| Aliyildirim Ltd | Wholesale & retail | 2023 |
| Alizadecommerce Ltd | Wholesale & retail | 2025 |
| Alizah Khan Ltd | Transport & logistics | 2019 |
| Alization Group Ltd | Wholesale & retail | 2025 |
| ALJ Couriers Ltd | Transport & logistics | 2020 |
| Aljaa Sports Ltd | Wholesale & retail | 2025 |
| ALK Developments Ltd | Real estate | 2025 |
| Alka Holdco Limited | Financial services | 2025 |
| Alkar Global Trade Ltd | Wholesale & retail | 2023 |
| Alkhashab for Trading Ltd | Wholesale & retail | 2025 |
| Alkidra Group UK Ltd | Wholesale & retail | 2017 |
| Alkirky Services Limited | Professional & scientific | 2025 |
| Alkohl Ltd | Manufacturing | 2019 |
| ALL 5 Star Limited | Information & communication | 2017 |
| ALL About Electric Services Limited | Construction | 2019 |
| ALL Around Islam Ltd | Wholesale & retail | 2025 |
| ALL Aspects CDF Ltd | Construction | 2022 |
| ALL Aspects Pools Limited | Other services | 2015 |
| ALL Aspects Telecoms Ltd | Construction | 2025 |
| ALL Claims Management Limited | Other services | 2009 |
| ALL Class Solutions Ltd | Administrative & support | 2019 |
| ALL Clean Industrial Cleaning Services Limited | Other services | 2001 |
| ALL Cleaned UP Limited | Other services | 2012 |
| ALL Construction Contractors Ltd | Construction | 2019 |
| ALL Day Cruise Limited | Administrative & support | 2017 |
| ALL Digital Limited | Information & communication | 2004 |
| ALL Electrical Limited | Manufacturing | 2001 |
| ALL Fire Protection Limited | Professional & scientific | 2022 |
| ALL Green Installations Ltd | Construction | 2020 |
| ALL Home FIX Limited | Construction | 2018 |
| ALL in Good Company Experiences Ltd | Professional & scientific | 2026 |
| ALL in One Diamond Ltd | Wholesale & retail | 2023 |
| ALL in One Healthcare and Support Ltd | Administrative & support | 2019 |
| ALL in One Online Store Ltd | Wholesale & retail | 2023 |
| ALL in One Roofing Specialists Ltd | Construction | 2019 |
| ALL in Stock Limited | Wholesale & retail | 2020 |
| ALL in Time Limited | Wholesale & retail | 2018 |
| ALL in Trading Limited | Wholesale & retail | 2017 |
| ALL Jobs Ltd | Construction | 2019 |
| ALL Khan INT Ltd | Administrative & support | 2020 |
| ALL One Service Limited | Administrative & support | 2012 |
| ALL Pixel IT Ltd | Information & communication | 2025 |
| ALL Repairs Martin Ltd | Construction | 2017 |
| ALL Saints Brewing Company Ltd | Manufacturing | 2022 |
| ALL Seasons (Grounds Contractors) Limited | Administrative & support | 2015 |
| ALL Seasons Clothing Ltd | Wholesale & retail | 2025 |
| ALL Seasons Trees and Garden Services Ltd | Administrative & support | 2026 |
| ALL Soft Keys Ltd | Wholesale & retail | 2024 |
| ALL Squares Sports CIC | Arts & recreation | 2014 |
| ALL Star Car Valet Ltd | Wholesale & retail | 2024 |
| ALL Star Car Wash Limited | Wholesale & retail | 2019 |
| ALL Star Car Wash SW Ltd | Wholesale & retail | 2024 |
| ALL Star Plumbing & Heating Ltd | Construction | 2018 |
| ALL Swim Limited | Wholesale & retail | 1972 |
| ALL Terrain Tyres Limited | Wholesale & retail | 2004 |
| ALL the Ways Entertainment Ltd | Information & communication | 2025 |
| ALL Things Africa CIC | Education | 2026 |
| ALL Tiles Ltd | Wholesale & retail | 2023 |
| ALL Time Recruitment Ltd | Wholesale & retail | 2021 |
| ALL Torque Sales Training Limited | Professional & scientific | 2018 |
| ALL Type Roofing Specialists Limited | Construction | 2026 |
| ALL Types Motor Factors Limited | Wholesale & retail | 2011 |
| ALL Types of Journeys Ltd | Wholesale & retail | 2025 |
| ALL Vehicles Sales Limited | Wholesale & retail | 2002 |
| ALL Wales People First | Other services | 2009 |
| ALL Weather Roofing Cardiff UK Ltd | Construction | 2026 |
| ALL Writing Pro Ltd | Information & communication | 2025 |
| All-Peace Ltd | Wholesale & retail | 2021 |
| ALL4EBIKES Ltd | Wholesale & retail | 2026 |
| Allada Development Corporation Ltd | Financial services | 2025 |
| Allamani Tiling & Building Ltd | Construction | 2022 |
| Allan Porter Transport Limited | Transport & logistics | 2014 |
| Allbarex Limited | Hospitality | 2025 |
| Allburnt Ltd | Hospitality | 2025 |
| Allcounties Ltd | Transport & logistics | 2008 |
| Alleeuro Ltd | Wholesale & retail | 2018 |
| Allegra Dental Ltd | Health & social care | 2014 |
| Allegra Property Investments Ltd | Real estate | 2021 |
| Allegro European Limited | Transport & logistics | 2018 |
| Allen & Sage Roofing/Building Ltd | Construction | 2021 |
| Allen & Sons Renovations Ltd | Administrative & support | 2020 |
| Allen Allcare Limited | Wholesale & retail | 2024 |
| Allen Factory Limited | Real estate | 2022 |
| Allen-Bradley Electronics Limited | | 1948 |
| Allergology and GP Clinic DR Tomasz Grzelewski Limited | Health & social care | 2023 |
| Allergy Wales Ltd | Extraterritorial | 2021 |
| Allerton Civil Engineering Ltd | Construction | 2026 |
| Allerton Grant Limited | Real estate | 2017 |
| Alleveda Group Limited | Health & social care | 2024 |
| Allfind Limited | Other services | 2021 |
| Allgate Turn Key Solutions Limited | Financial services | 2023 |
| Alliance Clinicals Ltd | Health & social care | 2016 |
| Alliance Euroland Investment Limited | Real estate | 1999 |
| Alliance House Properties Limited | Real estate | 2013 |
| Alliance Powder Coatings Limited | Administrative & support | 2009 |
| Alliance Property Limited | Real estate | 2019 |
| Alliance Travel Ltd | Wholesale & retail | 2023 |
| Alliances (BMC) Limited | Information & communication | 2024 |
| Allianz Investments Ltd | Real estate | 2025 |
| Allied Assetz Management Limited | Real estate | 2019 |