| A2Z Plumbing & DIY Limited | Wholesale & retail | 2010 |
| A2Z Travel Ltd | Transport & logistics | 2023 |
| A2ZFIX Ltd | Wholesale & retail | 2025 |
| A3 Health Ltd | Wholesale & retail | 2022 |
| A4 Properties Yorkshire Ltd | Real estate | 2026 |
| A4MOTORS Ltd | Wholesale & retail | 2016 |
| A6 Motors Limited | Wholesale & retail | 2014 |
| A62 Ltd | Professional & scientific | 2024 |
| A64 Investments Ltd | Real estate | 2022 |
| A64 Properties Ltd | Real estate | 2025 |
| AA Building Surveying and Services Limited | Administrative & support | 2015 |
| AA Caravan & Trailer Services Ltd | Manufacturing | 2018 |
| AA Collective Enterprises Limited | Wholesale & retail | 2026 |
| AA Constuction Ltd | Construction | 2026 |
| AA Consultancy Leeds Limited | Professional & scientific | 2019 |
| AA Fine Dwellings Ltd | Real estate | 2023 |
| AA GAS Services Yorkshire Ltd | Construction | 2022 |
| AA General Wholesale Ltd | Wholesale & retail | 2024 |
| AA Private Care Limited | Health & social care | 2016 |
| AA Professional Cleaning Solutions Ltd | Construction | 2018 |
| AA Property Solutions (Yorkshire) Ltd | Real estate | 2018 |
| AA Solutions Limited | Wholesale & retail | 2011 |
| AA Steel Construction Limited | Construction | 2020 |
| AA Whiteways Auto Breakers Limited | Water & waste | 2013 |
| AA Wireworks Ltd | Transport & logistics | 2024 |
| AAA (Leeds) Ltd | Hospitality | 2020 |
| AAA Associates Limited | Other services | 2022 |
| AAA Engineering Consulting Ltd | Professional & scientific | 2023 |
| AAA Grease Guru Limited | Information & communication | 2016 |
| AAA Holdings Limited | Real estate | 2000 |
| AAA Investment Properties Limited | Real estate | 2025 |
| AAA MAX Limited | Hospitality | 2025 |
| AAA Property Holding Group Ltd | Financial services | 2026 |
| AAA Property Investments Limited | Real estate | 2019 |
| AAA Trends Hub Ltd | Wholesale & retail | 2026 |
| AAAK478 Ltd | Real estate | 2025 |
| Aaamya Limited | Transport & logistics | 2024 |
| AAB Audit & Accountancy Limited | Professional & scientific | 1997 |
| AAB Customs Limited | Professional & scientific | 2018 |
| AAB Innovation Taxes Limited | Professional & scientific | 2013 |
| AAB Professional Trustees LLP | | 2009 |
| AAB Specialist Solutions Limited | Health & social care | 2024 |
| AAB Team Limited | Administrative & support | 2013 |
| Aabs Logistics Limited | Transport & logistics | 2026 |
| Aadam HN Ltd | Wholesale & retail | 2023 |
| Aadya & Adhvik Ltd | Information & communication | 2020 |
| Aaez Limited | Professional & scientific | 2026 |
| Aafm Group Limited | Other services | 2020 |
| AAH Investments Limited | Professional & scientific | 2013 |
| AAH Planning Ltd | Professional & scientific | 2016 |
| AAH Property Ltd | Construction | 2010 |
| AAH Trading Ltd | Information & communication | 2019 |
| AAI Forwarding Limited | Transport & logistics | 2005 |
| AAI Shree Khodiyar Ltd | Wholesale & retail | 2024 |
| AAI Solutions Services Ltd | Administrative & support | 2024 |
| Aaizas Enterprise Limited | Hospitality | 2026 |
| AAK Accountancy Services Limited | Professional & scientific | 2011 |
| Aalanzs Recruitment Services Ltd | Administrative & support | 2017 |
| Aalin (Church Lawton) Limited | Construction | 2020 |
| Aaliyah Valeting Ltd | Other services | 2019 |
| AAM Advisory Limited | Professional & scientific | 2013 |
| AAM Digital Ltd | Information & communication | 2017 |
| AAM Optical Ltd | Health & social care | 2026 |
| Aaminah Property Ltd | Real estate | 2026 |
| Aamitic & Co Limited | Wholesale & retail | 2024 |
| Aamya Limited | Financial services | 2025 |
| Aanda Bukhari Ltd | Real estate | 2025 |
| Aanya & Co Limited | Wholesale & retail | 2025 |
| Aanya Restaurant Limited | Hospitality | 2019 |
| Aapmor Ltd | Information & communication | 2023 |
| Aaps Property Holdings Limited | Real estate | 2026 |
| Aardvark Abacus Limited | Professional & scientific | 2019 |
| Aardvark Analytics Ltd | Information & communication | 2022 |
| Aarishkhan Limited | Wholesale & retail | 2022 |
| Aarkan Jnpn Ltd | Wholesale & retail | 2025 |
| Aarken Consultancy Services Limited | Professional & scientific | 2017 |
| Aarnikotka Limited | Financial services | 2021 |
| Aaron Auto Electrics Limited | Wholesale & retail | 2000 |
| Aaron Kirkby Visuals Ltd | Information & communication | 2023 |
| Aaron Leeds Limited | Construction | 2020 |
| Aart Academy Ltd | Education | 2023 |
| Aart Accountants Ltd | Professional & scientific | 2023 |
| Aarti Limited | Hospitality | 2022 |
| Aarva Health and Wellness Clinic Limited | Health & social care | 2025 |
| AAS Properties Leeds Ltd | Real estate | 2023 |
| AAS Realisations (2025) Limited | Financial services | 2020 |
| Aashen Catering Ltd | Wholesale & retail | 2023 |
| Aasphysical Limited | Arts & recreation | 2019 |
| Aavaas Properties Limited | Real estate | 2020 |
| Aayra Ltd | Wholesale & retail | 2026 |
| Aayush Technologies Ltd | Information & communication | 2011 |
| AB Bloom Tech Ltd | Information & communication | 2026 |
| AB Building Contractors Yorkshire Ltd | Construction | 2013 |
| AB Cars (Leeds) Ltd | Transport & logistics | 2016 |
| AB Cars Garforth Ltd | Transport & logistics | 2021 |
| AB Cash N Carry Ltd | Wholesale & retail | 2025 |
| AB Controls and Robotics Ltd | Professional & scientific | 2023 |
| AB Finance Limited | Financial services | 2016 |
| AB Furniture Limited | Wholesale & retail | 2026 |
| AB Insolvency Limited | Administrative & support | 2018 |