| Andys Gardening Services Ltd | Other services | 2004 |
| Anglogica Ltd | Information & communication | 2016 |
| Angus Project Finance Services Limited | Financial services | 2012 |
| Animals on the Edge Limited | Information & communication | 2020 |
| Anna Gray Consulting Ltd | Professional & scientific | 2019 |
| Annare Property Ltd | Real estate | 2025 |
| Another a Ltd | Extraterritorial | 2023 |
| ANR Convenience Stores Ltd | Wholesale & retail | 2026 |
| Ansell Good Developments Limited | Construction | 2017 |
| Anthony Braden Limited | Wholesale & retail | 2004 |
| Anthony Braden Online Ltd. | Wholesale & retail | 2000 |
| Anti Holdings Limited | Construction | 2022 |
| Anywhere VA Ltd | Administrative & support | 2026 |
| AOD Projects Ltd | Construction | 2024 |
| Aperture 1 Ltd | Information & communication | 2011 |
| Apex Finch Limited | Information & communication | 2024 |
| Apical Enterprises Ltd | Extraterritorial | 2016 |
| APL Holdings Limited | Professional & scientific | 1990 |
| Apomatrix Ltd | Real estate | 2024 |
| Apple a Day Ltd | Administrative & support | 2013 |
| Appleton Futures Limited | Administrative & support | 2014 |
| Appleton MAY & Sons Ltd | Manufacturing | 2013 |
| Appleton Waste Clearance Ltd | Water & waste | 2022 |
| Appletree Studio Ltd | Wholesale & retail | 2016 |
| Applied Photophysics Limited | Manufacturing | 1971 |
| Aquila Tower Ltd | Real estate | 2024 |
| AR Property Sales and Investments Ltd | Real estate | 2024 |
| Aramis Construction Works Ltd | Construction | 2017 |
| Arborworks Ltd | Agriculture & fishing | 2025 |
| Arcadia Digital Ltd | Information & communication | 2025 |
| Ardenia Holdings Limited | Administrative & support | 2016 |
| Ariana Menassa Ltd | Arts & recreation | 2025 |
| Aries Corporate Investments Ltd. | Real estate | 2008 |
| ARK Construction Management Services Limited | Construction | 2019 |
| Armz Limited | Construction | 2017 |
| Arsenal Cards Ltd | Wholesale & retail | 2025 |
| Art of the Market Ltd | Administrative & support | 2011 |
| Art Vanderlay Enterprises Ltd | Education | 2020 |
| Arta Consultants Limited | Construction | 2015 |
| Artaois Ltd | Professional & scientific | 2009 |
| Artful Delights Ltd | Wholesale & retail | 2024 |
| Artificial Intelligence Assist Limited | Information & communication | 2025 |
| Artisan Bathrooms and Kitchens Ltd | Construction | 2018 |
| Artpeggios Limited | Education | 2011 |
| Arulama Fast Food Limited | Wholesale & retail | 2013 |
| Arvind Parmar Limited | Professional & scientific | 2013 |
| AS1ROOFINGSOLUTIONS Ltd | Construction | 2025 |
| Ascend Lease Limited | Information & communication | 2025 |
| Ascendant Homes Ltd | Real estate | 2010 |
| Ascendant One Ltd | Construction | 2017 |
| Ascent Partners Consulting Ltd | Other services | 2025 |
| Ashcombe Group Management Services Ltd | Financial services | 2023 |
| Ashcourt Freehold Limited | Households | 1973 |
| Ashley Park Living LLP | | 2022 |
| Ashton Allsop Limited | Professional & scientific | 2014 |
| Ashwinds Ltd | Extraterritorial | 2023 |
| Ashwood Estate (Woking) Limited | Households | 1999 |
| Ashwood House (Woking) Limited | Households | 1999 |
| Aslotel Limited | Wholesale & retail | 1986 |
| Aspectdate Property Management Limited | Households | 1998 |
| Aspen Associates Limited | Financial services | 2012 |
| Aspine Farm Management Limited | Real estate | 2023 |
| Aspire Broad Lane Limited | Construction | 2022 |
| Aspire Cedar House Limited | Construction | 2024 |
| Aspire Chestnuts Limited | Construction | 2018 |
| Aspire Executive Homes Limited | Construction | 2023 |
| Aspire Flagship 3 Limited | Construction | 2023 |
| Aspire Four Acres Limited | Construction | 2022 |
| Aspire Heath Lodge Limited | Construction | 2022 |
| Aspire Holtwood Ltd | Construction | 2018 |
| Aspire Investments and Property Developments LLP | | 2010 |
| Aspire JAY Mews Limited | Construction | 2024 |
| Aspire Luxury Properties Limited | Construction | 2016 |
| Aspire Luxury Property Developments Limited | Construction | 2019 |
| Aspire Luxury Property Group Limited | Administrative & support | 2022 |
| Aspire Luxury Property Investments Ltd | Real estate | 2026 |
| Aspire Manor Farm Limited | Construction | 2019 |
| Aspire Matham Limited | Construction | 2023 |
| Aspire Meadow Farm Limited | Construction | 2021 |
| Aspire Mizen Limited | Construction | 2024 |
| Aspire Property Developments LLP | | 2010 |
| Aspire Specialised Homes LLP | | 2010 |
| Aspire ST Omer 2 Limited | Construction | 2022 |
| Aspire ST Omer Limited | Construction | 2021 |
| Aspire Stokesheath Limited | Construction | 2022 |
| Aspire Ward Street Limited | Construction | 2025 |
| Aspire White House Ltd | Construction | 2020 |
| Aston Media Group UK Ltd | Professional & scientific | 2023 |
| Astruo Ltd | Information & communication | 2024 |
| ASV Consultants Limited | Financial services | 2025 |
| AT Chesson Ltd | Financial services | 2026 |
| AT Ohlsson Ltd | Professional & scientific | 2026 |
| Atelier Interiors Limited | Wholesale & retail | 2007 |
| Athi's Cafe Ltd | Hospitality | 2021 |
| Atiq Care Solutions Limited | Health & social care | 2014 |
| Atlantean Projects Ltd | Information & communication | 2009 |
| Atlantean Properties Ltd | Real estate | 2024 |
| Atsource Foods Limited | Wholesale & retail | 2003 |
| Atwood Residents' Association Limited | Households | 2021 |
| Aucirrus Limited | Professional & scientific | 2009 |