| Giogio Global Limited | Wholesale & retail | 2026 |
| Glaze Windows & Doors Ltd | Wholesale & retail | 2020 |
| Glencoul Holdings Limited | Real estate | 2023 |
| Glenny 2000 Limited | Agriculture & fishing | 2000 |
| GLO Digital Ltd | Professional & scientific | 2024 |
| Global Commissioning Services Ltd | Other services | 2021 |
| Global Print Services Limited | Manufacturing | 2004 |
| Global Soclean Solutions Ltd | Administrative & support | 2023 |
| Global Trenching Limited | Extraterritorial | 2000 |
| Globus Services (UK) Limited | Administrative & support | 2017 |
| Glow by Jodi Ltd | Other services | 2025 |
| GLP Electrical & Engineering Services Ltd | Construction | 2022 |
| Gnanakumar Trading Ltd | Real estate | 2025 |
| Go Happy Cake Limited | Manufacturing | 2017 |
| Go Learn DO Ltd | Professional & scientific | 2021 |
| Go Staffing Ltd | Administrative & support | 2025 |
| Goddard Processing Limited | Information & communication | 2025 |
| Gold Barn Properties Limited | Construction | 2015 |
| Golden Grove Nursery Limited | Agriculture & fishing | 2013 |
| Golden Wings of Boston UK Ltd | Hospitality | 2022 |
| Goldsmiths Windows and Doors Limited | Construction | 2026 |
| Golf Haven Ltd | Arts & recreation | 2023 |
| Gordon Brothers International, LLC | | 1998 |
| Gosavi & Poddar Ltd | Health & social care | 2010 |
| GP Creative Limited | Information & communication | 2023 |
| GPC Specialist Tea Room C.I.C. | Hospitality | 2020 |
| Graceomoloscrupps Ltd | Health & social care | 2025 |
| Graham Almack Fire Safety Services Ltd | Administrative & support | 2018 |
| Grainger Capital Investments Ltd | Real estate | 2020 |
| Grammar School Cottages Management Company Limited | Households | 2006 |
| Grand Retail Trading Ltd | Wholesale & retail | 2023 |
| Grandma's Cake Ltd | Manufacturing | 2025 |
| Grange Estates (England) Limited | Agriculture & fishing | 2014 |
| Grant Brothers (Frithbank) Limited | Agriculture & fishing | 1948 |
| Grant Farm Services Ltd | Administrative & support | 2016 |
| Grant Farming Limited | Financial services | 2012 |
| Grantus Limited | Professional & scientific | 2004 |
| Grassroots Football Media Ltd | Wholesale & retail | 2020 |
| Great British Living Ltd | Real estate | 2015 |
| Great Move Services Ltd | Wholesale & retail | 2025 |
| Green Engineering Support Ltd | Manufacturing | 2023 |
| Green Escapes Lincs Limited | Hospitality | 2023 |
| Green Live Limited | Construction | 2022 |
| Greenbelt (PVC) Limited | Manufacturing | 2020 |
| Greenfield Bakers LLP | | 2007 |
| Greenhills Lawncare Ltd | Administrative & support | 2024 |
| Greenhold Care Homes Ltd | Health & social care | 2005 |
| Greenscape Tree Safe Ltd | Administrative & support | 2014 |
| Greenteam Organisation UK Limited | Other services | 2022 |
| Gregory Spurrier Ltd | Real estate | 2023 |
| Grey Wolf Scaffolding Ltd | Construction | 2022 |
| Greyhound Plumbing Ltd | Construction | 2025 |
| Griffin Portfolios Limited | Real estate | 2010 |
| Grimme (U.K.) Limited | Manufacturing | 1993 |
| Grove House (Boston) Residents Management Limited | Real estate | 2016 |
| Grudz Ltd | Transport & logistics | 2025 |
| Gryg & Sindy Transport Limited | Transport & logistics | 2016 |
| GS Trans (Boston) Ltd | Administrative & support | 2015 |
| GT Motorworld Ltd | Wholesale & retail | 2022 |
| GTX Warehouse and Distribution Ltd | Transport & logistics | 2025 |
| Guardian Care Governance Ltd | Information & communication | 2025 |
| Guardian Storage Limited | Transport & logistics | 2002 |
| GUM Transport Limited | Transport & logistics | 2024 |
| Gunars Transport Limited | Transport & logistics | 2016 |
| Gurton Properties Ltd | Real estate | 2026 |
| Gutierrez Limited | Health & social care | 2021 |
| GUY and JO Ltd | Construction | 2018 |
| H Corbett Construction Ltd | Construction | 2023 |
| H Vince Properties (Boston) Limited | Real estate | 2025 |
| H&H Environmental Ltd | Agriculture & fishing | 2025 |
| H&I Bulgarian Grill &Restaurant Ltd | Hospitality | 2026 |
| H. & E. Horswood Limited | Real estate | 1951 |
| H. Burnett & Sons Limited | Agriculture & fishing | 1953 |
| H.G.Tunnard Limited | Agriculture & fishing | 1961 |
| Haighon Ltd | Administrative & support | 2017 |
| Haiker Ltd | Wholesale & retail | 2018 |
| Hair by BEN Graham Ltd | Other services | 2023 |
| Hair by Ruby Maxwell Ltd | Other services | 2023 |
| Hall Green Pubs Limited | Hospitality | 2006 |
| Hall Weir Electrical Limited | Construction | 2022 |
| Halomoon Jewellery Ltd | Wholesale & retail | 2026 |
| Hambleton Financial Planning Ltd | Administrative & support | 2004 |
| Hambleton LET Limited | Real estate | 2021 |
| Hammond House Management Company Limited | Households | 2006 |
| Hammonds Housing Limited | Real estate | 2023 |
| Hantex Limited | Wholesale & retail | 1994 |
| Happy Flavours Ltd | Hospitality | 2023 |
| Happy People Psychiatry Ltd | Health & social care | 2015 |
| Happy Rainbow Homes Limited | Construction | 2016 |
| Harbourvest Mercurius L.P. | | 2017 |
| Harbourvest Vulcanus L.P. | | 2017 |
| Hardstaff Cleaning Services Ltd | Administrative & support | 2015 |
| Harp Contracting Ltd | Agriculture & fishing | 2017 |
| Harris Engineering Solutions Ltd | Wholesale & retail | 2017 |
| Harrison Groundworks & Civils Ltd | Construction | 2019 |
| Harrison Inns Limited | Hospitality | 2013 |
| Harwood & Sons Ltd | Construction | 2022 |
| Harwood Import/Export Limited | Agriculture & fishing | 1994 |
| Haven Plumbing and Heating Services Limited | Construction | 2003 |
| Haven Trading Limited | Real estate | 2010 |