upperton Limited | Construction | 2025 |
| 4LOWNDES Limited | Real estate | 2021 |
| 4MS Construction Services Limited | Other services | 2007 |
| 5 Highlands Gardens Management Limited | Real estate | 2003 |
| 5 Star Protect Limited | Information & communication | 2018 |
| 7 Hartfield Road RTM Company Limited | Households | 2019 |
| 808 Property Limited | Extraterritorial | 2014 |
| 847847 Taxis Limited | Transport & logistics | 2014 |
| A & K Services Sussex Limited Limited | Construction | 2014 |
| A & O Carpentry & Construction Limited | Manufacturing | 2024 |
| A & S Services (Hastings) Limited | Administrative & support | 2002 |
| A B Mobility (Sussex) Limited | Wholesale & retail | 2010 |
| A Chamberlain Medical Ltd | Health & social care | 2021 |
| A CUT Above Unisex Salon Ltd | Other services | 2023 |
| A F Properties (Sussex) Limited | Construction | 2006 |
| A H Carpentry, Joinery and Construction Ltd | Construction | 2015 |
| A J N Brickwork Limited | Construction | 2007 |
| A Mackay Properties Limited | Real estate | 2021 |
| A MC Rail Safety Limited | Education | 2014 |
| A Touch of Gentleness CIC | Health & social care | 2021 |
| A&B Home to School Ltd | Transport & logistics | 2020 |
| A&C Fencing & Gates Limited | Administrative & support | 2020 |
| A&G Property Mngmt Limited | Households | 2026 |
| A&T Ralph Holdings Ltd | Households | 2023 |
| A.M MOT and Service Centre Ltd | Wholesale & retail | 2026 |
| A.P.A Heating Ltd | Construction | 2024 |
| A1 People Limited | Administrative & support | 2006 |
| AB Carpentry & Joinery London Ltd | Manufacturing | 2021 |
| AB Tree & Landscapes Ltd | Administrative & support | 2024 |
| Abacus Solutions Development Ltd | Information & communication | 2006 |
| Abacus Solutions Management Ltd | Information & communication | 2014 |
| Abbey Close Residents Group Ltd | Households | 2025 |
| Abbots Lodge (Eastbourne) Limited | Households | 1995 |
| Abingdon Nominee Limited | Real estate | 2015 |
| Abinger Homes Limited | Extraterritorial | 2019 |
| Able Builders (Sussex) Limited | Construction | 2005 |
| Above and Beyond Contracts Ltd | Transport & logistics | 2017 |
| Abto Autos Ltd | Wholesale & retail | 2019 |
| Abundant Holdings Limited | Financial services | 2026 |
| AC Barker Developments Limited | Construction | 2003 |
| AC South Ltd. | Construction | 2023 |
| Acartos Ltd | Extraterritorial | 2011 |
| Accounts Direct Ltd | Professional & scientific | 2025 |
| Ace Building Solutions (SE) Ltd | Construction | 2023 |
| Ace Carpentry Services Ltd | Construction | 2014 |
| Ace Combined Services Limited | Construction | 2023 |
| Ace Designer Homes Limited | Construction | 2020 |
| Ace Hygiene Supplies Limited | Wholesale & retail | 1996 |
| Acearetrofit Property Limited | Administrative & support | 2014 |
| Acetech Services Limited | Construction | 2008 |
| ACJ Consultants Limited | Other services | 2017 |
| Aclc Property Services Ltd | Information & communication | 2017 |
| Acorn Countryside Services Ltd | Construction | 2019 |
| Acorn Property Investments Limited | Real estate | 2014 |
| Acorn Sussex Limited | Administrative & support | 2002 |
| Acorns Education Group Ltd | Wholesale & retail | 2024 |
| Acreditus (UK) Limited | Hospitality | 2015 |
| ACT Conveyance Tracking Limited | Information & communication | 2025 |
| Action Enviro Limited | Water & waste | 2003 |
| Action IT Support Limited | Other services | 2011 |
| AD Alta Learning Limited | Professional & scientific | 2007 |
| Adam James Financial Services Limited | Professional & scientific | 2016 |
| Adam James Property Management Limited | Real estate | 2017 |
| Adeptis Holdings Limited | Financial services | 2019 |
| Adham Limited | Real estate | 2019 |
| Adham Properties Limited | Real estate | 2019 |
| Adhd Chatter Limited | Information & communication | 2024 |
| Adlip Ltd | Administrative & support | 2015 |
| Adrian Gurr Surveys Ltd | Professional & scientific | 2015 |
| Adrians Cleaning Services Limited | Administrative & support | 2013 |
| ADS Car Care Ltd | Wholesale & retail | 2017 |
| ADS Electrics Ltd | Construction | 2021 |