| 0800 Energy Services Limited | Extraterritorial | 2022 |
| 0800 Repair Ltd | Extraterritorial | 2010 |
| 1-4 Thornhill Park RTM Company Ltd | Households | 2017 |
| 100% OR Nothing Ltd | Other services | 2022 |
| 1720 Limited | Wholesale & retail | 2021 |
| 1798 Properties Ltd | Administrative & support | 2025 |
| 1NE Group Limited | Construction | 2018 |
| 1NE Home Limited | Real estate | 2020 |
| 2 Station Road Ltd | Other services | 2022 |
| 365 Reach Limited | Information & communication | 2025 |
| 3D Electrical Limited | Construction | 2016 |
| 3D Fire Limited | Public administration | 2025 |
| 3D Group NE Limited | Construction | 2026 |
| 3D Solar Limited | Construction | 2025 |
| 3SR Consulting Ltd | Professional & scientific | 2026 |
| A & O Ashcroft Property Ltd | Real estate | 2025 |
| A Crow Management Services Ltd | Administrative & support | 2009 |
| A French Holdings Limited | Other services | 2022 |
| A LIN 888 Ltd | Hospitality | 2021 |
| A M Electrical Services (NE) Ltd | Construction | 2025 |
| A T Leisure Limited | Administrative & support | 1999 |
| A&L Dean Properties Ltd | Real estate | 2025 |
| A.R.M Rigging Services Ltd | Information & communication | 2018 |
| A.S.E Catering and Events Ltd | Hospitality | 2024 |
| AAA Groundworks Ltd | Construction | 2018 |
| AAA Surfacing Limited | Construction | 2020 |
| Aadhira Groups PVT Ltd | Hospitality | 2025 |
| Aaron Breeze Pest Control Limited | Administrative & support | 2012 |
| Aarron Lodge Entertainment Limited | Arts & recreation | 2022 |
| Aathiya Retail Ltd | Wholesale & retail | 2025 |
| Able Roofing and Home Improvements Ltd | Construction | 2021 |
| AC Echo Ltd | Real estate | 2025 |
| AC Wind Limited | Professional & scientific | 2023 |
| Accelerate Inclusion Ltd | Professional & scientific | 2026 |
| Access Property Maintenance Ltd | Construction | 2022 |
| Accio Logistics Ltd | Transport & logistics | 2025 |
| Ace Windows (NE) Limited | Manufacturing | 2013 |
| ACM Renewable Solutions Ltd | Energy | 2026 |
| Acton Multi Services Ltd | Real estate | 2010 |
| Acumen Community Buildings Enterprises Ltd | Hospitality | 2023 |
| Acumen Community Buildings Ltd | Other services | 2017 |
| AD Animation Ltd | Information & communication | 2021 |
| Adam Hamdi Logistics Limited | Transport & logistics | 2025 |
| Adam Hamdi Ltd | Transport & logistics | 2024 |
| Adam Smith (North East) Limited | Health & social care | 2013 |
| ADF Property Group Limited | Real estate | 2025 |
| Adiuvisti Limited | Education | 2025 |
| Adly Fitness Limited | Arts & recreation | 2025 |
| Adly Health Limited | Health & social care | 2025 |
| ADS EYE Clinic Limited | Health & social care | 2015 |
| ADU Group Ltd | Construction | 2022 |
| Adviser 365 Ltd | Information & communication | 2025 |
| ADW Clothing Ltd | Wholesale & retail | 2022 |
| Aeng Development Limited | Construction | 2021 |
| Aeronauts Trampoline Club CIC | Arts & recreation | 2022 |
| Affinisa Housing Ltd | Real estate | 2021 |
| Affiniti Networks (NE) Limited | Information & communication | 2015 |
| Afriresourses Limited | Mining & quarrying | 2023 |
| Agans Corner Limited | Wholesale & retail | 2020 |
| Agecs Limited | Construction | 2016 |
| Agile Programme Management Limited | Information & communication | 2019 |
| AH Electrical ( Domestic ) Ltd | Construction | 2025 |
| Ahaven Properties Ltd | Real estate | 2025 |
| AIM Health & Wellness Ltd | Health & social care | 2024 |
| Air Dust Odour Ltd | Professional & scientific | 2025 |
| Airedale Forestry Limited | Agriculture & fishing | 2002 |
| AJ Creative Ltd | Wholesale & retail | 2022 |
| AJC RAW Ltd | Manufacturing | 2024 |
| AKD Limited | Wholesale & retail | 2015 |
| Akjl Limited | Other services | 2012 |
| AKT Motors Ltd | Wholesale & retail | 2024 |
| AL Access Ltd | Professional & scientific | 2023 |
| Alchemax Limited | Wholesale & retail | 2022 |
| Alcocommercials Ltd | Real estate | 2025 |
| Alex Robson Heating and GAS Ltd | Construction | 2020 |
| Alexander Catering Limited | Hospitality | 2025 |
| Alice and Elsie's Tearoom and Cafe Limited | Hospitality | 2016 |
| Alisor Delivery Ltd | Transport & logistics | 2022 |
| ALL Cars Direct Limited | Wholesale & retail | 2015 |
| Alliance Carpet & Upholstery Cleaning Ltd | Administrative & support | 2022 |
| Alligator Properties Ltd | Real estate | 2025 |
| ALM Records Limited | Arts & recreation | 2017 |
| Almighty Scran Ltd | Hospitality | 2025 |
| Alpro Capital Ltd | Professional & scientific | 2025 |
| AM Instrumentation Services Limited | Professional & scientific | 2022 |
| Amanda Bramley Associates Ltd | Education | 2011 |
| Amanda's Creature Comforts CIC | Education | 2023 |
| Amerium Leisure Limited | Real estate | 2018 |
| Amps Electrical NE Limited | Construction | 2018 |
| Anarchy Brew Co. Limited | Manufacturing | 2011 |
| Andy Hanratty Electrical Services Ltd | Construction | 2024 |
| Anex Building and Maintenance Ltd | Extraterritorial | 2024 |
| Angel Blinds & Shutters Ltd | Wholesale & retail | 2025 |
| Annfield Convenience Store Ltd | Wholesale & retail | 2025 |
| AOO Company Limited | Professional & scientific | 2017 |
| Apex Pinnacle Properties Ltd | Households | 2025 |
| Applause Accountancy Services Limited | Professional & scientific | 2009 |
| Applewoods Hiab & Transport Ltd | Transport & logistics | 2014 |
| AR Properties Northern Ltd | Construction | 2025 |
| Arete E&I Consultancy Ltd | Construction | 2026 |