| Abbeycars (Wakefield) Limited | Transport & logistics | 1987 |
| Abbeydale Geoscience Limited | Professional & scientific | 2008 |
| Abby Banham Childcare Ltd | Health & social care | 2022 |
| ABC Cars (Wfld) Ltd | Transport & logistics | 2011 |
| ABC Properties Holding Ltd | Real estate | 2024 |
| Abdelhady Medical Ltd | Health & social care | 2025 |
| Abdichtungstechnik MS Limited | Construction | 2005 |
| Abdul BEI Ltd | Health & social care | 2016 |
| Abdul Rahman Traders Ltd | Wholesale & retail | 2025 |
| Abelian Design Limited | Information & communication | 2013 |
| Aberdonian Business Consulting Ltd | Professional & scientific | 2026 |
| Abigail Kimberly Ltd | Professional & scientific | 2024 |
| Able Sterling Property & Development Limited | Real estate | 2007 |
| Abode Builders Ltd | Construction | 2006 |
| Abouelkhair Ltd | Health & social care | 2023 |
| Abrafix Ltd | Wholesale & retail | 2009 |
| Abraham Real Estate Limited | Real estate | 2018 |
| Abrakadabra Limited | Other services | 2024 |
| Absa Consultancy Limited | Health & social care | 2015 |
| Absolutely Fabulous Curtains and Blinds Yorkshire Limited | Manufacturing | 2021 |
| Absolutelywakey Ltd | Wholesale & retail | 2018 |
| Absr Property Group Ltd | Real estate | 2024 |
| ABT Group (Yorkshire) Ltd | Transport & logistics | 2023 |
| Abusins Muay Thai Ltd | Arts & recreation | 2025 |
| AC Corporate Holding Limited | Professional & scientific | 2014 |
| AC Developments Ltd | Real estate | 2026 |
| AC GAS & Renewables Ltd | Construction | 2023 |
| Academic Achievements Limited | Education | 2023 |
| Acaster Malbis Community Events Ltd | Other services | 2020 |
| Accent IT Consulting Ltd | Information & communication | 2000 |
| Access and Integrity Limited | Construction | 2015 |
| Acclaim Safety Systems Limited | Information & communication | 2000 |
| Accomplish Multi Academy Trust Limited | Education | 2011 |
| Accounts Connect Limited | Professional & scientific | 2017 |
| Ace Base Wakefield Ltd | Transport & logistics | 2017 |
| Ace Car Wash Limited | Administrative & support | 2021 |
| Ace Carwash Wakefield Limited | Administrative & support | 2025 |
| Ace Denta Ltd | Health & social care | 2015 |
| Ace Drilling Services Limited | Construction | 2017 |
| Ace POS Ltd | Information & communication | 2023 |
| Ace Tyres Wakefield Ltd | Wholesale & retail | 2022 |
| Acentrix Digital Limited | Information & communication | 2024 |
| Acentrix Ltd | Financial services | 2022 |
| ACG Accountants Limited | Professional & scientific | 2024 |
| Ackworth Hand Car Wash Ltd | Other services | 2019 |
| Ackworth Service Station Ltd | Wholesale & retail | 2002 |
| ACL Financial Solutions Limited | Professional & scientific | 2013 |
| Acoite Enterprise Management Ltd | Real estate | 2024 |
| Acorn Book-Keeping (Yorkshire) Limited | Professional & scientific | 2003 |
| Acorn Driveways Wakefield Ltd | Construction | 2026 |
| Acquiring & Retiring Ltd | Administrative & support | 2015 |
| ACT Roofing Ltd | Construction | 2004 |
| Actanol Service Ltd. | Professional & scientific | 2004 |
| Active Reactive Solutions Ltd | Water & waste | 2025 |
| ACTIVEK9SECURITY Ltd | Administrative & support | 2022 |
| Activia Associates Ltd | Real estate | 1999 |
| Actuateyou Ltd | Professional & scientific | 2025 |
| Acuitycare Limited | Health & social care | 2023 |
| Acur Services Ltd | Information & communication | 2020 |
| AD Pipework Limited | Manufacturing | 2014 |
| ADA Property Developments Limited | Construction | 2024 |
| Adalaisa Aesthetics Ltd | Health & social care | 2026 |
| Adam Brambles Limited | Real estate | 2003 |
| Adam Home Interiors Ltd | Manufacturing | 2021 |
| Adam&Anas Medical Ltd | Health & social care | 2025 |
| Adamas CC Limited | Administrative & support | 2011 |
| ADD COO Ltd | Wholesale & retail | 2020 |
| Addingford Engineering Limited | Manufacturing | 2022 |
| Addingford Investments Ltd | Real estate | 2026 |
| Addison Agricultural Ltd | Agriculture & fishing | 2025 |
| Addison Group Ltd | Professional & scientific | 2019 |
| Address Property Developments Ltd | Real estate | 2021 |
| Address Property Management Ltd | Real estate | 2021 |
| Adele the Dress Fitter Limited | Other services | 2022 |
| Adeline Waterson Ltd | Manufacturing | 2024 |
| Adeniyi & Uwuma Property Limited | Real estate | 2023 |
| Adept Care Limited | Information & communication | 2015 |
| Adept Exteriors Limited | Construction | 2020 |
| Adept Konsult Limited | Real estate | 2022 |
| Adept Site Services Ltd | Professional & scientific | 2020 |
| Adept Solutions (GB) Limited | Manufacturing | 2003 |
| Adewale Alade Limited | Wholesale & retail | 2025 |
| Adham Hotels Ltd | Hospitality | 2020 |
| Adham HR Hotel Ltd | Hospitality | 2021 |
| Adhd in Mind Ltd | Health & social care | 2025 |
| Adif Brokerage Ltd. | Information & communication | 2011 |
| Adjutus Ltd | Real estate | 2014 |
| ADL & Partners Limited | Administrative & support | 2025 |
| ADL Derby Limited | Health & social care | 2015 |
| ADL Leased Homes Ltd | Health & social care | 1990 |
| ADL Liverpool Limited | Health & social care | 2015 |
| ADL PLC | Professional & scientific | 1990 |
| ADM Auto Detailing Ltd | Administrative & support | 2020 |
| ADM GEE Holding Co Ltd | Transport & logistics | 2026 |
| Admetec UK Ltd | Manufacturing | 2025 |
| Admin Hub Ltd | Professional & scientific | 2019 |
| ADMIN4IT Ltd. | Other services | 2008 |
| Adnar Limited | Real estate | 2019 |
| Adorable Beauty T/A Serenity Beauty and Skin Therapies Ltd | Health & social care | 2020 |
| ADR Events Limited | Information & communication | 2019 |