| 113 KR Management Company Limited | Real estate | 2014 |
| 12 Alderson Road Management Company Limited | Households | 2017 |
| 14 Haywra Street Limited | Real estate | 2018 |
| 1416 Ltd | Manufacturing | 2025 |
| 144C Limited | Professional & scientific | 2023 |
| 16EIGHTY Ltd | Professional & scientific | 2020 |
| 1ST Choice Payroll Limited | Administrative & support | 2003 |
| 29 Old Steine (Brighton) Limited | Households | 2021 |
| 3 & 4 Rose Crescent Ltd | Real estate | 2023 |
| 3D Rooms Ltd | Construction | 2026 |
| 4 Haywra Street Limited | Real estate | 2018 |
| 40 Market Place South Management Limited | Households | 2021 |
| 95-97 Priest Lane Management Limited | Households | 2020 |
| A & J Ratcliffe Associates Ltd | Financial services | 2021 |
| A & L Walburn (Crop Spraying) Limited | Agriculture & fishing | 2012 |
| A & P Webster Ltd | Agriculture & fishing | 2011 |
| A Foster Properties Limited | Real estate | 2010 |
| A Kitching and Sons Ltd | Construction | 2014 |
| A R & C Booth and Sons Limited | Agriculture & fishing | 2025 |
| A Wilson Joinery Ltd | Construction | 2024 |
| A'N'B Taxis Ltd | Transport & logistics | 2015 |
| A.Bellaries Limited | Health & social care | 2012 |
| A.E. Duffield & Sons Limited | Construction | 1996 |
| A1 Dampproofing Solutions Ltd | Construction | 2015 |
| Aask Technologies Limited | Information & communication | 2026 |
| Abacus 155 Limited | Professional & scientific | 2006 |
| Abacus Design & Draughting Services Limited | Professional & scientific | 1995 |
| Abbey Park Flat Management Company Limited | Households | 1981 |
| Abbey Windows Systems Limited | Real estate | 2002 |
| Abbeyseven Limited | | 1983 |
| Abbott Construction (Northern) Limited | Construction | 2009 |
| ABC 2012 Limited | Extraterritorial | 2012 |
| Abel Farms Ltd | Agriculture & fishing | 2012 |
| Absolute Gardens (Construction) Limited | Administrative & support | 2015 |
| Absolute Gardens Maintenance Ltd | Administrative & support | 2019 |
| Absuppliers Ltd | Wholesale & retail | 2020 |
| Acbdjb Ltd | Administrative & support | 2018 |
| Access Technology North Ltd | Information & communication | 2017 |
| Accountants With a Difference Ltd | Professional & scientific | 2005 |
| Accountcoads Limited | Administrative & support | 1996 |
| Acoustic Solutions Yorkshire Limited | Arts & recreation | 2016 |
| Actuality Ltd | Agriculture & fishing | 2024 |
| Adamson's Turf Machinery Limited | Extraterritorial | 1949 |
| Additive - X Limited | Manufacturing | 1988 |
| Adsportuk Limited | Arts & recreation | 2026 |
| Adsum Management Co. Limited | Real estate | 1990 |
| Adverse Camber Inns Ltd | Hospitality | 2021 |
| Aeht Group Holdings Limited | Financial services | 2024 |
| Aeht Limited | Real estate | 2024 |
| AG European Holdings LLP | | 2015 |
| AIM Higher Mortgages & Protection Ltd | Financial services | 2026 |
| Ainderby BNG Management Limited | Real estate | 2025 |
| Air - Tech (Yorkshire) Limited | Construction | 2010 |
| AJ Fruit & Flowers Limited | Hospitality | 2017 |
| Akkeri Developments (Kilham) Limited | Construction | 2021 |
| Akkeri Developments Limited | Construction | 2020 |
| Alan Sedman Motors Limited | Wholesale & retail | 2024 |
| Alcfam | Financial services | 2025 |
| Alex Hayward Transport Ltd | Transport & logistics | 2024 |
| Alice Clarke Jewellery Ltd | Wholesale & retail | 2024 |
| ALL OUT Heating & Plumbing Limited | Construction | 2022 |
| ALL the Rage ( Dalton ) Ltd | Wholesale & retail | 2025 |
| ALL Things Hired Limited | Administrative & support | 2024 |
| Allerton Properties Limited | Construction | 2007 |
| Allton Contractors Limited | Extraterritorial | 1937 |
| Allton Engineering Limited | Extraterritorial | 1935 |
| Almas Training Ltd | Administrative & support | 2018 |
| Alpaca Agriculture Ltd | Construction | 2024 |
| Alpha Home Design Ltd | Manufacturing | 2019 |
| Alun Rees Learning Limited | Professional & scientific | 2014 |
| ALX Cleanse Limited | Administrative & support | 2017 |
| Ambridge Ceramics Limited | Manufacturing | 2001 |
| AMS Planning and Architecture Limited | Professional & scientific | 2016 |
| AMS Planning Limited | Professional & scientific | 2020 |
| Andrew Foster Investments Limited | Real estate | 2018 |
| Angitia Limited | Education | 2020 |
| Angram Livestock Limited | Agriculture & fishing | 2019 |
| Anisha Ltd | Health & social care | 2020 |
| Anthropocene Consulting Insights Limited | Professional & scientific | 2025 |
| Antique Surgery Limited | Education | 2014 |
| Aotra Limited | Professional & scientific | 2003 |
| APB Dist Ltd. | Wholesale & retail | 2016 |
| Apex Developments (Ripon) Ltd | Construction | 2018 |
| Apex Homes (Ripon) Limited | Construction | 2019 |
| Apex Salons Ripon Limited | Other services | 2020 |
| Apexxepa Ltd | Financial services | 2019 |
| APG Computers Limited | Information & communication | 2011 |
| Apollo Dataworks Ltd | Information & communication | 2025 |
| Appletrees Day Nursery Ltd | Education | 2008 |
| Appmet Ltd | Financial services | 2016 |
| Appreciated Coachwork Limited | Wholesale & retail | 2016 |
| Aquarius Hire Holdings Limited | Other services | 2022 |
| Aquarius Rail Holdings Limited | Other services | 2019 |
| Aquarius Rail Ltd | Manufacturing | 2020 |
| Aquarius Railroad Technologies Limited | Manufacturing | 1999 |
| Aquarius Roadrail Technologies Limited | Administrative & support | 2021 |
| Arbare Properties Ltd | Real estate | 2025 |
| Arcadia Contracts Ltd | Construction | 2024 |
| Arcadia Property Preservation Ltd | Construction | 2023 |
| Around the Clock Glazing (York) Limited | Construction | 2003 |