| AIM to Sustain Limited | Other services | 2023 |
| Air Permeability Testing UK Ltd | Professional & scientific | 2017 |
| AJ & EJ Ltd | Hospitality | 2024 |
| AJB Caterers Limited | Hospitality | 2015 |
| AJD Surveying Ltd | Construction | 2021 |
| AJK Electrical Limited | Construction | 2014 |
| AJK Property Developments Limited | Real estate | 2024 |
| Ajpr Properties Ltd | Real estate | 2025 |
| AK Racing Developments Ltd | Wholesale & retail | 2021 |
| AKA Bradley Electrical Ltd | Construction | 2022 |
| Akagi Technology Limited | Wholesale & retail | 2013 |
| Aken Lift Limited | Professional & scientific | 2025 |
| Akron Gate Management Limited | Households | 2011 |
| Akroyd and Smithers Ltd | Financial services | 2020 |
| Al-Nasiri Ltd | Health & social care | 2025 |
| AL88 Limited | Real estate | 2025 |
| Alamo Invest Limited | Financial services | 2019 |
| Alan Ball Flooring Limited | Construction | 2009 |
| Alan Lewis Ltd | Professional & scientific | 2012 |
| Alan Powell Electrical Contractors Limited | Construction | 2002 |
| Alantamer Limited | Real estate | 2024 |
| Alaska Plot 25 Limited | Extraterritorial | 2021 |
| Alaska Plot 26 Limited | Extraterritorial | 2021 |
| Alaska Plot 27 Limited | Extraterritorial | 2021 |
| Alaturka BBQ Restaurant Shrewsbury Ltd | Hospitality | 2022 |
| ALAZ24 Ltd | Hospitality | 2026 |
| Alben Holdings Ltd | Financial services | 2025 |
| Alberbury Castle Company Ltd | Professional & scientific | 2013 |
| Albert Close (Ottery) Management Limited | Real estate | 2019 |
| Albion Employment Services Limited | Administrative & support | 2019 |
| Albright Hussey Hotel Limited | Hospitality | 2011 |
| Albrightlee Hall Barns Management Company Limited | Households | 2015 |
| Albrighton Estate LLP | | 2013 |
| Albrighton Poultry Company Limited | Agriculture & fishing | 1997 |
| Albury Place (Shrewsbury) Management Company Limited | Real estate | 2019 |
| Alchemy HR Consulting Ltd | Administrative & support | 2012 |
| Aldbury Court Management Company Limited | Households | 1996 |
| Alderoak Herefords Limited | Agriculture & fishing | 2019 |
| Ale&Oli Ltd | Hospitality | 2019 |
| Aleso Ltd | Wholesale & retail | 2019 |
| Alex Hunter Eyecare Ltd | Wholesale & retail | 2019 |
| Alexander and Rose Limited | Professional & scientific | 2017 |
| Alexander House Management Co. Limited | Households | 2000 |
| Alexander Martin Ltd | Professional & scientific | 2015 |
| Alexis Star Business Ltd | Transport & logistics | 2021 |
| Alexon Appliances Limited | Wholesale & retail | 2012 |
| ALF Agencies Limited | Administrative & support | 2017 |
| Algonia Capital Ltd | Financial services | 2025 |
| ALI Mclachlan & Co Ltd | Professional & scientific | 2022 |
| Alice Court (Bilston) Management Limited | Households | 2006 |
| Alice YU Media Limited | Professional & scientific | 2024 |
| Alisha-Jayne Dance Academy Ltd | Arts & recreation | 2024 |
| ALL Clear Window Repairs Limited | Construction | 2016 |
| ALL Delivery Limited | Transport & logistics | 2024 |
| ALL in Black Accounting Solutions Limited | Professional & scientific | 2019 |
| ALL Pump & Valve Limited | Manufacturing | 2013 |
| ALL Pump Solutions LLP | | 2010 |
| ALL Season Conservatory Roofs Limited | Construction | 2022 |
| ALL the Elements Limited | Construction | 2012 |
| ALL Things Cloud Limited | Information & communication | 2023 |
| All-In Cleaning Solutions Ltd | Administrative & support | 2021 |
| Allan Rowlands (Timber) Limited | Transport & logistics | 2012 |
| Allcare Shropshire Limited | Health & social care | 2003 |
| Alley Barbers Limited | Other services | 2003 |
| Allform Utilities Ltd | Water & waste | 2021 |
| Allin Project Services Limited | Professional & scientific | 2025 |
| Allinagencyuk Limited | Professional & scientific | 2021 |
| Allington Consult Limited | Professional & scientific | 2021 |
| Allium Associates Ltd | Professional & scientific | 2024 |
| Allscott Meads Management Company Limited | Households | 2020 |
| ALM Consulting Ltd | Information & communication | 2017 |
| Alma Veterinary Care Limited | Extraterritorial | 2009 |
| Alpacalypse Ltd | Wholesale & retail | 2019 |
| Alpha Event Traffic Solutions Ltd | Other services | 2017 |
| Alpha Global Security Services Limited | Administrative & support | 2022 |
| Alpha Security Logistics Limited | Financial services | 2015 |
| Alphabet-Zed Ltd | Manufacturing | 2011 |
| Alphabetclub.Com Limited | Professional & scientific | 2010 |
| Alphin Brook Management Company Limited | Households | 2002 |
| Alpic Energy Limited | Other services | 2020 |
| Alpine Design Consultants Limited | Information & communication | 2012 |
| Alpine House Trading Ltd | Real estate | 2012 |
| ALS Asset Management Ltd | Financial services | 2020 |
| ALS Projects Limited | Professional & scientific | 2024 |
| Alsafwa Ltd | Professional & scientific | 2024 |
| Altaclimate Limited | Construction | 2020 |
| Alternatives 4 Learning Ltd | Education | 2016 |
| Always Apprentices Ltd | Extraterritorial | 2018 |
| Always Consult Ltd | Professional & scientific | 2009 |
| AM Cruise Limited | Professional & scientific | 2022 |
| AM Infosec Limited | Information & communication | 2021 |
| AMA Estate & Development Ltd | Construction | 2025 |
| AMA Logistics Ltd | Transport & logistics | 2025 |
| AMA Sports Photo Agency Limited | Professional & scientific | 2024 |
| Amaleon Ltd | Information & communication | 2025 |
| Amaraya Limited | Manufacturing | 2024 |
| Amarita Ltd | Health & social care | 2021 |
| Amarnath Associates Ltd | Health & social care | 2015 |
| Amber and Ayesha Ltd | Wholesale & retail | 2023 |
| Amber Packaging Limited | Professional & scientific | 2010 |