| & Travel Ltd | Administrative & support | 2024 |
| 180 Kentish Town Developments Limited | Administrative & support | 2015 |
| 1878 Enterprises Limited | Administrative & support | 2015 |
| 1ST Choice Education Ltd | Education | 2020 |
| 1ST Class Results Ltd | Administrative & support | 2015 |
| 1ST Health Products Ltd | Wholesale & retail | 2012 |
| 2 & 4 Investments Limited | Financial services | 2021 |
| 24/7 Sparkle Clean Ltd | Construction | 2018 |
| 272 Wellness Ltd | Health & social care | 2015 |
| 360 Wind Ltd | Construction | 2019 |
| 360 Wind Services Ltd | Construction | 2025 |
| 360 Wind Solutions Ltd | Construction | 2024 |
| 365 Wind Ltd | Construction | 2026 |
| 38.6 Solutions Ltd | Administrative & support | 2016 |
| 3I Technology Company Ltd | Professional & scientific | 2021 |
| 4D & SJ Consulting Ltd | Administrative & support | 2024 |
| 6 Grosvenor Road Limited | Real estate | 2013 |
| A & H Z Ltd | Real estate | 2014 |
| A & J Automotive Limited | Wholesale & retail | 2018 |
| A B Properties (North Wales) Ltd | Real estate | 2022 |
| A E Lloyd Asset Management Ltd. | Extraterritorial | 2015 |
| A J J EXO Skeletons Ltd | Manufacturing | 2025 |
| A J Restaurant Co. Limited | Hospitality | 2014 |
| A&Sp Property Limited | Hospitality | 2017 |
| A. Jones & SON (GAS Services) Limited | Construction | 2006 |
| A.Elraggal Ltd | Other services | 2025 |
| A.J.Peace Consultants Ltd | Professional & scientific | 2019 |
| A.N.V. Inspection Ltd | Professional & scientific | 2024 |
| A.R Lifting Solutions Ltd | Construction | 2018 |
| A.R.B. Works UK Limited | Administrative & support | 2016 |
| A55 Services Limited | Transport & logistics | 2018 |
| AB Firestopping Ltd | Construction | 2021 |
| Abbeyford Caravan and Trailer Company Limited | Hospitality | 1965 |
| Abbeylands Lettings Limited | Real estate | 2017 |
| Aberconwy Locksmiths Limited | Other services | 2009 |
| Abergele Handyman Services Ltd | Manufacturing | 2018 |
| Abernet Ltd | Information & communication | 2010 |
| Absolut Formwork & Shuttering Contractors Limited | Construction | 2003 |
| Absolute Duty Fire Risk Assessment Ltd | Other services | 2020 |
| Abtech Safety Limited | Wholesale & retail | 1991 |
| Abzac Architecture Ltd | Professional & scientific | 2014 |
| Accounts Associates Limited | Professional & scientific | 2004 |
| AD Property Developments Limited | Construction | 2005 |
| Aden NW Ltd | Hospitality | 2023 |
| Adler Consultancy Limited | Real estate | 2018 |
| Adrenaline Management Ltd | Administrative & support | 2016 |
| Adrenaline Tattoo Studio Ltd | Other services | 2012 |
| Advance Technology Solutions Ltd | Manufacturing | 2017 |
| Advantage Garage Doors Ltd | Other services | 2002 |
| Advocate Financial Planning Ltd | Financial services | 2014 |
| AF Life Ltd | Manufacturing | 2025 |
| AG Security Care Ltd | Other services | 2018 |
| AGM Fibre Communications Ltd. | Information & communication | 2023 |
| Aiden Associates Limited | Extraterritorial | 2003 |
| AIGNéIS HOLDINGS LTD. | Professional & scientific | 2024 |
| Ainsley Clinic Limited | Health & social care | 2014 |
| AIS Aviation Ltd | Other services | 2013 |
| Akprop Ltd | Construction | 2021 |
| Alaw Owen CYF | Arts & recreation | 2022 |
| Alex Davies Construction Ltd | Construction | 1994 |
| Alexander Martin Project Management Limited | Information & communication | 2015 |
| Alexandra House Support Services Ltd | Health & social care | 2018 |
| Aliwaves Limited | Other services | 2002 |
| Allt WEN Development Limited | Construction | 2018 |
| Allt WEN Residents Association Limited | Households | 2022 |
| Almighty Flat Roofing Ltd | Construction | 2020 |
| Almond Tree Cafe Ltd | Other services | 2012 |
| Alpha Minds - Every Mind Matters (NW) Community Interest Company | Other services | 2026 |
| Alternative Care Systems Ltd | Information & communication | 2025 |
| Amanos NW Limited | Households | 2016 |
| Andrea Parry & Associates Limited | Health & social care | 2021 |
| Andrew David Contracting Limited | Construction | 2016 |
| Andy Johnson Surveys Ltd | Other services | 2018 |
| Anglia Building & Decorating Contractors Limited | Construction | 2016 |
| ANN Burgess Consultancy Ltd | Professional & scientific | 2015 |
| Anna Rose Healthcare Limited | Health & social care | 2015 |
| Ansun Chiropractic Ltd | Administrative & support | 2017 |
| Antrobus Estates Ltd | Real estate | 2026 |
| Antworx Ltd | Construction | 2022 |
| AP Plumbing and Heating Services Ltd | Other services | 2018 |
| Apex Lining Solutions Ltd | Construction | 2022 |
| Apple Transcription Limited | Professional & scientific | 2006 |
| Aqua Holiday Lets Ltd | Real estate | 2022 |
| ARB Line Ltd | Other services | 2018 |
| Arbworks Firewood Limited | Wholesale & retail | 2022 |
| Arch Contractors Ltd | Construction | 2023 |
| Arch Engineering Design Limited | Other services | 2015 |
| Archies Prestatyn Ltd | Hospitality | 2020 |
| Arctic Air Conditioning (NW) Ltd | Other services | 2019 |
| Arctic Circle Developments Ltd | Construction | 2020 |
| Ardent Aviation Limited | Manufacturing | 2023 |
| Arian Wealth Management Ltd. | Transport & logistics | 2024 |
| Aricomm Networks Ltd | Information & communication | 2023 |
| Arknell Estates Ltd | Real estate | 2022 |
| Arrakis Consulting Ltd | Professional & scientific | 2019 |
| Arvad Ltd | Other services | 2019 |
| Ascent Financial Planning Holdings Limited | Financial services | 2022 |
| Ascent Financial Planning Limited | Financial services | 2018 |
| ASG Property Development Limited | Construction | 2014 |
| ASH Dykes Limited | Information & communication | 2018 |