| Afribrothers Ltd | Wholesale & retail | 2024 |
| AGE Concern Dover Limited | Health & social care | 2011 |
| Agilerl Inc. | | 2025 |
| AGS Consults Ltd | Information & communication | 2014 |
| AH Construction Management Ltd | Professional & scientific | 2026 |
| Ahdk Retail Limited | Wholesale & retail | 2019 |
| Ahil Retail Limited | Wholesale & retail | 2023 |
| AI Estates Management Ltd | Real estate | 2024 |
| AI Training London Solution Ltd | Extraterritorial | 2024 |
| Aiobis Labs Ltd | Information & communication | 2024 |
| Air Estates Limited | Real estate | 2020 |
| Air-One Consulting Invest Ltd | Professional & scientific | 2025 |
| Air-One Consulting Ltd | Extraterritorial | 2025 |
| AJD Vehicle Services Ltd | Wholesale & retail | 2021 |
| AJJ Consultancy Limited | Professional & scientific | 2025 |
| AK Super Pizza Ltd | Hospitality | 2026 |
| Akad Property UK Ltd | Real estate | 2016 |
| AKY Construction Ltd | Construction | 2026 |
| AL Patate Boraine Ltd | Extraterritorial | 2025 |
| Alan Ball Roofing Limited | Construction | 2018 |
| Alberti & Santi UK Limited | Transport & logistics | 1993 |
| Albie & Frankie Holdings Limited | Financial services | 2023 |
| Albion House (Deal) Limited | Households | 2005 |
| Alcopia LLC | | 2021 |
| Aldersham Investments Limited | Financial services | 2026 |
| Aldybry Concept Invest Ltd | Extraterritorial | 2023 |
| Aldybry Concept Ltd | Extraterritorial | 2023 |
| ALI Dover Ltd | Hospitality | 2024 |
| Alice Bell Limited | Real estate | 2024 |
| Alifit Limited | Construction | 2020 |
| ALL Bright NOW Ltd | Administrative & support | 2025 |
| ALL Business & Research Partnership Limited | Other services | 2013 |
| ALL Consulting Horsinvest Ltd | Professional & scientific | 2012 |
| ALL in One Homes Ltd | Real estate | 2017 |
| ALL in One Property Enterprises Ltd | Construction | 2014 |
| ALL One Solution Security Ltd | Administrative & support | 2019 |
| ALL Sorts of Music Limited | Administrative & support | 2010 |
| ALL Things Drainage Limited | Water & waste | 2017 |
| ALL Things Metal Limited | Manufacturing | 2015 |
| Allantia Consulting Limited | Professional & scientific | 2025 |
| Allied Construction and Homes Limited | Real estate | 1984 |
| Allison Emms Consultancy Ltd | Professional & scientific | 2025 |
| Alphaware (Investments) Limited | Real estate | 2003 |
| AMA Beauty Ltd | Other services | 2025 |
| Amal Aesthetics Ltd | Health & social care | 2018 |
| Amali Housing Ltd | Real estate | 2024 |
| Amarillo Sandwich Bar Limited | Hospitality | 2024 |
| Amaze Maritime Services Ltd | Transport & logistics | 2025 |
| AMF Consulting, LLC | | 2016 |
| Amnis Consulting Limited | Construction | 2025 |
| Amorsolo Ltd | Health & social care | 2022 |
| AMS Engineering S.E. Ltd | Manufacturing | 2014 |
| Amsterdam House Ltd | Hospitality | 2000 |
| Amtj Private Ltd | Wholesale & retail | 2025 |
| AMY Linford & Associates Ltd | Professional & scientific | 2026 |
| Analytic INT IT PLC | Extraterritorial | 2023 |
| Andacasa Limited | Real estate | 2021 |
| Andkou Languages Ltd | Professional & scientific | 2025 |
| Andrew Rose Property Ltd | Real estate | 2017 |
| Andrikou Properties Ltd | Real estate | 2024 |
| Andy Scaplehorn Consulting Limited | Professional & scientific | 2023 |
| Angel & Allsop Financial Services Ltd | Financial services | 2018 |
| Anikeoniworobo Global Ltd | Hospitality | 2025 |
| Anthony & Carole Limited | Real estate | 2019 |
| Anton Antoni Barber BUS Limited | Other services | 2018 |
| Anton Dover Ltd | Extraterritorial | 2023 |
| Anuoluwa Afro-Caribbean Foods and General Store Ltd | Manufacturing | 2025 |
| Apex Advisory Ltd | Information & communication | 2023 |
| Apostol Kolev Limited | Transport & logistics | 2017 |
| Aqua Hospitality Limited | Hospitality | 2023 |
| Aquamarine Homes Limited | Real estate | 2022 |
| ARC Test Ltd | Professional & scientific | 2021 |
| Arceau Solutions Ltd | Information & communication | 2015 |
| Archer Property Enterprises Ltd | Professional & scientific | 2025 |
| Archers Place II Management Limited | Households | 2007 |
| Archers Place Property Management Limited | Households | 2004 |
| Architectural & Historical Renovations Ltd | Construction | 2025 |
| Architecture and Landscape Practice Limited | Administrative & support | 2025 |
| Ardendale Investments Limited | Financial services | 2026 |
| Areani Resources Limited | Mining & quarrying | 2021 |
| Arena & Partners Advisors LLC | | 2014 |
| Argima Ltd | Extraterritorial | 2007 |
| ARK Civils Ltd | Construction | 2023 |
| Arran's Barbers Shop Ltd | Other services | 2018 |
| Arrested Developments Deal Ltd | Construction | 2022 |
| Arron Crascall Limited | Information & communication | 2015 |
| Arrow & Atlas Group Invest Ltd | Extraterritorial | 2023 |
| Arrow & Atlas Group Ltd | Extraterritorial | 2023 |
| Art ET Finitions Ltd | Extraterritorial | 2009 |
| Art in Heaven Limited | Professional & scientific | 2008 |
| Arumpoo International Ltd | Administrative & support | 2016 |
| Ascension Works Limited | Information & communication | 2022 |
| Asea Services Limited | Construction | 2024 |
| ASH Assured Accounting Ltd | Professional & scientific | 2026 |
| ASH Hair GEL Limited | Wholesale & retail | 2025 |
| Ashen Tree Developments Ltd | Construction | 2018 |
| ASJ Investment Limited | Households | 2017 |
| Aslan Foods Ltd | Hospitality | 2019 |
| ASM Admin Limited | Administrative & support | 2009 |
| Assemat Ltd | Extraterritorial | 2020 |