| Greenwood Consultancy Ltd | Professional & scientific | 2015 |
| Greenworx Holdings Ltd | Financial services | 2023 |
| Greenworx Ltd | Agriculture & fishing | 2012 |
| Grey Horse Haughton 2026 Ltd | Hospitality | 2026 |
| Grey Mountain Ltd | Real estate | 2025 |
| Greyhound Accommodation Ltd | Real estate | 2022 |
| Groovycarrot Ltd | Information & communication | 2015 |
| Gryvor Ltd | Wholesale & retail | 2026 |
| Gsit Limited | Professional & scientific | 2012 |
| GSM Maintenance Solutions Ltd | Construction | 2017 |
| GTI Installation Ltd | Construction | 2023 |
| Gtkp Group Ltd | Real estate | 2025 |
| Guns & Game Ltd | Wholesale & retail | 2023 |
| Guram Limited | Real estate | 2025 |
| Gurlach Ltd | Professional & scientific | 2017 |
| Gutterball Ltd | Financial services | 2021 |
| GUTTERBALL10 Ltd | Arts & recreation | 2024 |
| GUTTERBALL11 Ltd | Arts & recreation | 2025 |
| GUTTERBALL12 Ltd | Arts & recreation | 2025 |
| GUTTERBALL13 Ltd | Arts & recreation | 2025 |
| GUTTERBALL14 Ltd | Arts & recreation | 2025 |
| GUTTERBALL15 Ltd | Arts & recreation | 2025 |
| GUTTERBALL16 Ltd | Arts & recreation | 2025 |
| GUTTERBALL17 Ltd | Arts & recreation | 2025 |
| GUTTERBALL18 Ltd | Arts & recreation | 2025 |
| GUTTERBALL19 Ltd | Arts & recreation | 2025 |
| GUTTERBALL2 Ltd | Arts & recreation | 2021 |
| GUTTERBALL20 Ltd | Arts & recreation | 2025 |
| GUTTERBALL3 Ltd | Arts & recreation | 2021 |
| GUTTERBALL4 Ltd | Arts & recreation | 2022 |
| GUTTERBALL5 Ltd | Arts & recreation | 2022 |
| GUTTERBALL6 Ltd | Arts & recreation | 2024 |
| GUTTERBALL7 Ltd | Arts & recreation | 2024 |
| GUTTERBALL8 Ltd | Arts & recreation | 2024 |
| GUTTERBALL9 Ltd | Arts & recreation | 2024 |
| GUY Sports Limited | Arts & recreation | 2010 |
| GW Air Conditioning & Refrigeration Limited | Manufacturing | 2004 |
| GWC Properties NE Limited | Real estate | 2024 |
| Gwennys Ices Static Ltd | Manufacturing | 2024 |
| Gypsum Group Ltd | Administrative & support | 2019 |
| H & E Lettings Limited | Real estate | 2023 |
| H & K Trading Ltd | Wholesale & retail | 2009 |
| H & S Consultants (UK) Limited | Health & social care | 2008 |
| H Burnside Motors Limited | Wholesale & retail | 2019 |
| H C Designs (Darlington) Limited | Professional & scientific | 2021 |
| H Caldwell Builders Ltd | Construction | 2017 |
| H Group International Ltd | Construction | 2026 |
| H Harrop Contractors Ltd | Construction | 2010 |
| H Harrop Trading Ltd | Wholesale & retail | 2020 |
| H J W Builders Limited | Construction | 2016 |
| H Merchandise Limited | Wholesale & retail | 2020 |
| H N Building Contractors NE Ltd | Administrative & support | 2019 |
| H Nicholson & Sons (Meat) Limited | | 1958 |
| H O North East Ltd | Mining & quarrying | 2016 |
| H Smith Ultra Clean Ltd | Administrative & support | 2009 |
| H Taylor & Sons Limited | Wholesale & retail | 2008 |
| H W Cladding and Roofing Services Ltd | Construction | 2023 |
| H&S Design Solutions Ltd | Professional & scientific | 2015 |
| H&W Media Limited | Information & communication | 2019 |
| H. J. I'Anson Limited | Construction | 2009 |
| H2 Data Limited | Administrative & support | 2003 |
| Habit Ltd | Health & social care | 2016 |
| Hadaya AL Mouseem Ltd | Wholesale & retail | 2025 |
| Haddenair Ltd | Construction | 2023 |
| HADES24 Limited | Hospitality | 2024 |
| Hadley Logistics Ltd | Transport & logistics | 2019 |
| HAI Campers Ltd | Administrative & support | 2024 |
| Haigh PS Ltd | Real estate | 2019 |
| Hair by Ann-Marie Ltd | Other services | 2017 |
| Hair by Megan Boddy Ltd | Other services | 2023 |
| Hair Leeds DL Limited | Other services | 2011 |
| Hair Passion Limited | Wholesale & retail | 2019 |
| HAK Housing Ltd | Real estate | 2023 |
| Hall of Famers Ltd | Arts & recreation | 2019 |
| Hall Properties (N/E) Ltd | Financial services | 2005 |
| Hall Properties Investment Ltd | Real estate | 2025 |
| Hallm Limited | Wholesale & retail | 2025 |
| Halo Corporate Holdings Ltd | Other services | 2023 |
| Halo Creative Limited | Professional & scientific | 2018 |
| Halo Hair Group Darlington Ltd | Other services | 2007 |
| Halo Hair Group Durham Ltd | Other services | 2024 |
| Halo Hair Group Glasgow Ltd | Other services | 2024 |
| Halo Hair Group Reading Ltd | Other services | 2024 |
| Halo Investment & Pension Solutions Limited | Professional & scientific | 2020 |
| Halo Products Limited | Wholesale & retail | 2009 |
| Hammajoti Limited | Financial services | 2026 |
| Hanafin Estates Limited | Construction | 2017 |
| Hanafin Properties Ltd | Real estate | 2017 |
| Hanafin Property Investments Ltd | Real estate | 2026 |
| Handy Property Maintenance Ltd | Construction | 2025 |
| Hannah Ayala Designs Ltd | Wholesale & retail | 2016 |
| Hannahs Hounds Ltd | Other services | 2024 |
| Hanratty Properties Ltd | Real estate | 2023 |
| Happy Nails & Spa Darlington Ltd | Other services | 2025 |
| Happy Paws (Yorkshire) Limited | Other services | 2024 |
| Happyhomes Residential Care Ltd | Health & social care | 2021 |
| Hardware Sales Limited | Transport & logistics | 2016 |
| Hare Properties LLP | | 2020 |
| Harita Ltd | Hospitality | 2018 |
| Harland Logistics Limited | Transport & logistics | 2012 |