| 1 Air Assist Ltd | Health & social care | 2022 |
| 108 Stockwell Road (Residents Association) Limited | Real estate | 2006 |
| 123 Bathrooms Ltd | Construction | 2022 |
| 1919 Electrical Limited | Construction | 2025 |
| 1ST Safari Day Nurseries Limited | Education | 2005 |
| 2J Properties Limited | Real estate | 2017 |
| 340R Electrical Services Ltd | Professional & scientific | 2026 |
| 3566 Leisure Limited | Hospitality | 2018 |
| 360 Contracting Services Ltd | Administrative & support | 2022 |
| 4 Leaders Limited | Administrative & support | 2007 |
| 4 Packaging Solutions Limited | Manufacturing | 2004 |
| 4 Weeks Limited | Administrative & support | 2008 |
| 666 Engineering Limited | Construction | 2014 |
| 99 Octane Ltd | Wholesale & retail | 2026 |
| 996 Services Ltd | Professional & scientific | 2026 |
| A & M Falkingham Limited | Construction | 2011 |
| A & N Computer Consultants Limited | Information & communication | 1997 |
| A Jackson Developments UK Ltd | Professional & scientific | 2021 |
| A Poskitt Transport Ltd | Transport & logistics | 2017 |
| A S Utilities UK Limited | Professional & scientific | 2017 |
| A Wilson Building Services Ltd | Construction | 2026 |
| A&A DEL Ltd | Transport & logistics | 2020 |
| A&J Nails Selby Limited | Other services | 2020 |
| A. S. Electrical Services (York) Limited | Construction | 2016 |
| A.S Aggregate Ltd | Construction | 2023 |
| A1 Contractors Ltd | Construction | 2026 |
| AAA Integrations PVT Ltd | Wholesale & retail | 2023 |
| AAI (Selby) Limited | Professional & scientific | 2009 |
| AB Pacey Limited | Real estate | 2026 |
| Abacus Accountancy Service & Systems Ltd | Professional & scientific | 2010 |
| Abbey Administration Ltd | Administrative & support | 2024 |
| Abbey Catering Design Ltd | Professional & scientific | 2026 |
| Abbey Dental Care Limited | Health & social care | 2018 |
| Abbey Leisure Enterprises Ltd | Wholesale & retail | 2026 |
| Abbey Personnel Services Limited | Administrative & support | 1999 |
| ABC Consulatant Limited | Administrative & support | 2016 |
| Abergelli Power Limited | Administrative & support | 2012 |
| Abscaff (Selby) Limited | Construction | 2011 |
| Acaster Fitness Ltd | Arts & recreation | 2022 |
| Acaster Gymnastics Ltd | Arts & recreation | 2022 |
| Accasnap Ltd | Arts & recreation | 2026 |
| Access Experiences Ltd | Information & communication | 2022 |
| Access Vision Ltd | Administrative & support | 2025 |
| Accounts AI Limited | Information & communication | 2023 |
| Ace of Pentacles Ltd | Wholesale & retail | 2025 |
| Acer Garden Maintenance Ltd | Administrative & support | 2020 |
| Acer Landscaping Services Ltd | Administrative & support | 2019 |
| Achieve Music Excellence Ltd | Education | 2025 |
| Acorn Festive Lights Limited | Construction | 2018 |
| Acorn Joinery & Construction Limited | Construction | 2012 |
| Acorn Lighting Services Limited | Construction | 1999 |
| Acting Magic Limited | Arts & recreation | 2012 |
| Active Cosmetic Ingredients Ltd | Manufacturing | 2011 |
| ACW Plumbing and Heating Ltd | Construction | 2025 |
| AD Restaurants Ltd | Hospitality | 2023 |
| Adams Nursery Ltd | Administrative & support | 2015 |
| Adapt Building and Construction Ltd | Construction | 2025 |
| Addauto Limited | Wholesale & retail | 2023 |
| Adealsdirect Limited | Real estate | 2025 |
| Adina Developments Ltd | Construction | 2015 |
| ADJ Management Ltd | Arts & recreation | 2026 |
| Admiral Projects (Construction) Ltd | Construction | 2015 |
| Adrianvass Limited | Transport & logistics | 2022 |
| Adtr & Company Ltd | Wholesale & retail | 2023 |
| Adult Healthcare Selby Ltd | Health & social care | 2016 |
| Advanced Clinical Care Limited | Health & social care | 2023 |
| Advanced Logistics Recruitment Limited | Households | 2014 |
| Advantage Safety Ltd | Construction | 2014 |
| Advent Technologies Limited | Manufacturing | 2006 |
| Aeec Limited | Wholesale & retail | 2023 |
| AES Drax Acquisition Limited | Professional & scientific | 1999 |
| Aeternum YOU Ltd | Other services | 2020 |
| AF Electrical Ltd | Construction | 2018 |
| Affinity Care Solutions Ltd | Health & social care | 2023 |
| After Ruby Ltd | Professional & scientific | 2022 |
| Agora Property Management Limited | Real estate | 2024 |
| Agrifit Machinery Limited | Wholesale & retail | 2009 |
| Agriscape Engineering Ltd | Water & waste | 2015 |
| Agritec Fabrications Ltd | Manufacturing | 2024 |
| Aimc Ltd | Education | 2023 |
| AJ Property (Selby) Ltd | Real estate | 2025 |
| AJF Trading Ltd | Wholesale & retail | 2026 |
| Alert Logistics Limited | Transport & logistics | 2010 |
| Alexia & Rebeca Ltd | Transport & logistics | 2017 |
| Alexia & Rebecca Ltd | Transport & logistics | 2024 |
| ALI Barber (Selby) Limited | Other services | 2023 |
| ALL Aspects Garden Maintenance Limited | Administrative & support | 2009 |
| ALL Lanes Included Limited | Professional & scientific | 2018 |
| ALL Seasons (York) Limited | Administrative & support | 2019 |
| ALL Things Magical Ltd | Wholesale & retail | 2021 |
| ALL Year Round the Flower Patch CIC | Other services | 2021 |
| Almara Express Ltd | Transport & logistics | 2025 |
| ALO Pizza Ltd | Hospitality | 2019 |
| Alpha Engineering (Selby) Limited | Professional & scientific | 2013 |
| Alpin Holdings Limited | Financial services | 2026 |
| ALS Trade Cars Ltd | Wholesale & retail | 2021 |
| Altia Estates (Nott) Limited | Wholesale & retail | 2022 |
| Altia Estates Ltd | Real estate | 2019 |
| Altia Limited | Extraterritorial | 2018 |
| Altura Property Management Limited | Real estate | 2026 |