| Intu Discovery Limited | Health & social care | 2016 |
| J Burns Tree Surgery & Landscaping Ltd | Administrative & support | 2026 |
| J&G Rentals Limited | Construction | 2021 |
| Jack F Woods Limited | Professional & scientific | 2021 |
| Jacksons Blinds Ltd | Construction | 2021 |
| Jane Lowes Human Resources Limited | Professional & scientific | 2012 |
| JB Woodstock PUB Co Ltd | Hospitality | 2024 |
| Jdsd Consulting Ltd | Professional & scientific | 2022 |
| JMJ Dentistry Ltd | Health & social care | 2026 |
| John Nicholson Associates Limited | Agriculture & fishing | 2000 |
| Jumpstart Products Ltd | Information & communication | 2023 |
| Kash AI SMM Limited | Other services | 2024 |
| KBB Interior Designs Limited | Other services | 2016 |
| Khajaj Ltd | Professional & scientific | 2026 |
| L Mason HSE Services Ltd | Professional & scientific | 2019 |
| Landscape Outlook Limited | Administrative & support | 2003 |
| Lavinia Driving School Ltd | Education | 2025 |
| Lillydrift Ltd | Professional & scientific | 2013 |
| Link Automotive Ltd | Wholesale & retail | 2025 |
| Link Construction and Cleaning Services Limited | Construction | 2017 |
| Link Freight Services Limited | Transport & logistics | 2025 |
| Link Holdings NE Limited | Real estate | 2024 |
| Lintzford Mill Management Company Limited | Households | 1995 |
| Lintzford Properties Ltd | Real estate | 2015 |
| Littleforce Limited | Public administration | 2015 |
| Living Luxe Homes Ltd | Real estate | 2024 |
| Lockhaugh Ltd | Real estate | 2025 |
| Loving Touch Dog Groomers Ltd | Administrative & support | 2005 |
| Lumley Leadwork & Roofing Limited | Construction | 2025 |
| M & M Haulage (Ryton) Limited | Transport & logistics | 2015 |
| M Rook Electrical Ltd | Construction | 2025 |
| M T Property Assets Limited | Other services | 2010 |
| MADE2SHARE Limited | Professional & scientific | 2024 |
| Maguires Limited | Hospitality | 1988 |
| MAN Investment Holding (UK) Ltd | Financial services | 2023 |
| Manx Professional Services Limited | Administrative & support | 2016 |
| Marketwise Strategies Limited | Professional & scientific | 2001 |
| Mcardle Design Limited | Professional & scientific | 2021 |
| Mccutcheon Enterprises Ltd | Information & communication | 2025 |
| Mckee Hatch Property Limited | Real estate | 2020 |
| Mech ENG Co Limited | Professional & scientific | 1991 |
| Medomsley Organics Limited | Agriculture & fishing | 2019 |
| Meet ME on the Hill Ltd | Hospitality | 2024 |
| MEI WEI Food Ltd | Hospitality | 2022 |
| Melbourne Associates Ltd | Professional & scientific | 2020 |
| Milvus Holdings Ltd | Financial services | 2022 |
| Mj's North East Ltd | Other services | 2026 |
| MJK Plastics Limited | Manufacturing | 2015 |
| Morley Waste Removals Ltd | Water & waste | 2025 |
| Moxie Catering Ltd | Hospitality | 2018 |
| MT Farm Plastics Ltd | Water & waste | 2024 |
| NES Offshore Limited | Professional & scientific | 2023 |
| New October Ltd | Professional & scientific | 2014 |
| Nexn Limited | Wholesale & retail | 2005 |
| North East Brick Slips Ltd | Manufacturing | 2024 |
| North East FD Services Limited | Professional & scientific | 2019 |
| Northsurvival Ltd | Agriculture & fishing | 2023 |
| Norvell (UK) Limited | Other services | 2015 |
| Nutri-Explorers Ltd | Wholesale & retail | 2025 |
| OL Residential Ltd | Real estate | 2024 |
| Ostara Moon Ltd | Wholesale & retail | 2012 |
| Parents, Families and Allies Network (Pfan) CIC | Professional & scientific | 2025 |
| Park Consultancy (UK) Limited | Professional & scientific | 2010 |
| Phonics Tracker Limited | Information & communication | 2016 |
| Plan 3 Ltd | Manufacturing | 2024 |
| Ponthaugh Systems Limited | Information & communication | 2012 |
| PTS IT Consulting Ltd | Information & communication | 2022 |
| Pumphrey Electricals Limited | Construction | 2024 |
| Pumphrey Homes Ltd | Construction | 2026 |
| Purple Squircle Limited | Professional & scientific | 2015 |
| Quantum Singularity Consulting Ltd | Administrative & support | 2017 |
| Racant Business Services Ltd | Administrative & support | 2016 |
| Raecomm Services Ltd | Professional & scientific | 2016 |
| Rastafairies Ltd | Wholesale & retail | 2010 |
| RDL Building Services (NE) Ltd | Construction | 2020 |
| Red Kite BPM Ltd | Information & communication | 2020 |
| Red Kite Caravan Holidays Ltd | Hospitality | 2022 |
| Red Kite Recruitment Solutions Limited | Administrative & support | 2018 |
| Reeves WOK Limited | Hospitality | 2024 |
| Rhaze Technologies Limited | Professional & scientific | 2021 |
| Ridge Components Ltd | Wholesale & retail | 2017 |
| Riverside School of Motoring Limited | Education | 2016 |
| Roots Occupational Therapy Ltd | Health & social care | 2026 |
| Rosebirch Limited | Construction | 2014 |
| Rytek Consulting Ltd | Professional & scientific | 2025 |
| S&Lp Properties Ltd | Real estate | 2020 |
| Sam-Divine Health Vanguard International CIC | Professional & scientific | 2024 |
| Sandhill Home Improvements Ltd | Manufacturing | 2020 |
| Sare Maxxhold Ltd | Professional & scientific | 2013 |
| Shades 4 Seasons Ltd | Wholesale & retail | 2024 |
| Shirley Collins Limited | Wholesale & retail | 1987 |
| Silverback Strategic Solutions Ltd | Professional & scientific | 2026 |
| Sk&N Ltd | Real estate | 2026 |
| Sorella Sorella Ltd | Hospitality | 2012 |
| Sport Concussion Management and Education Ltd | Education | 2024 |
| STP Construction Limited | Construction | 2002 |
| Straight Bourbon Music Ltd | Arts & recreation | 2013 |
| Surya Properties Ltd | Real estate | 2023 |
| SY Consultancy Services Limited | Professional & scientific | 2016 |
| System Horizons Ltd | Information & communication | 2013 |