| ALI Motors Luton Ltd | Wholesale & retail | 2016 |
| ALI Nawab Limited | Other services | 2018 |
| Alibaba Prefumes Ltd | Manufacturing | 2026 |
| Alice&Betty Ltd | Health & social care | 2021 |
| Alif Group of Companies Ltd | Wholesale & retail | 2024 |
| Align Design and Architecture Limited | Professional & scientific | 2004 |
| Alim Plumbing and Heating Ltd | Construction | 2017 |
| Alion Shisha Lounge Ltd | Hospitality | 2025 |
| Alisha's Aesthetics Ltd | Health & social care | 2016 |
| Alisons Land Investments Limited | Professional & scientific | 2004 |
| Alistair Homes Ltd | Construction | 2019 |
| Alita Star Events Ltd | Professional & scientific | 2023 |
| Alive Investments Group LLP | | 2026 |
| Alixor Limited | Wholesale & retail | 2020 |
| Aliyas Plastering Ltd | Construction | 2024 |
| Aliz World Ltd | Wholesale & retail | 2021 |
| Aliza Business Solutions Ltd | Professional & scientific | 2021 |
| Aljc Limited | Construction | 2020 |
| Alkad Solutions Ltd | Information & communication | 2020 |
| Alkas Financial Ltd | Administrative & support | 2016 |
| Alkemists Elixirs Ltd | Manufacturing | 2024 |
| ALL 4 Care Services Limited | Administrative & support | 2022 |
| ALL Building Certs Limited | Administrative & support | 2025 |
| ALL Cars Buyer Ltd | Wholesale & retail | 2023 |
| ALL Change Limited | Information & communication | 2016 |
| ALL Counties Home Improvements Ltd | Construction | 2016 |
| ALL Cover Services Limited | Administrative & support | 2019 |
| ALL Current Electrical Limited | Construction | 2021 |
| ALL for Training & Consultancy Services Limited | Other services | 2019 |
| ALL in One Property Support Ltd | Construction | 2026 |
| ALL LED Estates Limited | Real estate | 2020 |
| ALL LED Limited | Manufacturing | 2014 |
| ALL Levels Facilities and Build Ltd | Construction | 2024 |
| ALL Maintenance Ltd | Administrative & support | 2021 |
| ALL Mediums Ltd | Professional & scientific | 2026 |
| ALL Natural Pet Limited | Wholesale & retail | 2019 |
| ALL Occident Ltd | Construction | 2019 |
| ALL Seasons Repair & Alterations Ltd | Manufacturing | 2023 |
| ALL Skin Bright and Beautiful Ltd | Health & social care | 2018 |
| ALL Staff Recruitment Solutions Limited | Professional & scientific | 2006 |
| ALL Stainless Limited | Wholesale & retail | 1992 |
| ALL Star Resources Ltd | Construction | 2024 |
| ALL Stock Must Go Limited | Wholesale & retail | 2024 |
| ALL Tools UP Ltd | Construction | 2017 |
| ALL Wired UP Ltd | Information & communication | 2003 |
| ALL Word Delivery Limited | Transport & logistics | 2025 |
| ALL YOU Find Home Ltd | Wholesale & retail | 2025 |
| All-In-One Bargain Shop Limited | Manufacturing | 2025 |
| Alladin & Sons Ltd | Transport & logistics | 2013 |
| Allagraf Limited | Wholesale & retail | 2000 |
| Allan & Sons Renovations Limited | Construction | 2023 |
| Allbolly Ltd | Wholesale & retail | 2015 |
| Allc Services Ltd | Administrative & support | 2026 |
| Allcargo Express Ltd | Transport & logistics | 2009 |
| Allcheapestflights Limited | Administrative & support | 2017 |
| Allen VA Limited | Professional & scientific | 2023 |
| Allendale Construction Ltd | Construction | 2013 |
| Alley Barber Grooming Ltd | Other services | 2021 |
| Allfloors (Berkhamsted) Limited | Wholesale & retail | 2008 |
| Allhands Care Ltd | Health & social care | 2016 |
| Alliance CAD Services Ltd | Professional & scientific | 2026 |
| Alliance Garments Limited | Wholesale & retail | 2020 |
| Alliance Resolve Ltd | Construction | 2021 |
| Alliance Staffing & Security Limited | Financial services | 2025 |
| Allinone Builders (UK) Ltd | Construction | 2012 |
| Alliouguana Limited | Health & social care | 2002 |
| Allmarkets.Store Ltd | Wholesale & retail | 2023 |
| Allparcels Ltd | Transport & logistics | 2017 |
| Allstaff (Bedford) Limited | Administrative & support | 2009 |
| Allure Accountancy Limited | Professional & scientific | 2025 |
| Allure MTD Limited | Professional & scientific | 2024 |
| Allure X Trader Limited | Wholesale & retail | 2025 |
| Allways Imports Ltd | Wholesale & retail | 2025 |
| ALM Building Services & Property Maintenance Ltd | Construction | 2025 |
| Alma Oshin Ltd Ltd | Real estate | 2022 |
| Almadina Event Management Ltd | Administrative & support | 2025 |
| Almadinah Abaya Ltd | Wholesale & retail | 2023 |
| Almar Luton Ltd | Hospitality | 2024 |
| Almass Bikes Ltd | Wholesale & retail | 2015 |
| Almass Properties Limited | Real estate | 2021 |
| Almeca Flats Management Limited | Households | 2002 |
| Almighty Handyman Ltd | Manufacturing | 2025 |
| Alnoor Properties (Luton) Limited | Real estate | 2025 |
| Alnto Construction Ltd | Construction | 2026 |
| Aloud Trading Limited | Hospitality | 2026 |
| ALP Projects Ltd | Construction | 2022 |
| Alpha Amega Care Ltd | Health & social care | 2016 |
| Alpha B Consult Limited | Transport & logistics | 2024 |
| Alpha Banads Limited | Wholesale & retail | 2020 |
| Alpha Boiler Plumbing and Home Improvement Ltd | Construction | 2020 |
| Alpha Bricks Investments Ltd | Real estate | 2026 |
| Alpha Bricks Properties Ltd | Real estate | 2023 |
| Alpha Commercial Group Ltd | Real estate | 2026 |
| Alpha Debt Collection Services Limited | Administrative & support | 1974 |
| Alpha Driving Solutions Limited | Education | 2024 |
| Alpha Executive Limited | Transport & logistics | 2015 |
| Alpha Financial Services Group Ltd | Professional & scientific | 2026 |
| Alpha Forge UK Limited | Manufacturing | 2025 |
| Alpha Halal Food Limited | Hospitality | 2024 |
| Alpha Hire Solutions Ltd | Administrative & support | 2012 |