| Anglo Content Ltd | Professional & scientific | 2019 |
| Anthony Higgins Transport Limited | Transport & logistics | 2010 |
| Anthony Thompson (Trumpet) Limited | Arts & recreation | 1998 |
| Anushagroupofcompanies Limited | Hospitality | 2024 |
| Anvast UK Limited | Professional & scientific | 2010 |
| Aobclean Ltd | Administrative & support | 2024 |
| Apex Joinery Castleford Limited | Construction | 2025 |
| Apex Steelwork & Fabrication Ltd | Manufacturing | 2026 |
| Apollo Town Planning Ltd | Professional & scientific | 2018 |
| Apptronics Limited | Information & communication | 2009 |
| AQ Global Trading Limited | Wholesale & retail | 2022 |
| Aqua Plastics Limited | Manufacturing | 2009 |
| AR Artworks Limited | Wholesale & retail | 2025 |
| AR Drywall & Interiors Ltd | Construction | 2025 |
| AR Drywall Group Ltd | Construction | 2023 |
| ARB Civils & Groundworks Limited | Construction | 2014 |
| Arbor Vitae (UK) Limited | Financial services | 2013 |
| Arbor Vitae Limited | Manufacturing | 1999 |
| Arcade Clearance UK Ltd | Wholesale & retail | 2026 |
| ARD (Commercial) Limited | Professional & scientific | 2013 |
| Armitage and FOX Limited | Hospitality | 2017 |
| Arrow Cars and Minibuses Limited | Transport & logistics | 2019 |
| Arrow Freight Ltd | Transport & logistics | 2016 |
| Arrow Generics Limited | Manufacturing | 2000 |
| Art Dessert Ltd | Manufacturing | 2025 |
| Artur a Services Ltd | Transport & logistics | 2023 |
| Artursobo Ltd | Wholesale & retail | 2025 |
| Arundel GAS & Plumbing Ltd | Construction | 2022 |
| ASH Construction Properties LLP | | 2011 |
| Ashton-Nelson Ltd | Hospitality | 2023 |
| Ashworth Inns Ltd | Hospitality | 2018 |
| ASI Security Ltd | Extraterritorial | 2014 |
| ASL Construction Services Yorkshire Ltd | Construction | 2024 |
| Astra Blinds Limited | Manufacturing | 2011 |
| Asumah Group Ltd | Construction | 2021 |
| Atdw Ltd | Wholesale & retail | 2019 |
| Atiiga and Wintis Ltd | Hospitality | 2026 |
| Atkinson Family Estates Ltd | Real estate | 2026 |
| Atkinson Living Limited | Real estate | 2026 |
| Atkinsons Accommodation Limited | Households | 2025 |
| Atkinsons Fencing and Decking Centres Limited | Manufacturing | 2004 |
| Atkinsons Home and Garden Limited | Manufacturing | 2022 |
| ATM Transport Solutions Ltd | Professional & scientific | 2009 |
| ATP Solutions Ltd | Information & communication | 2023 |
| Atpac Properties Ltd | Real estate | 2025 |
| Auden Mckenzie (Pharma Division) Limited | Manufacturing | 1999 |
| Auden Mckenzie Holdings Limited | Financial services | 2012 |
| August Transport Services Limited | Transport & logistics | 2019 |
| Aurelian Investments Ltd | Financial services | 2025 |
| Austen Industries Ltd | Professional & scientific | 2019 |
| Auto Buyer Solutions Ltd | Wholesale & retail | 2020 |
| Autokraft Cosmetic Car Repairs Ltd | Wholesale & retail | 2002 |
| Automatic Process Limited | Education | 2003 |
| Automotive Sense Limited | Wholesale & retail | 2012 |
| AW Properties (Yorkshire) Ltd | Construction | 2024 |
| Ayti Trans Ltd | Transport & logistics | 2022 |
| AZI Beauty Ltd | Other services | 2026 |
| B & D Autos Limited | Wholesale & retail | 2007 |
| B & H Urban Developments Ltd | Real estate | 2025 |
| B & R Building Contractors Ltd | Construction | 2023 |
| Baaj Capital LLP | | 2019 |
| Baaj Finance Limited | Professional & scientific | 2021 |
| Baaj Investments Limited | Professional & scientific | 2021 |
| Baaj Properties Limited | Real estate | 2021 |
| Babar Awan K9 Ltd | Other services | 2025 |
| Backnineco Ltd | Wholesale & retail | 2026 |
| BAD Bambi Ltd | Wholesale & retail | 2020 |
| Bai'Lu Hair Limited | Other services | 2023 |
| Bailwink Solutions Ltd | Information & communication | 2025 |
| Bakehouse Three Nine Ltd | Manufacturing | 2021 |
| Balancebest Properties Limited | Real estate | 2012 |
| Balint Ltd | Transport & logistics | 2013 |
| Balmorality Business Connections Limited | Administrative & support | 2024 |
| Bamboomn UK Ltd | Wholesale & retail | 2020 |
| Bandol Property Ltd. | Real estate | 2018 |
| Bang Design Limited | Professional & scientific | 2011 |
| Bare Concept Ltd | Professional & scientific | 2026 |
| Barker & Hodgson Electrical Contractors Limited | Construction | 2022 |
| Bars Clubs Pubs International Ltd | Professional & scientific | 2018 |
| Bartlemas Ltd | Professional & scientific | 2020 |
| Bashall Investments Limited | Real estate | 2022 |
| Bastone Limited | Financial services | 2024 |
| BAT Logistics Ltd | Wholesale & retail | 2013 |
| Batesons Bakery Ltd | Manufacturing | 2005 |
| Battye's (Castleford) Limited | Hospitality | 2018 |
| Bawa Property Trading Ltd | Real estate | 2025 |
| Bawa Ventures Ltd | Transport & logistics | 2022 |
| Baxters Refrigerants Ltd | Wholesale & retail | 2021 |
| BB Property Rentals Ltd | Households | 2024 |
| BBS Car Sales Ltd | Wholesale & retail | 2017 |
| BDS Electrical FM Limited | Construction | 2013 |
| BDS Group Limited | Administrative & support | 2021 |
| Beat (UK) Limited | Construction | 2009 |
| Beau Inns Ltd | Hospitality | 2025 |
| Beaupix Power Limited | Construction | 2016 |
| Bechamel Market Kitchen Limited | Hospitality | 2017 |
| Beckett & Savery Development Ltd | Real estate | 2018 |
| Beckfield Leisure Ltd | Administrative & support | 2025 |
| Becpro Ltd | Real estate | 2025 |
| Beersaver (West Yorkshire) Ltd | Administrative & support | 2025 |