| 1 - Bridge Ltd | Information & communication | 2019 |
| 1 Wants IT Ltd | Construction | 2009 |
| 199696 Limited | Other services | 2018 |
| 1ST Look Fire & Security Solutions Limited | Administrative & support | 2024 |
| 1ST Look Fire & Security Systems Limited | Administrative & support | 2021 |
| 24/7 Security Protection Ltd | Administrative & support | 2020 |
| 24/7 Surveilance Security Ltd | Administrative & support | 2021 |
| 303 Transport Ltd | Transport & logistics | 2015 |
| 3R Property Group Ltd | Real estate | 2026 |
| 3R Sustainable Products Ltd | Wholesale & retail | 2011 |
| 4T Vocational Training Services Limited | Extraterritorial | 2013 |
| 4TECH Moto Limited | Wholesale & retail | 2005 |
| 4TECH Training Limited | Education | 2012 |
| 5 Axis Recruitment Limited | Administrative & support | 2024 |
| A & a Business Consulting Ltd | Professional & scientific | 2024 |
| A & a Food Group Ltd | Wholesale & retail | 2023 |
| A C Systems (AV) Limited | Manufacturing | 2015 |
| A J Alignment Ltd | Professional & scientific | 2009 |
| A W Grounds Ltd | Administrative & support | 2021 |
| A&G Day Building and Construction Ltd | Construction | 2019 |
| A-One Kitchens and Bedrooms Ltd | Manufacturing | 2017 |
| A. Binns & Co Limited | Agriculture & fishing | 2008 |
| A. C. Joiner's Limited | Construction | 2014 |
| Aadi Aditi Limited | Health & social care | 2012 |
| About Coffee Limited | Hospitality | 2019 |
| ABT Ventures Ltd | Information & communication | 2020 |
| Acacia Education Ltd | Education | 2014 |
| Acacia Education Solutions Ltd | Education | 2011 |
| Accessible Ltd | Education | 2013 |
| Acorn Childrens Services Limited | Health & social care | 2023 |
| Adam Decorating Ltd | Construction | 2024 |
| Adam James Associates Limited | Administrative & support | 2016 |
| Adam Mark Architectural Metalwork Ltd | Manufacturing | 2011 |
| Adesso Occupational Health & Wellbeing Ltd | Health & social care | 2023 |
| Advanced Guttering Ltd | Construction | 2023 |
| ADW Engineering NW Ltd | Professional & scientific | 2015 |
| Aecco Limited | Wholesale & retail | 2005 |
| Aerofoil Manufacturing Solutions Limited | Manufacturing | 2015 |
| Aeroinsight Ltd | Professional & scientific | 2025 |
| AGH Landscapes Limited | Administrative & support | 2025 |
| AI Nolimit Ltd | Information & communication | 2025 |
| Air Logic Ltd | Wholesale & retail | 2019 |
| Aire Valley Independent Traders Ltd | Manufacturing | 2018 |
| Airey Estates Ltd | Construction | 2025 |
| Airport Exclusive Travel & Escort Taxis Ltd | Transport & logistics | 2015 |
| AJ Clough Properties Limited | Real estate | 2020 |
| AJ Legacy Investments Limited | Financial services | 2025 |
| AKM EV Group Ltd | Construction | 2025 |
| AL Pacino's Pizza & Kebab House Ltd | Hospitality | 2023 |
| Albert House Residential Home Ltd. | Health & social care | 2002 |
| Alchemist IT Ltd | Information & communication | 2022 |
| Alkincoats View Management Company Limited | Households | 2020 |
| ALL About the Sparkle Beauty Limited | Other services | 2014 |
| ALM Imports Limited | Wholesale & retail | 2016 |
| ALM Texsource Ltd | Professional & scientific | 2014 |
| Almp Developments Limited | Real estate | 2017 |
| Amelia Humberstone Ltd | Professional & scientific | 2023 |
| Amir Haroon Ltd | Administrative & support | 2015 |
| AN Marketing Consultancy Ltd | Administrative & support | 2024 |
| Ananta Ltd | Health & social care | 2018 |
| Ananta Ventures Ltd | Financial services | 2021 |
| Anaz Takeaway (Colne) Ltd | Hospitality | 2025 |
| Anchor Management Project Ltd | Education | 2025 |
| Anchor Point Project CIC | Education | 2025 |
| Angie KEM Limited | Other services | 2021 |
| Anotek (UK) Ltd | Manufacturing | 2018 |
| Anyting Limited | Education | 2011 |
| Apex Alternative Provision Education Limited | Education | 2022 |
| APF (Holdings) Ltd | Financial services | 2018 |
| APT Productions Limited | Manufacturing | 2021 |
| Aquarius Acoustics Ltd | Information & communication | 2013 |
| ARC Elevators Limited | Manufacturing | 2009 |
| ARC Joinery and Landscaping Ltd | Construction | 2023 |
| Arcade Cafe Ltd | Hospitality | 2012 |
| Arcol Engineering Limited | Manufacturing | 2005 |
| Area Nostalgia Ltd | Manufacturing | 2025 |
| Arista (U.K.) Limited | Wholesale & retail | 1973 |
| Arista (UK) Holdings Ltd | Financial services | 2025 |
| Armitage Electrical Services Limited | Construction | 2010 |
| Aron Douglas Ltd | Wholesale & retail | 2019 |
| Artclub Creative Ltd | Information & communication | 2012 |
| Askew Holdings Limited | Extraterritorial | 2017 |
| Askew Refrigeration Services Limited | Construction | 1988 |
| Association of Massage and Manipulative Therapists Limited | Other services | 2011 |
| Atomus Electrical Ltd | Construction | 2021 |
| Autoai Limited | Information & communication | 2024 |
| Autosmash Limited | Wholesale & retail | 2014 |
| Auxillium Futures Limited | Administrative & support | 2019 |
| Avail Management Ltd | Real estate | 2016 |
| Axiom Legacy Ltd | Information & communication | 2026 |
| AYS Support Ltd | Administrative & support | 2017 |
| Azdelivery Ltd | Transport & logistics | 2026 |
| Azino Ltd | Other services | 2012 |
| Aztec GAS Limited | Construction | 2014 |
| B & D Groundworks Ltd | Construction | 2003 |
| B & L Projects Ltd | Professional & scientific | 2024 |
| B&M Building & Timber Supplies Limited | Wholesale & retail | 2017 |
| B&S Goldsun Ltd | Administrative & support | 2025 |
| B.G. Sports International Ltd | Manufacturing | 1995 |
| Banny's Limited | Hospitality | 2007 |