| A Bramall and Company | Real estate | 2014 |
| A D Bell Group Limited | Professional & scientific | 2005 |
| A D Broadbent & Co Limited | Administrative & support | 2002 |
| A Film by GUY Limited | Information & communication | 2014 |
| A Fitness Limited | Arts & recreation | 2014 |
| A J Consulting (UK) Limited | Professional & scientific | 2014 |
| A J Meehan Limited | Financial services | 2020 |
| A L Production Services Ltd | Information & communication | 2022 |
| A Mackie Ltd | Real estate | 2022 |
| A P Cook Electrical Limited | Energy | 2013 |
| A Parish Heating Limited | Construction | 2015 |
| A Parker Consulting Limited | Professional & scientific | 2026 |
| A Plus GAS and Plumbing Ltd | Construction | 2025 |
| A Quarter of Sweets Limited | Wholesale & retail | 2024 |
| A R Brosgill Limited | Health & social care | 2008 |
| A R J Properties Limited | Real estate | 2016 |
| A Roch Professional Locum Ltd | Health & social care | 2014 |
| A Sharpe Plumbing & Heating Ltd | Construction | 2021 |
| A Sowray & Sons Limited | Agriculture & fishing | 2011 |
| A Star Lettings Ltd | Real estate | 2016 |
| A Team Marketing Ltd | Professional & scientific | 2012 |
| A V Matrix Ltd | Manufacturing | 2003 |
| A W Ashton Joinery Limited | Construction | 2003 |
| A Wharfe Block Management Limited | Households | 2026 |
| A&Lf Holdings Limited | Financial services | 2023 |
| A-Pex Construction (Yorkshire) Ltd | Construction | 2024 |
| A.& E.Baines Limited | Construction | 1951 |
| A.A. Toys Ltd | Professional & scientific | 2009 |
| A.D.P. Automotive Ltd | Wholesale & retail | 2007 |
| A.G.L. Accountancy Services Ltd | Professional & scientific | 2003 |
| A.H for Engineering Consultations Ltd | Professional & scientific | 2013 |
| A.I.M Decorating Ltd | Construction | 2016 |
| A.J. Bayliss Petroleum Engineers Ltd | Administrative & support | 2000 |
| A.L.S.O. Installations Ltd | Construction | 2024 |
| A.M. Handling Limited | Manufacturing | 1995 |
| A.Mcbride Ltd | Real estate | 2025 |
| A.N.Group Limited | Professional & scientific | 2015 |
| A.R. News Limited | Wholesale & retail | 1987 |
| A.S.E. Computer Services Ltd | Other services | 2003 |
| A1 Detailing Ltd | Wholesale & retail | 2019 |
| A10 Inspections Limited | Other services | 2014 |
| A1DEN Limited | Extraterritorial | 2020 |
| A1EX Ltd | Extraterritorial | 2016 |
| A3 General Trading Company Ltd | Extraterritorial | 2022 |
| AA Investments PVT Limited | Wholesale & retail | 2022 |
| AAA Mortgages Ltd | Financial services | 2005 |
| AAA Workwear Ltd | Other services | 2018 |
| Aaas Baraka Limited | Real estate | 2022 |
| Aaditya Limited | Wholesale & retail | 2009 |
| Aandw Consultants Ltd | Professional & scientific | 2019 |
| Aaop Ltd | Professional & scientific | 2023 |
| AAS Developments Limited | Real estate | 2016 |
| AB Contracting Solutions Ltd | Construction | 2019 |
| Abacus Direct Manufacturing Group Limited | Financial services | 2012 |
| Abacus Direct Properties Holdings Limited | Financial services | 2019 |
| Abacus Direct Properties Limited | Real estate | 2016 |
| Abbey Aerial Imaging Ltd | Professional & scientific | 2025 |
| Abbey Lodge (Harrogate) Management Limited | Households | 2001 |
| Abbey Wharfe (Selby) Management Company Limited | Real estate | 2005 |
| Abbeyfield (Ripon & District) Society Limited (the) | Hospitality | 1972 |
| Abbotscroft Holdings Limited | Construction | 1998 |
| Abdouverse Ltd | Wholesale & retail | 2025 |
| Abdulrahman Alswadi for Trading Ltd | Wholesale & retail | 2024 |
| Abecee Ltd | Administrative & support | 2026 |
| Abesque & Co Limited | Wholesale & retail | 2021 |
| ABF Europe Limited | Manufacturing | 2000 |
| ABG Design Limited | Manufacturing | 2011 |
| ABI Broadley Consulting Ltd | Professional & scientific | 2021 |
| Abingdon House Consulting Ltd | Administrative & support | 2022 |
| ABK Invest UK Ltd | Hospitality | 2021 |
| Abode Uk-Nz Ltd | Construction | 2017 |
| Abus Harrogate Ltd | Hospitality | 2025 |
| Abus Holding Ltd | Financial services | 2025 |
| AC Marketing & More Ltd | Professional & scientific | 2025 |
| Acad Holdings Limited | Financial services | 2006 |
| Acad Ltd | Financial services | 2018 |
| Academy Leisure Limited | Real estate | 1993 |
| Academy of Turnarounds Operations and Maintenance Limited | Professional & scientific | 2021 |
| Accelerated Lifestyle Ltd | Health & social care | 2015 |
| Access Park Management Company Limited | Real estate | 2016 |
| Access Retail Solutions Ltd | Hospitality | 2021 |
| Accomplish Limited | Professional & scientific | 2024 |
| Ace & Duke Ltd | Wholesale & retail | 2026 |
| Ace Elevators Limited | Manufacturing | 2009 |
| Ace Escalators (Northern) Limited | Other services | 2018 |
| Ace Escalators (Southern) Limited | Other services | 2018 |
| Ace Escalators Limited | Other services | 2018 |
| Ace SQ2 & Co Limited | Information & communication | 2023 |
| Ace Stairlifts (Northern) Limited | Other services | 2018 |
| Ace Stairlifts (Southern) Limited | Other services | 2018 |
| Ace Stairlifts Limited | Other services | 2018 |
| ACH Electrical Solutions Limited | Construction | 2022 |
| Achilles Heal Limited | Health & social care | 2003 |
| Ackerley & Associates Limited | Professional & scientific | 2006 |
| Acklams Beta Limited | Wholesale & retail | 2014 |
| Acorn Architecture Limited | Professional & scientific | 2025 |
| Acorn Wellness Limited | Arts & recreation | 2016 |
| Acorn World CIC | Arts & recreation | 2024 |
| Acorns in Harrogate Ltd | Health & social care | 2026 |
| Acorns Playgroup Limited | Education | 2010 |