| Allan Court RTM Company Limited | Households | 2011 |
| AM Electrical Contractors Ltd | Construction | 2020 |
| Amador Investments (UK) Limited | Professional & scientific | 2016 |
| AMC Automotive Services Ltd | Wholesale & retail | 2015 |
| AMC Project Management Services Limited | Professional & scientific | 2004 |
| AMD (Haslemere) Limited | Construction | 1985 |
| Amethyst Landscapes Ltd | Professional & scientific | 2024 |
| AML Holdings (Liss) Limited | Real estate | 2023 |
| Amodoma 1 LP | | 2011 |
| Amojyekmu Limited | Wholesale & retail | 2025 |
| Amorvale Construction Limited | | 1977 |
| AMR Communications Ltd | Professional & scientific | 2016 |
| Amtaras Limited | Information & communication | 2025 |
| Ananda Life LLP | | 2020 |
| Anchorpoint Cyber Limited | Information & communication | 2025 |
| Anconsult Limited | Professional & scientific | 2004 |
| Anderson Court Management Company Ltd | Households | 2016 |
| Andrew James Residential (Keats) Ltd | Real estate | 2017 |
| Andrew James Residential Limited | Financial services | 2016 |
| Andrew Salter Consulting Limited | Professional & scientific | 2017 |
| Andy House Garage Ltd | Wholesale & retail | 2026 |
| Angarika Limited | Information & communication | 2013 |
| Anglo Equipment Ltd | Manufacturing | 2007 |
| Animal Answers Ltd | Wholesale & retail | 2022 |
| Animal Aunts Limited | Other services | 2006 |
| Animity Holdings Limited | Real estate | 2011 |
| Anna Anderson Limited | Other services | 2020 |
| Anniq AI Ltd | Information & communication | 2022 |
| Anthro-Scientia Ltd | Administrative & support | 2024 |
| Apex Accounting Surrey Ltd | Professional & scientific | 2020 |
| Apex Business Compliance Ltd | Information & communication | 2022 |
| Apex Dominion Group Ltd | Financial services | 2026 |
| Apiarist GPC Ltd | Agriculture & fishing | 2025 |
| Apollo Analysis Limited | Administrative & support | 1993 |
| APOTHECARY27 Limited | Wholesale & retail | 2017 |
| Approved Builders Limited | Construction | 2010 |
| Aqua Perfection Swimming Pools Ltd | Construction | 2022 |
| ARB Aspire Tree Care Ltd | Agriculture & fishing | 2016 |
| Arbutus Real Estate Ltd | Real estate | 2025 |
| Architectural and Associated Services Ltd | Professional & scientific | 2015 |
| Architecturelive Ltd | Professional & scientific | 2011 |
| Archon Investments Limited | Financial services | 2022 |
| Arcnorth Services Limited | Professional & scientific | 2020 |
| Arcturus Projects Ltd | Information & communication | 2026 |
| Ardrossan Estates Limited | Real estate | 2026 |
| Aries Publishing Limited | Information & communication | 2022 |
| Armstorm Ltd | Manufacturing | 2003 |
| Arnage Business Consulting Ltd | Professional & scientific | 2012 |
| Arrow & SON Limited | Construction | 2013 |
| Arrow Investments (Chelmsford) Limited | Real estate | 2016 |
| Arrow Residential Limited | Real estate | 2016 |
| Artemis Property Services and Development Limited | Construction | 2022 |
| Arthursmith Business Consulting Ltd | Professional & scientific | 2026 |
| Aruna Accountancy Services Limited | Extraterritorial | 2010 |
| Aruna Accountants Limited | Extraterritorial | 2010 |
| Aruna Arts Limited | Arts & recreation | 2009 |
| Aruna Consultancy Limited | Professional & scientific | 1992 |
| Aruna Groups Limited | Extraterritorial | 2011 |
| Aruna Properties (South) Ltd | Real estate | 2022 |
| Aruna Property Management Limited | Extraterritorial | 2018 |
| ASK ARA Group Limited | Financial services | 2023 |
| Aspinal of London Group Limited | Wholesale & retail | 2007 |
| Astrarium Ltd | Professional & scientific | 2024 |
| Atani Operating Partners Ltd | Professional & scientific | 2026 |
| Atlantic Sea Corp LLP | | 2011 |
| Atlantis Bond Limited | Real estate | 2016 |
| Atlantis Prime Limited | Real estate | 2024 |
| Atlas Film Supplies Limited | Manufacturing | 2020 |
| Atticus Industries Ltd | Hospitality | 2018 |
| Attractive Designs Limited | Construction | 2022 |
| Aubergine Legal Limited | Professional & scientific | 2017 |
| Aureum Property Group Ltd | Real estate | 2026 |
| Automated Business Solutions A.I Limited | Information & communication | 2024 |
| Aventine Legends Ltd. | Information & communication | 2018 |
| Aviatours FLY Without Fear Limited | Transport & logistics | 2011 |
| Avplus Ltd | Information & communication | 2009 |
| Axil Arborists Ltd | Administrative & support | 2025 |
| Ayday Limited | Professional & scientific | 2013 |
| Azzurri Developments Ltd | Real estate | 2006 |
| B & M Storage Ltd | Real estate | 2024 |
| B&Lm Investments Ltd | Real estate | 2022 |
| B-Seen Limited | Wholesale & retail | 1999 |
| B.J.G (Sussex) Ltd | Administrative & support | 2024 |
| Bailees Field Ltd | Agriculture & fishing | 2021 |
| Bailen Ltd | Financial services | 2025 |
| Ballard Brown Limited | Information & communication | 2025 |
| Baltic Union Shipbrokers Limited | Transport & logistics | 1940 |
| Bang Creations Limited | Arts & recreation | 2002 |
| Bang Products Ltd | Manufacturing | 2007 |
| Barfold Estate LP | | 2020 |
| Barkers Motor Works Limited | Wholesale & retail | 2009 |
| Based.Cool Limited | Manufacturing | 2019 |
| Battlestar Limited | Financial services | 2022 |
| BC Properties Haslemere Ltd | Construction | 2022 |
| Beckingham Road Management Limited | Households | 1983 |
| Beckmann Architecture Limited | Professional & scientific | 2018 |
| BEE Cooperative Ltd | Manufacturing | 2024 |
| Beech ARC Partners Ltd | Information & communication | 2026 |
| Beech Court Management (Haslemere) Limited | Households | 1986 |
| Beech Tree Property Management Ltd | Real estate | 2022 |