| Abacus Cost Consultants Ltd | Professional & scientific | 2008 |
| Abbas Wholesalers Limited | Wholesale & retail | 2025 |
| Abbassi Hajj & Umrah Limited | Administrative & support | 2026 |
| Abbey Artstone Limited | Manufacturing | 2011 |
| Abbey Lodge (Shipley) Limited | Hospitality | 2010 |
| Abbey Lodge Holdings Limited | Financial services | 2026 |
| Abbott Holdings Group Limited | Real estate | 2025 |
| Abbott Renovations & Developments Limited | Construction | 2025 |
| Abdulla Properties Limited | Real estate | 2025 |
| Abedin Real Estate Limited | Real estate | 2021 |
| Abfab Cheesecakes Limited | Wholesale & retail | 2024 |
| Abi-May's Little Angels LLP | | 2016 |
| ABK Transport Limited | Transport & logistics | 2025 |
| Abrol Investments Limited | Real estate | 2021 |
| Absolute Cooling Tower Services Ltd | Manufacturing | 2011 |
| Absolutely Purrfect Cattery Limited | Agriculture & fishing | 2024 |
| ABU Zahra Carers Limited | Health & social care | 2012 |
| Abundance of Happiness Limited | Health & social care | 2025 |
| Abundant House Properties Ltd | Real estate | 2023 |
| AC Trades Ltd | Professional & scientific | 2025 |
| Acamar Properties Limited | Real estate | 2016 |
| Accent Direct Marketing Limited | Professional & scientific | 2003 |
| Accerna Finance Ltd | Professional & scientific | 2025 |
| Accessible Hire Ltd | Transport & logistics | 2023 |
| Accessible Products Limited | Manufacturing | 2017 |
| Accessible Vehicles Ltd | Extraterritorial | 2016 |
| Accord Immigration Advice Limited | Professional & scientific | 2026 |
| Accountax-Kly Limited | Professional & scientific | 2021 |
| Accounting for Business Limited | Professional & scientific | 2007 |
| Accutrace Ltd | Construction | 2025 |
| Acdm Bar Management Ltd | Hospitality | 2019 |
| Ace Elevators (Northern) Limited | Manufacturing | 2017 |
| Ace Taekwondo Academy Limited | Education | 2025 |
| Acetarc Holdings Ltd | Real estate | 2015 |
| Acetarc Limited | Manufacturing | 1970 |
| Acetarc Welding & Engineering Company Limited | Manufacturing | 2019 |
| Acre Lane Management Limited | Households | 2016 |
| ACT Counselling & Wellbeing Ltd | Education | 2024 |
| Action Point Community Support Services | Health & social care | 2001 |
| Active Hydraulics (UK) Ltd | Manufacturing | 2007 |
| Active Hydraulics Limited | Extraterritorial | 2011 |
| Actualise the Potential Ltd | Professional & scientific | 2023 |
| Acumen London Consulting Ltd | Administrative & support | 2016 |
| AD Cars Keighley Ltd | Wholesale & retail | 2022 |
| AD Rose Property Ltd | Real estate | 2019 |
| ADA Care Limited | Health & social care | 2007 |
| Adam Barber (Keighley) Limited | Other services | 2025 |
| Adam Motors Limited | Wholesale & retail | 2024 |
| Adam Soloman Consulting Limited | Professional & scientific | 2019 |
| Adams Way Skipton Limited | Households | 2025 |
| Addis Construction Limited | Construction | 2007 |
| Addventure Vans Ltd | Wholesale & retail | 2026 |
| Addworth Leads Limited | Information & communication | 2017 |
| Addyson Thwaites Limited | Wholesale & retail | 2024 |
| Adeptro Window Cleaning Ltd | Administrative & support | 2006 |
| Adith Ltd | Wholesale & retail | 2026 |
| ADL Quality Care Limited | Health & social care | 2015 |
| Advanced Climbing Solutions Limited | Arts & recreation | 2021 |
| Advanced Couplings Limited | Manufacturing | 1988 |
| Advanced Hydraulics Group Ltd | Financial services | 2018 |
| Advanced Hydraulics Ltd. | Manufacturing | 2010 |
| Advertsgalore Limited | Professional & scientific | 2012 |
| Aegex Technologies Ltd | Manufacturing | 2015 |
| Afia Properties Ltd | Real estate | 2024 |
| AFM Properties WY Ltd | Real estate | 2023 |
| AFM Training Solutions Ltd | Education | 2025 |
| Afplay Ltd | Arts & recreation | 2025 |
| After Dark North Limited | Hospitality | 2020 |
| AGA Managment Services Ltd | Real estate | 2017 |
| Agency for Good Ltd | Information & communication | 2018 |
| Agenttech Ltd | Information & communication | 2025 |
| Agfabs Limited | Other services | 2025 |
| AGH Solutions Limited | Administrative & support | 2017 |
| Agile Business Analytics Ltd | Professional & scientific | 2013 |
| AGM Colour Ltd | Administrative & support | 2011 |
| AGR (Holdings) Limited | Financial services | 2015 |
| AGR Racking Limited | Manufacturing | 2011 |
| AGR Residential Limited | Real estate | 2023 |
| AHA Property Investment Ltd | Real estate | 2020 |
| Ahcl Limited | Other services | 2022 |
| Ahiautos Ltd | Wholesale & retail | 2025 |
| AHJ Assets Ltd | Real estate | 2025 |
| AHJ Group Ltd | Real estate | 2021 |
| AHM Holdings Ltd | Real estate | 2026 |
| Ahmed Medical Locums Ltd | Health & social care | 2018 |
| Ahmed Properties Keighley Limited | Real estate | 2024 |
| Ahmed Solutions Limited | Financial services | 2018 |
| Ahmed,S Food Limited | Wholesale & retail | 2017 |
| Ahmeds Halal Meat Limited | Wholesale & retail | 2023 |
| AHR Estates Limited | Real estate | 2018 |
| AHR Healthcare Limited | Other services | 2016 |
| AI Money Trade Ltd | Wholesale & retail | 2025 |
| Aidan Car & Commercial Ltd | Construction | 2016 |
| Aidan Severs Consulting Ltd | Education | 2022 |
| Aidmark Immigration Limited | Information & communication | 2008 |
| Aiesha H Holding Ltd | Financial services | 2025 |
| Aiesha Hussain Limited | Wholesale & retail | 2023 |
| Aiexcelguy Ltd | Professional & scientific | 2026 |
| AIF Development Limited | Extraterritorial | 2016 |
| Aiia Global Ltd | Hospitality | 2023 |