| Greenhead Farm Properties Limited | Hospitality | 2023 |
| Greenside Media Ltd | Professional & scientific | 2025 |
| Grhp Limited | Construction | 2024 |
| Griffin Ridge Consulting Limited | Information & communication | 2015 |
| Gro-Green Landscapes Ltd | Administrative & support | 2007 |
| Guchon Ltd | Hospitality | 2026 |
| Halcyon Training Services Ltd. | Administrative & support | 2017 |
| Hamsterley Hire Limited | Administrative & support | 2024 |
| Harlau Limited | Financial services | 2023 |
| Harperley Logistics Ltd | Transport & logistics | 2023 |
| Harrison Inspection Ltd | Construction | 2018 |
| Head Turn Ltd. | Information & communication | 2016 |
| Headseal Ltd | Other services | 2022 |
| Heslop Consulting Limited | Administrative & support | 2020 |
| HNH Civils Ltd | Construction | 2025 |
| Hollybrook Health Psychology Ltd | Health & social care | 2021 |
| Homesavers Mortgages and Loans Limited | Financial services | 2000 |
| Hope Street Leisure Ltd | Hospitality | 2026 |
| Hornsey Harvesting Limited | Agriculture & fishing | 2012 |
| Howden Automotive Ltd | Wholesale & retail | 2021 |
| HQ Beauty Ltd | Other services | 2020 |
| HQ Salon Limited | Other services | 2003 |
| HRH Property Holdings Limited | Real estate | 2017 |
| HSH Durham Limited | Real estate | 2026 |
| Humble Artisan Ltd | Agriculture & fishing | 2025 |
| Hutchinson Plasterers Ltd | Construction | 2018 |
| Hybyli Ltd | Construction | 2020 |
| Hyperion Homes (XL) Limited | Professional & scientific | 2005 |
| I & L Enterprises Limited | Real estate | 2014 |
| IAN Harrison Independent Financial Services Ltd. | Financial services | 1997 |
| Icon Consultancy Services Ltd | Information & communication | 2017 |
| Icon Consultancy Services Private Limited | Information & communication | 2025 |
| Icon Software Solutions Limited | Information & communication | 2015 |
| Icon Tiles Limited | Wholesale & retail | 2021 |
| IES Industrial Electrical Services Limited | Construction | 2007 |
| Incredible Eggs Midlands Ltd | Education | 2023 |
| Incredible Eggs North Ltd | Agriculture & fishing | 2021 |
| Incredible Eggs Scot Ltd | Agriculture & fishing | 2022 |
| Inoveight Limited | Wholesale & retail | 2001 |
| International Education Agency Ltd | Education | 2024 |
| International Metal and Mineral Agents Limited | Mining & quarrying | 1975 |
| IT Services (for Business) Limited | Information & communication | 1999 |
| Italian Restaurant NE Limited | Hospitality | 2023 |
| It’S ALL About ROO Ltd | Wholesale & retail | 2024 |
| J & M Holiday and Lettings Ltd | Hospitality | 2025 |
| J & M Plant Limited | Construction | 2009 |
| J M Accountancy Ltd | Professional & scientific | 2003 |
| J Parrish Roofing Ltd | Construction | 2025 |
| J R Raine Groundworks Limited | Construction | 2021 |
| J&C Construction Limited | Construction | 2014 |
| J&F Bulk Solutions Ltd | Transport & logistics | 2019 |
| J.A LEE Roofing and Cladding Limited | Construction | 2015 |
| J.Askew Mechanical Ltd | Professional & scientific | 2023 |
| J.Mulligan Groundworks Ltd | Construction | 2021 |
| Jack Drum Arts C.I.C. | Arts & recreation | 1997 |
| Jade Henderson Ltd | Health & social care | 2025 |
| Jasmine Safety Ltd | Professional & scientific | 2017 |
| JC Audio Technical Production Ltd | Arts & recreation | 2025 |
| Jewel Crystals Limited | Wholesale & retail | 2019 |
| JH BKS Limited | Professional & scientific | 2023 |
| JIM Clark Property Limited | Construction | 2024 |
| JJ Property NE Ltd | Real estate | 2025 |
| JK Groundcare Limited | Administrative & support | 2026 |
| JKC and C Ltd | Hospitality | 2020 |
| JMC Lettings & Rentals Limited | Real estate | 2023 |
| John LOW Limited | Wholesale & retail | 1954 |
| John Taylor Architects Limited | Professional & scientific | 2003 |
| John Tennant Flooring Ltd | Wholesale & retail | 2024 |
| Joink Ltd. | Information & communication | 2025 |
| Jones Professional Services Ltd | Hospitality | 2016 |
| Jordan Kipling Ltd | Hospitality | 2025 |
| JRL Reach Ltd | Construction | 2026 |
| JRT Applications Ltd | Information & communication | 2026 |
| Juniper Property's North East Ltd | Real estate | 2024 |
| Jury MAN & Woman Limited | Wholesale & retail | 2006 |
| Just in Case Limited | Administrative & support | 2007 |
| K Hardman (Property Maintenance) Limited | Construction | 2003 |
| K J Kebab House Ltd | Hospitality | 2024 |
| K Roofing & Cladding Services Ltd | Construction | 2019 |
| KAL Roofing and Cladding Ltd | Construction | 2014 |
| KDT Decorating Limited | Construction | 2014 |
| KEN Lowery Driving Solutions Ltd | Transport & logistics | 2019 |
| Keylevel Consultants Limited | Information & communication | 1996 |
| Keystone Organisational Development Ltd | Professional & scientific | 2026 |
| Kingspeed Ltd | Real estate | 2025 |
| KKG Properties Ltd | Real estate | 2024 |
| KL Neeson Coaching Ltd | Administrative & support | 2024 |
| Klient Software Solutions Limited | Information & communication | 2021 |
| Knight North Limited | Professional & scientific | 2023 |
| Knockout Tape Ltd | Wholesale & retail | 2026 |
| KO Deliveries Ltd | Transport & logistics | 2019 |
| KSJ Transport Services Limited | Transport & logistics | 2008 |
| Kudos Audio Limited | Manufacturing | 2007 |
| Kx-Uk Limited | Professional & scientific | 2025 |
| L & G Property Rentals Limited | Real estate | 2015 |
| L Mcintyre Consulting Limited | Professional & scientific | 2026 |
| L&P Pubs Ltd | Hospitality | 2026 |
| L&W Windows Ltd | Construction | 2019 |
| LA Prime Logistics Ltd | Transport & logistics | 2026 |
| Laireon Games Ltd | Information & communication | 2016 |