| Alta Solutions Limited | Professional & scientific | 2013 |
| Alternative Game Limited | Hospitality | 2010 |
| Altram House Property Ltd | Real estate | 2024 |
| Alvaton Ltd | Transport & logistics | 2020 |
| Always Waggy Tails Ltd | Agriculture & fishing | 2024 |
| AM Auto Electrician Ltd | Wholesale & retail | 2022 |
| AM TBT Transport Ltd | Transport & logistics | 2025 |
| Amarcip Trans Ltd | Transport & logistics | 2014 |
| Amaroni Group Limited | Wholesale & retail | 2022 |
| Amazon Locum Limited | Professional & scientific | 2019 |
| Amber Enterprises (Specialist Services) Limited | Information & communication | 1990 |
| Amberley Adhesive Labels Limited | Manufacturing | 2002 |
| Ambrose Flowers Limited | Wholesale & retail | 2003 |
| AMI Trans Ltd | Transport & logistics | 2017 |
| Amici Restaurants Limited | Hospitality | 2006 |
| AMJ Brickwork Contractors Ltd | Construction | 2020 |
| AML Instruments Ltd | Manufacturing | 2012 |
| AML Investments Ltd | Real estate | 2017 |
| AML Roofing Ltd | Construction | 2025 |
| Ammsuk Ltd | Health & social care | 2015 |
| AMS Plant and Machinery Sales Limited | Wholesale & retail | 2025 |
| AMS Spalding (2025) Ltd | Professional & scientific | 2026 |
| AMS Spalding 2026 Ltd | Professional & scientific | 2026 |
| Amsit Investments Ltd | Financial services | 2023 |
| AMT93 Limited | Transport & logistics | 2025 |
| Amvs Trans Ltd | Transport & logistics | 2025 |
| ANA Barna Ltd | Professional & scientific | 2019 |
| Anarore Limited | Financial services | 2022 |
| Anchor Inn (Sutton Bridge) Ltd | Hospitality | 2024 |
| Anchor Lodge Limited | Hospitality | 2017 |
| Anchored Homes Ltd | Real estate | 2026 |
| Ancy Transport Ltd | Wholesale & retail | 2019 |
| Andeco Ltd | Construction | 2015 |
| Andomar Ltd | Transport & logistics | 2026 |
| Andra Salon Ltd | Other services | 2024 |
| Andras Trans Limited | Transport & logistics | 2016 |
| Andreea Elena Trans Ltd | Transport & logistics | 2015 |
| Andreeabcleaning Limited | Administrative & support | 2024 |
| Andrew & Co (Spalding) Limited | Wholesale & retail | 1957 |
| Andrew Hicks Ltd | Construction | 2015 |
| Andrew Hooker Plumbing & Heating Ltd | Construction | 2015 |
| Andrew M Wright Ltd | Professional & scientific | 2015 |
| Andrew Trans (Lincs) Ltd | Transport & logistics | 2024 |
| ANDREW1972INT Ltd | Information & communication | 2023 |
| Andy Cargo Trans Ltd | Transport & logistics | 2020 |
| Andy Carroll Promotions Limited | Other services | 2011 |
| Andy Granite Ltd | Administrative & support | 2026 |
| Andy Green Capital Limited | Financial services | 2025 |
| Andy Lefeuvre Electrical Engineering Ltd | Construction | 2022 |
| Anecoop UK Limited | Wholesale & retail | 1996 |
| Angle Transport Ltd | Transport & logistics | 2025 |
| Angled Experiences Limited | Other services | 2025 |
| Anglia (UK) Holdings Limited | Professional & scientific | 2009 |
| Anglia (UK) Limited | Financial services | 1998 |
| Anglia (UK) Self Store Ltd | Administrative & support | 2024 |
| Anglia Audit Services Limited | Professional & scientific | 2013 |
| Anglia Care Associates Ltd | Health & social care | 2013 |
| Anglia Collections and Recovery Limited | Financial services | 2005 |
| Anglia Credit Management Limited | Other services | 2005 |
| Anglia Fleet Services Limited | Wholesale & retail | 2011 |
| Anglia Paving Solutions Limited | Construction | 2021 |
| Anglia Property Rentals Limited | Real estate | 2021 |
| Anglia Recovery Limited | Transport & logistics | 2025 |
| Anglia Salads Limited | Agriculture & fishing | 2001 |
| Anglia Vehicle Logistics Limited | Transport & logistics | 2021 |
| Anglia Vehicle Recovery Limited | Transport & logistics | 1999 |
| Anglo Plant Limited | Administrative & support | 1996 |
| Ania Cares Ltd | Health & social care | 2020 |
| Animoo Art Ltd | Arts & recreation | 2021 |
| Anms Trans Ltd | Transport & logistics | 2014 |
| Anna Geodetics Ltd | Professional & scientific | 2023 |
| Anneka's Angels Ltd | Health & social care | 2025 |
| Anneka's Baby Bootcamp Ltd | Health & social care | 2025 |
| Annie's Hardware & DIY Limited | Wholesale & retail | 2024 |
| Anpe Ltd | Transport & logistics | 2018 |
| Anple Love Ltd | Hospitality | 2025 |
| Antanas&Transport Limited | Transport & logistics | 2017 |
| Anthony Frazer Group Limited | Administrative & support | 2017 |
| Anton Transport Ltd | Transport & logistics | 2021 |
| Antonio Mario Ltd | Transport & logistics | 2019 |
| Antonios Medical Services Limited | Health & social care | 2010 |
| Ants&M Ltd | Wholesale & retail | 2024 |
| AP London Business Services Ltd | Professional & scientific | 2019 |
| AP Transport Express Ltd | Transport & logistics | 2015 |
| Apex Solar PV Ltd | Construction | 2023 |
| Apex Vehicle Repair Ltd | Wholesale & retail | 2010 |
| Apexplumbinguk Limited | Construction | 2023 |
| APG Carpets and Flooring Limited | Construction | 2024 |
| APG Produce Limited | Wholesale & retail | 2018 |
| APJ Electrical Limited | Construction | 2021 |
| APK Group Ltd | Construction | 2020 |
| APM Transport Ltd | Transport & logistics | 2022 |
| APN Logistics Ltd | Transport & logistics | 2016 |
| Apollo Photos Limited | Professional & scientific | 2025 |
| Apple Tree Group Limited | Manufacturing | 2021 |
| Applegate Group Limited | Financial services | 2013 |
| Applegate Homes (Lincs) Limited | Construction | 2012 |
| Applegate Limited | Extraterritorial | 2013 |
| Applegate UK Limited | Real estate | 2008 |
| APS Bathrooms Limited | Construction | 2023 |