| &Move Agents Ltd | Real estate | 2021 |
| 07703792444GAZ Ltd | Wholesale & retail | 2015 |
| 1508 Property Ltd | Real estate | 2026 |
| 161 Withington Road RTM Company Limited | Households | 2023 |
| 1ST Practice Holdings Limited | Financial services | 2023 |
| 1ST Wheels Car Sales Limited | Wholesale & retail | 2024 |
| 1ST Wheels Garage Ltd | Professional & scientific | 2025 |
| 21ST Century Bars Ltd | Hospitality | 2021 |
| 221 AWW Limited | Real estate | 2023 |
| 27 New Walk Management Company Limited | Extraterritorial | 2013 |
| 340 Ltd | Real estate | 2013 |
| 4 Seasons (Hull) Ltd | Administrative & support | 1998 |
| 666 Leisure Holdings Limited | Financial services | 2024 |
| 666 Lilith Limited | Financial services | 2024 |
| 666 LOW Holdings Limited | Financial services | 2019 |
| 666 LOW Investments Limited | Real estate | 2019 |
| 666 Richmond Group Limited | Financial services | 2024 |
| 70FIVE Quantity Surveying Limited | Professional & scientific | 2011 |
| 92A Coltman Street Management Company Limited | Real estate | 1986 |
| A & C Plumbing and Mechanical Services Ltd | Construction | 2026 |
| A & K Windows Limited | Construction | 2005 |
| A & M Land Development Limited | Construction | 2025 |
| A & S (Sport Horses) Limited | Arts & recreation | 2006 |
| A & S Properties (Bridlington) Ltd | Real estate | 2015 |
| A and S R Roberts Ltd | Real estate | 2026 |
| A Bickerstaffe Ltd | Professional & scientific | 2023 |
| A Boulton & Sons Limited | Other services | 2003 |
| A C Agricultural Solutions Ltd | Manufacturing | 2022 |
| A Furniss GAS Services Ltd | Construction | 2010 |
| A J B Energy Ltd | Manufacturing | 2026 |
| A J Oliver Ltd | Manufacturing | 2002 |
| A J W Consulting Limited | Information & communication | 1999 |
| A Mindful Solution CIC | Health & social care | 2024 |
| A P Electrical (Hull) Limited | Professional & scientific | 2003 |
| A P Electronic Services Limited | Manufacturing | 1997 |
| A Star Training Solutions Ltd | Professional & scientific | 2010 |
| A Syed & Co Limited | Professional & scientific | 1997 |
| A, J Langley Limited | Administrative & support | 2009 |
| A-Tec Services (Humber) Limited | Manufacturing | 2015 |
| A. Hugh Walker (Leeds) Limited | Wholesale & retail | 1938 |
| A.O. Papuc Ltd | Transport & logistics | 2018 |
| A1 Hosetek Ltd | Other services | 2008 |
| A2Z Interactive Ltd | Information & communication | 2014 |
| AAA @ MMB Landscapes Ltd | Administrative & support | 2014 |
| AAA Groundworks and Construction Ltd | Construction | 2014 |
| Aaom Ltd | Real estate | 2016 |
| Abaya Manufacturers Co Limited | Wholesale & retail | 2026 |
| Abbeydale Croft Management Company Limited | Households | 2005 |
| Abbyo's Artisan Gelato Limited | Manufacturing | 2024 |
| ABI Bidco Limited | Professional & scientific | 2016 |
| ABI Midco Limited | Professional & scientific | 2016 |
| Abilite Limited | Education | 2022 |
| Abode Marketing Limited | Professional & scientific | 2018 |
| ABR Assets Ltd | Administrative & support | 2013 |
| ABR Pet Supplies Ltd | Wholesale & retail | 2018 |
| Abraham International Medical Services Limited | Health & social care | 2011 |
| Absolute Play Ltd | Other services | 2022 |
| Abt-Cad Services Limited | Information & communication | 2015 |
| Acce DRY Cleaners Limited | Administrative & support | 2025 |
| Accuweigh Ltd | Wholesale & retail | 2014 |
| Ace Scaffolding (Yorkshire) Ltd | Construction | 2012 |
| Ace Sport Racing Ltd | Arts & recreation | 2022 |
| Acey Properties Limited | Real estate | 2023 |
| Acklam Court Beverley RTM Company Limited | Households | 2015 |
| Acklam's Coaches Limited | Transport & logistics | 2007 |
| Acklams Leisure Limited | Transport & logistics | 2016 |
| Acklams Properties Limited | Real estate | 2007 |
| Acomb Engineering Holdings Limited | Financial services | 2026 |
| Across Time Films Limited | Information & communication | 2025 |
| Actilia Limited | Professional & scientific | 2013 |
| Actiongold Limited | Real estate | 2004 |
| Active Cyber Resilience Ltd | Information & communication | 2024 |
| Acumex Machining Group Ltd | Manufacturing | 2025 |
| AD Comms Services Ltd | Information & communication | 2025 |
| AD Feather Limited | Hospitality | 2017 |
| Adam Builders Ltd | Construction | 2016 |
| Adam Weisbaum Osteopathy Limited | Health & social care | 2014 |
| Adams Tyre Specialists Limited | Wholesale & retail | 2017 |
| ADD HR Solutions Limited | Administrative & support | 2012 |
| Adding Oxygen Limited | Administrative & support | 2012 |
| Addison Contract Services Ltd | Professional & scientific | 2023 |
| Addplant Group Limited | Financial services | 2023 |
| Addrss Ltd | Information & communication | 2024 |
| Adept Piping Ltd | Professional & scientific | 2012 |
| Adlai Limited | Information & communication | 2023 |
| Adlib Finance Limited | Financial services | 2011 |
| Adrian Smith Rating Limited | Financial services | 2010 |
| ADT Pubs Ltd | Hospitality | 2016 |
| Advance Electrics Limited | Construction | 2026 |
| Advance Water Training Ltd | Education | 2024 |
| Advanced Vehicle Services Ltd | Wholesale & retail | 2025 |
| Advantage Driver Performance Limited | Other services | 2025 |
| Advantage Sports Coaching Ltd | Arts & recreation | 2012 |
| Aesthetics by Jodie Wilson Limited | Other services | 2023 |
| Aesthetics by Lynette Ltd | Hospitality | 2023 |
| Aflex Cables Limited | Wholesale & retail | 2001 |
| Africa Lands Trust | Other services | 1997 |
| Agercon Limited | Real estate | 1972 |
| Agml (UK) Limited | Construction | 2016 |
| Agnes Healthcare Group Limited | Financial services | 2025 |