| 00978939 Limited | | 1970 |
| 0191 TAN Ltd | Other services | 2024 |
| 356 Admin and Proofreading Limited | Administrative & support | 2024 |
| 4429 Limited | Financial services | 2026 |
| 4K International Ltd | Financial services | 2023 |
| 55 Block Holdings Limited | Financial services | 2025 |
| 55 Management Services Ltd | Real estate | 2026 |
| 57SPORTS Ltd | Education | 2025 |
| 615 Scaffolding Limited | Construction | 2024 |
| A & P Builders (Newcastle) Limited | Construction | 2021 |
| A & P Rentals Limited | Real estate | 2017 |
| A Dugdale Rigging Solutions Ltd | Manufacturing | 2019 |
| A J M Painters & Decorators Ltd | Construction | 2015 |
| A Johnson Building Services Ltd | Construction | 2026 |
| A Radich Limited | Manufacturing | 2017 |
| A-Star Lodges Ltd | Hospitality | 2017 |
| A-Star Properties (NE) Ltd | Real estate | 2019 |
| A. & J. Keith Limited | Construction | 1988 |
| A. Allsopp Marketing Ltd | Information & communication | 2022 |
| A. Smith Builder and Decorator Limited | Construction | 2005 |
| A.W Engineering Consultancy Ltd | Professional & scientific | 2024 |
| AAA Property Trading Ltd | Real estate | 2021 |
| AB Joinery NE Ltd | Construction | 2019 |
| Abacus 164 Limited | Professional & scientific | 2006 |
| Acas Bathrooms Ltd | Construction | 2017 |
| Acas Pumps Ltd | Water & waste | 2026 |
| Access Driven Solutions Ltd | Construction | 2020 |
| ACD Developments ( N.E.) Limited | Real estate | 2016 |
| Ace Joinery Holdings Limited | Manufacturing | 2013 |
| Ace of Fades Limited | Other services | 2025 |
| Acorn & Oak Play Cafe Limited | Hospitality | 2021 |
| Active Recruitment North East Ltd | Administrative & support | 2016 |
| Active Residential North East Ltd | Real estate | 2015 |
| Activict Limited | Hospitality | 2011 |
| Actt Digital Ltd | Information & communication | 2026 |
| Adara Property Bolsover Ltd | Construction | 2025 |
| Adara Property Ltd | Construction | 2024 |
| Adara Trading Ltd | Real estate | 2022 |
| Adavo (Town Hall) Limited | Real estate | 2021 |
| Adavo Ltd | Real estate | 2014 |
| Addon Distribution Group Ltd | Wholesale & retail | 2024 |
| Adhd Wellbeing Focus Ltd | Health & social care | 2025 |
| Adilifting Ltd | Mining & quarrying | 2019 |
| ADP Lancaster Ltd | Education | 2023 |
| ADS Air CON Limited | Construction | 2013 |
| Advanced Wallsend Test Centre Ltd | Other services | 2014 |
| Advent Letting Ltd | Real estate | 2019 |
| Aedt Operations Limited | Real estate | 2013 |
| AFC Cargo Ltd | Wholesale & retail | 2024 |
| Africa Eats Digital Ltd | Information & communication | 2026 |
| Africawad Recycling Community Interest Company | Water & waste | 2015 |
| AGE Less Aesthetics Ltd | Other services | 2015 |
| Agon Newcastle Limited | Arts & recreation | 2023 |
| Agricola Projects Ltd | Wholesale & retail | 2025 |
| Agro Pro-Recruitment Limited | Administrative & support | 2021 |
| AHW Renovations & Property Maintenance Ltd | Construction | 2024 |
| Aiba Commercial Properties Limited | Real estate | 2024 |
| AIZ Ltd | Hospitality | 2026 |
| AJ Wind Ltd | Energy | 2024 |
| Ajasa & Co Limited | Administrative & support | 2022 |
| AJS Joinery NE Ltd | Construction | 2021 |
| AJS Trade Interiors Ltd | Manufacturing | 2025 |
| Akbar AL Tijarah Ltd | Wholesale & retail | 2025 |
| Akdeniz Chemson Additives Ltd | Manufacturing | 1986 |
| Akosman Property Management Limited | Real estate | 2020 |
| Alan Gray and Sons Accountants Ltd | Professional & scientific | 2011 |
| Alan Keith - J M R Electrical Contractors Ltd | Construction | 2006 |
| Alan Keith Properties Ltd | Real estate | 2015 |
| Alevere Nutrition Limited | Wholesale & retail | 2023 |
| Alexander Millar Fine Art Ltd | Arts & recreation | 2016 |
| Alexandra Roofing Ltd | Construction | 2014 |
| Alfe Engineering Ltd | Professional & scientific | 2021 |
| Algeka Limited | Other services | 2015 |
| ALJ NE Solutions Ltd | Mining & quarrying | 2022 |
| ALL FUR Coat Limited | Hospitality | 2019 |
| Alla Takeaway Ltd | Hospitality | 2025 |
| Allblack Property Management Limited | Real estate | 2018 |
| Allfix Newcastle Limited | Real estate | 2018 |
| Alloy Wheel Repairs Limited | Professional & scientific | 2010 |
| Alpha Omega Property Investments Group Ltd | Financial services | 2026 |
| Alturas Engineering Ltd | Professional & scientific | 2025 |
| AM PM Property and Investments Ltd | Real estate | 2026 |
| Amccad Ltd | Professional & scientific | 2021 |
| Amcracing Ltd | Arts & recreation | 2026 |
| Amea Limited | Construction | 2016 |
| American Candy & Vape Shop Ltd | Wholesale & retail | 2026 |
| Anderson Guitar Tuition Ltd | Education | 2025 |
| ANDO150 Limited | Professional & scientific | 2016 |
| Anth's Access Limited | Administrative & support | 2018 |
| Anthill Homes Ltd | Real estate | 2024 |
| Antonio Smart Cleaning Ltd | Administrative & support | 2024 |
| AP Joinery (NE) Ltd | Construction | 2025 |
| APB (NE) Ltd | Transport & logistics | 2023 |
| Apoccas Limited | Wholesale & retail | 2012 |
| Apparo Limited | Construction | 2001 |
| Ario Fish & Chips Ltd | Hospitality | 2017 |
| Ariyas Supermarket Limited | Wholesale & retail | 2025 |
| ARK (N.East) Limited | Hospitality | 2018 |
| Arm-Ski Engineering Ltd | Manufacturing | 2025 |
| Armour DS Ltd | Manufacturing | 2017 |