| Green JAY Ltd | Professional & scientific | 2019 |
| Green Lane Nurseries Limited | Agriculture & fishing | 2019 |
| Greenaway Amenity Limited | Manufacturing | 2000 |
| Greenco Berkswell Ltd | Manufacturing | 2024 |
| Greenfield Building Services (East) Ltd | Construction | 2020 |
| Greenfields Lincs Management Company Ltd | Households | 2021 |
| Greenleaf Tree Services Ltd | Administrative & support | 2024 |
| Greenways Storage Units Ltd | Real estate | 2022 |
| Gregal (UK) Limited | Wholesale & retail | 1994 |
| Gregory U. Transport Limited | Administrative & support | 2016 |
| Gregpas Ltd | Transport & logistics | 2021 |
| Grengen Ltd | Construction | 2025 |
| Grey Wolfe Ltd | Other services | 2020 |
| Greyfriars Limited | Real estate | 1998 |
| Griff (Norfolk) Limited | Transport & logistics | 2007 |
| Grimmwolf Investments Limited | Real estate | 2025 |
| GRM (W Midlands) Ltd | Professional & scientific | 2023 |
| Grooby Farming Limited | Administrative & support | 2007 |
| Groom Bros Limited | Real estate | 1932 |
| Groovie Life Ltd | Information & communication | 2022 |
| Grosvenor Shows Limited | Arts & recreation | 2009 |
| Ground Tech Midlands Ltd | Construction | 2017 |
| Growers Connect Ltd | Manufacturing | 2020 |
| Growers Direct Limited | Wholesale & retail | 2016 |
| Growth Mobility Ltd | Manufacturing | 2026 |
| Gruca Trans Ltd | Transport & logistics | 2024 |
| Grundy Produce (Spalding) Limited | Professional & scientific | 1969 |
| GRW Holdings Limited | Financial services | 2025 |
| GRW Process Solutions Ltd | Administrative & support | 2020 |
| Grzeg Trans Ltd | Transport & logistics | 2015 |
| Grzybek Service Ltd. | Transport & logistics | 2014 |
| Grzybek Transport Ltd | Transport & logistics | 2015 |
| GSD Electrical Limited | Construction | 2019 |
| Gsol Limited | Construction | 2013 |
| GT Construction Civils Ltd | Construction | 2021 |
| GT Plumbing and Heating Services Limited | Other services | 2015 |
| GTM Landscaping Ltd | Construction | 2019 |
| GTS Security Limited | Construction | 2009 |
| Gulden Trans Ltd | Transport & logistics | 2015 |
| Gunns & Roses Ltd | Construction | 2017 |
| Gutter GUY (Lincs) Ltd | Administrative & support | 2026 |
| Guttridge Limited | Manufacturing | 1962 |
| GVB Property Limited | Real estate | 2025 |
| H & M Electrics Limited | Construction | 2002 |
| H Goose Farming Limited | Agriculture & fishing | 2023 |
| H K Gott & SON Limited | Construction | 2006 |
| H PAY Processing Ltd | Construction | 2023 |
| H SLY and Sons Limited | Agriculture & fishing | 2017 |
| H Triple a Holdings Ltd | Financial services | 2024 |
| H W Myers Limited | Professional & scientific | 2021 |
| H Z Logistics UK Ltd | Other services | 2015 |
| H&R Rocha Ltd | Construction | 2025 |
| H&S Bright Futures Ltd | Real estate | 2020 |
| H. Casswell and SON (Gosberton) Limited | Agriculture & fishing | 1952 |
| H.K. Commercial Solutions Ltd | Professional & scientific | 2025 |
| H.Shields Group Limited | Financial services | 2026 |
| Haba Rugs UK Ltd | Wholesale & retail | 2018 |
| Haden Park Homes Ltd | Construction | 2026 |
| Haden Paving & Landscaping Ltd | Administrative & support | 2025 |
| Haden Roofing Ltd | Construction | 2025 |
| Hadfield Ltd | Wholesale & retail | 2022 |
| Hadi Trans Ltd | Transport & logistics | 2016 |
| Haemochromatosis UK | Health & social care | 1990 |
| Hair Connection Whittlesey Limited | Other services | 2024 |
| Hair WE Go Ltd | Other services | 2022 |
| Halabis Ltd | Transport & logistics | 2019 |
| Halifax and Johnson Limited | Transport & logistics | 1996 |
| Hallgarth Shoot Ltd | Transport & logistics | 2016 |
| Hallgate Timber Limited | Manufacturing | 2008 |
| Hallifax Haulage Limited | Transport & logistics | 2023 |
| Halls Construction Services Limited | Construction | 2023 |
| Halls Interiors and Renovations Limited | Construction | 2021 |
| Halls Plumbing & Heating Services Limited | Construction | 2020 |
| Halmshaw Building Design Limited | Other services | 2015 |
| Halo Photo Booth Co. Ltd | Professional & scientific | 2023 |
| Halo Property Investors Limited | Real estate | 2017 |
| Halsey & Steadman Construction Limited | Construction | 2024 |
| Halverstone Ltd | Financial services | 2026 |
| Hamilton Lettings and Property Management Ltd | Real estate | 2019 |
| Hamish Holdings Ltd | Information & communication | 2026 |
| Hammond Live Ltd | Arts & recreation | 2014 |
| Hand ME Down Hub Community Interest Company | Wholesale & retail | 2025 |
| Handscomb Pets Limited | Wholesale & retail | 2005 |
| Hannah Hollings Travel Ltd | Administrative & support | 2024 |
| Hanson Court Management Company Limited | Households | 2006 |
| Haoskel Ltd | Hospitality | 2025 |
| Happy Hoper Limited | Transport & logistics | 2024 |
| Harbord House Management Company Limited | Households | 2001 |
| Hardean Developments Ltd | Construction | 2025 |
| Hargrave Agriculture Limited | Wholesale & retail | 1997 |
| Harkenn Limited | Water & waste | 2010 |
| Harlie-Quinn Farm & Coffee Shop Ltd | Wholesale & retail | 2025 |
| Harlie-Quinn Farm Shop (2025) Ltd | Wholesale & retail | 2025 |
| Harmony + Hues Limited | Real estate | 2022 |
| Harrington House Limited | Construction | 2015 |
| Harrington's Catering Limited | Hospitality | 2022 |
| Harris Morgan Ltd | Manufacturing | 2026 |
| Harrison Rose Spalding Ltd | Real estate | 2020 |
| Harrison's Electronic Services Ltd | Wholesale & retail | 2020 |
| Harrox Solutions Limited | Information & communication | 2024 |