| Alead Limited | Professional & scientific | 2013 |
| Alert Innovation Ltd | Administrative & support | 1994 |
| Alexander Reid Ltd | Administrative & support | 2012 |
| Alexdent Limited | Professional & scientific | 2019 |
| Alfa Collective Ltd | Wholesale & retail | 2020 |
| Algarve Living Ltd | Construction | 2016 |
| ALI and Sons Assets Ltd | Real estate | 2025 |
| ALI Transport & Autos Ltd | Wholesale & retail | 2024 |
| Alice Hopkins Ltd | Wholesale & retail | 2021 |
| Alina Johnson Ltd | Wholesale & retail | 2026 |
| Alison Jaynes Cleaning Services Limited | Administrative & support | 2024 |
| Alison Wilson Associates Limited | Health & social care | 2013 |
| Aliyza Care Services Limited | Health & social care | 2026 |
| Alkimos Developments Limited | Construction | 2021 |
| ALL Floors Keighley Ltd | Wholesale & retail | 2023 |
| ALL in Mart Limited | Wholesale & retail | 2025 |
| ALL Keys Ltd | Wholesale & retail | 2019 |
| ALL Seasons Four Seasons Limited | Hospitality | 2018 |
| ALL Things Sorted Limited | Extraterritorial | 2010 |
| Allan Thompson (Farms) Limited | Agriculture & fishing | 1963 |
| Allen & Cole Properties Limited | Real estate | 2025 |
| Allerton Trade Centre Limited | Wholesale & retail | 2013 |
| Allied Storage Limited | Transport & logistics | 2025 |
| Alma Air Ltd | Construction | 2024 |
| Almad Solutions Limited | Information & communication | 2013 |
| Alpha Real Estate Holdings Limited | Real estate | 2024 |
| Alta Vista Wellness Ltd | Other services | 2026 |
| Altaf Holdings Limited | Real estate | 2018 |
| Altar Properties Yorkshire Ltd | Hospitality | 2019 |
| Aluminium Bronze Valves Limited | Professional & scientific | 2005 |
| Aluminium Profiles UK Ltd | Professional & scientific | 2013 |
| Always Forever Bridal Ltd | Wholesale & retail | 2024 |
| AM & S Property Ltd | Real estate | 2024 |
| AM Hussain Property Limited | Real estate | 2024 |
| AM Properties BFD Limited | Real estate | 2025 |
| Amaans Steak House Ltd | Hospitality | 2026 |
| Aman Khan Limited | Financial services | 2022 |
| Amason Developers Ltd | Construction | 2024 |
| Amateur Box Office Ltd | Information & communication | 2010 |
| Ambience of Yorkshire Ltd | Construction | 2023 |
| American Sandwich Bar Limited | Hospitality | 2024 |
| Amethyst Secure Ltd | Administrative & support | 2023 |
| Amie's Aesthetics & Training Academy Limited | Other services | 2025 |
| Amin Properties Yorkshire Limited | Real estate | 2024 |
| Amira House Properties Ltd | Real estate | 2021 |
| AMK Real Estate Ltd | Real estate | 2020 |
| AML Aesthetics Ltd | Health & social care | 2020 |
| AML Professional Services Consulting Limited | Professional & scientific | 2010 |
| AMR Travel Ltd | Transport & logistics | 2025 |
| Amron Enterprises Limited | Real estate | 2000 |
| Amsjk Limited | Real estate | 2024 |
| AMY Berry Property Limited | Real estate | 2022 |
| AMY BOY Consulting Ltd | Professional & scientific | 2023 |
| AMZ Developments Ltd | Real estate | 2022 |
| Ana's Tribe Community Interest Company | Education | 2026 |
| Anashehealth Care Ltd | Health & social care | 2015 |
| Anchal Puri Ltd | Health & social care | 2024 |
| Anchor Logs Limited | Wholesale & retail | 2010 |
| AND Chocolate Limited | Hospitality | 2012 |
| Anderson Food Solutions Ltd | Professional & scientific | 2023 |
| Anderton Circlips Limited | Manufacturing | 1939 |
| Andi Services Ltd | Administrative & support | 2023 |
| Andola Fibres Limited | Professional & scientific | 1973 |
| Andrew Holland Law Limited | Professional & scientific | 2003 |
| Andrew Investments Limited | Hospitality | 2009 |
| Andrew Scott Supplies Ltd | Wholesale & retail | 2019 |
| Andrew Thompson Building Services Ltd | Construction | 2026 |
| Andrews Online Limited | Wholesale & retail | 2021 |
| Andy Guest Jetters Limited | Wholesale & retail | 2013 |
| Angel Alpacas Limited | Agriculture & fishing | 2019 |
| Angila Care Ltd | Health & social care | 2017 |
| Animal Magic Family Ltd | Other services | 2019 |
| Animal Magic Family Pet Retreat Ltd | Hospitality | 2022 |
| Aniq Laiq Ltd | Wholesale & retail | 2025 |
| ANJ Motors Ltd | Wholesale & retail | 2019 |
| Anker Partners LLP | | 2009 |
| Annison Ltd | Information & communication | 2012 |
| Anodaram Ltd | Information & communication | 2020 |
| Another Cupboard Limited | Manufacturing | 2026 |
| Anthony Oxford Fit Hub Limited | Arts & recreation | 2024 |
| Antrio Investments Limited | Real estate | 2022 |
| Anum Malik Ltd | Health & social care | 2019 |
| Anwar's Food Ltd | Hospitality | 2017 |
| AOV Systems Ltd | Other services | 2018 |
| AP Orthodontics Ltd | Health & social care | 2021 |
| APC Windows LLP | | 2007 |
| Apex Car Parts Ltd | Wholesale & retail | 2023 |
| Apex Letting Solutions Ltd | Real estate | 2024 |
| Apex Plumbing & Building Solutions Ltd | Construction | 2025 |
| Apex Taekwondo Ltd | Education | 2025 |
| Apotheca Healthcare Ltd | Health & social care | 2022 |
| App Foundry Ltd | Information & communication | 2024 |
| Apple Tree Clothing Limited | Wholesale & retail | 2018 |
| Applegarth Garden Management Company Limited | Real estate | 2006 |
| Approachable Finance Ltd | Financial services | 2011 |
| Approachable Property Ltd | Real estate | 2017 |
| APR Accountancy Services Limited | Professional & scientific | 2003 |
| Apso Digital Mill Ltd | Information & communication | 2022 |
| Aqsa Cars Ltd | Transport & logistics | 2024 |
| Aqsa Management Services Limited | Other services | 2014 |