| ALL in Building Ltd | Construction | 2025 |
| ALL in Methodology Limited | Education | 2026 |
| ALL Powers Sales Ltd | Wholesale & retail | 2024 |
| ALL Psychology Ltd | Professional & scientific | 2023 |
| ALL Saints Support Complex Care Services Ltd | Administrative & support | 2023 |
| ALL Secure Electrical Limited | Administrative & support | 2006 |
| ALL Star Accountants Ltd | Professional & scientific | 2022 |
| ALL Star Homes Limited | Real estate | 2018 |
| ALL Time Watch Repairs Ltd | Wholesale & retail | 2020 |
| ALL Together Education Recruitment Ltd | Administrative & support | 2024 |
| ALL Waste Removed Skiphire Limited | Water & waste | 2025 |
| ALL Within YOU Limited | Other services | 2022 |
| All-Tag Europe Ltd. | Administrative & support | 2003 |
| ALL4DOORS Ltd | Construction | 2020 |
| Allan James Motors Limited | Wholesale & retail | 2009 |
| Allcover Flooring & Painting Ltd | Construction | 2024 |
| Alldis Atlantic Ltd | Information & communication | 2025 |
| Alldis MOT Centre Limited | Wholesale & retail | 2016 |
| Allegro Asset Holding Limited | Financial services | 2022 |
| Allen Court (Denton) Limited | Real estate | 2007 |
| Allens Accountants (Holdings) Limited | Financial services | 2013 |
| Allergy Resolutions Limited | Health & social care | 2008 |
| Allfp Ltd | Real estate | 2024 |
| Allgas Services Limited | Manufacturing | 2003 |
| Alli's Hair Company Limited | Administrative & support | 2017 |
| Alliance Consulting Ltd | Professional & scientific | 2024 |
| Alliance of Global Fastener Technology Specialists Limited | Other services | 2023 |
| Allied Beau Consultancy Limited | Professional & scientific | 2024 |
| Allied Colloids Group Limited | Professional & scientific | 1948 |
| Allied Global Marketing Limited | Professional & scientific | 2018 |
| Allied Health Directories Limited | Information & communication | 2026 |
| Allied Publicity Services (Manchester) Limited | Administrative & support | 1961 |
| Allingham Stuart Framers Limited | Wholesale & retail | 2002 |
| Allinson Stone Limited | Wholesale & retail | 1968 |
| Allison Pike Partnership Limited | Professional & scientific | 1999 |
| Allite Enterprises Ltd | Wholesale & retail | 2013 |
| Allman Consulting Ltd | Health & social care | 2026 |
| Allnet Properties Group Limited | Real estate | 2023 |
| Allora Properties Ltd | Real estate | 2025 |
| Alloy Doctor & Detailing Ltd | Wholesale & retail | 2024 |
| Allstars Mobile Valeting Limited | Wholesale & retail | 2024 |
| Allstone Fireplaces Limited | Extraterritorial | 2010 |
| Allwood Fireplaces Limited | Wholesale & retail | 2000 |
| Allyrosalie Celebrant Ltd | Other services | 2025 |
| Almac Properties Ltd. | Construction | 1997 |
| Almajbas Ltd | Real estate | 2026 |
| Almond and Lenehan Ltd | Professional & scientific | 2024 |
| Almond Property Group Limited | Real estate | 2020 |
| Almond PUB 5 Ltd | Hospitality | 2025 |
| Almusaffa Limited | Wholesale & retail | 2024 |
| Alnetty Consulting Ltd | Professional & scientific | 2025 |
| ALO Marketing Limited | Wholesale & retail | 2025 |
| Along the Wall Ltd | Wholesale & retail | 2026 |
| Aloore Services Ltd | Health & social care | 2025 |
| Alora Coffee Ltd | Hospitality | 2025 |
| Alowenz Limited | Health & social care | 2019 |
| Alpa Heating(Stockport)Limited | | 1973 |
| Alpargatas UK Limited | Wholesale & retail | 2008 |
| Alpenvillage Ltd | Real estate | 2016 |
| Alperton Projects 3 Ltd | Construction | 2015 |
| Alpha Accessories MCR Ltd | Wholesale & retail | 2020 |
| Alpha Beta Capital Limited | Professional & scientific | 2012 |
| Alpha Beta Property Limited | Real estate | 2021 |
| Alpha Contracts London Ltd | Construction | 2018 |
| Alpha FSC Limited | Administrative & support | 2025 |
| Alpha Legal Services Ltd | Hospitality | 2010 |
| Alpha MAN Ltd | Wholesale & retail | 2024 |
| Alpha Mews (Whaley Bridge) Limited | Real estate | 2008 |
| Alpha Mortgages Limited | Financial services | 2016 |
| Alpha Omega Finances Limited | Real estate | 2016 |
| Alpha Property Investments Limited | Real estate | 1965 |
| Alpha Rail S&T Limited | Professional & scientific | 2009 |
| Alpha Roofing and Development Ltd | Construction | 2024 |
| Alpha Synergie Consulting Ltd | Administrative & support | 2012 |
| Alphalytix Limited | Information & communication | 2023 |
| Alphaway Limited | | 1992 |
| Alphia Access Ltd | Construction | 2025 |
| Alphin Technologies Limited | Professional & scientific | 2018 |
| Alpina Ltd | Administrative & support | 2014 |
| Alpine Accountancy Manchester Limited | Professional & scientific | 2017 |
| Alpine Psychology Limited | Health & social care | 2021 |
| Alpinemarch Property Management Limited | Real estate | 2004 |
| Alpingreen Ltd | Administrative & support | 2014 |
| Alreco Limited | Wholesale & retail | 2014 |
| Alsaif Properties Limited | Real estate | 2025 |
| Alshahed Limited | Health & social care | 2022 |
| Alstan Construction Limited | Construction | 2021 |
| ALT I Automatisering Limited | Extraterritorial | 2013 |
| ALT Trading Ltd | Extraterritorial | 2024 |
| Altafulla Partners UK Limited | Professional & scientific | 2025 |
| Altaia Ltd | Professional & scientific | 2023 |
| Altair Real Estate Limited | Real estate | 2021 |
| Altair Systems Limited | Manufacturing | 2002 |
| Altar Vision Ltd | Administrative & support | 2025 |
| Altasu Recruitment Group Limited | Administrative & support | 2023 |
| Altazon Ltd | Wholesale & retail | 2025 |
| Altcom 410 Limited | Other services | 2006 |
| Alternative Propositions Limited | Financial services | 2012 |
| Alternatives Therapy Ltd | Other services | 2013 |
| Altertherm Facilities Ltd | Construction | 2010 |