| Ample Properties UK Limited | Real estate | 2018 |
| Ampscoe Healthcare Consult Ltd | Health & social care | 2024 |
| Amritpal Transport Ltd | Transport & logistics | 2026 |
| Amritsars Limited | Real estate | 2025 |
| Amsyed UK Limited | Hospitality | 2022 |
| AMU Raja Limited | Wholesale & retail | 2025 |
| Amultani Properties Ltd | Real estate | 2023 |
| Amura Consulting Limited | Information & communication | 2025 |
| Amuzu and Son’S Ltd | Real estate | 2024 |
| AMW Store Ltd | Wholesale & retail | 2021 |
| AN Power Rentals Ltd | Administrative & support | 2025 |
| ANA DE SA Ltd | Manufacturing | 2026 |
| Analytics 3SIXTY Limited | Administrative & support | 2016 |
| Anantaa Aviation Limited | Manufacturing | 2024 |
| Ananya Consulting Services Ltd | Information & communication | 2016 |
| Anav Square Limited | Real estate | 2024 |
| ANC Cars Limited | Wholesale & retail | 2020 |
| Ancenia Beauty Limited | Other services | 2025 |
| Anchorizon Psychology Ltd | Health & social care | 2026 |
| Ancient Attic Limited | Wholesale & retail | 2018 |
| Ancient Lights Limited | Administrative & support | 1996 |
| Andarab Ltd | Real estate | 2024 |
| Andcom Ltd | Wholesale & retail | 2022 |
| Andcor Trans Ltd | Transport & logistics | 2017 |
| Anderson Beauty Balance Ltd | Other services | 2024 |
| Andi Health and Wellbeing Consultancy Ltd | Professional & scientific | 2018 |
| Andy Properties Ltd | Real estate | 2025 |
| Andys Move Ltd | Transport & logistics | 2019 |
| Andys Transport Ltd | Transport & logistics | 2024 |
| Aneli Consulting Limited | Information & communication | 2025 |
| Angaluri Solutions Limited | Information & communication | 2011 |
| Anika Realty Ltd | Real estate | 2025 |
| Anko Studios Ltd | Information & communication | 2025 |
| Anmay Consultancy Services Limited | Information & communication | 2020 |
| Anmol Optometry Ltd | Wholesale & retail | 2025 |
| Anmol Sweets and Food Limited | Hospitality | 2023 |
| ANN Ashley Healthcare Ltd | Administrative & support | 2021 |
| ANN Constructions Ltd | Construction | 2025 |
| Anna Didik Studio Ltd | Professional & scientific | 2026 |
| Annai Food Products Ltd | Hospitality | 2013 |
| Annie and JJ Limited | Health & social care | 2015 |
| Annti Limited | Hospitality | 2025 |
| Anoop's Ltd | Wholesale & retail | 2024 |
| Anpm Consultancy Limited | Professional & scientific | 2018 |
| Anros Design & Construction Ltd | Manufacturing | 2023 |
| Ansh Tech Limited | Information & communication | 2018 |
| Anshika International Limited | Transport & logistics | 2010 |
| Ansong Associates Limited | Professional & scientific | 2010 |
| Ansong Care Services Ltd | Administrative & support | 2024 |
| Ansong Design + Build Limited | Construction | 2020 |
| Ansong Realty Limited | Real estate | 2024 |
| Antony's Hot Sizzle Ltd | Hospitality | 2025 |
| Antov Ltd | Construction | 2011 |
| Anup Savanur Foods Limited | Hospitality | 2021 |
| AP IT Solutions Ltd | Information & communication | 2020 |
| AP Lotus Ltd | Real estate | 2025 |
| APC Hydraulics Limited | Manufacturing | 2013 |
| Apex Autolink Ltd | Wholesale & retail | 2025 |
| Apex Builders Merchant Limited | Wholesale & retail | 2020 |
| Apex Cars and Imports Ltd | Wholesale & retail | 2026 |
| Aphrodite Clinic Ltd | Health & social care | 2025 |
| APM Cloud Ltd | Information & communication | 2025 |
| Apollo Foods and Catering Ltd | Hospitality | 2025 |
| Appdynamics International Ltd | Other services | 2014 |
| Appdynamics UK Ltd | Other services | 2011 |
| Appetiser Pizza Feltham Ltd | Hospitality | 2021 |
| Appliance Doctor (UK) Ltd | Manufacturing | 2007 |
| Aprium Limited | Information & communication | 2014 |
| APS Builders Limited | Construction | 2012 |
| Apulia-Mg-Group Ltd | Wholesale & retail | 2024 |
| AQ Katana Ltd | Construction | 2022 |
| Aqsa&Son Ltd | Wholesale & retail | 2025 |
| Aqua Fresh Produce Limited | Wholesale & retail | 2017 |
| Aquatec Homes Ltd | Construction | 2015 |
| Aquilo Ltd | Transport & logistics | 2026 |
| AR Fitness Ltd | Arts & recreation | 2013 |
| Arabs Community in Hounslow Ltd | Health & social care | 2022 |
| Arabtrans Ltd | Transport & logistics | 2024 |
| Aray Wellbeing Community Interest Company | Education | 2019 |
| ARC Software Solutions Ltd | Information & communication | 2013 |
| Arcadia Software Labs Ltd | Information & communication | 2024 |
| Architecture and Design Practice Ltd | Professional & scientific | 2017 |
| Architecture Design & Construction Ltd | Construction | 2017 |
| Arcredo Ltd | Administrative & support | 2024 |
| ARG Constructions Ltd | Construction | 2016 |
| Aries Property Development Ltd | Real estate | 2025 |
| Arima IT Limited | Information & communication | 2011 |
| Arima Property Limited | Real estate | 2021 |
| Arion Transport Ltd | Transport & logistics | 2022 |
| Arizona.E COM Limited | Wholesale & retail | 2024 |
| ARK Design Studios Limited | Professional & scientific | 2018 |
| Arkwright Roofing Ltd | Construction | 2025 |
| Armand’S Construction Ltd | Construction | 2021 |
| Armour Assets Ltd | Real estate | 2022 |
| Aroha Worlld Ltd. | Wholesale & retail | 2025 |
| Arooshify Ltd | Wholesale & retail | 2026 |
| Arora Enterprises UK PVT Limited | Wholesale & retail | 2014 |
| Arqtic Breeze Ltd | Energy | 2025 |
| Art Consulting Group Limited | Wholesale & retail | 2018 |
| Art Painters & Decorators Ltd | Construction | 2022 |