| GMS Polymer Limited | Manufacturing | 2012 |
| Go RAW Limited | Wholesale & retail | 2019 |
| Go Show - Productions Limited | Administrative & support | 2025 |
| Gold Sports Consulting Ltd | Arts & recreation | 2025 |
| Golden Houseland Ltd | Real estate | 2025 |
| Golden Scissor TR Ltd | Other services | 2018 |
| Goldglide Ltd | Real estate | 2009 |
| Good Life Florida Villas Limited | Administrative & support | 2006 |
| Good Life Travel Limited | Extraterritorial | 2001 |
| Good Place Planning Ltd | Professional & scientific | 2021 |
| Gowards LLP | | 2015 |
| GPK Property Investment Limited | Real estate | 2017 |
| Grace Communion International | Other services | 1960 |
| Grace Senior Living Ltd | Health & social care | 2025 |
| Graceful Muse Paperie Limited | Wholesale & retail | 2024 |
| Graded Coins Limited | Wholesale & retail | 2023 |
| Graeme Ough Properties Limited | Real estate | 2006 |
| Graham Kitchener Limited | Arts & recreation | 2012 |
| Graham Packer Limited | Wholesale & retail | 2002 |
| Graham Wolloff Limited | Other services | 2009 |
| Granary Yard Estate Management Limited | Households | 2024 |
| Grand Cafe Northampton Limited | Hospitality | 2024 |
| Grange Biopower Limited | Professional & scientific | 2013 |
| Grange Equity Advisors Limited | Professional & scientific | 2024 |
| Grange Farm Christmas Barn Limited | Agriculture & fishing | 2021 |
| Granite Trustee Company Limited | Administrative & support | 2010 |
| Graphic Business Forms Limited | Manufacturing | 1995 |
| Grasholm Ltd | Information & communication | 2007 |
| Grassroots HQ Ltd | Information & communication | 2025 |
| Great Bowden Hall Gardens Limited | Real estate | 1997 |
| Great Bowden Hall Limited | Professional & scientific | 1997 |
| Great Bowden Properties Limited | Real estate | 2018 |
| Great Bowden Residents Management Company Limited | Real estate | 2017 |
| Great White Hereward Hall Ltd | Construction | 2022 |
| Great Wyte Ltd | Construction | 2019 |
| Green Bottoms Limited | Water & waste | 2009 |
| Green Ginger Kitchen Limited | Hospitality | 2021 |
| Green Living Developments Ltd | Construction | 2020 |
| Green Shoots (Midlands) Ltd | Transport & logistics | 2020 |
| Green Shoots Research Limited | Professional & scientific | 2014 |
| Greenapple Associates Limited | Construction | 2006 |
| Greenergolf Network Ltd | Professional & scientific | 2022 |
| Greenwingstransfers Ltd | Transport & logistics | 2019 |
| Gregory Millar Design Limited | Professional & scientific | 2013 |
| Gretton Site Investigations Ltd | Construction | 2014 |
| Grewt Property Management Limited | Real estate | 2019 |
| Greyhound Fabrications Ltd | Manufacturing | 2003 |
| Greyhound Leisure Limited | Construction | 2001 |
| Grina Property Ltd | Real estate | 2024 |
| Grizzly Sounds Ltd | Information & communication | 2020 |
| Groacs Ltd | Public administration | 2022 |
| Groom & Brown Limited | Real estate | 2015 |
| Grounded Sensors Ltd | Manufacturing | 2023 |
| Growtique Ltd | Professional & scientific | 2024 |
| GSI RIG Rental Ltd | Administrative & support | 2021 |
| GST Developments Limited | Real estate | 1993 |
| GT Assist Limited | Professional & scientific | 2025 |
| Gt-Shu Ltd | Wholesale & retail | 2023 |
| GTG Joinery Solutions Limited | Construction | 2018 |
| Gt’S Caterig Ltd Ltd | Hospitality | 2024 |
| Guardian Homes 2020 Limited | Real estate | 2020 |
| Guildhall Press (Northampton) Limited | Real estate | 1962 |
| GW Nuclear Consultants Limited | Professional & scientific | 2010 |
| GWM Farms (Braybrooke) Limited | Agriculture & fishing | 2021 |
| Gwsv Consultants Ltd | Professional & scientific | 2018 |
| Gym 11 Limited | Arts & recreation | 2014 |
| H E Burgess Ltd | Professional & scientific | 2023 |
| H&C's Trees Ltd | Wholesale & retail | 2023 |
| Hair by Bryony Ltd | Other services | 2024 |
| Hairlines (Bletchley) Limited | Other services | 2011 |
| Hairlines Properties Limited | Real estate | 2019 |
| Halborg & Co. Legal Services Limited | Professional & scientific | 2019 |
| Hallaton Cottages Ltd | Hospitality | 2022 |
| Hallaton Ground Care Limited | Agriculture & fishing | 2008 |
| Hallmac Sourcing Ltd | Professional & scientific | 2024 |
| Hallmex Associates Limited | Professional & scientific | 2010 |
| Hamilton Webster Limited | Administrative & support | 2002 |
| Hamiltons Estates Limited | Real estate | 2023 |
| Hammonds Enterprises Ltd | Professional & scientific | 2012 |
| Hams 1989 Ltd | Wholesale & retail | 2016 |
| Hamza Property Limited | Real estate | 2019 |
| Hanbury Gardens (Church Langton) Management Company Limited | Households | 2022 |
| Handsome Sound Limited | Other services | 2014 |
| Hanji/Patel Market Harborough Limited Partnership | | 2011 |
| Hanlon Corporate Advisory Ltd | Professional & scientific | 2016 |
| Hanworth Interiors Ltd. | Wholesale & retail | 2014 |
| Happy Days Cruises Ltd | Hospitality | 2023 |
| Harbinger Holdings Ltd | Financial services | 2025 |
| Harbinger Properties Ltd | Real estate | 2025 |
| Harborians Ltd | Information & communication | 2025 |
| Harboro Enterprises Limited | Real estate | 2010 |
| Harboro Holdings Limited | Financial services | 2025 |
| Harborough Aerials Ltd | Professional & scientific | 2020 |
| Harborough Architectural Services Ltd | Professional & scientific | 2026 |
| Harborough Autos Ltd | Wholesale & retail | 2021 |
| Harborough Barber Ltd | Other services | 2020 |
| Harborough Blinds Limited | Other services | 2007 |
| Harborough Cctv & Security Limited | Administrative & support | 2023 |
| Harborough Construction Services Ltd | Administrative & support | 2026 |
| Harborough District Commercial Services Limited | Real estate | 2019 |