| Alnair Management Solutions Ltd | Real estate | 2025 |
| Alnbm Ltd | Professional & scientific | 2020 |
| Alneera Ltd | Wholesale & retail | 2025 |
| Alnoor & Co Properties Ltd | Real estate | 2025 |
| Alnoor Education Foundation Limited | Education | 2009 |
| Alnoor International Ltd | Wholesale & retail | 2025 |
| Alnoor Mart Ltd | Wholesale & retail | 2025 |
| Alnoor Transporters Ltd | Wholesale & retail | 2026 |
| Alnora Holdings Ltd | Financial services | 2026 |
| Alnors Trading Ltd | Wholesale & retail | 2019 |
| Alnz Limited | Professional & scientific | 2013 |
| Alocit International Limited | Administrative & support | 1995 |
| Aloft Supplier Ltd | Wholesale & retail | 2024 |
| Alogik Ltd | Wholesale & retail | 2023 |
| Aloha Travels Ltd | Administrative & support | 2025 |
| Aloin Builders Limited | Construction | 1979 |
| Alom Associates Ltd | Administrative & support | 2016 |
| Alomora UK Limited | Administrative & support | 2010 |
| Alomrani Ltd | Transport & logistics | 2025 |
| Alouatta Ltd | Wholesale & retail | 2022 |
| Alouna Recruitment Group Limited | Administrative & support | 2021 |
| Aloura Events Ltd | Professional & scientific | 2026 |
| Aloura Support Ltd | Health & social care | 2025 |
| ALP (Europe) Limited | Manufacturing | 2000 |
| Alparo Ltd | Wholesale & retail | 2024 |
| Alpec Ltd | Professional & scientific | 2017 |
| Alpex Cladding Ltd | Construction | 2019 |
| Alpha & Eagle Cars Limited | Transport & logistics | 2014 |
| Alpha 123 Limited | Other services | 2025 |
| Alpha 2 Accountancy Services Limited | Professional & scientific | 2021 |
| Alpha 777 Limited | Professional & scientific | 2018 |
| Alpha 888 Ltd | Hospitality | 2017 |
| Alpha Accountancy Birmingham Ltd | Information & communication | 2023 |
| Alpha Accountancy Services Ltd | Professional & scientific | 2022 |
| Alpha Accountants and Tax Advisors Ltd | Professional & scientific | 2008 |
| Alpha Air Travel Limited | Administrative & support | 2024 |
| Alpha and Omega Holdings Ltd | Real estate | 2020 |
| Alpha Bargains Ltd | Wholesale & retail | 2023 |
| Alpha Bravo K9 Security Ltd | Administrative & support | 2019 |
| Alpha Building and Construction Limited | Construction | 2010 |
| Alpha Businesses and Automotive Ltd | Wholesale & retail | 2025 |
| Alpha Canine Security Services Ltd | Administrative & support | 2023 |
| Alpha Care #1 Limited | Health & social care | 2023 |
| Alpha Care Consultancy Limited | Professional & scientific | 2025 |
| Alpha Claims & Hire Ltd | Financial services | 2014 |
| Alpha Claims Ltd | Financial services | 2023 |
| Alpha Customs Ltd | Wholesale & retail | 2014 |
| Alpha Direct Limited | Wholesale & retail | 2021 |
| Alpha Facilities L Ltd | Administrative & support | 2025 |
| Alpha Floor Maintenance Equipment Ltd | Administrative & support | 2004 |
| Alpha G Trans Ltd | Transport & logistics | 2022 |
| Alpha Gateway Ltd | Real estate | 2020 |
| Alpha Global Works Ltd | Financial services | 2021 |
| Alpha Horizon Consulting UK Ltd | Professional & scientific | 2025 |
| Alpha House (Properties) Limited | Real estate | 1996 |
| Alpha Housing Security Ltd | Administrative & support | 2025 |
| Alpha Installation Services Ltd | Construction | 2017 |
| Alpha Laser UK Limited | Wholesale & retail | 2026 |
| Alpha Logistics Courier Services Ltd | Transport & logistics | 2023 |
| Alpha Medex Ltd | Wholesale & retail | 2019 |
| Alpha Occasions Ltd | Other services | 2020 |
| Alpha One Fire Safety Limited | Professional & scientific | 2016 |
| Alpha Performance Repair Ltd | Wholesale & retail | 2022 |
| Alpha Pro Consultancy Ltd | Professional & scientific | 2021 |
| Alpha Properties & Maintenance Ltd | Construction | 2025 |
| Alpha Relocation Limited | Hospitality | 2025 |
| Alpha Rental Group Ltd | Financial services | 2013 |
| Alpha Sameday Ltd | Transport & logistics | 2023 |
| Alpha Sana Ltd | Financial services | 2019 |
| Alpha Scar Ltd | Wholesale & retail | 2024 |
| Alpha Security 24/7 Limited | Administrative & support | 2023 |
| Alpha Shelter Ltd | Administrative & support | 2024 |
| Alpha SIA Training Academy Ltd | Education | 2017 |
| Alpha Sigmma Limited | Wholesale & retail | 2025 |
| Alpha Supportive Care Ltd | Health & social care | 2023 |
| Alpha Tax Solutions Limited | Professional & scientific | 2020 |
| Alpha Tech Labs Ltd | Information & communication | 2026 |
| Alpha Technologies U.K. | Wholesale & retail | 1996 |
| Alpha Tiles Worldwide Limited | Other services | 2011 |
| Alpha Two Ltd | Professional & scientific | 2024 |
| Alpha Water Limited | Real estate | 2020 |
| Alpha West Midlands UK Limited | Wholesale & retail | 2019 |
| Alpha Wholesale Limited | Financial services | 2008 |
| Alpha-I Business Consulting (UK) Limited | Education | 2012 |
| Alphabay Ltd | Financial services | 2026 |
| Alphabet Estates Ltd | Real estate | 2021 |
| Alphadrive Engineering Services Limited | Manufacturing | 2010 |
| Alphagen Capital Limited | Extraterritorial | 1969 |
| Alphajet Property Ventures Limited | Real estate | 2025 |
| Alphajet Ventures Limited | Financial services | 2023 |
| Alphamind Solutions Ltd | Information & communication | 2016 |
| Alphamoodz Ltd | Wholesale & retail | 2026 |
| Alphasat Communication Holding Limited | Administrative & support | 2011 |
| Alphascaling Ltd | Information & communication | 2026 |
| Alphatalk Limited | Information & communication | 2003 |
| Alphatalk Telecom Ltd | Information & communication | 2024 |
| Alphatax Ltd | Professional & scientific | 2026 |
| Alphaways International Limited | Wholesale & retail | 2025 |
| Alphawholesalers Limited | Wholesale & retail | 2021 |
| Alphena Tech Ltd | Wholesale & retail | 2019 |