| 123 Medical Ltd | Professional & scientific | 2019 |
| 1ST Class Tutor Ltd | Education | 2023 |
| 247 Vapes Ltd | Wholesale & retail | 2022 |
| 2810 Properties Limited | Real estate | 2024 |
| 2D Freight Ltd | Transport & logistics | 2016 |
| 2J Investments LLP | | 2007 |
| 2LOVEMY Ltd | Wholesale & retail | 2024 |
| 365 PM Limited | Construction | 2023 |
| 3D FUN Printz Ltd | Manufacturing | 2025 |
| 3D Visuals Ltd | Professional & scientific | 2022 |
| 3DGN Ltd | Construction | 2023 |
| 42R Ltd | Information & communication | 2020 |
| 4E Cloud Consults Limited | Information & communication | 2017 |
| 4E Cloud Properties Limited | Real estate | 2025 |
| 4U Healthcare Group Ltd | Financial services | 2020 |
| 7PDS Accountancy Services Limited | Professional & scientific | 2015 |
| A & B IT Services Limited | Information & communication | 2017 |
| A & D Sales Limited | Wholesale & retail | 1999 |
| A Donnelly Properties Ltd | Real estate | 2025 |
| A J Ralph Cars Limited | Wholesale & retail | 2025 |
| A Rimmer Ltd | Transport & logistics | 2018 |
| A S Auto Parts Limited | Wholesale & retail | 2016 |
| A Thompson Limited | Other services | 2025 |
| A to B Removals Liverpool Ltd | Transport & logistics | 2019 |
| A&C D Couriers Ltd | Transport & logistics | 2025 |
| A&I Trailers Limited | Manufacturing | 2011 |
| A.G.P Services Ltd | Wholesale & retail | 2025 |
| A.J.M. Sheet Metal Fabricators & Precision Engineers Limited | | 1978 |
| A1 Adas Group Holdings Limited | Financial services | 2024 |
| A1 Adas Solutions Limited | Wholesale & retail | 2021 |
| A1 Coaches Ltd | Transport & logistics | 2014 |
| A1 Properties & Investments Limited | Real estate | 2018 |
| A1 Remote Diagnostics Ltd | Wholesale & retail | 2020 |
| AA Waste Solutions Ltd | Water & waste | 2023 |
| AAA Sports Memorabilia Limited | Other services | 2017 |
| Abbey Convenience Store Ltd | Wholesale & retail | 2024 |
| Abbeywood Construction Ltd | Construction | 2011 |
| Abbieview Limited | Real estate | 2022 |
| Abfb Limited | Extraterritorial | 2024 |
| Abjh Property Ltd | Real estate | 2025 |
| About the Town CIC | Professional & scientific | 2019 |
| Absolute Occupational Health Ltd | Health & social care | 2018 |
| Abtech Holdings Ltd | Information & communication | 2024 |
| Abtom Ltd | Professional & scientific | 2023 |
| AC Turbos Ltd | Wholesale & retail | 2020 |
| Access Fire and Security Engineering Services Ltd | Construction | 2021 |
| Accountancy 4 U Limited | Professional & scientific | 2004 |
| Accountants Near ME Limited | Professional & scientific | 2023 |
| Ace Adaptations Ltd | Financial services | 2023 |
| Ace Composites Limited | Manufacturing | 2014 |
| Acentus Real Estate Ltd | Real estate | 2017 |
| Acepak UK Limited | Manufacturing | 2017 |
| ACI Reports Ltd | Professional & scientific | 2009 |
| Acorn Painting & Decorating Ltd | Construction | 2012 |
| Acre Developments (NW) Limited | Construction | 2024 |
| Acregate Store Ltd | Wholesale & retail | 2023 |
| Action Factory Publishing Limited | Information & communication | 2020 |
| Action Pizza Limited | Hospitality | 2022 |
| Activa Activewear Limited | Wholesale & retail | 2023 |
| Activities for Improved Mood (AIM) Community Interest Company | Other services | 2022 |
| AD Property Solutions Ltd | Administrative & support | 2022 |
| Ad-Sol UK Limited | Construction | 2024 |
| Adam James Caldwell Ltd | Real estate | 2017 |
| Adea Group Ltd | Wholesale & retail | 2024 |
| Adforce U.K. Limited | Wholesale & retail | 1997 |
| Adrian Stawicki Transport Ltd. | Transport & logistics | 2016 |
| ADV Property Developments Ltd | Construction | 2023 |
| ADV Property Holdings Ltd | Construction | 2023 |
| Advance Aesthetics & Beauty Ltd | Other services | 2021 |
| Advance Electrical & Solar Limited | Construction | 2011 |
| Advance Land Development Ltd | Professional & scientific | 2014 |
| Advance Plant Hire Ltd | Administrative & support | 2023 |
| Advanced Roofing & Building Contractors Limited | Construction | 2002 |
| AEL Glazing Ltd | Wholesale & retail | 2010 |
| AEL Management Services Limited | Manufacturing | 2013 |
| Aeonian Investments Limited | Financial services | 2022 |
| Aesop Consulting Ltd | Professional & scientific | 2023 |
| Afterglow Design Limited | Information & communication | 2014 |
| AI Affiliates Limited | Information & communication | 2025 |
| AI Genesis Transport Ltd | Transport & logistics | 2024 |
| AIM Structure Ltd | Construction | 2022 |
| Aimee Louise Ltd | Professional & scientific | 2014 |
| Ainscough Hire Limited | Administrative & support | 1997 |
| Ainscough Limited | Manufacturing | 1997 |
| Ainscough Structures & Steel Processing Limited | Extraterritorial | 2014 |
| Airborne Bathroom Services Ltd | Construction | 2024 |
| AJ Corporation Ltd | Hospitality | 2022 |
| AJH Communication Services Ltd | Administrative & support | 2022 |
| AJW Property Investments Ltd | Real estate | 2022 |
| Akeso Healthcare Ltd | Health & social care | 2018 |
| AKF Interiors Ltd | Professional & scientific | 2022 |
| Akshadha Convenience Store Ltd | Wholesale & retail | 2024 |
| Aksonya Limited | Construction | 2018 |
| Albert Victor Scott Limited | Construction | 2025 |
| Alcohol Deliveries Limited | Administrative & support | 2013 |
| Alec Clinton Civils Ltd | Manufacturing | 2025 |
| Alex Inglis Limited | Extraterritorial | 2007 |
| Alex Sesh Limited | Transport & logistics | 2016 |
| Alexandra Motor Transport Ltd | Transport & logistics | 2020 |
| Aliant Technology Ltd | Transport & logistics | 2024 |