| Exclusive Holiday Locations Limited | Hospitality | 2020 |
| Expert Witness Psychology Ltd | Other services | 2018 |
| Exploration Associates Limited | Extraterritorial | 2014 |
| Eyeworks Group Limited | Wholesale & retail | 2025 |
| Eyeworks Industries Group Limited | Financial services | 2025 |
| Eyeworks Industries Limited | Wholesale & retail | 2007 |
| Farm, Estates & Property Services Limited | Construction | 2026 |
| Federation of Northumberland Development Trusts (Fondt) Limited | Administrative & support | 2010 |
| Fenkle Street Management Company Limited | Real estate | 2006 |
| Fernlea Ltd | Real estate | 2023 |
| Finrg Services Limited | Professional & scientific | 2003 |
| Fiona Dane Ltd | Wholesale & retail | 2025 |
| Flair (Rothbury) Ltd | Wholesale & retail | 2023 |
| Flamingo Lane Properties Limited | Real estate | 2017 |
| Flynn Joinery Limited | Construction | 2016 |
| Focus on the Solution Limited | Information & communication | 2011 |
| Frances Bell Limited | Arts & recreation | 2024 |
| Freestyle Maths Ltd | Education | 2023 |
| French Farms (Haxby) Limited | Financial services | 1971 |
| Freya Yachting LLP | | 2016 |
| Funky Needlework Ltd | Wholesale & retail | 2019 |
| G and V Tait Ltd | Agriculture & fishing | 2019 |
| G Dobson Groundworks Limited | Administrative & support | 2016 |
| G Fabrications Limited | Construction | 2020 |
| GCS Leisure Buildings Limited | Construction | 2021 |
| Geoff Saunders Construction Limited | Construction | 2018 |
| George Harrison (Whitby) Limited | Wholesale & retail | 1936 |
| GET Tatted Ltd | Other services | 2024 |
| GFC Nutrition Ltd | Health & social care | 2026 |
| Gibson Notaries Limited | Professional & scientific | 2014 |
| Gilson Media Ltd | Information & communication | 2020 |
| Glanton Enterprises Limited | Hospitality | 2023 |
| Go 2 CFO Limited | Professional & scientific | 2016 |
| Golds Pawnbrokers Ltd | Wholesale & retail | 2025 |
| Gordon Wilson Limited | Manufacturing | 2012 |
| Gorse Services Limited | Professional & scientific | 2015 |
| Graeme Smith Farrier Services Ltd | Other services | 2022 |
| Graeme Stenson Limited | Professional & scientific | 2007 |
| Grahams Yard Management Limited | Real estate | 2017 |
| GRC Haulage Ltd | Transport & logistics | 2023 |
| Greatsteaks Ltd | Hospitality | 2015 |
| Green Panther Garage Ltd | Wholesale & retail | 2021 |
| Greendykes Developments Ltd | Real estate | 2022 |
| Greenfingers Services Ltd | Arts & recreation | 2017 |
| Greensfield Developments Ltd | Construction | 2018 |
| Guns and Roses Ltd | Health & social care | 2021 |
| H.R Business Consultancy Ltd | Professional & scientific | 2025 |
| Hadrians Recruitment Limited | Administrative & support | 2013 |
| Half CUT Wines Limited | Wholesale & retail | 2015 |
| Hama (Northumberland) Limited | Real estate | 2023 |
| Hames Properties Limited | Real estate | 2021 |
| Hanibobs Cleaning Services Limited | Administrative & support | 2025 |
| Hansel Designs Limited | Real estate | 1973 |
| Happy Nails and Spa Alnwick Limited | Other services | 2025 |
| Harbottle Farming Company Limited | Real estate | 2018 |
| Hardington Hogg Solicitors LLP | | 2015 |
| Harehope Farm Management Company Limited | Professional & scientific | 2001 |
| Harehope Farms Limited | Agriculture & fishing | 1969 |
| Harry Hotspur Holdings Limited | Financial services | 2011 |
| Harvey Pipeline Systems Limited | Wholesale & retail | 2013 |
| Hautestyle Limited | Hospitality | 1983 |
| Health Policy Explained Limited | Professional & scientific | 2022 |
| Heaped Linen Limited | Other services | 2025 |
| Heatbase Ltd. | Construction | 2013 |
| Heather and Bale Ltd | Wholesale & retail | 2019 |
| Hebron Hill Management Company Ltd | Households | 2018 |
| Heckley Seeds Limited | Agriculture & fishing | 2013 |
| Hedgeley Antique Centre Ltd | Administrative & support | 2014 |
| Hedgeley Diversification Limited | Hospitality | 2026 |
| Hedley Design Limited | Professional & scientific | 2004 |
| Helen Kelly Property Services Ltd | Real estate | 2020 |
| Hemp North Limited | Agriculture & fishing | 2021 |
| Henny-Penny Town & Country Stores Ltd | Wholesale & retail | 2016 |
| Henry's Alnwick Limited | Hospitality | 2024 |
| Hetton Hall Management Company Limited | Construction | 2005 |
| High Newton Management Company Limited | Other services | 1998 |
| Highfield Northern Limited | Construction | 2012 |
| Hike & Hounds Ltd | Wholesale & retail | 2025 |
| Holystone Grange Limited | Construction | 2010 |
| Home Luxe Co Interiors Limited | Wholesale & retail | 2020 |
| Homes Rock Ltd | Construction | 2011 |
| Hopes and Dreams Renovations Ltd | Construction | 2015 |
| Hotchkiss Super Deltic Limited | Manufacturing | 2007 |
| Hotspur Barbers Ltd | Other services | 2025 |
| Hotspur Innovation Ltd | Professional & scientific | 2025 |
| Hotspur Residential Limited | Real estate | 2010 |
| Hourglass Serviced Accommodation Limited | Real estate | 2020 |
| Howick Hall Ltd | Real estate | 2021 |
| HPR International Ltd | Professional & scientific | 2015 |
| Hugh Fell Trustee Company Limited | Extraterritorial | 2015 |
| Hughes Aviation Engineering Ltd | Manufacturing | 2018 |
| Hummingbird Rental Properties Limited | Real estate | 2018 |
| I P R Wallis Limited | Professional & scientific | 2002 |
| I Wont Tell Ltd | Real estate | 2012 |
| Ijio Ltd | Construction | 2013 |
| Impact Retail Training Ltd | Professional & scientific | 2020 |
| IN Suum Ltd | Professional & scientific | 2023 |
| Infinity Health & Wellness Studio Ltd | Other services | 2022 |
| Inflate Events Ltd | Hospitality | 2025 |
| Innovate Testworks Ltd | Professional & scientific | 2025 |