| Automated Industrial Robotics Wakefield Limited | Manufacturing | 1983 |
| Automotive Garages Services Limited | Wholesale & retail | 2023 |
| Automotive Storage & Recovery Ltd | Transport & logistics | 2018 |
| Auxilium Automotive Ltd | Professional & scientific | 2024 |
| AV Boxing and Fitness Ltd | Arts & recreation | 2018 |
| AVA Cleckheaton Ltd | Transport & logistics | 2025 |
| AVA Rose Hamilton Bridal Gowns Silsden Ltd | Wholesale & retail | 2007 |
| AVA Rose Hamilton Bridal Gowns UK Ltd | Wholesale & retail | 2012 |
| Avantara Ltd | Extraterritorial | 2019 |
| Avanti Traders Limited | Wholesale & retail | 2024 |
| Aventus Homes LLP | | 2016 |
| Avenue Bars Limited | Hospitality | 2016 |
| Avid Corporate Limited | Financial services | 2012 |
| Avid Partners LLP | | 2009 |
| Avillou Limited | Real estate | 2025 |
| AVL TEC Ltd | Information & communication | 2019 |
| AVN Dwellings Limited | Real estate | 2025 |
| Avolution AI Ltd | Information & communication | 2026 |
| Avrri Ltd | Wholesale & retail | 2021 |
| Awan Beds Ltd | Administrative & support | 2024 |
| Awesome Pictures Ltd | Administrative & support | 2025 |
| Awrevive Ltd | Wholesale & retail | 2024 |
| AWW Holdings Limited | Real estate | 2023 |
| Axchem (UK) Limited | Wholesale & retail | 2005 |
| Axes Prime Ltd | Information & communication | 2020 |
| Axia Healthcare Ltd | Administrative & support | 2025 |
| Axiom Consulting & Solutions Limited | Information & communication | 2025 |
| Axiom Resell Limited | Wholesale & retail | 2026 |
| Axiom Services Ltd | Professional & scientific | 2022 |
| Axis Realty Ltd | Real estate | 2025 |
| Axis Web | Information & communication | 1991 |
| Axora Digital Limited | Information & communication | 2019 |
| AY Pleck Ltd | Hospitality | 2017 |
| Ayeta Ltd | Professional & scientific | 2021 |
| Ayfa Logistics Limited | Transport & logistics | 2025 |
| Ayla Holdings Limited | Real estate | 2017 |
| Ayo's Realty Ltd | Real estate | 2023 |
| Ayodhya SRI Rama Ltd | Real estate | 2024 |
| Ayom's Solutions Ltd | Construction | 2026 |
| Ayoub&Sons Ltd | Wholesale & retail | 2025 |
| Ayub Healthcare Ltd | Health & social care | 2021 |
| AZ Asset Management Ltd | Real estate | 2016 |
| Azam IE Properties Ltd | Real estate | 2026 |
| Azizos 18 Ltd | Health & social care | 2018 |
| Azmoda Ltd | Wholesale & retail | 2021 |
| Aztec Suntan Studio Limited | Other services | 2003 |
| Azurebuild Limited | Real estate | 2007 |
| AZZ Consultancy Ltd | Professional & scientific | 2026 |
| B & K Optical Limited | Health & social care | 2014 |
| B & P Windows Ltd | Construction | 2014 |
| B & W (Wakefield) Developments Limited | Real estate | 2003 |
| B & W Investments Limited | Real estate | 2007 |
| B Brand Designs Ltd | Construction | 2025 |
| B C K Electrical Limited | Construction | 2003 |
| B V Leasing Ltd | Extraterritorial | 2015 |
| B Well - Physiotherapy and Body Fitness Ltd | Health & social care | 2022 |
| B Xpresd Ltd | Transport & logistics | 2019 |
| B&B Cars Sale Limited | Wholesale & retail | 2025 |
| B&B Johnson Services Ltd | Public administration | 2025 |
| B&B Motors Wakefield Limited | Wholesale & retail | 2025 |
| B&D Business Solutions Limited | Administrative & support | 2025 |
| B&F Solutions Ltd | Information & communication | 2024 |
| B&W Building and Landscaping Limited | Construction | 2021 |
| B'Home Letting Limited | Real estate | 2021 |
| B-Same Limited | Wholesale & retail | 2024 |
| B.A.Z Tool & Hardware Supplies Ltd | Wholesale & retail | 2019 |
| B.H.M. (Fifth Avenue) Limited | Real estate | 1991 |
| B.I.C Essentials Ltd | Administrative & support | 2022 |
| B19 Fitness Ltd | Arts & recreation | 2022 |
| BA 56 Digital Hub Ltd | Wholesale & retail | 2026 |
| Babtooma Leeds Ltd | Hospitality | 2020 |
| Baby Reindeer Ltd | Households | 2024 |
| Babybeats Global Limited | Health & social care | 2021 |
| Back in Action (Rehabilitation) Limited | Other services | 2003 |
| Back in Action Consultancy Limited | Other services | 2004 |
| BACK2LIFE Automotive Ltd | Wholesale & retail | 2026 |
| Backbench Limited | Information & communication | 2014 |
| Backhouse Properties Ltd | Real estate | 2021 |
| BAF Motorsport Limited | Manufacturing | 2017 |
| Baflyn Ltd | Wholesale & retail | 2025 |
| Bagaara Roundhay Ltd | Hospitality | 2025 |
| Bagged-It Limited | Wholesale & retail | 2024 |
| Baggys TV Limited | Wholesale & retail | 2023 |
| Bags and Covers Direct Holdings Limited | Financial services | 2026 |
| Bags and Covers Direct Limited | Manufacturing | 2014 |
| Bahamas Loco Trading Ltd. | Arts & recreation | 1991 |
| Bahson Colour Print Limited | Manufacturing | 1996 |
| Bahson Holdings Limited | Financial services | 2019 |
| Bailey Gilbert Properties Ltd | Real estate | 2022 |
| Bailey Rose Limited | Construction | 2000 |
| Bair Group Ltd | Wholesale & retail | 2024 |
| Bajjali | Professional & scientific | 2016 |
| Baker Family Holdings (Yorkshire) Ltd | Real estate | 2026 |
| Bakery Spares Ltd | Manufacturing | 2015 |
| Bakes by Vanilla Bean Ltd | Hospitality | 2022 |
| Balagueuri Limited | Information & communication | 1998 |
| Baldeo Industries Ltd | Professional & scientific | 2018 |
| Balderty Limited | Real estate | 2020 |
| Baldwin & Bedford Limited | Real estate | 2019 |
| Baldwin's Bathrooms & Tiling Ltd | Construction | 2025 |