| Always a Pleasure Limited | Health & social care | 2020 |
| Amalawellness CIC | Education | 2021 |
| Amalka Ltd | Manufacturing | 2018 |
| Amberwood Solutions Ltd | Information & communication | 2011 |
| Ambience Hire Limited | Other services | 2007 |
| Amdk Services Ltd | Wholesale & retail | 2019 |
| American Nails Ltd | Other services | 2026 |
| AMH Autos Ltd | Wholesale & retail | 2013 |
| Amman Traders Ltd | Wholesale & retail | 2017 |
| AMR Construction Services Limited | Construction | 2002 |
| AMS Recovery Ltd | Transport & logistics | 2022 |
| Anderton Solutions Ltd | Administrative & support | 2011 |
| Andrew & JOE Transport Limited | Transport & logistics | 2017 |
| Andrew D Webb Ltd | Public administration | 2018 |
| Andrew K Denton Horticultural Engineer Ltd | Manufacturing | 1998 |
| Andy Holling Transport Limited | Transport & logistics | 2019 |
| Andy's Auto Repairs Limited | Wholesale & retail | 2015 |
| Angela Brown Associates Ltd | Professional & scientific | 2010 |
| Anglia Roof Repairs Ltd | Construction | 2025 |
| Ansdell Project Management Limited | Construction | 2008 |
| Anthony Carey Limited | Real estate | 1973 |
| Anton Trans Ltd | Transport & logistics | 2016 |
| AO Beauty Limited | Other services | 2019 |
| AOD Planning Ltd | Professional & scientific | 2014 |
| Apex Wildlife Management Ltd | Administrative & support | 2026 |
| Apperley Bridge Landscaping UK Ltd | Construction | 2020 |
| APR Building & Construction Limited | Construction | 2025 |
| APS Associates Ltd | Professional & scientific | 2021 |
| Aquastan Heating Limited | Manufacturing | 2002 |
| Aquatech Bathrooms, Kitchens, and Bedrooms Limited | Wholesale & retail | 2020 |
| Arable Crops Ltd | Agriculture & fishing | 2013 |
| Arch-Ead Properties Ltd | Real estate | 2024 |
| Archetype Financial Services Ltd | Financial services | 2017 |
| Arena One Limited | Professional & scientific | 2015 |
| Aristotle Teachers Ltd | Administrative & support | 2023 |
| ARK Facilities Limited | Construction | 2013 |
| Arkendale Group Ltd | Other services | 2022 |
| Art IS My Career (Aimc) C.I.C. | Education | 2022 |
| Art Sense Ltd | Wholesale & retail | 2026 |
| ASC Consultancy Services Limited | Professional & scientific | 2025 |
| Ascend Paraplanning Limited | Administrative & support | 2014 |
| Ascri Business Consulting Limited | Professional & scientific | 2002 |
| Ashton Bridge Ltd | Professional & scientific | 2022 |
| Ashworth PHG Ltd | Construction | 2023 |
| Askew Investments Limited | Agriculture & fishing | 1972 |
| ASL Nurseries Ltd | Agriculture & fishing | 2024 |
| Aspire Industries Limited | Construction | 2022 |
| Asquith Inns Ltd | Hospitality | 2025 |
| ASR Dental Care Elland Limited | Health & social care | 2021 |
| ASR Dental Care Hackenthorpe Limited | Health & social care | 2021 |
| ASR Dental Care Limited | Health & social care | 2015 |
| ASR Practice Holdings Limited | Health & social care | 2018 |
| ASR Practice Properties Limited | Households | 2021 |
| ASR Prosthetics Limited | Health & social care | 2018 |
| AT Home Vets Ltd | Professional & scientific | 2026 |
| Atam Signs Ltd | Manufacturing | 2023 |
| ATC Consulting Services Ltd | Professional & scientific | 2023 |
| ATC Property SPV Ltd | Real estate | 2026 |
| Atomic Business Ltd | Hospitality | 2019 |
| AU Electrical Ltd | Construction | 2026 |
| Aufguss Saunas Ltd | Manufacturing | 2025 |
| Aurora Consulting (Yorkshire) Limited | Professional & scientific | 2020 |
| Auto Bionics Ltd | Manufacturing | 2009 |
| Autoweb.Co.Uk Limited | Information & communication | 2005 |
| Awardtech Consultants Ltd | Other services | 2017 |
| Axiom Project Management Limited | Construction | 2011 |
| Axonexa Ltd | Information & communication | 2025 |
| AYAS07 Ltd | Hospitality | 2025 |
| B Beautiful Training Academy Limited | Extraterritorial | 2018 |
| B M Selby Ltd | Construction | 2016 |
| B P Raistrick Trading Limited | Wholesale & retail | 2023 |
| B. Noon Ltd | Construction | 2025 |
| B.E.P Electrical Ltd | Construction | 2025 |
| Babthorpe Hall Farm Limited | Agriculture & fishing | 2003 |
| Baca Ventures Ltd | Financial services | 2026 |
| Backoffice Nationwide Limited | Professional & scientific | 2012 |
| Balanced by Etches Ltd | Professional & scientific | 2025 |
| Bar NO8 Ltd | Hospitality | 2026 |
| Barff Farm Management Company Limited | Real estate | 2008 |
| Barmby Children's CIC | Administrative & support | 2018 |
| BB Motors (Hemingbrough) Ltd | Wholesale & retail | 2023 |
| BBB Events Limited | Hospitality | 2022 |
| BBF Invest Limited | Real estate | 2023 |
| Bcap Limited | Real estate | 2000 |
| BD28 Group Ltd | Public administration | 2019 |
| BE Aesthetic Clinic Ltd | Health & social care | 2015 |
| Bealolly Homes Ltd | Real estate | 2024 |
| Bean & Gone Coffee Limited | Wholesale & retail | 2018 |
| Beaumont Land Ltd | Real estate | 2025 |
| Beautiful Ethical Ltd | Wholesale & retail | 2020 |
| Beauty of Jane Ltd. | Information & communication | 2016 |
| Bedale Bar and Grill Ltd | Hospitality | 2025 |
| Bee-Able CIC | Health & social care | 2013 |
| Beech Court Cliffe (Management Company) Limited | Households | 2015 |
| Beech Tree Eyecare Limited | Wholesale & retail | 2011 |
| Beech Tree Living Ltd | Real estate | 2026 |
| Beech Tree Projects Ltd | Manufacturing | 2026 |
| Begoin Properties Ltd | Real estate | 2022 |
| Bel-Esprit Social Care Ltd | Health & social care | 2019 |
| Bespoke Flooring Kent Ltd | Construction | 2026 |