| Alora's Productions Ltd | Information & communication | 2026 |
| Alpha Access Services Limited | Real estate | 2025 |
| Alpha Cladding & Roof Maintenance Ltd | Construction | 2018 |
| Alpha Facilities Services Limited | Construction | 2022 |
| Alpha Lift Contract Lifting Limited | Professional & scientific | 2018 |
| Alpha Rentals NE Ltd | Administrative & support | 2025 |
| Alpha Technology Systems Limited | Information & communication | 1999 |
| Alpha Windmill (Bedale) Limited | Health & social care | 2015 |
| Alpha Windmill (York) Limited | Health & social care | 2015 |
| Alpha-C Engineering Ltd | Construction | 2023 |
| Alphalink Streams Limited | Wholesale & retail | 2021 |
| Alphapack Travel Limited | Administrative & support | 2016 |
| Alphasearch (UK) Limited | Professional & scientific | 2002 |
| Alphatech IT Solutions Ltd | Information & communication | 2022 |
| Alsaeid UK Ltd | Wholesale & retail | 2025 |
| ALT Labs Agency Limited | Information & communication | 2017 |
| ALT Property Lets Ltd | Real estate | 2024 |
| Altaix Performance Ltd | Manufacturing | 2025 |
| Altrac Living Limited | Manufacturing | 2020 |
| Alu-Fix Limited | Manufacturing | 2004 |
| Alura Skin Clinic Ltd | Other services | 2024 |
| Alva Electrics Ltd | Construction | 2025 |
| Alytra Ltd. | Professional & scientific | 2023 |
| Alza Limited | Real estate | 2018 |
| AM Accountants & Tax Advisors Ltd | Professional & scientific | 2023 |
| AM and CM Reed Properties Ltd | Construction | 2020 |
| AM Bartley Logistics Ltd | Transport & logistics | 2025 |
| AM Electro Solutions Limited | Professional & scientific | 2025 |
| AM Lifting Services Ltd | Construction | 2025 |
| AM Northeast HSE Ltd | Construction | 2025 |
| AM Projects (North East) Limited | Professional & scientific | 2018 |
| AM Therapies Ltd | Health & social care | 2024 |
| AM21 Ltd | Wholesale & retail | 2021 |
| AM26 Ltd | Wholesale & retail | 2026 |
| Amaglobal Foods Limited | Wholesale & retail | 2022 |
| Amaglobal Hair and Beauty Limited | Wholesale & retail | 2026 |
| Amaglobal Housing Ltd | Real estate | 2023 |
| Amani Consultancy Ltd | Professional & scientific | 2025 |
| Amante Properties Limited | Real estate | 2018 |
| Amazik Ltd | Wholesale & retail | 2026 |
| Ambellot Limited | Wholesale & retail | 2018 |
| Amber Care Group (UK) Ltd | Health & social care | 2021 |
| Amber Coast Properties Limited | Real estate | 2024 |
| Ambhikanadha Limited | Hospitality | 2025 |
| Ambleside Builds Ltd | Construction | 2026 |
| Ambrose & Co Accounting Solutions Ltd | Professional & scientific | 2019 |
| Ambrose Offshore Management Services Ltd | Construction | 2014 |
| AMC Safety Limited | Health & social care | 2013 |
| Amcore Limited | Manufacturing | 2024 |
| Amcs Consultants Ltd | Construction | 2019 |
| AMD Delivery Ltd | Transport & logistics | 2019 |
| Amelia Jasmin Ltd | Financial services | 2023 |
| Ameliyana Boutique Ltd | Wholesale & retail | 2020 |
| Ameliyana Origins Limited | Wholesale & retail | 2022 |
| Amer Ditta Consultancy Limited | Administrative & support | 2019 |
| AMG Design and Print Ltd | Other services | 2017 |
| AMG Retail Ltd | Wholesale & retail | 2026 |
| Amigos Pizzeria Limited | Hospitality | 2019 |
| Amir Bashir Ltd | Wholesale & retail | 2024 |
| Amira Sehr 1 Ltd | Wholesale & retail | 2026 |
| Amira Sehr Ltd | Wholesale & retail | 2024 |
| Amiz Autos Ltd | Extraterritorial | 2025 |
| Amjbh Enterprises Ltd | Wholesale & retail | 2023 |
| Amlh Professional Services Ltd | Professional & scientific | 2022 |
| Amlk Electrical Limited | Construction | 2018 |
| AMM (NE) Limited | Construction | 2017 |
| Ammonic Ltd | Professional & scientific | 2021 |
| AMN Consultancy Ltd | Professional & scientific | 2023 |
| AMP Global Engineering Limited | Construction | 2025 |
| Amprotech Limited | Professional & scientific | 2005 |
| AMR Autos Great Ayton Ltd | Wholesale & retail | 2012 |
| Amreen Ayub Limited | Public administration | 2022 |
| Amris Entertainment Ltd | Professional & scientific | 2024 |
| AMS Mechanical Fitting Services Limited Limited | Manufacturing | 2017 |
| Amsa Holdings Limited | Financial services | 2021 |
| AMY Crosby Consultancy Ltd | Health & social care | 2026 |
| AMY Pounder Personal Training Ltd | Arts & recreation | 2020 |
| AMY Simpson Fitness Ltd | Arts & recreation | 2017 |
| AMZ Digital Ltd | Wholesale & retail | 2024 |
| Amzo Teesside Ltd | Administrative & support | 2015 |
| AN Infant Hercules Ltd | Hospitality | 2025 |
| Analytics & Cloud Solutions Ltd | Information & communication | 2023 |
| Anaments Ltd | Real estate | 2020 |
| Ananda Wellbeing Ltd | Other services | 2018 |
| Anasyst Ltd | Manufacturing | 2013 |
| Andalussia Lubricant Limited | Wholesale & retail | 2021 |
| Andoe Ltd | Information & communication | 2025 |
| Andrea Round Clinical Coding Consultancy Limited | Information & communication | 2016 |
| Andrei Fiberglass Ltd | Construction | 2020 |
| Andrew Cleaning Ltd | Administrative & support | 2022 |
| Andrew Cross Osteopathic Clinic Ltd | Health & social care | 2010 |
| Andrew Hampton Logistics Limited | Transport & logistics | 2025 |
| Andrew Keen Electrical Services Ltd | Manufacturing | 2024 |
| Andrew Stamp of Stokesley Landscapes Ltd | Administrative & support | 2001 |
| Andrew Tose Ltd | Energy | 2018 |
| Andrew Trippett Ltd | Professional & scientific | 2026 |
| Andrew.Cuthbertsonengineering Ltd | Manufacturing | 2018 |
| Andrewhelm Limited | Professional & scientific | 2023 |
| Andromeda Developments Ltd | Real estate | 2021 |
| Andromeda Solutions Ltd | Information & communication | 2013 |