| 121 Healing Beauties Ltd | Health & social care | 2026 |
| 21 Degrees Limited | Construction | 2003 |
| 360 Digging Ltd | Construction | 2017 |
| 365 Expert Ltd | Information & communication | 2023 |
| A & P Birkenhead Properties Limited | Professional & scientific | 2003 |
| A & P Defence Limited | Professional & scientific | 2003 |
| A & P Falmouth Limited | Manufacturing | 1909 |
| A & P Ship Repairers Limited | Professional & scientific | 1995 |
| A & P Southampton Limited | Professional & scientific | 1985 |
| A & P Tees Limited | Manufacturing | 2003 |
| A & P Wallsend Limited | Professional & scientific | 2004 |
| A B Consultants (NE) Limited | Administrative & support | 2015 |
| A C Services North East Limited | Administrative & support | 2005 |
| A H Engineering (North East) Holdings Limited | Financial services | 2021 |
| A H Engineering (North East) Limited | Manufacturing | 1999 |
| A Story to Tell Ltd | Arts & recreation | 2025 |
| A&P GH 2006 Limited | Manufacturing | 2001 |
| A&P Group Limited | Manufacturing | 2006 |
| A&P Shipbuilders Limited | Professional & scientific | 2005 |
| A&P Tyne Limited | Manufacturing | 2004 |
| A1FENCING&LANDSCAPING Ltd | Administrative & support | 2025 |
| Abacus 196 Limited | Professional & scientific | 2005 |
| Abacus 460 Limited | Professional & scientific | 2004 |
| Abacus Accounting (N.E.) Limited | Professional & scientific | 2005 |
| Abacus Payroll Bureau Limited | Administrative & support | 2006 |
| Abacus Wealth Management Group Limited | Financial services | 2025 |
| Abacus Wealth Management Limited | Financial services | 2007 |
| Abbweld and Inspection Services Limited | Construction | 2014 |
| Absolute CRM Ventures Limited | Financial services | 2025 |
| AC3 Pharm Ltd | Wholesale & retail | 2025 |
| Ace Properties (NE) Limited | Real estate | 2006 |
| Acepizzauk Ltd | Hospitality | 2023 |
| Aclass Roofing North East Ltd | Construction | 2026 |
| ACT UK Group Ltd | Manufacturing | 2006 |
| Active Future Gateshead CIC | Arts & recreation | 2022 |
| Adobe Housing Limited | Real estate | 2024 |
| Adult Adhd & Autism Diagnostic Center Ltd | Health & social care | 2025 |
| Advanced Productivity Group Limited | Wholesale & retail | 2013 |
| Affordabell Access Limited | Professional & scientific | 2006 |
| AFL Engineering (N.E) Limited | Manufacturing | 1991 |
| AFL Engineering Holdings Limited | Financial services | 2021 |
| Agileeto Limited | Professional & scientific | 2015 |
| Agostina Limited | Real estate | 2023 |
| AH Road STONE1 Ltd | Construction | 2025 |
| AI Prestige Autos Ltd | Wholesale & retail | 2026 |
| Aidan Heywood Chiro Limited | Health & social care | 2025 |
| AJF Heddon Limited | Professional & scientific | 2021 |
| AJP Hebburn Ltd | Construction | 2018 |
| AJP Property Services Limited | Real estate | 2025 |
| AJS Power Systems Ltd | Construction | 2026 |
| AKA Compliance Limited | Professional & scientific | 2021 |
| Akagi Holdings Limited | Real estate | 2023 |
| AL RAI Properties Ltd | Real estate | 2024 |
| Alan Heron (Architectural Joinery and Cabinet Making) Limited | Manufacturing | 1999 |
| Alan Jeffers Ltd | Transport & logistics | 2026 |
| Alan Mitchell (Ingredients) Limited | Extraterritorial | 1985 |
| Albion KF Investments Ltd | Real estate | 2025 |
| ALL Project Planning Limited | Professional & scientific | 2024 |
| Allen 95 Limited | Wholesale & retail | 2016 |
| Allure Academy Group Ltd | Education | 2021 |
| Almar Family Support Limited | Health & social care | 2025 |
| ALR North Ltd | Professional & scientific | 2025 |
| AM (Ingredients) Limited | Wholesale & retail | 2008 |
| AM Digital Freedom Ltd | Information & communication | 2019 |
| Amac (NE) Ltd | Construction | 2024 |
| Amano Technologies Limited | Information & communication | 2008 |
| Amarian Holdings Ltd | Mining & quarrying | 2023 |
| AML Custom Ltd | Manufacturing | 2021 |
| Ammb Ltd | Financial services | 2024 |
| Andrew Hastie Plumbing Limited | Construction | 2006 |
| Antine Ltd | Real estate | 2021 |
| Apex Pharma Supplies Ltd | Wholesale & retail | 2024 |
| Apptituda Limited | Professional & scientific | 2016 |
| APT Digital Care Limited | Information & communication | 2025 |
| APX Market Trading Limited | Financial services | 2025 |
| ARC Financial Management Ltd | Financial services | 2021 |
| Asbestos Survey & Management Limited | Administrative & support | 2002 |
| Aspire and Acquire Ltd | Administrative & support | 2024 |
| Aspire Home's (Northeast) Ltd | Real estate | 2025 |
| Aspire Property & Maintenance Limited | Construction | 2025 |
| Atlantic & Peninsula Marine Services Limited | Manufacturing | 2011 |
| Aubrei Limited | Wholesale & retail | 2022 |
| AW Electrical & Construction Ltd | Construction | 2025 |
| Axien Limited | Professional & scientific | 2025 |
| Aylec Ltd | Construction | 2021 |
| Aztech (North East) Ltd | Information & communication | 2019 |
| Back Into Nature CIC | Education | 2021 |
| Balmoral Interiors Consultancy Limited | Professional & scientific | 2024 |
| Balmoral Interiors Limited | Wholesale & retail | 1989 |
| Bando Lash Limited | Other services | 2023 |
| Banks of the Tyne Motor Company Ltd | Wholesale & retail | 2022 |
| Barker-Brown Medical Aesthetics Ltd | Health & social care | 2026 |
| BBM Property Holdings Limited | Real estate | 2025 |
| BE. Unlimited Consulting & Coaching Ltd | Professional & scientific | 2020 |
| Beach Accountancy Limited | Professional & scientific | 2019 |
| Beach Accountants Limited | Administrative & support | 2012 |
| Beach Payroll Services Limited | Administrative & support | 2012 |
| Beamio Limited | Other services | 2025 |
| Bella Real Estate Ltd | Real estate | 2023 |
| Bijoux Brows Limited | Other services | 2017 |