| Aliasdev Studios Ltd | Information & communication | 2014 |
| Alin's Trans Ltd | Transport & logistics | 2025 |
| Alisha Louise Aesthetics Limited | Health & social care | 2021 |
| ALL in Courier Ltd | Transport & logistics | 2025 |
| ALL Star Removals & Storage Limited | Transport & logistics | 2012 |
| ALL Star Self Storage Ltd | Transport & logistics | 2015 |
| Allday Comfort Limited | Real estate | 1999 |
| Allora Salons Ltd. | Other services | 2018 |
| Alltradefinder Ltd | Manufacturing | 2020 |
| ALM Consult Limited | Water & waste | 2013 |
| Alogfireuk Limited | Extraterritorial | 2025 |
| AM Couriers Nationwide Limited | Transport & logistics | 2019 |
| AM Fresh Food & Drink (UK) Limited | Manufacturing | 2017 |
| AM Freshly Squeezed Limited | Manufacturing | 2018 |
| AM Hayes Investments Limited | Real estate | 2019 |
| Amanspeak Trading Limited | Wholesale & retail | 2016 |
| Amatdeus Limited | Construction | 2023 |
| Amber Gruppa Ltd | Construction | 2025 |
| Amelia’S Coffee Corner Ltd | Hospitality | 2025 |
| American Leisure International Limited | Wholesale & retail | 2012 |
| American Tanning Ltd | Extraterritorial | 2014 |
| Amigos Takeaway Ltd | Hospitality | 2021 |
| AMS Transport Services Ltd | Transport & logistics | 2024 |
| Amy&Casy Ltd | Transport & logistics | 2019 |
| AN Inclusive Future C.I.C. | Education | 2011 |
| Ancestral Skin Limited | Manufacturing | 2025 |
| Andrew Fairhurst Electrical Services Ltd | Construction | 2008 |
| Angel GT Racing Ltd | Manufacturing | 2023 |
| Angelcare (NW) Limited | Extraterritorial | 2022 |
| Animation Direct Limited | Information & communication | 2011 |
| Anntech Group Limited | Financial services | 2024 |
| Anteros Community, Community Interest Company | Education | 2014 |
| Anthem Trading Ltd | Wholesale & retail | 2024 |
| Anthony James Property Solutions Limited | Real estate | 2025 |
| Antony Flynn Limited | Financial services | 2019 |
| APC Civils Limited | Construction | 2012 |
| Apollo Vapour Limited | Wholesale & retail | 2018 |
| Applied Business Consultants LLP | | 2009 |
| Aqua Fabrications Limited | Manufacturing | 1988 |
| Aqua Geocomposites Limited | Manufacturing | 1989 |
| Aqua Rail Limited | Extraterritorial | 2012 |
| Aqua Signal & Telegraphic Systems Ltd | Manufacturing | 1994 |
| Aqua Trackside Ltd | Professional & scientific | 1995 |
| Aqua Utilities & Water Limited | Extraterritorial | 2012 |
| Aquila Estate Management Limited | Real estate | 1990 |
| Arch Rival Brows Ltd | Other services | 2020 |
| Architectural Engineering (Aluminium and Steel Glazing) Limited | Wholesale & retail | 2007 |
| Architectural Engineering (Contracts) Limited | Manufacturing | 2008 |
| Architectural Engineering Ltd | Manufacturing | 2014 |
| Arincor Properties Ltd | Real estate | 2026 |
| Aris Drylining Ltd | Construction | 2026 |
| ARJ Technology Consulting Ltd | Information & communication | 2023 |
| Arlo's Kitchen Ltd | Hospitality | 2025 |
| Arrow Northwest | Other services | 1999 |
| Artmgc Ltd | Construction | 2025 |
| Arunsan Ltd | Wholesale & retail | 2023 |
| Asco Engineering Limited | Professional & scientific | 2009 |
| Ashley Travel (Minibuses) Ltd | Transport & logistics | 2003 |
| Ashpark Digital Services Limited | Information & communication | 2017 |
| Aspinall Properties Ltd | Real estate | 2024 |
| Aspire Groundworks Ltd | Administrative & support | 2019 |
| Assist Solutions Software Limited | Information & communication | 2010 |
| Astbury Foods (UK) Ltd | Wholesale & retail | 2018 |
| Atlas Electrical Ltd | Construction | 2023 |
| ATQ Gymwear Ltd | Wholesale & retail | 2025 |
| Austin James Contracting Limited | Construction | 2018 |
| Austin James Group Limited | Professional & scientific | 2024 |
| Autocalibration Ltd | Wholesale & retail | 2022 |
| Avalanche Group Ltd | Hospitality | 2018 |
| AVG by Dows Ltd. | Wholesale & retail | 2026 |
| AW Site Management Limited | Construction | 2016 |
| Axento Capital Ltd | Financial services | 2025 |
| Axiom Repair Centres Limited | Wholesale & retail | 2015 |
| Axiom Repair Holdings Limited | Financial services | 2021 |
| Ayrefield Engineering Limited | Construction | 2021 |
| Ayrefield Trading Ltd | Wholesale & retail | 2026 |
| Ayurveda Limited | Wholesale & retail | 1987 |
| B G R S Ltd. | Administrative & support | 2013 |
| B J Formby & Sons Limited | Transport & logistics | 2021 |
| B.D.M. Northwest Ltd. | Construction | 2003 |
| Baby Nest Ltd | Wholesale & retail | 2025 |
| Bachman Services Limited | Construction | 2026 |
| Baileys DC Services Ltd | Professional & scientific | 2025 |
| Balbunar Ltd | Administrative & support | 2025 |
| Balm Courier Services Ltd | Transport & logistics | 2025 |
| Bamendes Healthcare Ltd | Health & social care | 2021 |
| Barclay (Cammachmore) Limited | Manufacturing | 1990 |
| Barton Manor Hotel & Spa Ltd | Hospitality | 2019 |
| Basictest Ltd | Professional & scientific | 2002 |
| Bathroom Masters Ltd | Construction | 2021 |
| BD Roofing Solutions Ltd | Construction | 2024 |
| BDM Logistics Ltd | Transport & logistics | 2017 |
| BDS Training Ltd | Education | 2006 |
| Beacon Green Ltd | Professional & scientific | 2025 |
| Beacon Light Trail Company Ltd | Hospitality | 2025 |
| Beast NRG Ltd | Manufacturing | 2019 |
| Beauty Diva's Limited | Other services | 2010 |
| Beautybypoppy Ltd | Other services | 2025 |
| BEE and Flower Limited | Professional & scientific | 2003 |
| Befilo Ltd | Construction | 2022 |