| Alfie Barnes Consulting Limited | Professional & scientific | 2023 |
| Alfie In-The-Air Ltd | Wholesale & retail | 2020 |
| Alfordson International Trade Ltd | Wholesale & retail | 2025 |
| Alfred Trans Ltd | Wholesale & retail | 2019 |
| Alfred's Fruit and VEG Ltd | Wholesale & retail | 2024 |
| Alfredo Alberto Fiore Enterprise Ltd | Transport & logistics | 2013 |
| ALG Transport Limited | Transport & logistics | 2023 |
| Algarve Composites Limited | Manufacturing | 2016 |
| Algarve Granite Limited | Manufacturing | 2004 |
| Algorand Operations (UK) Ltd | Financial services | 2024 |
| ALI Abbas Trading Ltd | Wholesale & retail | 2025 |
| ALI Northampton Ltd | Real estate | 2024 |
| Alia Trans Ltd | Transport & logistics | 2019 |
| Alice Energy Solutions Limited | Construction | 2025 |
| Alice Fender Hair Education Limited | Education | 2024 |
| Alice Fender Hair Limited | Other services | 2024 |
| Alici Limited | Other services | 2015 |
| Alicuno Ltd | Hospitality | 2020 |
| Alido Civil Engineering & Infrastructure Consultants Ltd | Professional & scientific | 2018 |
| Align Landscape Planning Ltd | Professional & scientific | 2025 |
| Aligned and Wealthy Limited | Education | 2018 |
| Alim Food Centre Ltd | Wholesale & retail | 2021 |
| Alim Food Ltd | Wholesale & retail | 2023 |
| Alimam Ltd | Construction | 2023 |
| Alina Munteanu Advisory Ltd | Professional & scientific | 2026 |
| Alina Nail Room Ltd | Wholesale & retail | 2021 |
| Alina Nails SRB Ltd | Other services | 2023 |
| Alinom Properties Ltd | Real estate | 2025 |
| Alis Car Sale Ltd | Wholesale & retail | 2026 |
| Alis Transporter Limited | Transport & logistics | 2022 |
| Aliscom Ltd | Construction | 2021 |
| Alison Hayes (UK) Limited | Manufacturing | 1988 |
| Alisons Properties UK Ltd | Real estate | 2026 |
| Alive Health Care & Support Services Ltd | Health & social care | 2026 |
| Alive Health Care Intl Ltd | Health & social care | 2021 |
| Aliya's Dreams Ltd | Real estate | 2020 |
| ALL About Recruitment Ltd | Administrative & support | 2019 |
| ALL About the Benjamins Ltd | Arts & recreation | 2020 |
| ALL Aspects D&S Limited | Real estate | 2024 |
| ALL Aspects Recycling Ltd | Water & waste | 2021 |
| ALL Hours Pubs Limited | Hospitality | 2025 |
| ALL in One House Ltd | Wholesale & retail | 2024 |
| ALL Incompass Limited | Education | 2024 |
| ALL Levels Access Services Limited | Manufacturing | 2017 |
| ALL Levels Limited | Manufacturing | 2022 |
| ALL Power Products Limited | Administrative & support | 2002 |
| ALL Saints Bistro Ltd | Hospitality | 2021 |
| ALL Saints Financial LLP | | 2015 |
| ALL Saints Mechanical Ltd | Construction | 2021 |
| ALL Seasons Cafe Limited | Hospitality | 2010 |
| ALL Star LED Limited | Wholesale & retail | 2024 |
| ALL Task Logistic Ltd | Transport & logistics | 2013 |
| ALL the Best Deals UK Limited | Wholesale & retail | 2024 |
| ALL Things Code Limited | Extraterritorial | 2017 |
| ALL Things Data & Systems Ltd | Information & communication | 2021 |
| ALL Things Garden Buildings Ltd | Construction | 2021 |
| ALL Things Management Limited | Information & communication | 2015 |
| ALL Trades Npton Ltd | Construction | 2020 |
| ALL U Building Ltd | Construction | 2025 |
| All-Round Business Ltd | Administrative & support | 2005 |
| All-Wise Consult Ltd | Administrative & support | 2015 |
| Allan Diamond Rose Property Development Ltd | Real estate | 2024 |
| Allan Investment Management Limited | Financial services | 2005 |
| Allan Lamb Associates Limited | Administrative & support | 1996 |
| Allelia Ltd | Professional & scientific | 2026 |
| Allen & Jane Roofing Contractors Limited | Construction | 2003 |
| Allen Drylining Ltd | Construction | 2015 |
| Allen Sparkly Cleans Ltd | Administrative & support | 2020 |
| Allenvironmental Training & Consultancy Ltd | Education | 2018 |
| Allgold Investments Limited | Administrative & support | 2014 |
| Alliance & Leicester Investments (NO.2) Limited | Extraterritorial | 1988 |
| Alliance Drywall Ltd | Construction | 2020 |
| Alliance Financial Consultancy Limited | Financial services | 2019 |
| Alliance Lofts Limited | Construction | 2025 |
| Alliance Risk Investments Ltd | Financial services | 2016 |
| Allied Landscapes Limited | Administrative & support | 2002 |
| Allin Paint Ltd | Wholesale & retail | 2024 |
| Allington Limited | Real estate | 2021 |
| Allison Printers Limited | Manufacturing | 2014 |
| Allison Property Limited | Real estate | 2016 |
| Alliston Gardens Youth & Community Centre | Arts & recreation | 2011 |
| Allium Projects Ltd | Information & communication | 2020 |
| Allom Architectural Lighting Ltd | Manufacturing | 2016 |
| Allseasons Gardening & Logs Limited | Administrative & support | 2009 |
| Allseasons Property Services Ltd | Construction | 2022 |
| Allsopp@Birmingham Limited | Health & social care | 2025 |
| Allsopp@Birmingham Road Limited | Health & social care | 2012 |
| Allstone Tiling Limited | Construction | 2019 |
| Alltorc Innovations Limited | Professional & scientific | 2026 |
| Alltrade Post Limited | Transport & logistics | 2005 |
| Allure Acquisitions Ltd | Wholesale & retail | 2023 |
| Allure Property Lets Ltd | Hospitality | 2025 |
| Allwork Orthopaedics Ltd | Professional & scientific | 2021 |
| ALM Network Ltd | Transport & logistics | 2026 |
| ALM Property Services Limited | Extraterritorial | 2008 |
| ALM Surveying Limited | Extraterritorial | 2008 |
| Alma MD Limited | Construction | 2020 |
| Almaandco Ltd | Wholesale & retail | 2024 |
| Almach Leadership Ltd | Administrative & support | 2017 |
| Almasara Ltd | Transport & logistics | 2019 |