| Alex Media Technology Limited | Information & communication | 2012 |
| Alex Muir Property Ltd | Real estate | 2025 |
| Alex Smiles Limited | Wholesale & retail | 1973 |
| Alex Telfer Photography Limited | Professional & scientific | 2002 |
| Alexage Limited | Hospitality | 1978 |
| Alexander Amatosi & Company Limited | Professional & scientific | 2011 |
| Alexander Carrick Furniture Limited | Manufacturing | 2000 |
| Alexander Grove (Swarland) Management Company Limited | Households | 2020 |
| Alexander Hudson Estates Ltd | Real estate | 2018 |
| Alexander Lloyd Levington Ltd | Financial services | 2023 |
| Alexander Owen Ltd | Professional & scientific | 2014 |
| Alexander Properties (North East) Limited | Real estate | 2010 |
| Alexander Stone Motors Ltd | Wholesale & retail | 2025 |
| Alexander T Holdings Limited | Professional & scientific | 2001 |
| Alexi Overseas Education Consultancy and Service Ltd | Education | 2022 |
| Alfa NCL Ltd | Real estate | 2023 |
| Alfabonduk Ltd | Manufacturing | 2025 |
| Alfresco Projects Ltd | Professional & scientific | 2023 |
| Alfurat Market Ltd | Wholesale & retail | 2024 |
| Alg-Va.Com Limited | Administrative & support | 2023 |
| Algernon Commercial Lets Limited | Real estate | 2025 |
| Alghazali Limited | Health & social care | 2026 |
| Alhamra Perfume Limited | Wholesale & retail | 2025 |
| Alhayat Asset Management Limited | Real estate | 2022 |
| ALI B Properties Ltd | Real estate | 2021 |
| ALI Dalko Ltd | Wholesale & retail | 2025 |
| ALI Nadeem Ltd | Wholesale & retail | 2026 |
| ALI Nails Ltd | Other services | 2024 |
| ALI Sea Ltd | Education | 2026 |
| Alias Solutions Ltd | Wholesale & retail | 2024 |
| Aliasghar Shop Ltd | Wholesale & retail | 2025 |
| Alidrew Engineering Limited | Wholesale & retail | 2003 |
| Aliendemons Limited | Construction | 2020 |
| Alif Homes Ltd | Real estate | 2024 |
| Alihasan Limited | Hospitality | 2024 |
| Alina Child Care Limited | Administrative & support | 2024 |
| Alisdair Miller Limited | Professional & scientific | 2016 |
| Alishba M Ltd | Wholesale & retail | 2023 |
| Alison Currie Ltd | Professional & scientific | 2015 |
| Alison Pilling Consultancy Limited | Professional & scientific | 2021 |
| Alison Robinson Ltd | Extraterritorial | 2012 |
| Alisonproductionservices Ltd | Information & communication | 2014 |
| Alistair Bartlett Dental Practices Limited | Health & social care | 2007 |
| Alistair Rogers Urology Limited | Health & social care | 2022 |
| Alita 1 Restaurants Limited | Hospitality | 2023 |
| Alita 101 Restaurant Limited | Hospitality | 2025 |
| Alita Restaurants Limited | Hospitality | 2014 |
| Alitib Limited | Construction | 2013 |
| Alixandra Court Management (North Shields) Limited | Real estate | 2004 |
| Aliya Fashion Limited | Wholesale & retail | 2025 |
| ALJ Roofing Ltd | Construction | 2025 |
| Aljabban Builder Limited | Construction | 2023 |
| Aljo Property Ltd | Real estate | 2018 |
| Alkaro Hospitality Limited | Other services | 2020 |
| ALL About the Box Ltd | Manufacturing | 2026 |
| ALL About the Detail Joinery Ltd | Manufacturing | 2023 |
| ALL Global Consultancy Services Ltd | Wholesale & retail | 2025 |
| ALL Global Recruitment Solutions Ltd | Wholesale & retail | 2025 |
| ALL Graphics Limited | Arts & recreation | 2017 |
| ALL in 1 FM Ltd | Professional & scientific | 2024 |
| ALL in One Academy Limited | Education | 2022 |
| ALL IS Bright Limited | Health & social care | 2011 |
| ALL One Planet Ltd | Information & communication | 2017 |
| ALL OUT Social Limited | Administrative & support | 2019 |
| ALL Residential Ltd | Real estate | 2025 |
| ALL Solution Construction Ltd | Construction | 2013 |
| ALL the Rage Records Ltd | Information & communication | 2026 |
| ALL the Trades Limited | Construction | 2016 |
| ALL Trades North East Ltd | Construction | 2025 |
| ALL Ways Good Company C.I.C. | Arts & recreation | 2023 |
| Allard's Hospitality Group Ltd | Hospitality | 2022 |
| Allay Claims Ltd | Administrative & support | 2009 |
| Alleleven Ltd | Transport & logistics | 2024 |
| Allen Management Group Ltd | Financial services | 2025 |
| Allena Clarke Appointments Limited | Administrative & support | 2024 |
| Allengaged Ltd | Professional & scientific | 2022 |
| Allergy Educated C.I.C. | Education | 2024 |
| Allery Education Limited | Education | 2022 |
| Alleyoop SER Ltd | Professional & scientific | 2025 |
| Alliance Newcastle Limited | Arts & recreation | 2024 |
| Allied Strategic Ventures Ltd | Administrative & support | 2024 |
| Allies Group Limited | Information & communication | 2015 |
| Alloy Strategies Ltd. | Professional & scientific | 2018 |
| Alls Developments Ltd | Real estate | 2022 |
| Allure Jesmond Ltd | Other services | 2023 |
| Allweather Windows (N E) Ltd | Construction | 2014 |
| Allyours Development Limited | Real estate | 2020 |
| Allyours Investments Limited | Real estate | 2025 |
| ALM FLY Fishing Ltd | Wholesale & retail | 2023 |
| Alma Resources Limited | Financial services | 2011 |
| Almasty Brewing Company Ltd | Manufacturing | 2014 |
| Almere Limited | Real estate | 2016 |
| Almithaaliyah Ltd | Manufacturing | 2025 |
| Almond Properties Newcastle Limited | Households | 2019 |
| Almustashara Satellite Television Channel Ltd | Arts & recreation | 2015 |
| ALN Technology Ltd | Information & communication | 2013 |
| Alnwick Ales Limited | Manufacturing | 2003 |
| Alnwick Dental Partnership Limited | Health & social care | 2023 |
| Alnwick Properties Ltd | Real estate | 2025 |
| Alnwick Studio Limited | Other services | 2016 |