| A Better Night Hotel Limited | Hospitality | 2024 |
| A C Chesters & SON Limited | Extraterritorial | 1991 |
| A Collective MCR CIC | Arts & recreation | 2025 |
| A Double a Ltd | Professional & scientific | 2024 |
| A FEW Houses Ltd | Real estate | 2021 |
| A Gough Roofing Limited | Construction | 2017 |
| A J M Transport Services Limited | Transport & logistics | 2005 |
| A Moment Held Still Ltd | Wholesale & retail | 2025 |
| A Place to Buy Limited | Real estate | 2020 |
| A Place to Rent Limited | Real estate | 2020 |
| A Private Company Ltd | Other services | 2023 |
| A R F Plant Limited | Construction | 2013 |
| A Random Name Limited | Professional & scientific | 2023 |
| A S Builders (MCR) Ltd | Construction | 2019 |
| A Square Investment Property LLP | | 2024 |
| A Vlachos Brothers Productions Limited | Information & communication | 2025 |
| A Y a R Properties Limited | Other services | 2016 |
| A&A Limited | Professional & scientific | 2026 |
| A&A's Properties Ltd | Real estate | 2023 |
| A&A's Property Estate Limited | Real estate | 2025 |
| A&D Engineering Services Ltd | Professional & scientific | 2025 |
| A&G Brothers Convenience Store Limited | Wholesale & retail | 2025 |
| A&J Properties Partnership LLP | | 2016 |
| A&R Meats (NW) Limited | Wholesale & retail | 2017 |
| A, K & B Ltd | Real estate | 2024 |
| A-Tech IT Services Limited | Information & communication | 2013 |
| A-Tech Repair Centre Ltd | Information & communication | 2015 |
| A. J. LEE & Associates Limited | Financial services | 2010 |
| A.D.D. Transport Ltd | Transport & logistics | 2013 |
| A.I. Translating Limited | Administrative & support | 2008 |
| A.Labib Limited | Wholesale & retail | 2018 |
| A.M Blade Repair Ltd | Manufacturing | 2024 |
| A.Moore Holdings Limited | Financial services | 2020 |
| A.Moore Software Limited | Information & communication | 2026 |
| A.O Wane Property Ltd | Real estate | 2024 |
| A1 24/7 Best Plumbers Limited | Construction | 2025 |
| A2 Properties Ltd | Real estate | 2021 |
| A2B Haulage Ltd | Transport & logistics | 2025 |
| A5QUALITY Ltd | Wholesale & retail | 2020 |
| AA Fashions Ltd | Other services | 2025 |
| AA Removals Ltd | Water & waste | 2023 |
| Aaabuilds Services Limited | Construction | 2025 |
| Aacakar Ltd | Wholesale & retail | 2020 |
| AAE Estates Ltd | Real estate | 2026 |
| Aafm Properties Ltd | Real estate | 2024 |
| Aali Solutions Limited | Wholesale & retail | 2025 |
| AAM Appliances Ltd | Wholesale & retail | 2018 |
| AAM Maintenance Limited | Construction | 2009 |
| Aamari Limited | Real estate | 2020 |
| Aaron Terence Hughes Ltd | Wholesale & retail | 2019 |
| Aasta Sports Limited | Wholesale & retail | 2014 |
| AB and N Holdings Ltd | Financial services | 2000 |
| AB Seminary Ltd | Education | 2017 |
| Abacus Estates Limited | Real estate | 1998 |
| Abamwe Ltd | Other services | 2025 |
| Abaris Limited | Real estate | 1974 |
| Abataz Digital Solutions Ltd | Information & communication | 2023 |
| Abba Delight Limited | Water & waste | 2025 |
| Abbah Limited | Real estate | 2019 |
| Abbey Prestige Holdings Limited | Financial services | 2017 |
| Abbey Prestige Homes (Helsby) Limited | Construction | 2017 |
| Abbey Prestige Homes (NW) Limited | Construction | 2020 |
| Abbey Prestige Lettings Limited | Real estate | 2016 |
| Abbey Woods Management Company Limited | Extraterritorial | 2023 |
| ABC Fostering Limited | Health & social care | 2025 |
| ABC Fundraising Ltd | Wholesale & retail | 2020 |
| ABC Textile Recycling Ltd | Wholesale & retail | 2021 |
| Abchem Ltd | Hospitality | 2016 |
| Abcmixuk Ltd | Wholesale & retail | 2023 |
| Abdos Construction Limited | Construction | 2024 |
| Abdres. Ltd | Other services | 2020 |
| Abeed Khalid Ltd | Health & social care | 2018 |
| Abeks Ltd | Administrative & support | 2026 |
| Abeles PC Solutions Limited | Information & communication | 2017 |
| Abeles Property Limited | Real estate | 2010 |
| Abenzy Education Limited | Professional & scientific | 2025 |
| Aberdeen Securities Limited | Real estate | 2023 |
| Abia Building and Joinery Limited | Construction | 2024 |
| Abifa Enterprises Ltd | Wholesale & retail | 2026 |
| Abigail Lucy Ltd | Other services | 2017 |
| Able Facility Solutions Limited | Construction | 2014 |
| Able Healthcare Construction Ltd | Administrative & support | 2019 |
| Ablemail Electronics Limited | Extraterritorial | 2000 |
| Ablik Ltd | Real estate | 2020 |
| Abode SSH Limited | Construction | 2022 |
| Abraham & Family Limited | Other services | 2021 |
| ABS Training Ltd | Education | 2018 |
| Absolute Loveliness Ltd | Administrative & support | 2024 |
| ABT Law LLP | | 2008 |
| Abtl 1 Ltd | Administrative & support | 2026 |
| Abundance Estates Ltd | Real estate | 2021 |
| ABZ MCR Ltd | Hospitality | 2021 |
| AC Watch Repairs Ltd | Other services | 2023 |
| Academiqmaestro Ltd | Education | 2025 |
| Academy 4 Limited | Education | 2016 |
| Acanthus Craft Ltd | Manufacturing | 2024 |
| ACCESS4 Ltd | Information & communication | 2023 |
| Accessairbility Ltd | Information & communication | 2018 |
| Accessory Land Ltd | Wholesale & retail | 2017 |
| Accident Intelligence (Manchester) Limited | Wholesale & retail | 2025 |