| .S.V.S. Concepts Limited | Administrative & support | 2016 |
| 1M Property Ltd | Real estate | 2022 |
| 2P2C Project Ltd | Other services | 2026 |
| 3031 Properties Ltd | Real estate | 2025 |
| 4D Coils Limited | Manufacturing | 2015 |
| A & a NCL Ltd | Hospitality | 2019 |
| A & G Design Services Ltd | Professional & scientific | 2012 |
| A & G Marshall Optometrists Limited | Health & social care | 2008 |
| A C Podiatry Limited | Health & social care | 2024 |
| A M Hire Limited | Professional & scientific | 1992 |
| A Richards Associates Ltd | Administrative & support | 2025 |
| A Stylists Secret Ltd | Wholesale & retail | 2019 |
| A Waterson Limited | Other services | 2007 |
| A.Heads Holdings Ltd | Financial services | 2021 |
| A.N.F. Limited | Manufacturing | 1991 |
| A.W.S Medical UK Ltd | Health & social care | 2023 |
| A.Whitfield Holdings Ltd | Real estate | 2024 |
| A1 Plumbing and Heating Limited | Construction | 2002 |
| A2A Business Solutions Limited | Professional & scientific | 2019 |
| AAF Limited | Manufacturing | 1966 |
| ABE (North East) Limited | Real estate | 2025 |
| ABS Business Supplies Limited | Wholesale & retail | 2013 |
| Abseil Access Ltd | Construction | 2011 |
| Absolute Enablement Limited | Transport & logistics | 2018 |
| Absolute Group Consulting Ltd | Information & communication | 2011 |
| Access Coaching Ltd | Arts & recreation | 2021 |
| Ace Flooring (NE23) Ltd | Other services | 2021 |
| Ace Flooring Limited | Other services | 2026 |
| Action BPM Limited | Construction | 2009 |
| Action Enviro Maintenance Limited | Administrative & support | 2010 |
| Action Group North East Limited | Construction | 2009 |
| Action P & M Limited | Administrative & support | 2009 |
| Adiabatic Ltd | Transport & logistics | 2019 |
| Advanced Composites Engineering Limited | Manufacturing | 2020 |
| Advanced Packaging Materials Limited | Administrative & support | 1996 |
| Advancing Energy Ltd | Professional & scientific | 2022 |
| Aesthetic Moments Ltd | Other services | 2021 |
| Affinity Media Group Ltd | Information & communication | 2020 |
| Afsar Lettings Ltd | Real estate | 2021 |
| AG Multi-Cleaning Professional Services Ltd | Administrative & support | 2025 |
| Agera Services Limited | Construction | 2016 |
| Agrichemix Limited | Manufacturing | 2025 |
| Ah.Hvconsultancy Ltd. | Professional & scientific | 2020 |
| AHE Property Development Ltd | Real estate | 2021 |
| AI4GOOD Ltd | Information & communication | 2025 |
| Air Filters Limited | Manufacturing | 1998 |
| Airbox Ltd | Arts & recreation | 2023 |
| Aircare Air Conditioning Services Limited | Administrative & support | 2001 |
| Aircare Holdings Limited | Financial services | 2023 |
| AJ Precision Diagnostics Limited | Health & social care | 2026 |
| AJG Fabrications Ltd | Administrative & support | 2013 |
| Al-Shaheen Energy Services Limited | Professional & scientific | 2009 |
| Alan Hall Plumbing and Bathroom Services Ltd | Construction | 2022 |
| Albany Maintenance Limited | Households | 1971 |
| Aldobsonproperties Ltd | Real estate | 2026 |
| Alexander J Mcdougall Ltd | Professional & scientific | 2014 |
| Alfenry Holdings Limited | Financial services | 2016 |
| Algoverse Talent Solutions Limited | Administrative & support | 2025 |
| ALH Mechanical Services Ltd | Manufacturing | 2025 |
| Allan Wall Painting and Fencing Ltd | Construction | 2022 |
| Alliance Contracting Limited | Professional & scientific | 2024 |
| Almc Drilling Limited | Professional & scientific | 2007 |
| Alpha Pneumatics (UK) Limited | Transport & logistics | 1998 |
| Alpha Recovery Limited | Transport & logistics | 1995 |
| Alphabuild&Joinery Ltd | Construction | 2025 |
| Altogether Creative Ltd | Professional & scientific | 2016 |
| AM IT Solutions Ltd | Other services | 2023 |
| Amber Hawk Consultancy Limited | Wholesale & retail | 2024 |
| AMG Plumbing and Joinery Ltd | Households | 2026 |
| Amigos (NE) Ltd | Hospitality | 2022 |
| Amox Design Ltd | Professional & scientific | 2019 |
| Antep Shawarma Pizza Limited | Hospitality | 2022 |
| Antoinette's Gold Limited | Wholesale & retail | 2024 |
| APD Build Limited | Construction | 2015 |
| Apex Business Village (NO 2) Limited | Administrative & support | 2005 |
| Apex Business Village Management Company (NO 2) Limited | Administrative & support | 2026 |
| Applied Manufacturing and Engineering Solutions Ltd | Professional & scientific | 2023 |
| Aquapursuits Ltd | Education | 2011 |
| Aquashield ( S D ) Limited | Wholesale & retail | 2005 |
| Aquaspec Engineering Ltd | Construction | 2025 |
| Aquila Commerce Ltd | Wholesale & retail | 2025 |
| ARC Laser Cutting and Fabrication Ltd | Manufacturing | 2014 |
| Arcanologists Group Limited | Wholesale & retail | 2025 |
| Arcanologists Investments Limited | Wholesale & retail | 2025 |
| Archer Solomon Limited | Administrative & support | 2021 |
| Arcot Construction Ltd | Construction | 2026 |
| Arcot Engineering Company Limited | Manufacturing | 1986 |
| Arcot Grange Developments Limited | Construction | 2013 |
| Arcot Pine Ltd | Real estate | 2025 |
| Ardeema Solutions Limited | Information & communication | 2008 |
| Aries Courier Services Ltd | Transport & logistics | 2023 |
| Aries Estates Limited | Real estate | 2025 |
| ARK Signs Limited | Manufacturing | 2001 |
| Armans Food Ltd | Hospitality | 2025 |
| Arnotts CHP Ltd | Construction | 2018 |
| Artisan Glass Structures Limited | Construction | 2009 |
| AS Web Solutions Limited | Professional & scientific | 2020 |
| Asaad Pizza Ltd | Hospitality | 2025 |
| Ashwood Grounds Maintenance Limited | Administrative & support | 2018 |
| ASK E Commerce Ltd | Wholesale & retail | 2024 |