| 14 Stanley Street Limited | Wholesale & retail | 2021 |
| 1892MEDIA Limited | Information & communication | 2018 |
| 1ST Step Pre-School Ltd | Health & social care | 2022 |
| 2PAFOOD Ltd | Hospitality | 2019 |
| 37-43 Horton Park RTM Company Limited | Households | 2025 |
| 3PLWOW Ltd | Administrative & support | 2016 |
| 7DA Limited | Agriculture & fishing | 2005 |
| A & R Plant Hire Limited | Administrative & support | 2024 |
| A H Mechanical Services Ltd | Professional & scientific | 2025 |
| A Helping Hand Social Care Ltd | Professional & scientific | 2023 |
| A Place for Everyone CIC | Information & communication | 2026 |
| A Reed Holdings Ltd | Other services | 2022 |
| A S Seaside Stores Ltd | Wholesale & retail | 2024 |
| A Weeby Wonderland Limited | Wholesale & retail | 2023 |
| A-Z Machining Ltd | Manufacturing | 2022 |
| AA Deck Operations Offshore Limited | Construction | 2018 |
| AB Investment Group Holdings Limited | Real estate | 2025 |
| Acoreenergy Limited | Professional & scientific | 2012 |
| Adbeck Ltd | Extraterritorial | 2016 |
| Adorn Aesthetics Ltd | Health & social care | 2020 |
| Advanced Barrier Coatings Limited | Professional & scientific | 2015 |
| Aesthetics by Lisa Ltd | Other services | 2024 |
| Afriball CIC | Administrative & support | 2026 |
| After Eighty Ltd | Wholesale & retail | 2026 |
| AGW Mechanical Services Limited | Mining & quarrying | 2023 |
| AH IT Services Limited | Information & communication | 2016 |
| AIM 4 Currys Ltd | Hospitality | 2023 |
| Aimrange (North East) Limited | Water & waste | 1984 |
| Ajax Resource TM Ltd | Public administration | 2023 |
| AJB Legal Limited | Professional & scientific | 2011 |
| Akira Constructions Ltd | Construction | 2021 |
| Alberg Tech Ltd | Professional & scientific | 2023 |
| Albion Investments (North East) Limited | Transport & logistics | 1999 |
| Alfred Ernest Estates Ltd | Real estate | 2019 |
| Allgood Consultancy Limited | Other services | 2015 |
| Allsea Energy Ltd | Professional & scientific | 2024 |
| Alpco Consulting Ltd | Professional & scientific | 2025 |
| Altitude Sports Tours Ltd | Administrative & support | 2024 |
| AMC Sports Ltd | Wholesale & retail | 2008 |
| AMI Private Hire Limited | Administrative & support | 2025 |
| Amrb Limited | Hospitality | 2026 |
| Ananthi Properties UK Ltd | Real estate | 2024 |
| Andree King Limited | Professional & scientific | 2012 |
| Angel Are-Fits Limited | Construction | 2026 |
| Angus Welding & Fabrication Ltd. | Manufacturing | 2020 |
| Animus Sales Group Ltd | Professional & scientific | 2025 |
| Antalya Barbers Blyth Ltd | Other services | 2024 |
| Ants Road Haulage Services Limited | Transport & logistics | 2020 |
| Apexx Styling Ltd | Wholesale & retail | 2025 |
| App Lettings Limited | Real estate | 2020 |
| AR Barbering Ltd | Other services | 2018 |
| ARA Fusion Limited | Hospitality | 2025 |
| ARA Indian Limited | Hospitality | 2025 |
| ARD Autotech Ltd | Wholesale & retail | 2026 |
| Argentelle Ltd | Wholesale & retail | 2025 |
| ARK Muir Ltd | Administrative & support | 2022 |
| Armour & Madderson Heating Services Limited | Real estate | 1972 |
| Armstrong Aerial Access Limited | Extraterritorial | 2014 |
| Art of Stone Memorials Limited | Construction | 2014 |
| Art of Stone(Ne) Limited | Construction | 2023 |
| Arthur Brown (Blyth) Limited | | 1958 |
| AS Properties (Blyth) Ltd | Real estate | 2024 |
| Asgard Property Developers Ltd | Construction | 2025 |
| Ashanti Royale Mart Ltd | Wholesale & retail | 2026 |
| Ashwood Building & Civil Engineering Limited | Construction | 2005 |
| ASR Property Holdings (Blyth) Ltd | Real estate | 2021 |
| AT Palm Pilates Ltd | Arts & recreation | 2025 |
| AT QS Services Ltd | Professional & scientific | 2026 |
| AT the Aces Ltd | Extraterritorial | 2025 |
| Aura Sportswear Ltd | Wholesale & retail | 2024 |
| Aureum Property Management Ltd | Real estate | 2025 |
| Auto Perfrormance Parts Ltd | Wholesale & retail | 2025 |
| Avenue North Digital Ltd | Professional & scientific | 2023 |
| Avor (Holdings) Limited | Administrative & support | 2008 |
| Avor Garages (North East) Limited | Wholesale & retail | 1974 |
| Awesome Escapes Ltd | Administrative & support | 2025 |
| AWO Igugu Ltd | Wholesale & retail | 2025 |
| Aztec Construction NE Limited | Construction | 2025 |
| B.O.C Manufacturing Limited | Extraterritorial | 2021 |
| Bach Investments Limited | Real estate | 2020 |
| Backoffice Business Partners Ltd | Professional & scientific | 2025 |
| BAD Goods Limited | Hospitality | 2025 |
| Baku Civil Engineering Limited | Construction | 2025 |
| Bamburgh Research Project Limited | Professional & scientific | 2015 |
| Bark & Bones Photography Ltd | Professional & scientific | 2024 |
| Barlson Limited | Professional & scientific | 2026 |
| Barnesbury Cycling Club | Administrative & support | 2019 |
| Barrie LOW Ltd | Transport & logistics | 2025 |
| Bastion Coffee Ltd | Manufacturing | 2023 |
| Bathroom Buddies Limited | Construction | 2020 |
| Batty Dimples Catering Ltd | Hospitality | 2014 |
| Bay Electrical Services Limited | Construction | 2005 |
| Bay Food Ltd | Hospitality | 2026 |
| Bayliss Property Services Limited | Real estate | 2024 |
| Beau Monde Events Ltd | Hospitality | 2018 |
| Beauty @ the Inn (Newcastle) Limited | Health & social care | 2014 |
| Bedlington Bangers Ltd | Wholesale & retail | 2026 |
| Beebox Systems Ltd | Information & communication | 2014 |
| Behavioural Measures UK Limited | Professional & scientific | 2009 |
| Bell & Harwood Property Investments Limited | Real estate | 2006 |