| 1 Anglesea Terrace Limited | Households | 2015 |
| 1-3 Coach House Mews (Freehold) Limited | Households | 2024 |
| 11 Eleven Media Ltd | Professional & scientific | 2014 |
| 118 HH Limited | Financial services | 2015 |
| 12MT Social Ltd | Professional & scientific | 2021 |
| 130 High Street Uckfield Residential Management Company Limited | Real estate | 2022 |
| 15 ST Georges Terrace Brighton Limited | Real estate | 2009 |
| 18 & 19 Atlingworth Street Limited | Households | 2017 |
| 2 Mill Drove Management Company Limited | Households | 2006 |
| 22 Bonchurch Road Freehold Limited | Households | 2018 |
| 22 Farm Road Maintenance RTM Company Limited | Real estate | 2014 |
| 25 London Road RTM Company Limited | Households | 2017 |
| 26 Newtown Limited | Households | 2010 |
| 26 Parliament Hill Management Company Limited | Households | 2008 |
| 2K'S Engineering Limited | Manufacturing | 2018 |
| 3-D Architecture Limited | Professional & scientific | 2004 |
| 30 Islingword Road Limited | Real estate | 2001 |
| 390 New Cross Limited | Real estate | 2016 |
| 46 Upperton Road Management Company Limited | Real estate | 2002 |
| 49 Meads Road Management RTM Company Limited | Households | 2017 |
| 4B Packaging Limited | Administrative & support | 2023 |
| 5 Ashdown Uckfield Limited | Wholesale & retail | 2012 |
| 5 Eaton Gardens Ltd | Real estate | 1997 |
| 54-56 Compton Street Limited | Households | 2005 |
| 61 ST. Andrews Road Limited | Extraterritorial | 2008 |
| 8-14 Walnut Park Freehold Company Limited | Real estate | 2015 |
| 80151 Locomotive Company Limited(The) | Manufacturing | 1987 |
| 91 Westbourne Street Limited | Administrative & support | 2001 |
| A C Plastering and Construction Ltd | Construction | 2022 |
| A&B Drainage Solutions Ltd | Water & waste | 2022 |
| A-Ka'Y Music Limited | Manufacturing | 2012 |
| A. B Howells Limited | Professional & scientific | 2014 |
| A.C. Sheetmetal Limited | Manufacturing | 2004 |
| A.G. Building Services Limited | Construction | 2015 |
| A.R.F. Barnard Limited | Real estate | 2004 |
| A.W Projects & Programmes Ltd | Information & communication | 2023 |
| A.Z.T.A. Cleaning Products Ltd. | Administrative & support | 2017 |
| A1 (Sussex) Limited | Wholesale & retail | 1999 |
| Abs-Fmcg Ltd | Administrative & support | 2016 |
| Academic Board Ltd | Professional & scientific | 2024 |
| Academica Ltd | Education | 2023 |
| Academy of Hair Uckfield Ltd | Other services | 2017 |
| Academy of Play and Child Psychotherapy Limited | Health & social care | 1998 |
| Accipio Solutions Limited | Administrative & support | 2008 |
| Accounting NOW Limited | Professional & scientific | 2018 |
| Ace Carpentry & Building Limited | Construction | 1999 |
| Acouna Limited | Professional & scientific | 2012 |
| Action Your Potential Ltd | Education | 2019 |
| Adam Jeffery Property Ltd | Real estate | 2025 |
| Addagrip Terraco Ltd | Manufacturing | 1980 |
| Aditup Ltd | Professional & scientific | 2020 |
| Advance Tests Ltd | Health & social care | 2024 |
| Advanced Roofing Services Limited | Construction | 1993 |
| Advanced Test Equipment Limited | Manufacturing | 2022 |
| Adventures by Ltd | Administrative & support | 2021 |
| AE (Uckfield) Property Limited | Real estate | 2018 |
| Aegean Investments Limited | Households | 2009 |
| Aenj Consulting Limited | Hospitality | 2017 |
| Aerodynamic Test Equipment Limited | Manufacturing | 2010 |
| Aerofabrique Limited | Manufacturing | 1999 |
| Aesir Space Limited | Financial services | 2025 |
| Aev&D Ltd | Professional & scientific | 2025 |
| Affinity Select Insurance Services Limited | Financial services | 1998 |
| AFR Hope Building Services Limited | Construction | 2017 |
| AFS Catalyst Ltd | Professional & scientific | 2019 |
| After Eden Productions Limited | Information & communication | 2018 |
| Agaso Limited | Wholesale & retail | 2016 |
| Agfay Transport Limited | Transport & logistics | 2023 |
| Agim Ltd | Professional & scientific | 2015 |
| AGL Scaffold Ltd | Construction | 2016 |
| Agrie Mach Limited | Wholesale & retail | 1976 |
| Agro Sussex Limited | Hospitality | 2024 |
| Ahmed Motor Service & Repair Ltd | Wholesale & retail | 2017 |
| Ahun Ltd | Transport & logistics | 2020 |
| Ai-Recruiter Hrtech Ltd. | Financial services | 2025 |
| AIM to Claim Europe Limited | Financial services | 2016 |
| Air the Film Ltd | Information & communication | 2012 |
| Aircraft Independent Records Limited | Information & communication | 1994 |
| AL & Partner Trade Ltd | Transport & logistics | 2012 |
| Alakat Publishing Limited | Information & communication | 2011 |
| Albahard Metals Limited | Construction | 2025 |
| ALL Round Accounting Limited | Professional & scientific | 2011 |
| Allan Beattie Limited | Professional & scientific | 2026 |
| Alled Limited | Real estate | 2025 |
| Allfiliate Ltd | Information & communication | 2016 |
| Allied Pharmacy Limited | Wholesale & retail | 2003 |
| Allied Waste Management Ltd | Water & waste | 2005 |
| Allin Fans Ltd | Financial services | 2025 |
| Alpha Femtech UK Limited | Wholesale & retail | 2025 |
| Alpine View Management Company Limited | Households | 1992 |
| Alport Management Services Limited | Professional & scientific | 1995 |
| ALT - FOR4W Ltd | Information & communication | 2012 |
| Alvo Consulting Ltd | Information & communication | 2023 |
| AM98 Ltd | Professional & scientific | 2022 |
| Ambra Grove Limited | Professional & scientific | 2025 |
| AMD Plumbing and Heating Ltd | Construction | 2019 |
| Ameauto Ltd | Wholesale & retail | 2016 |
| Aname United Ltd | Arts & recreation | 2019 |
| Anderida House Limited | Real estate | 2018 |
| Andreas Decor Ltd | Construction | 2020 |