| 1ST Access Rentals Limited | Extraterritorial | 2017 |
| 256 Logistics Ltd | Transport & logistics | 2022 |
| 2CS Transport Limited | Transport & logistics | 2018 |
| 3XSTRANDS CIC | Health & social care | 2023 |
| A J Access Holdings Limited | Professional & scientific | 2011 |
| A J Access Platforms Limited | Manufacturing | 2011 |
| A J Rentals Limited | Extraterritorial | 1990 |
| A Plant Developments Ltd | Financial services | 2024 |
| A Plant Homes Ltd | Construction | 2024 |
| A S Patel Ltd | Wholesale & retail | 2020 |
| A.E.T. Engineering Limited | Manufacturing | 1974 |
| AB MIX Concrete & Aggregates (Barnsley) Ltd | Manufacturing | 2025 |
| Abbey Industrial (Holdings) Limited | Financial services | 2017 |
| Abbey Industrial Automation Ltd | Financial services | 2021 |
| Abbey Industrial Solutions Ltd | Wholesale & retail | 1989 |
| Abilitybridge Support Services Ltd | Education | 2026 |
| Abson Blaza Limited | Real estate | 2010 |
| ABW Yorkshire Limited | Information & communication | 2017 |
| AC Damp Proofing Specialists Ltd | Construction | 2023 |
| Ac-Sys Limited | Professional & scientific | 2009 |
| Academic Advancement Ltd | Extraterritorial | 2022 |
| Access Hire Nationwide Limited | Administrative & support | 2007 |
| Access Surveying Ltd | Professional & scientific | 2021 |
| Ace Testing and Repairs Ltd | Manufacturing | 2023 |
| Adaab.Gifts Ltd | Wholesale & retail | 2023 |
| Adam Jaff Ltd | Other services | 2024 |
| Addingham Developments Limited | Real estate | 2005 |
| Advanced Climate Control Services Ltd | Construction | 2017 |
| Advertiser Office Printers Limited | Manufacturing | 2021 |
| Adynik Ltd | Professional & scientific | 2016 |
| Aerials for Industry Limited | Professional & scientific | 2002 |
| Affdee Investments Ltd | Health & social care | 2022 |
| AFI Aerial Platforms Limited | Extraterritorial | 2006 |
| AFI Bidco Limited | Professional & scientific | 2013 |
| AFI Group Limited | Extraterritorial | 1974 |
| AFI Holdings Limited | Professional & scientific | 2006 |
| AFI Midco Limited | Professional & scientific | 2013 |
| AFI Rentals Group Limited | Professional & scientific | 2019 |
| AFI Topco Limited | Professional & scientific | 2013 |
| Afi-Uplift Limited | Administrative & support | 1998 |
| Agri Weld Services Limited | Manufacturing | 2023 |
| Ahcs Grab Hire Ltd | Other services | 2026 |
| AI Industrial Supplies Ltd | Wholesale & retail | 2009 |
| Aimen’S Barbers Limited | Other services | 2025 |
| Aimm Data Analytics Ltd | Information & communication | 2022 |
| AJM Facilities Management Ltd | Real estate | 2025 |
| Albany Track Works Limited | Manufacturing | 2016 |
| Albi Plumbing & Heating Ltd | Extraterritorial | 2018 |
| Albion Machinery Limited | Manufacturing | 1998 |
| ALC Enterprises Limited | Professional & scientific | 2023 |
| Alens Nice Barber Ltd | Other services | 2023 |
| ALL Saints Normanton Community Project Ltd | Health & social care | 2010 |
| ALM Delivery Ltd | Transport & logistics | 2020 |
| Alpha Integrated Systems Limited | Administrative & support | 2007 |
| Alpino Gelato Ltd | Wholesale & retail | 2018 |
| Alternatives Activity Centre | Education | 2000 |
| Altitude Access Limited | Professional & scientific | 2003 |
| Altofts Greenscapes Limited | Administrative & support | 2020 |
| Altofts PO Limited | Wholesale & retail | 2013 |
| ALY Logistics Ltd | Transport & logistics | 2016 |
| Ambler Civil Engineering Ltd | Construction | 2018 |
| AMZ Hustles Ltd | Extraterritorial | 2022 |
| Anasen Properties Limited | Real estate | 2023 |
| Andrew's Treasures Ltd | Wholesale & retail | 2024 |
| Andrzej Poltorak Ltd | Transport & logistics | 2014 |
| Andy & MAX Ltd | Administrative & support | 2024 |
| Apelson Appliances UK Ltd | Wholesale & retail | 2012 |
| Apex (Leeds) Holdings Limited | Financial services | 2019 |
| Apex Forecourt Maintenance Limited | Construction | 2024 |
| Apex Influence Ltd | Professional & scientific | 2025 |
| Apex Property (Leeds) Limited | Real estate | 2018 |
| Apparel Insider Ltd | Information & communication | 2017 |
| Appleyard Smart Consulting Limited | Information & communication | 2022 |
| Arooje Balti Ltd | Hospitality | 2019 |
| Arrk Property Investments Ltd | Real estate | 2023 |
| ARS Anglian Diesels Limited | Manufacturing | 2008 |
| Art by Alicia Lauren Limited | Other services | 2015 |
| AS Commercial Services Ltd | Manufacturing | 2021 |
| Ashleigh Digital Limited | Manufacturing | 2014 |
| Ashleigh Group Holdings Limited | Administrative & support | 2023 |
| Ashleighsigns Limited | Manufacturing | 1977 |
| Ashwood Court (Normanton) Management Company Limited | Real estate | 2002 |
| Asian Kitchen 156 Limited | Hospitality | 2023 |
| Atari Homes Limited | Households | 2024 |
| ATB Maintenance Limited | Construction | 2019 |
| Athi UK Retail Ltd | Wholesale & retail | 2024 |
| ATN Limited | Wholesale & retail | 1980 |
| AUK Transport Ltd | Transport & logistics | 2024 |
| Aurra Tanning Ltd | Other services | 2026 |
| Auxilium Consultancy Ltd | Professional & scientific | 2022 |
| Aveive Ltd | Wholesale & retail | 2009 |
| Aventus Properties Ltd | Other services | 2015 |
| AW Industrial Roofing Services Ltd | Construction | 2026 |
| Awning Bargains Ltd | Wholesale & retail | 2024 |
| Axelbuild Ltd | Construction | 2014 |
| Axelson Consulting Limited | Professional & scientific | 2025 |
| Aztec Valeting & Detailing Ltd | Wholesale & retail | 2021 |
| B V Cooke & SON Ltd | Other services | 2015 |
| B&C Housing Ltd | Real estate | 2024 |
| B.S.B. (Normanton) Limited | Wholesale & retail | 1961 |