| Japan Concept Limited | Administrative & support | 1998 |
| Jasmine and Lilah Design Ltd | Professional & scientific | 2021 |
| Jasmine and Lilah Interiors Ltd | Wholesale & retail | 2019 |
| JC Shearing Limited | Wholesale & retail | 2025 |
| Jobsio Ltd | Information & communication | 2024 |
| Jobsio Management Ltd | Administrative & support | 2024 |
| Judge Consulting Limited | Professional & scientific | 2013 |
| K.M.C. Joinery & Building Services Limited | Construction | 2015 |
| Keepers Cottage LLP | | 2022 |
| Kjs.Anp Limited | Health & social care | 2022 |
| Labourn Property Ltd | Real estate | 2010 |
| Lakeside Farm Ltd | Agriculture & fishing | 2020 |
| Leading Learning (Education) Limited | Education | 2006 |
| Level PAR Health & Safety Ltd | Professional & scientific | 2025 |
| LEW Cooks Ltd | Hospitality | 2026 |
| LTB Media Limited | Information & communication | 2008 |
| Luxq Management Ltd | Administrative & support | 2024 |
| Malinchismo Limited | Information & communication | 2026 |
| March Oaks Estates Ltd | Real estate | 2026 |
| March Oaks Ltd | Agriculture & fishing | 2025 |
| Maria Wilson Educational Psychology Services Ltd | Education | 2022 |
| Mark Errington Construction Ltd | Construction | 2013 |
| Michael Atkinson Architecture + Heritage Ltd | Professional & scientific | 2023 |
| MID Tyne Kids Club | Health & social care | 1998 |
| Mmcfoods Group Limited | Financial services | 2011 |
| MWL Ltd | Professional & scientific | 2025 |
| My Breeches Ltd | Wholesale & retail | 2019 |
| NE1 Properties Ltd | Real estate | 2024 |
| New Galloway Retreats Ltd | Hospitality | 2021 |
| Newton Forge Maintenance Limited | Administrative & support | 1989 |
| Newton Hall Consulting Limited | Professional & scientific | 2022 |
| Nixon Capital Ltd | Financial services | 2022 |
| NO 18 Boutique Ltd | Education | 2025 |
| North Found Architecture Limited | Professional & scientific | 2025 |
| Northumberland Physiotherapy Ltd | Extraterritorial | 2018 |
| Northumbria Leisure Limited | Arts & recreation | 1973 |
| Northumbrian Landscaping Limited | Administrative & support | 2012 |
| Oaklea Estates Ltd | Real estate | 2020 |
| Openplan Ltd | Real estate | 2024 |
| Orange Fern Limited | Information & communication | 2020 |
| Orbyx Ltd | Information & communication | 2026 |
| OS Ecology Holdings Limited | Professional & scientific | 2023 |
| OS Ecology Land Limited | Real estate | 2024 |
| OS Ecology Limited | Professional & scientific | 2019 |
| Padel POP Ltd | Wholesale & retail | 2026 |
| Pair Software Ltd | Information & communication | 2023 |
| Paper Dove Company Limited | Information & communication | 1997 |
| Pegasus Orthopaedics Ltd | Health & social care | 2025 |
| Petrides NM Limited | Health & social care | 2019 |
| PGR Construction Limited | Construction | 2007 |
| Pig-Consult Limited | Professional & scientific | 2024 |
| Pithoran Ltd | Manufacturing | 2023 |
| Prudhoe MOT and Service Centre Limited | Wholesale & retail | 2005 |
| Quadir Consultancy Limited | Professional & scientific | 2018 |
| Quality N.P. Healthcare Limited | Administrative & support | 2009 |
| Rams Building Services Limited | Construction | 2023 |
| Red October Gaming Ltd | Wholesale & retail | 2025 |
| Reflections Look Limited | Wholesale & retail | 2015 |
| Release Potential Ltd | Education | 2008 |
| RGS Masonry Ltd | Manufacturing | 2017 |
| Richardson Garden Supplies Limited | Administrative & support | 2026 |
| Safesports Limited | Professional & scientific | 2002 |
| Sanders Ellis Limited | Professional & scientific | 2014 |
| Scata Limited | Other services | 2012 |
| Shipcote Professional Services Limited | Extraterritorial | 2017 |
| SJG Safety Solutions Ltd | Public administration | 2019 |
| Skillogy International Limited | Education | 2008 |
| Soil Environment Services Limited | Professional & scientific | 2002 |
| Solway Capital Investments Ltd | Financial services | 2017 |
| Specialist Taxation Consulting Limited | Professional & scientific | 2002 |
| Stagshaw Ltd | Wholesale & retail | 2018 |
| Stelling Hall Farm Management Company Limited | Real estate | 2009 |
| Stelling Hall Management Limited | Administrative & support | 1999 |
| Stem Learning Solutions Limited | Education | 2017 |
| Stirling Communications Limited | Administrative & support | 2006 |
| Stocksfield Cricket Club CIC | Arts & recreation | 2024 |
| Stockswood Acres Limited | Agriculture & fishing | 2023 |
| Storey Industries Ltd | Financial services | 2024 |
| Stress Assist Ltd | Health & social care | 2007 |
| Stuartmanagementmedia Ltd | Arts & recreation | 2022 |
| Susi Bellamy Limited | Wholesale & retail | 2017 |
| T W Robb Plant Hire Limited | Construction | 2017 |
| Tablet Doctor Limited | Extraterritorial | 2012 |
| Team Sunflower Limited | Administrative & support | 2022 |
| Tempest Wind Renewables Ltd | Manufacturing | 2023 |
| THE Futsal Partnership Ltd | Arts & recreation | 2014 |
| THE Bongo Barn Limited | Wholesale & retail | 2015 |
| THE Capability Concierge Limited | Administrative & support | 2018 |
| THE Christian and Missionary Alliance | Other services | 1989 |
| THE Creative Side Ltd | Professional & scientific | 2019 |
| THE Geordie Crew Limited | Arts & recreation | 2017 |
| THE Hamilton Portfolio (Care Homes) Limited | Health & social care | 2009 |
| THE Lightworkers Academy Limited | Arts & recreation | 2015 |
| THE Stocksfield Handyman Ltd | Construction | 2023 |
| THE Water Safety Club Ltd | Education | 2026 |
| Tree Turbines Limited | Professional & scientific | 2024 |
| Triplet Media Ltd | Administrative & support | 2009 |
| Two Ordinary Fields Limited | Agriculture & fishing | 2024 |
| Tyne Property Holdings Ltd | Real estate | 2026 |
| Tyne Valley Properties Limited | Real estate | 2024 |