| A Mazery Stays Ltd | Real estate | 2024 |
| A Motors Ltd | Wholesale & retail | 2019 |
| A O'Halloran Ltd | Administrative & support | 2019 |
| A Raja Pharma Ltd | Health & social care | 2019 |
| A S Driver Supply Ltd | Transport & logistics | 2018 |
| A Star Private Hire Limited | Transport & logistics | 2019 |
| A T Graphics (WY) Ltd | Manufacturing | 2016 |
| A Trans Ltd | Transport & logistics | 2015 |
| A Virtual Experience With Ltd | Administrative & support | 2017 |
| A W Contracting & Project Management Limited | Construction | 2023 |
| A W Equestrian Services Ltd | Arts & recreation | 2018 |
| A W Equine Housing Ltd | Agriculture & fishing | 2018 |
| A Wright Landscapes Ltd | Administrative & support | 2019 |
| A ZEB Locums Limited | Health & social care | 2024 |
| A&M Facilities Ltd | Construction | 2016 |
| A&T Bathroom Distribution Ltd | Wholesale & retail | 2019 |
| A,D8 UK Limited | Hospitality | 2004 |
| A-Line Creativity Ltd | Information & communication | 2020 |
| A-Up Business Planning and Design Ltd | Professional & scientific | 2014 |
| A-Z Halifax Group Ltd | Wholesale & retail | 2024 |
| A-Z Motor Factors (Halifax) Ltd | Wholesale & retail | 2024 |
| A-Z Properties Halifax Ltd | Real estate | 2024 |
| A. P. a. Bars Yorkshire Ltd | Hospitality | 2022 |
| A. R. Machinery Ltd | Administrative & support | 2003 |
| A. Subramanian Ltd | Health & social care | 2015 |
| A.B. Terratec (Holdings) Limited | Financial services | 2026 |
| A.B. Terratec Limited | Manufacturing | 1983 |
| A.Coletta & Sons Limited | Manufacturing | 1959 |
| A.D.D. Family Investments Ltd | Financial services | 2025 |
| A.E. Jones Fabrication and Welding Engineers Limited | Professional & scientific | 2024 |
| A.Hinchliffe & Co Limited | Wholesale & retail | 2019 |
| A.I. Heating and Plumbing Limited | Construction | 2022 |
| A.J. International Consultancy Specialists Ltd | Professional & scientific | 2023 |
| A.Med Ltd | Health & social care | 2021 |
| A.O Krispy Limited | Hospitality | 2026 |
| A.R.P. Security Services Limited | Wholesale & retail | 1984 |
| A.Rr Logistics Ltd | Transport & logistics | 2026 |
| A.W. (Europe) Limited | Manufacturing | 1980 |
| A.Walker Joinery Ltd | Construction | 2023 |
| A.Y Construction Servies Limited | Construction | 2024 |
| A.Z.O. Limited | Manufacturing | 1993 |
| A1 Performance Tyres Ltd | Wholesale & retail | 2026 |
| A1 QU33NS Road Tyres Ltd | Wholesale & retail | 2022 |
| A1 Ziggys Ltd | Transport & logistics | 2019 |
| A4 Barcodes Limited | Wholesale & retail | 2015 |
| AA Cars (HX) Ltd | Wholesale & retail | 2024 |
| AA Platinum Group Ltd | Wholesale & retail | 2026 |
| AA Vehicle Solutions Limited | Administrative & support | 2012 |
| AAA Accountants Yorkshire Ltd | Professional & scientific | 2024 |
| AAB Contracting Limited | Construction | 2014 |
| AAC Forklifts Ltd | Wholesale & retail | 2023 |
| AAH Renovations Ltd | Construction | 2023 |
| AAI Consultants Limited | Information & communication | 2023 |
| Aannoo Limited | Professional & scientific | 2012 |
| Aarmco Ltd | Manufacturing | 2021 |
| Aarondale Accountancy Services Limited | Professional & scientific | 1987 |
| Aarya Property Investments Limited | Real estate | 2018 |
| Aashritha Consultancy Ltd | Professional & scientific | 2011 |
| Aati Courier Ltd | Transport & logistics | 2020 |
| Aaxp Ltd | Other services | 2026 |
| AB Auto-Works Ltd | Wholesale & retail | 2015 |
| AB Engineering Solutions Ltd | Manufacturing | 2022 |
| AB Home Improvements Limited | Construction | 2013 |
| AB Leeds Plumbing & Heating Ltd | Construction | 2018 |
| AB Open Ltd | Information & communication | 2012 |
| Abacus Accountants Halifax Ltd | Professional & scientific | 2019 |
| Abacus Business Advisors Ltd | Professional & scientific | 2012 |
| Abacus Fabrications Ltd | Manufacturing | 2021 |
| Abal Rental Limited | Administrative & support | 2004 |
| Abbacus Blinds Limited | Manufacturing | 2005 |
| Abbey Bell QS Services Limited | Professional & scientific | 2020 |
| Abbrecus Ltd | Professional & scientific | 2013 |
| Abbytech Windows & Doors Ltd | Construction | 2021 |
| ABC Solicitors Yorkshire Limited | Professional & scientific | 2014 |
| Abco Nursery Limited | Health & social care | 2019 |
| Abels Joiners Limited | Construction | 2003 |
| Abex Engineering Limited | Professional & scientific | 1987 |
| ABG Trans Ltd | Transport & logistics | 2024 |
| Abhiyanta Consultancy Services Ltd | Professional & scientific | 2025 |
| Ability Bathe (Devon) Ltd | Other services | 2018 |
| Ability Bathe Holdings Ltd | Financial services | 2019 |
| Ability WET Rooms Ltd | Manufacturing | 2014 |
| Abis Land Limited | Other services | 2024 |
| Abis Management NO1 Ltd | Other services | 2024 |
| Ablle Group Limited | Professional & scientific | 2025 |
| ABR Joinery Limited | Construction | 2016 |
| ABR Locums Ltd | Health & social care | 2018 |
| ABS (U.K.) Limited | Wholesale & retail | 1992 |
| Absolutely Smashed Ltd | Hospitality | 2025 |
| ABW Properties Ltd | Real estate | 2015 |
| Academic Advanced Group Ltd | Education | 2025 |
| Acai & Thrive Limited | Hospitality | 2025 |
| Access Denied Auto Locksmith Ltd | Other services | 2024 |
| Access Egress Ltd | Administrative & support | 2015 |
| Access the World Limited | Real estate | 2022 |
| Access the World Travel Limited | Administrative & support | 2024 |
| Accessible Experiences Ltd | Information & communication | 2016 |
| Accountancy Extra Limited | Professional & scientific | 2003 |
| Accounting Sheep Limited | Professional & scientific | 2016 |
| Accoutre Limited | Real estate | 2021 |