| 101 Life Ltd | Health & social care | 2023 |
| 138 Designs Limited | Professional & scientific | 2015 |
| 18 Estates Group Ltd | Real estate | 2025 |
| 1STEP Trading Limited | Hospitality | 2014 |
| 2 Lighthouse View Holdings Limited | Real estate | 2025 |
| 42 - 47 Highgate Management Company Limited | Real estate | 2005 |
| 7 Belle VUE Crescent, Sunderland Management Co. Ltd | Households | 2006 |
| 9 Media Production Ltd | Information & communication | 2024 |
| A & G Plumbing (Tyne & Wear) Limited | Construction | 2001 |
| A Dawson Groundwork Services Limited | Construction | 2016 |
| A G M Plumbing and Heating Services Ltd | Construction | 2017 |
| A&Hbrickwork Ltd | Construction | 2024 |
| A.S. Professional Ltd | Information & communication | 2023 |
| A1 Fishery Ltd | Hospitality | 2025 |
| Absolute Home Improvements East Durham Limited | Construction | 2026 |
| Accelerated Media UK Limited | Other services | 2023 |
| Ace Learning and Support Limited | Health & social care | 2025 |
| ACT Industrial Cleaning Specialists Ltd | Administrative & support | 2016 |
| ACT Industrial Support Services Ltd | Administrative & support | 2024 |
| AD Cleaning Services Ltd | Administrative & support | 2024 |
| Advanced Building Technology (N E) Ltd | Energy | 2006 |
| Aels Ltd | Other services | 2005 |
| Aesthetics NOW Academy Ltd | Other services | 2024 |
| AESTHETICS21 Limited | Health & social care | 2017 |
| AFC Business Solutions Ltd | Administrative & support | 2023 |
| Afro-Naija Supermart Ltd | Wholesale & retail | 2024 |
| AG Courier Transport Ltd | Transport & logistics | 2025 |
| AGJ Accounting Ltd | Professional & scientific | 2016 |
| Aires Liquids Limited | Wholesale & retail | 2025 |
| AJ Property Solutions Ltd | Real estate | 2002 |
| Al's Catering Services Limited | Hospitality | 2018 |
| Alderclad 2025 Ltd | Financial services | 2024 |
| Ali’S Babas Limited | Wholesale & retail | 2012 |
| Ali’S Property Group Limited | Real estate | 2023 |
| ALL the Right Movies Limited | Arts & recreation | 2019 |
| ALL Things Clean Ltd | Administrative & support | 2021 |
| ALM & ALM Ltd | Financial services | 2025 |
| Alyssa Fashions Limited | Manufacturing | 2025 |
| Amtal Flore Aesthetics Ltd | Other services | 2025 |
| Andark Play Ltd | Hospitality | 2023 |
| Andark Rentals Limited | Hospitality | 2021 |
| Andark Roker Ltd | Hospitality | 2026 |
| Andark Slice Ltd | Hospitality | 2023 |
| Andark Vaux Ltd | Hospitality | 2022 |
| Andark Ventures Ltd | Hospitality | 2018 |
| Andrew Martin Wright Limited | Professional & scientific | 2023 |
| Angus Foods Limited | Wholesale & retail | 2007 |
| Ankers Services Ltd | Construction | 2023 |
| Appleby Investment Ltd | Real estate | 2026 |
| Appleby Investors Limited | Real estate | 2025 |
| Aquatherm Drilling Ltd | Construction | 2025 |
| Arbor Division Group Ltd | Financial services | 2025 |
| Arbor Division Ltd | Agriculture & fishing | 2006 |
| ARC Subsea Intl Limited | Professional & scientific | 2020 |
| Archer Research Limited | Professional & scientific | 2019 |
| ARR Recruitment Ltd | Administrative & support | 2019 |
| ASG Tech Ltd | Real estate | 2019 |
| Ashoka Indian Restaurant Limited | Hospitality | 2016 |
| Assisted Recovery Training Limited | Administrative & support | 2024 |
| Aston Lord Management and Consultancy Ltd | Professional & scientific | 2024 |
| Aston Lord Properties Ltd | Real estate | 2024 |
| Aston Lord Staffing Solutions Ltd | Administrative & support | 2021 |
| ATD Fitness Ltd | Arts & recreation | 2021 |
| Athlete Image Rights Ltd | Professional & scientific | 2026 |
| Atomic NE Trading Limited | Real estate | 2011 |
| Atrium Consultancy Limited | Professional & scientific | 2022 |
| Atrium Groupings Limited | Real estate | 2021 |
| Avantgarde Inspection Ltd | Professional & scientific | 2015 |
| Avenue Doctors Limited | Public administration | 2017 |
| Backstage Builders CIC | Arts & recreation | 2025 |
| Bargain Golf Equipment Limited | Wholesale & retail | 2009 |
| Bath Bomb Bliss Ltd | Manufacturing | 2023 |
| Batth Investments Group Limited | Real estate | 2025 |
| BE Squared Developments Limited | Real estate | 2022 |
| Beethoven House Car Wash Ltd | Administrative & support | 2025 |
| Believe Developments Limited | Construction | 2021 |
| Bella Marie Training Academy Ltd | Education | 2019 |
| Benazir Comms Ltd | Information & communication | 2022 |
| Beni & Beni Property Management Limited | Real estate | 2000 |
| Bess NO. 1 Limited | Administrative & support | 2026 |
| Beth Ward Ltd | Arts & recreation | 2017 |
| Betsey’S Limited | Hospitality | 2024 |
| Big Tatts Ltd | Arts & recreation | 2026 |
| Birch E-Commerce Ltd | Professional & scientific | 2023 |
| Black Truffle Boutique and Coffee Shop Limited | Wholesale & retail | 2011 |
| Bolt Care Services Ltd | Health & social care | 2020 |
| Bonus Draws Ltd | Arts & recreation | 2025 |
| Borehole Engineering Services Ltd | Construction | 2015 |
| Bowie Limited | Information & communication | 2015 |
| Bowie Properties Limited | Real estate | 2019 |
| Bravo Seaham Ltd | Hospitality | 2013 |
| Brennan's Tech Solutions Ltd | Professional & scientific | 2024 |
| Brown & Sutherland Associates Limited | Financial services | 2005 |
| Bruce's Gym Limited | Arts & recreation | 2017 |
| Buffalo Power Services Limited | Construction | 2003 |
| Building Solutions (N.E.) Ltd | Construction | 2008 |
| Burdon Technical Services Limited | Professional & scientific | 2007 |
| BY the Waves Deli Ltd | Hospitality | 2026 |
| Byron Travel Limited | Wholesale & retail | 2023 |
| C & C Holdings North East Limited | Financial services | 2023 |