| Greenway Travel Limited | Transport & logistics | 2013 |
| Greenwood Facilities Management Limited | Households | 2025 |
| Gregory Agri Limited | Agriculture & fishing | 2012 |
| Gregory Automotive Limited | Wholesale & retail | 2026 |
| Greig & Allen (Bridport) Ltd | Wholesale & retail | 2007 |
| Grey's Field Management Company Limited | Households | 2014 |
| Greyhound Inn Limited | Hospitality | 2019 |
| Grip-Tec Limited | Wholesale & retail | 2021 |
| Gromedia Web Agency Ltd | Information & communication | 2017 |
| Group of EX Ltd | Professional & scientific | 2025 |
| Gruner Teufel Aerospace Ltd. | Manufacturing | 2007 |
| Gsltool Limited | Extraterritorial | 2012 |
| Guardlink Ltd | Administrative & support | 2026 |
| Gubbins Management Ltd | Hospitality | 2023 |
| Guest Fire and Security Limited | Construction | 2017 |
| GUL UK Catering Ltd | Hospitality | 2021 |
| GUY Dennler Antiques Ltd | Wholesale & retail | 2025 |
| GUY Dennler LLP | | 2010 |
| GWD Property Consultants LLP | | 2016 |
| Gwengmac Ltd | Health & social care | 2023 |
| Gymyeovil Ltd | Arts & recreation | 2020 |
| H & C Rental Properties Ltd | Real estate | 2024 |
| H & H Cleaning Ltd | Administrative & support | 2023 |
| H K Trailers Limited | Manufacturing | 2021 |
| H S Supplies LP | | 2006 |
| H Surgery LP | | 2006 |
| H&A Heating and Plumbing Limited | Construction | 2024 |
| H&D Property Group Ltd | Real estate | 2021 |
| H.M. Kennedy Limited | Professional & scientific | 2024 |
| HAC Asset Management Limited | Professional & scientific | 2017 |
| Hadleigh Construction Group Ltd | Construction | 2024 |
| Hadleigh Decorator's Ltd | Construction | 2022 |
| Hadleigh Group Holdings Ltd | Financial services | 2025 |
| Hadleigh Projects Ltd | Construction | 2025 |
| Hafkk Limited | Real estate | 2023 |
| Hakuna Matata Grills Ltd | Hospitality | 2025 |
| Halfway House Inn Yeovil Ltd | Hospitality | 2023 |
| Hallett Properties Limited | Construction | 2016 |
| Halstock Cabinet Makers Ltd | Manufacturing | 1994 |
| Halstock Village Shop Limited | Wholesale & retail | 1991 |
| Hamcapital Limited | Professional & scientific | 2022 |
| Hamdon Property Company Limited | Financial services | 1950 |
| Hamilton Wealth Planning Limited | Professional & scientific | 2022 |
| Hammerstein Auctions Ltd | Wholesale & retail | 2014 |
| Handyhope CIC | Wholesale & retail | 2025 |
| Hannah MR Limited | Professional & scientific | 2023 |
| Happy Nails 68 Ltd | Other services | 2024 |
| Happy Orders Limited | Hospitality | 2024 |
| Happy Rabbit Limited | Agriculture & fishing | 2003 |
| Happyhellie Limited | Hospitality | 2023 |
| Hapscourt Limited | Information & communication | 1989 |
| Harcourt Facilities Limited | Administrative & support | 2002 |
| Hardington Project Management Limited | Professional & scientific | 2013 |
| Harlequin Consultancy Ltd | Construction | 2021 |
| Harlequin Scaffolding SW Limited | Construction | 2017 |
| Harmony Fire Limited | Professional & scientific | 2016 |
| Harpenden Osteopaths Ltd | Health & social care | 2010 |
| Harper Dolman & West Insurance Limited | Financial services | 2010 |
| Harrabella Sports Ltd | Construction | 2018 |
| Harris Fowler (Property Services) Limited | Real estate | 2010 |
| Harris Fowler Investments Ltd | Financial services | 2023 |
| Harris Fowler Thailand Ltd | Real estate | 2023 |
| Harry Lime Limited | Real estate | 2005 |
| Harry Spinks Farrier Limited | Other services | 2018 |
| Harry Toppers Ltd | Wholesale & retail | 2025 |
| Hartley Syme Consulting Limited | Administrative & support | 2010 |
| Hatton-Woods Properties Limited | Construction | 2004 |
| Hautbois Trading Company Limited(The) | Agriculture & fishing | 1960 |
| Haven Athletic Ltd | Other services | 2025 |
| Hawkefield Limited | Administrative & support | 2014 |
| Hawkins Haulage (South West) Ltd | Transport & logistics | 2019 |
| Haynes Developments and Construction Ltd | Construction | 2023 |
| Haynes Developments Holdings Ltd | Construction | 2022 |
| Haynes Developments Limited | Construction | 1964 |
| Hayward Building & Renovation Ltd | Construction | 2026 |
| Hazelgrove Construction Limited | Construction | 2014 |
| HB Specialist Dental Care Ltd | Health & social care | 2011 |
| HC Aviation Limited | Professional & scientific | 2003 |
| HCR Trading Limited | Wholesale & retail | 2012 |
| Healthy Habits Ltd | Wholesale & retail | 2020 |
| Heat-Tech South West Limited | Construction | 2003 |
| Heatfluence Limited | Construction | 2022 |
| Hebenezer Consulting Ltd | Health & social care | 2021 |
| Hedgerow & Petals Ltd | Manufacturing | 2015 |
| Helagon Ltd | Public administration | 2020 |
| Heliatech Services Limited | Administrative & support | 2016 |
| Helixadvisory Limited | Professional & scientific | 2023 |
| Hellier Asset Management Limited | Professional & scientific | 2012 |
| Hellier Capital Holdings Limited | Professional & scientific | 2014 |
| Hellier Group Holdings Limited | Financial services | 2021 |
| Hellier Trading Group Limited | Financial services | 2021 |
| Hello Care Ltd | Health & social care | 2025 |
| Help ME Help ME Ltd | Information & communication | 2009 |
| Hendford Springs Management Company Ltd | Households | 2017 |
| Hendy & Endy Properties Ltd | Real estate | 2022 |
| Henry & Sons Motor Engineers Ltd | Wholesale & retail | 2024 |
| HER Society CIC | Health & social care | 2026 |
| Herb Properties Limited | Construction | 2025 |
| Hergli & Sons Ltd | Real estate | 2025 |
| Heritage Heating & Plumbing Services Ltd | Other services | 2017 |