| Abimedical Limited | Administrative & support | 2023 |
| Abri Woks Limited | Hospitality | 2024 |
| Absolute CAD Designs Limited | Professional & scientific | 2009 |
| Absolute Deliveries Limited | Administrative & support | 2009 |
| Absolute Framing Solutions Ltd | Professional & scientific | 2023 |
| Abundance Luxe Hair Ltd | Other services | 2024 |
| Abu’S OUD Ltd | Wholesale & retail | 2025 |
| ABX Grid Diagnostics Ltd | Information & communication | 2020 |
| AC Private Finance Ltd | Financial services | 2019 |
| Accbyte Ltd | Professional & scientific | 2024 |
| Access Transport Planning Limited | Professional & scientific | 2025 |
| Accurat Pest Management Limited | Agriculture & fishing | 2016 |
| Accurate Machining Services Ltd | Manufacturing | 2020 |
| Ace Motor Group Ltd | Wholesale & retail | 2020 |
| Acelia Ltd | Real estate | 2025 |
| Acquire Investments Limited | Real estate | 2017 |
| Acquired Services Ltd | Health & social care | 2022 |
| Acquisition Consulting Services Ltd | Professional & scientific | 2024 |
| ACR Couriers Ltd | Transport & logistics | 2025 |
| Acrylik Kitchens Ltd | Construction | 2017 |
| Actavo Hire and Sales UK Limited | Professional & scientific | 2017 |
| Action Care Limited | Public administration | 2021 |
| Activity Crest Limited | Administrative & support | 2024 |
| Adaeso Herbal Centre Limited | Wholesale & retail | 2025 |
| Adam Global Recruitment Limited | Other services | 2025 |
| Adapt Holdings Ltd | Professional & scientific | 2020 |
| Adaption Management Services Limited | Professional & scientific | 2019 |
| Adco Constructions Group Ltd | Construction | 2024 |
| Adecareuk Ltd | Health & social care | 2021 |
| Adelar Facilities Management Ltd | Administrative & support | 2023 |
| Adelar Investments Ltd | Financial services | 2025 |
| Adelar Properties Ltd | Real estate | 2023 |
| Adenike Morakinyo Ltd | Health & social care | 2023 |
| Admire Flowers Ltd | Wholesale & retail | 2020 |
| Admire Homes Ltd | Real estate | 2018 |
| Adore Letting Ltd | Real estate | 2021 |
| Adrian Iancu Ltd | Transport & logistics | 2025 |
| Adriano Maio Consulting Ltd | Professional & scientific | 2024 |
| ADS & Sons Composite Doors Ltd | Wholesale & retail | 2017 |
| ADS & Sons Hardware Ltd | Construction | 2023 |
| ADS Commercials Ltd | Transport & logistics | 2026 |
| Adyaa Ltd | Transport & logistics | 2025 |
| AEA Electrical Installations Ltd | Construction | 2015 |
| AEC Healthcare Group Ltd | Health & social care | 2025 |
| Aerovion Ltd | Professional & scientific | 2026 |
| AES CRC Ltd | Wholesale & retail | 2026 |
| Aestheticscorner Limited | Health & social care | 2022 |
| Aetherlane Ltd | Information & communication | 2023 |
| AFA Mart Limited | Wholesale & retail | 2025 |
| AFC Bridgnorth Ltd | Arts & recreation | 2013 |
| AFC Bridgnorth Social Club Ltd | Hospitality | 2025 |
| Afcb Events Ltd | Hospitality | 2026 |
| African and Minority Families Support Services (Afrifass) CIC | Public administration | 2023 |
| Afzal Property Holdings Ltd | Real estate | 2026 |
| AG Eco Solutions Ltd | Professional & scientific | 2023 |
| AG Property Service Ltd | Construction | 2024 |
| Agam Culture Group Ltd | Arts & recreation | 2019 |
| Agam Transport Ltd | Transport & logistics | 2018 |
| Agci Ltd | Information & communication | 2012 |
| Agewell Community Interest Company | Health & social care | 2013 |
| Ahadu Business Group Limited | Real estate | 2024 |
| AHI Contractors Ltd | Construction | 2023 |
| AHI Home Ltd | Households | 2025 |
| Ahlulbayt Centre for Shia Studies | Health & social care | 2011 |
| Ahsu Foods Ltd | Hospitality | 2025 |
| AHZ Consulting Ltd | Other services | 2025 |
| AI Treasure Spot Ltd | Wholesale & retail | 2025 |
| AIC Project Management Ltd | Construction | 2024 |
| Aidtraining Ltd | Education | 2022 |
| Aiit UK Limited | Information & communication | 2007 |
| Aitan Building Services Ltd | Construction | 2023 |
| Aiza Services Ltd | Administrative & support | 2025 |
| AJ Dhillon Investments Ltd | Real estate | 2021 |
| Aj&M Car Parts Limited | Wholesale & retail | 2025 |
| AJH Stores Ltd | Wholesale & retail | 2024 |
| Ajit Builders Ltd | Construction | 2022 |
| AJX Virk Ltd | Transport & logistics | 2024 |
| AK Building Supplies Ltd | Wholesale & retail | 2026 |
| AK Saman Body Work Ltd | Wholesale & retail | 2024 |
| Akaal JI Sahai Ltd | Transport & logistics | 2021 |
| AKB Engineering Limited | Administrative & support | 2014 |
| AKB Logistics Limited | Transport & logistics | 2025 |
| Akde Ltd | Wholesale & retail | 2022 |
| Akesi Foods UK Ltd | Hospitality | 2019 |
| Akro Solutions Ltd | Information & communication | 2023 |
| AKS General Construction Ltd | Construction | 2022 |
| AL Jabal Limited | Wholesale & retail | 2025 |
| Al-Amana Holdings Ltd | Real estate | 2025 |
| Al-Khail Organaisation Ltd | Other services | 2025 |
| Alafia & Isimi Ltd | Information & communication | 2025 |
| Alamakota Limited | Administrative & support | 2025 |
| Alamoire Efun Global Enterprise UK Ltd | Professional & scientific | 2020 |
| Alb-Rama Ltd | Construction | 2025 |
| Albright Investments Limited | Extraterritorial | 2019 |
| Alcec Construction Ltd | Construction | 2024 |
| Alder Crecent Ltd | Wholesale & retail | 2021 |
| Alegna Care Limited | Health & social care | 2025 |
| Alexetrans Ltd | Transport & logistics | 2018 |
| Algor Group Holdings Limited | Administrative & support | 2022 |
| Alicia Practitioner Ltd | Health & social care | 2024 |