| A K Cuts Ltd | Other services | 2024 |
| A L Shand Ltd | Construction | 2025 |
| A Million Dreams Sleepover Ltd | Arts & recreation | 2019 |
| A Plus Care Ltd | Administrative & support | 2014 |
| A Sunshine Company Ltd | Wholesale & retail | 2025 |
| A Wyer Holdings Ltd | Real estate | 2018 |
| A&B Grill House Limited | Hospitality | 2023 |
| A&L Construction Ltd | Construction | 2025 |
| A. Webb Properties Ltd | Real estate | 2025 |
| A.B.P.S. Exhibitions Limited | Other services | 1995 |
| A.G.R Building Ltd | Construction | 2026 |
| A.J. Wilson (East Sussex) Limited | Construction | 1999 |
| Aardvark Limited | Financial services | 2015 |
| Aardvarkcompare.Com Limited | Information & communication | 2016 |
| Aardvarkinsure.Com Limited | Financial services | 2015 |
| Aardy.Com Limited | Information & communication | 2020 |
| Aarpy Limited | Professional & scientific | 2023 |
| Abcd Property Limited | Real estate | 2026 |
| Abel Empire Ltd | Real estate | 2024 |
| Above & Below Building Services Ltd | Construction | 2019 |
| Abpr Ltd | Real estate | 1995 |
| Absolute Professionals Ltd | Administrative & support | 2004 |
| AC Flooring (Bexhill) Limited | Construction | 2018 |
| AC Property Holdings and Investments Ltd | Construction | 2022 |
| Academic Editing Limited | Professional & scientific | 2014 |
| Acorn Building & Decorating Ltd | Construction | 2002 |
| ACS Home Improvements Ltd | Construction | 2020 |
| Active Days Ltd | Wholesale & retail | 2024 |
| Active Days Mobility Ltd | Professional & scientific | 2019 |
| AD Customs Ltd | Transport & logistics | 2023 |
| Adam's Independent MOT Centre Bexhill Ltd | Wholesale & retail | 2016 |
| Adams Brickwork Limited | Construction | 2019 |
| Aden Engineering & Consultancy Ltd | Information & communication | 2020 |
| Adhikola Ltd | Wholesale & retail | 2016 |
| ADS Acquisitions Ltd | Real estate | 2022 |
| Aerosight UAV Ltd | Professional & scientific | 2013 |
| Aesthetics by Victoria Ltd | Other services | 2023 |
| African Overseas Media Limited | Professional & scientific | 2019 |
| Afritrade (Europe) Limited | Extraterritorial | 1994 |
| AGE Diversity Network Ltd | Professional & scientific | 2019 |
| AGH Professional Services Limited | Construction | 2021 |
| AGL Corrosion Ltd | Professional & scientific | 2002 |
| Agora Purchasing Group Ltd | Construction | 2024 |
| Ahkm Leisure Ltd | Administrative & support | 2006 |
| AI Guardian Limited | Other services | 2023 |
| Air Services South Limited | Administrative & support | 2019 |
| AJB Lift Consultancy Limited | Professional & scientific | 2024 |
| AJD Plumbing and Heating Ltd | Construction | 2022 |
| Ajlane Limited | Hospitality | 2022 |
| AJN Plumbing & Heating Limited | Construction | 2003 |
| AK Metalworks Limited | Manufacturing | 2020 |
| Akeso Medic Ltd | Health & social care | 2026 |
| Alan Hurst Engineering Limited | Professional & scientific | 2012 |
| Alban & Wylde Business Consulting Ltd | Professional & scientific | 2024 |
| Alert 2020 Services Limited | Other services | 2011 |
| Alex Brown Real Estate Limited | Professional & scientific | 2013 |
| Alfa Group (UK) Limited | Manufacturing | 2002 |
| Alfie's Arbitrage Ltd | Wholesale & retail | 2026 |
| Alfred Robinson(Builders & Contractors)Limited | Professional & scientific | 1956 |
| Alga Property Company Limited | Real estate | 2012 |
| ALL Aspects Construction Ltd | Manufacturing | 2025 |
| ALL Construction Solutions Limited | Construction | 2025 |
| ALL Roofing Solutions Limited | Construction | 2009 |
| ALL Terrain Camping Ltd | Transport & logistics | 2022 |
| Allanart Ltd | Professional & scientific | 2017 |
| Allysha Limited | Health & social care | 2011 |
| Almond Finance Ltd | Construction | 2005 |
| Alpha Roofing Sussex Ltd | Construction | 2025 |
| Altitude Scaffolding (South East) Limited | Construction | 2020 |
| AM Hawks Consulting Ltd | Professional & scientific | 2018 |
| AM Liners Ltd | Construction | 2024 |
| Amaw Productions Limited | Professional & scientific | 2020 |
| AMB Consultants Ltd | Professional & scientific | 2022 |
| Ambers Rise (Bexhill) Management Company Limited | Households | 2013 |
| Ambibrew Ltd | Wholesale & retail | 2026 |
| AMF Automotive Ltd | Wholesale & retail | 2018 |
| AMG Holdings (South East) Ltd | Financial services | 2024 |
| Amigo Television Limited | Information & communication | 2009 |
| AMM Estates Limited | Real estate | 2017 |
| Anavoq Limited | Information & communication | 2025 |
| Angels MOT & Service Centre Limited | Manufacturing | 2008 |
| Animal Angels Global | Other services | 2009 |
| Anise & Coriander Freehold Limited | Real estate | 2001 |
| Anise & Coriander Management Company Limited | Real estate | 1999 |
| Anneli Ltd | Professional & scientific | 2025 |
| Anova Consulting Ltd | Professional & scientific | 2024 |
| Antonios K Limited | Health & social care | 2014 |
| ANZ Document Solutions Ltd | Professional & scientific | 2024 |
| Apex Development Partners Limited | Construction | 2026 |
| Appleyards Butchers Holdings Limited | Financial services | 2024 |
| Appleyards Butchers Limited | Wholesale & retail | 2005 |
| April Place Residents Association Limited | Households | 2005 |
| Aquilae Holdings Ltd | Water & waste | 2014 |
| Arcade Butchers Limited | Wholesale & retail | 2002 |
| Archery Court Management Company Limited | Households | 1963 |
| Archies Events Ltd | Hospitality | 2010 |
| Ardentallen Limited | Households | 2003 |
| Arfam Investment Company Limited | Financial services | 2024 |
| Arks Homes Limited | Real estate | 2019 |
| Armadillo Safety Limited | Administrative & support | 2012 |