| AMY Garth Ltd | Wholesale & retail | 2023 |
| AMY Lopez Hair Ltd | Other services | 2023 |
| Amy's Nest Cleaning Service Limited | Administrative & support | 2025 |
| Amzs Global Limited | Wholesale & retail | 2025 |
| AN Green and Fresh Cleaning Limited | Administrative & support | 2023 |
| AN NUR Ltd | Wholesale & retail | 2017 |
| AN PVT. Limited | Health & social care | 2019 |
| AN VAT Ltd | Construction | 2024 |
| An&Aim Ltd | Information & communication | 2024 |
| ANA Leeds Ltd | Administrative & support | 2020 |
| Anad Group Limited | Transport & logistics | 2019 |
| Anador Caffea Ltd | Hospitality | 2026 |
| Anadorfra Cleaning Ltd | Administrative & support | 2022 |
| Anaesthesia Technology Limited | Manufacturing | 1992 |
| Anaikar Ltd | Health & social care | 2019 |
| Anais and Limited | Manufacturing | 2025 |
| Analogue Creative Limited | Professional & scientific | 2007 |
| Analyse-It Software Limited | Information & communication | 1995 |
| Analysis Trustees Limited | Financial services | 1985 |
| Anam Ayurveda Holistic Health Limited | Health & social care | 2008 |
| Anam Qureshi Consulting Ltd | Information & communication | 2026 |
| Anand Estate Ltd | Real estate | 2021 |
| Anand Foods Limited | Manufacturing | 2015 |
| Anand Property Group Ltd | Real estate | 2020 |
| Anand Surgical Services Ltd | Health & social care | 2018 |
| Ananya Garms Limited | Wholesale & retail | 2020 |
| Anar Care PVT. Ltd | Health & social care | 2023 |
| Anas 12 Ltd | Other services | 2025 |
| Anatre Limited | Professional & scientific | 2020 |
| Anatree Group Logistics Ltd. | Professional & scientific | 2019 |
| Anayah & Imaan Limited | Health & social care | 2020 |
| ANC Computers Limited | Manufacturing | 2025 |
| ANC (Yorkshire) Limited | Construction | 2018 |
| Anca Cleaner 2 Limited | Administrative & support | 2024 |
| Ancamain Limited | Real estate | 1986 |
| Ancd Healthcare Ltd | Health & social care | 2014 |
| Ancholme Building Services Limited | Construction | 2015 |
| Anchor & Oaks Ltd | Administrative & support | 2025 |
| Anchor Bay Holidays Limited | Hospitality | 2021 |
| Anchor Industries Limited | | 2011 |
| Anchor Law Ltd | Professional & scientific | 2026 |
| Anchor Point Services Limited | Administrative & support | 2025 |
| Anchor Properties Investments Ltd | Financial services | 2022 |
| Anchor Property Solutions Limited | Real estate | 2016 |
| Anchor Staffing Solutions Limited | Administrative & support | 2025 |
| Anchor Wholesale Ltd | Wholesale & retail | 2020 |
| Anchorbee Ltd | Information & communication | 2024 |
| Anchorlock Ltd | Professional & scientific | 2024 |
| Anchris Ltd | Professional & scientific | 2017 |
| Anco Engineering Limited | Manufacturing | 2011 |
| AND Consulting Ltd | Information & communication | 2021 |
| AND Education Ltd | Education | 2022 |
| AND Houses Ltd | Real estate | 2018 |
| AND Then Consulting Limited | Information & communication | 2024 |
| Anda Film Limited | Information & communication | 2010 |
| Andago Ltd | Construction | 2015 |
| Andalus AL Ltd | Arts & recreation | 2023 |
| Andaz Limited | Real estate | 2000 |
| Andeb Healthcare Ltd | Professional & scientific | 2013 |
| Andellie Ltd | Financial services | 2020 |
| Anderson & Partners | | 2005 |
| Anderson 5030 Limited | Information & communication | 2006 |
| Anderson Advertising and Property Marketing Limited | Professional & scientific | 2010 |
| Anderson ATV Limited | Manufacturing | 2004 |
| Anderson House Developments Ltd | Real estate | 2017 |
| Anderson Surrounds Limited | | 1970 |
| Anderton Hall Limited | Professional & scientific | 2009 |
| Andes Pictures Limited | Information & communication | 2020 |
| Andes Recruitment Ltd | Administrative & support | 2026 |
| Andfields Accountancy Recruitment and Consultancy Limited | Professional & scientific | 2025 |
| Andi Associates Ltd | Construction | 2024 |
| Andiamo! Language Services Limited | Professional & scientific | 2000 |
| Andiamo! Limited | Professional & scientific | 2005 |
| Andiamo! MJS (Holdings) UK Limited | Other services | 2021 |
| Andlily Care Ltd | Public administration | 2022 |
| Andrarose Limited | Wholesale & retail | 2013 |
| Andrea Cleaning Limited | Construction | 2022 |
| Andrea's Hairoom Limited | Health & social care | 2013 |
| Andree Cleaning Limited | Construction | 2026 |
| Andrei P Limited | Transport & logistics | 2018 |
| Andrew Boon & Associates Limited | Health & social care | 2009 |
| Andrew Business Ltd | Transport & logistics | 2015 |
| Andrew Corrie Construction Limited | Construction | 2022 |
| Andrew Daniel Limited | Extraterritorial | 2013 |
| Andrew EB Ltd | Other services | 2018 |
| Andrew Garbutt Mobile Plant Electrical and Diagnostic Services Ltd. | Manufacturing | 2015 |
| Andrew Harley European Limited | Transport & logistics | 2015 |
| Andrew Hibbitt (Civils QS) Limited | Construction | 2007 |
| Andrew Hull Engineering Limited | Professional & scientific | 2016 |
| Andrew James Bespoke Limited | Extraterritorial | 2013 |
| Andrew Jubb Ltd | Professional & scientific | 2023 |
| Andrew Legg Limited | Health & social care | 2023 |
| Andrew Lumley Fine Antique Arms & Armour Limited | Wholesale & retail | 2014 |
| Andrew Lumley Holdings Limited | Extraterritorial | 2010 |
| Andrew Lumley Limited | Wholesale & retail | 2017 |
| Andrew Mellish Property Home Services Limited | Construction | 2006 |
| Andrew Moseley Associates Limited | Construction | 2017 |
| Andrew Parkinson Ltd | Transport & logistics | 2018 |
| Andrew Southey Architect Limited | Professional & scientific | 2020 |
| Andrew Spence (Building Contractor) Ltd | Construction | 2008 |