| GAM Management Ltd | Extraterritorial | 2020 |
| Gardenevolution Limited | Administrative & support | 2024 |
| GBM Metal Recycling Ltd | Wholesale & retail | 2025 |
| GBM Metals Recycling Limited | Wholesale & retail | 2026 |
| GBM Plant Services Limited | Administrative & support | 2026 |
| Gcog Ltd | Information & communication | 2016 |
| Gemini Tackle Co. Limited | Wholesale & retail | 1990 |
| Geokai Ltd | Information & communication | 2020 |
| German Experts on Demand Ltd | Administrative & support | 2009 |
| German Kitchens Beverley Ltd | Wholesale & retail | 2015 |
| Gill & Gardiner Commercial Ltd | Real estate | 2018 |
| Gill & Gardiner Holdings Limited | Wholesale & retail | 2021 |
| Girsby Farm Services Ltd | Agriculture & fishing | 2017 |
| Global Body Armour Ltd | Wholesale & retail | 2022 |
| Global Pharma Consulting Limited | Professional & scientific | 2005 |
| Global Toys Limited | Wholesale & retail | 2021 |
| GNE Services Ltd | Professional & scientific | 2019 |
| Go Electric Ltd | Manufacturing | 2017 |
| Goldcrest Properties (Lincolnshire) Limited | Real estate | 2007 |
| Graceful Care Solutions Ltd | Health & social care | 2025 |
| Graham Arnold Limited | Construction | 2009 |
| Graham Davis (Commercials) Limited | Wholesale & retail | 2000 |
| Great British Produce Limited | Manufacturing | 2010 |
| Green Dolphin Cleaning Limited | Administrative & support | 2010 |
| Green Dolphin Limited | Administrative & support | 2010 |
| Green Earth Energy Limited | Wholesale & retail | 2020 |
| Greenacres Care Limited | Health & social care | 2020 |
| Group 2 Properties Limited | Real estate | 2003 |
| Grove Farm (Lincs) Limited | Agriculture & fishing | 2005 |
| GRS Fabrications Limited | Manufacturing | 2014 |
| Gtux Ltd | Information & communication | 2014 |
| Guardian Risk Ltd | Information & communication | 2025 |
| Guarin Simpson Motor Sport Limited | Arts & recreation | 2004 |
| H & M Haylage Limited | Administrative & support | 2020 |
| H C Solutions Limited | Extraterritorial | 2009 |
| H C Wright Limited | Transport & logistics | 2002 |
| H Enterprises Limited | Other services | 2002 |
| H Shepherd Developments Ltd | Construction | 2020 |
| H Ward Farming Limited | Agriculture & fishing | 2015 |
| H-S Turbines Ltd | Professional & scientific | 2023 |
| H. D. Drilling Services Limited | Extraterritorial | 2016 |
| H.O.C. Food Machinery Limited | Professional & scientific | 2008 |
| H.R Bourn & Sons (Linwood) Limited | Agriculture & fishing | 1999 |
| H40 Consulting Limited | Wholesale & retail | 2008 |
| Habitat Property Investment Limited | Real estate | 2015 |
| Hainton Enterprises Limited | Agriculture & fishing | 2012 |
| Haletta Properties Ltd | Real estate | 2017 |
| Hall Farm Holidays Limited | Hospitality | 2021 |
| Hall Farm Pool Limited | Arts & recreation | 2018 |
| Hall Farm Stables Limited | Agriculture & fishing | 2021 |
| Halo Hair & Beauty Limited | Other services | 2011 |
| Hamilton Studios Ltd | Construction | 2016 |
| Hand Property Investments Ltd | Real estate | 2025 |
| Hans-Lec Design Ltd | Administrative & support | 2008 |
| Hansei Ltd | Professional & scientific | 2020 |
| Happy Hooves Lincs C.I.C. | Health & social care | 2015 |
| Harper-Smith Lane Management Company Ltd | Households | 2025 |
| Harry Plant Hire Limited | Construction | 2017 |
| Harvey Bros Livestock Limited | Wholesale & retail | 2004 |
| Haslam’S Properties Ltd | Real estate | 2025 |
| Haspen Ltd | Wholesale & retail | 2026 |
| Hawkgate Limited | Real estate | 2000 |
| Haywood Homes Limited | Administrative & support | 2022 |
| Hazdog Ltd | Agriculture & fishing | 2026 |
| Hazera Seeds UK Ltd | Other services | 1996 |
| HCS Associated Services Limited | Extraterritorial | 2015 |
| HD Refrigeration Limited | Construction | 2014 |
| Heating & Plumbing Solutions (Market Rasen) Limited | Construction | 2006 |
| Heatlinc Ltd | Construction | 2023 |
| Helethorpe Farming Ltd | Agriculture & fishing | 2024 |
| Hemco Developments Limited | Real estate | 2011 |
| Hemswell Business Park Management Company Limited | Real estate | 2012 |
| Hemswell Estates Limited | Real estate | 2003 |
| Hemswell Power Partnership LLP | | 2012 |
| Heneage Arms Limited | Extraterritorial | 2023 |
| Heritage Windows and Joinery Ltd | Manufacturing | 2025 |
| Herring Farms Limited | Agriculture & fishing | 2019 |
| High Court Solutions Limited | Professional & scientific | 2013 |
| Hillen 1701 Ltd | Construction | 2025 |
| Hillen Ltd | Construction | 2011 |
| Hillside Engineering Limited | Professional & scientific | 2023 |
| Hirem Abiff Limited | Extraterritorial | 2022 |
| Hive Internet Limited | Information & communication | 1999 |
| HJM Transport Consultancy Services Limited | Transport & logistics | 2018 |
| Holben Property Ltd | Real estate | 2024 |
| Homelet 1970 Limited | Real estate | 2025 |
| Hope Fields Management Company Ltd | Households | 2023 |
| Horton Software Engineering Limited | Information & communication | 1990 |
| Houltby Company Ltd | Administrative & support | 2023 |
| HOW Properties Ltd | Real estate | 2020 |
| Howard Belt Wealth Management Limited | Financial services | 2025 |
| HRA Property Focus Limited | Real estate | 2025 |
| HRA Total Services Limited | Administrative & support | 2025 |
| HTC Consultancy Limited | Professional & scientific | 2016 |
| Hubstone Limited | Professional & scientific | 2005 |
| Huckers Motor Services Barton Limited | Wholesale & retail | 2023 |
| Huckers Motor Services Stallingborough Limited | Wholesale & retail | 2023 |
| Human Magic Ltd | Professional & scientific | 2026 |
| Hunter Waste Limited | Water & waste | 2014 |
| Hutchinson Consultants Limited | Information & communication | 2011 |