| Alpha Card Print Finishing Ltd | Manufacturing | 2022 |
| Alpha Cleaning Solutions Limited | Administrative & support | 2020 |
| Alpha Electrical Group Ltd | Construction | 2021 |
| Alpha FAB Limited | Real estate | 2015 |
| Alpha Flooring Solutions (Yorkshire) Ltd | Construction | 2023 |
| Alpha General Trading Limited | Wholesale & retail | 2006 |
| Alpha House (Bradford) Limited | Real estate | 2023 |
| Alpha Ideas Ltd | Real estate | 2020 |
| Alpha IT Consultancy Services Limited | Information & communication | 2020 |
| Alpha Leeds Ltd | Administrative & support | 2026 |
| Alpha Machinery Ltd | Professional & scientific | 2020 |
| Alpha Media Solutions Ltd | Manufacturing | 2006 |
| Alpha Moisture Systems Limited | Manufacturing | 2000 |
| Alpha Offshore Engineering and Management Services Limited | Manufacturing | 1985 |
| Alpha OIL Services Ltd | Water & waste | 2026 |
| Alpha Oilfield Equipment Limited | Manufacturing | 1982 |
| Alpha Omega Consultancy Ltd | Professional & scientific | 2020 |
| Alpha Online Ltd | Wholesale & retail | 2020 |
| Alpha Optical Distribution Ltd | Wholesale & retail | 2011 |
| Alpha PM Limited | Other services | 2017 |
| Alpha Property Acquisitions Ltd | Real estate | 2023 |
| Alpha Property Consultancy Services Ltd | Real estate | 2023 |
| Alpha Property Holdings (East) Limited | Financial services | 2013 |
| Alpha Property Media Ltd | Information & communication | 2025 |
| Alpha Reader Limited | Education | 2018 |
| Alpha Shindara Associates Limited | Professional & scientific | 2010 |
| Alpha Squared Data Solutions Limited | Information & communication | 2018 |
| Alpha Taurus Ventures Limited | Professional & scientific | 2023 |
| Alpha Ventura Ltd | Wholesale & retail | 2022 |
| Alpha-Beta Vickers Limited | Professional & scientific | 1936 |
| Alphabuy Limited | Other services | 2021 |
| Alphacon AI Limited | Wholesale & retail | 2026 |
| Alphaglaze Limited | Wholesale & retail | 1982 |
| Alphanso Renewals Ltd | Construction | 2024 |
| Alphatec Industries Ltd | Manufacturing | 2020 |
| Alpine Board Limited | Wholesale & retail | 2009 |
| Alpine Brickwork Limited | Construction | 2025 |
| Alpine Hire & Sales Limited | Administrative & support | 2017 |
| Alpine Medical Ltd | Health & social care | 2020 |
| Alpine Property & Letting Ltd | Real estate | 2025 |
| Alpine Soft Drinks (U.K.) Limited | Manufacturing | 1950 |
| Alpine Software Limited | Information & communication | 1998 |
| Alpine Solar Solutions Limited | Construction | 2023 |
| Alpine Upvc Specialists Limited | Construction | 2007 |
| Alpine Window and Doors Ltd | Construction | 2019 |
| Alpino Industries Ltd | Construction | 2024 |
| Alpol Leeds Ltd | Wholesale & retail | 2024 |
| Alpol Utilities Ltd | Construction | 2020 |
| ALR Engineering Ltd | Other services | 2021 |
| Alrawi Knights Ltd | Wholesale & retail | 2025 |
| ALS Consultancy Ltd | Information & communication | 2025 |
| ALS Corporate Solutions Limited | Professional & scientific | 2011 |
| ALS Developments (UK) Limited | Construction | 2009 |
| Alsa Group Limited | Wholesale & retail | 2017 |
| Alsala Gambling Compliance Consultancy Ltd | Professional & scientific | 2026 |
| Alscient Limited | Information & communication | 2010 |
| Alshamari Limited | Professional & scientific | 2018 |
| Alshwaiki Deliveries Ltd | Transport & logistics | 2026 |
| Alsoor Dena Petrochemical Ltd | Manufacturing | 2022 |
| ALT Active Ltd | Education | 2025 |
| ALT Heating Solutions Ltd | Construction | 2016 |
| Alta Property Ltd | Real estate | 2017 |
| Altaf Smiles Limited | Health & social care | 2014 |
| Altalia Ltd | Hospitality | 2024 |
| Altas Real Estate Ltd | Real estate | 2019 |
| Alteda Consulting Ltd | Professional & scientific | 2023 |
| Altegra Integrated Solutions Limited | Manufacturing | 1993 |
| Altelium Ltd | Information & communication | 2018 |
| Alterations, Renovations & Demolitions Ltd | Construction | 2020 |
| Altered Image Gymnasium Ltd | Arts & recreation | 2018 |
| Alternative Grill Ltd | Hospitality | 2024 |
| Alternative Lifestyle Limited | Wholesale & retail | 2001 |
| Alternative Storage Systems Ltd | Construction | 2019 |
| Alternative Windows (Leeds) Holdings Limited | Financial services | 2019 |
| Alternativexp Limited | Education | 2026 |
| Alterrain Clothing Ltd | Wholesale & retail | 2025 |
| Altex (UK) Limited | Wholesale & retail | 1982 |
| Altex Holdings Bradford Limited | Financial services | 2010 |
| Althea Beauty Ltd | Wholesale & retail | 2017 |
| Altiar Limited | Information & communication | 2014 |
| Altimmune UK Limited | Professional & scientific | 1992 |
| Altiora Capital Limited | Financial services | 2025 |
| Alto Coaching and HR Ltd | Professional & scientific | 2013 |
| Alton Cars Holdings Limited | Financial services | 2021 |
| Alton Cars Limited | Manufacturing | 1979 |
| Altor Construction Ltd | Construction | 2021 |
| Altor Facilities Management Ltd | Construction | 2022 |
| Altor Projects Limited | Construction | 2025 |
| Altrix Brands Ltd | Wholesale & retail | 2026 |
| Altstart Ltd | Wholesale & retail | 2020 |
| Altus Media (Eleven) Limited | Information & communication | 2014 |
| Altus Media (Five) Limited | Administrative & support | 2012 |
| Altus Media (Four) Limited | Administrative & support | 2012 |
| Altus Media (Nine) Limited | Administrative & support | 2013 |
| Altus Media (SIX) Limited | Administrative & support | 2013 |
| Altus Media (TEN) Limited | Information & communication | 2013 |
| Altus Media (Three) Limited | Administrative & support | 2012 |
| Altus Media (Two) Limited | Administrative & support | 2012 |
| Altwork Global Ltd | Administrative & support | 2022 |
| Alufast National Limited | Manufacturing | 2026 |