| Grim UP North Ltd | Arts & recreation | 2016 |
| Grimescar Farm Ltd | Real estate | 2025 |
| GRL Electrical Limited | Administrative & support | 2016 |
| Ground Creative Agency Ltd | Professional & scientific | 2019 |
| Ground Gorillas Ltd | Construction | 2021 |
| Ground Screw Limited | Extraterritorial | 2018 |
| Ground Stabilisation Limited | Extraterritorial | 2024 |
| Groundshire Holdings Limited | Construction | 2018 |
| Groundshire Limited | Construction | 1977 |
| Groundwide Property Management Limited | Households | 1999 |
| Groundwork Services (Durham) Ltd | Construction | 2000 |
| Groundworx Utilities Ltd | Construction | 2023 |
| Grow 4 Good Ltd | Agriculture & fishing | 2011 |
| Grow Digital North Ltd | Professional & scientific | 2021 |
| Growing YOU Limited | Arts & recreation | 2025 |
| Growspace Limited | Real estate | 2019 |
| GRS Northeast Ltd | Construction | 2021 |
| GS Accountants Limited | Professional & scientific | 2015 |
| GS Interiors (Durham) Limited | Wholesale & retail | 2019 |
| Gsgt Limited | Professional & scientific | 2022 |
| GSM Marine and Renewables Ltd | Professional & scientific | 2022 |
| GT BMS Project Management Ltd | Professional & scientific | 2025 |
| GTR Lifting Ltd | Construction | 2025 |
| Guarnaccio Installations Ltd | Professional & scientific | 2025 |
| Guava Property Ltd | Real estate | 2020 |
| Guiding Hand Counselling Ltd | Other services | 2015 |
| Guilt Free Kitchen (Northern) Limited | Administrative & support | 2018 |
| Guthrie & Craig ( Digital Services ) Limited | Information & communication | 2022 |
| Guthrie & Craig (Engineering Services) Limited | Professional & scientific | 2016 |
| Guthrie & Craig (Management Services) Limited | Professional & scientific | 1995 |
| Guthrie & Craig (Training Services) Limited | Education | 2016 |
| GUY Rawlinson Landscape Architecture Limited | Construction | 2005 |
| Gvccollectables Ltd | Wholesale & retail | 2024 |
| GW Crosby Ltd | Construction | 2016 |
| GW Equipment Ltd | Wholesale & retail | 2018 |
| GWS Demolition Limited | Extraterritorial | 2022 |
| GWS Plant Limited | Administrative & support | 2017 |
| GY Property Limited | Hospitality | 2015 |
| Gymfluence Activewear Limited | Wholesale & retail | 2020 |
| H & BJ Assets Limited | Real estate | 2014 |
| H & J Banks Holdings Limited | Professional & scientific | 2023 |
| H & J Banks Investments Limited | Professional & scientific | 2018 |
| H & W Haulage Ltd | Transport & logistics | 2025 |
| H Estates (NE) Limited | Real estate | 2018 |
| H J Banks (Minerals) Limited | Professional & scientific | 1988 |
| H J Banks (Mining) Limited | Professional & scientific | 1994 |
| H J Banks (Shotton) Limited | Professional & scientific | 2008 |
| H J Banks Environmental Trust Limited | Professional & scientific | 2001 |
| H R Auto Specialists Limited | Wholesale & retail | 2016 |
| H Technical Resources Limited | Mining & quarrying | 2012 |
| H&A Groundworks Limited | Construction | 2026 |
| H&B Socks Ltd | Wholesale & retail | 2023 |
| H&M Healthcare Products Ltd | Real estate | 2021 |
| H&S Landscapes Ltd | Administrative & support | 2019 |
| H. Wren Maintenance Services Limited | Administrative & support | 2009 |
| H.J. Banks (Construction) Limited | Construction | 1956 |
| H.J. Banks and Company Limited | Mining & quarrying | 1976 |
| H.J. Banks Developments Limited | Professional & scientific | 1988 |
| H.J. Banks Investments Limited | Professional & scientific | 1988 |
| H18 Properties Ltd | Real estate | 2024 |
| H73 Limited | Real estate | 2025 |
| Haamel Properties LLP | | 2022 |
| Hacos Consulting Limited | Professional & scientific | 2018 |
| Hadife Enterprises Ltd | Real estate | 2024 |
| Haig Properties (NE) Limited | Real estate | 2021 |
| Hair by Sash Limited | Extraterritorial | 2005 |
| Hair Mechanics Limited | Other services | 2004 |
| Hair Studio (Teesdale) Limited | Other services | 2006 |
| Hairwaves (Unisex) Limited | Other services | 2003 |
| Halabja Ltd | Hospitality | 2018 |
| Halcyon Orange Limited | Real estate | 2005 |
| Halebria Ltd | Wholesale & retail | 2025 |
| Hall Newton Holdings Limited | Financial services | 2021 |
| Hall Newton Trading Limited | Wholesale & retail | 2021 |
| Hallgarth Farm Maintenance Limited | Households | 2004 |
| Halls of Durham Limited | Real estate | 1975 |
| Hammer and Pencil Ltd | Construction | 2026 |
| Hammer Strength Limited | Arts & recreation | 2008 |
| Hamsterley Cycle Hire Limited | Extraterritorial | 2006 |
| Hamsterley Forest Cycle Hire Limited | Extraterritorial | 2006 |
| Hamza Drireche Properties Ltd | Real estate | 2019 |
| HAN Bridge Trade Ltd | Wholesale & retail | 2025 |
| Hand Tuned Ltd | Wholesale & retail | 2024 |
| Handcrafted Projects | Health & social care | 2011 |
| Handy MAL Limited | Agriculture & fishing | 2004 |
| Happico NE Ltd | Hospitality | 2025 |
| Happiness Dawns Ltd | Arts & recreation | 2010 |
| Happy Noodles Ltd | Hospitality | 2024 |
| Happy PUB & Leisure Company Ltd | Hospitality | 2025 |
| Happy Seven Stars Inn Ltd | Hospitality | 2025 |
| Happy Space by Gosia Ltd | Construction | 2024 |
| Happy Space Properties Limited | Real estate | 2025 |
| Happy Station PUB Ltd | Hospitality | 2025 |
| Happy WOK Limited | Hospitality | 2024 |
| Happyness Dawns Ltd | Arts & recreation | 2010 |
| Harcor Group Ltd | Professional & scientific | 2024 |
| Hardanger Ltd | Real estate | 2023 |
| Hardy and Byrd Limited | Professional & scientific | 2017 |
| Hardy Plant Services Ltd | Manufacturing | 2023 |
| Hardys Roads Ltd | Construction | 2025 |