| 1 to 8 Millbrook RTM Company Limited | Households | 2025 |
| 10 Douglas Avenue Limited | Households | 2007 |
| 101 Open Door C.I.C. | Health & social care | 2022 |
| 1ST Class Travel Management Limited | Other services | 2020 |
| 1ST Waterside Limited | Manufacturing | 2001 |
| 1ST Waterside Properties Limited | Real estate | 2004 |
| 240 Volts Ltd | Construction | 2008 |
| 25 ST Leonard's Road Management Ltd | Real estate | 2002 |
| 29 Grimston Gardens Limited | Households | 1996 |
| 3 Phase Electrical Installations Ltd | Construction | 2020 |
| 33 Ormonde Road Residents Association Ltd | Households | 2022 |
| 359. Exclusive Limited | Other services | 2025 |
| 359. Sports Management Limited | Other services | 2025 |
| 359.TENNIS Limited | Other services | 2024 |
| 360 Mindset Ltd | Health & social care | 2024 |
| 3DW Limited | Professional & scientific | 2003 |
| 4 Marine Parade Limited | Households | 2000 |
| 44 Albert Road Management Company Limited | Households | 1996 |
| 44 DRY Hill Park Road (Management) Company Limited | Extraterritorial | 1992 |
| 4X4 Motors Ltd | Wholesale & retail | 2020 |
| 5, West Cliff Gardens Management Company Limited | Households | 2011 |
| 6 Marine Parade Limited | Households | 2016 |
| 7 Douglas Avenue Management Company Limited | Households | 2000 |
| 9 to 12 Millbrook RTM Company Limited | Households | 2025 |
| 93 Seabrook Road Management Company (Hythe) Limited | Households | 2025 |
| A B Corporate Services Limited | Professional & scientific | 2022 |
| A Morris Design and Art Direction Limited | Professional & scientific | 2016 |
| A Star Maintenance Contractors Limited | Construction | 2016 |
| A-Z Renovation Bvba Limited | Professional & scientific | 2019 |
| A.C.I. Engineering Limited | Manufacturing | 2000 |
| A.E.M. Property Developers Limited | Real estate | 1960 |
| A.H Ballard Ltd | Real estate | 2026 |
| A.I. Developments Ltd | Real estate | 2003 |
| A.R.T. Consultancy Limited | Professional & scientific | 2000 |
| A.Tabrizi Limited | Information & communication | 2021 |
| AA Engineering Group Holding Limited | Other services | 2022 |
| AA Engineering Group IBC Limited | Other services | 2022 |
| AAI Sian Beheer Limited | Other services | 2025 |
| AAI Sian Limited | Other services | 2025 |
| Abbotstones Accountants Limited | Professional & scientific | 2018 |
| ABC Holdings Limited | Other services | 1999 |
| ABC Holiday Extras Limited | Extraterritorial | 1994 |
| Abcontractors (Kent) Limited | Construction | 2024 |
| Ability Sun Limited | Other services | 2017 |
| Ace Scaffold Hire Limited | Administrative & support | 2025 |
| Achieve Business Solutions Limited | Administrative & support | 2010 |
| Achterhoek Fourage IBC Limited | Other services | 2025 |
| ADT Construction Services Ltd | Construction | 2025 |
| Advancedfunding Limited | Other services | 2025 |
| Advectio Limited | Other services | 2026 |
| Adventure Bike Collective Ltd | Arts & recreation | 2025 |
| Aerial Image and Recon Ltd. | Construction | 2020 |
| AF Management Services Ltd | Real estate | 2018 |
| AF Marketing Limited | Financial services | 2016 |
| AFC International Limited | Other services | 2025 |
| Afiyah Services Company Beheer Limited | Other services | 2025 |
| Afiyah Services Company Limited | Other services | 2025 |
| AGE UK Hythe, Lyminge and Ashford | Health & social care | 2008 |
| Agentic Asset & Advisory Ltd | Financial services | 2026 |
| Agentycs Limited | Information & communication | 2024 |
| Agos Automatic Gate Opener Systems Limited | Professional & scientific | 2014 |
| Agostos Limited | Professional & scientific | 2014 |
| Agri Merchants Limited | Other services | 2021 |
| Ahsq Holdings Limited | Construction | 2024 |
| Airlec Systems Ltd | Professional & scientific | 2007 |
| Alcaline Events Limited | Transport & logistics | 2000 |
| Alcaline UK Limited | Transport & logistics | 1993 |
| Aldireco Group IBC Limited | Other services | 2024 |
| ALEXA7 Ltd | Health & social care | 2021 |
| Alexander & Nicholas Limited | Professional & scientific | 1994 |
| Alia Steel Fixing Ltd | Construction | 2014 |
| Alistair Noel Investments Limited | Extraterritorial | 2017 |
| ALL the Decades Interior Design Ltd | Professional & scientific | 2022 |
| Allround International Yachtservice Holding Limited | Professional & scientific | 2019 |
| Allround IT Solutions IBC Limited | Professional & scientific | 2018 |
| Almerius Limited | Other services | 2026 |
| Almerius Partners Limited | Other services | 2026 |
| Alpha Rapid Repair Limited | Wholesale & retail | 2017 |
| Ample Walrus Solutions Limited | Information & communication | 2018 |
| Anderson Accounts Ltd | Professional & scientific | 2017 |
| Andrew Burnett Associates Ltd | Agriculture & fishing | 2013 |
| Andy Tuohy Design Limited | Professional & scientific | 2014 |
| Anikah International Holdings Ltd | Financial services | 2021 |
| Anikah London Ltd | Wholesale & retail | 2021 |
| Annapurna Cottage Ltd | Hospitality | 2026 |
| Anthony Swaine Architecture Limited | Professional & scientific | 2011 |
| Anunnaki Holding Limited | Other services | 2021 |
| Apple Barn Properties Limited | Other services | 2011 |
| Aptumus Ltd | Professional & scientific | 2020 |
| Aptumx Limited | Information & communication | 2020 |
| Aquatech Rubber Limited | Professional & scientific | 1996 |
| Arca Beheer Limited | Other services | 2025 |
| Archaeoptix Limited | Wholesale & retail | 2024 |
| Ardor Business Insight Limited | Information & communication | 2015 |
| Ardor Business Solutions Limited | Professional & scientific | 2013 |
| Ardor Living Space Limited | Real estate | 2015 |
| Ardor Motorsports Limited | Arts & recreation | 2015 |
| Ariadne Residential Ltd | Real estate | 2023 |
| Arian Financial LLP | | 2003 |
| Arista IBC Limited | Other services | 2024 |