| Gordon Stoker and SON Limited | Wholesale & retail | 2000 |
| Governance Publishing and Information Services Limited | Administrative & support | 2000 |
| Goviers Properties(Taunton) Limited | Real estate | 1963 |
| Graham DEY Limited | Wholesale & retail | 2019 |
| Granny Smiths Limited | Wholesale & retail | 2003 |
| Grav-Engineering Limited | Professional & scientific | 2022 |
| Great Road Journeys Ltd | Administrative & support | 2007 |
| Green Gold Energy Limited | Professional & scientific | 2006 |
| Green Gold Fuels Limited | Professional & scientific | 2006 |
| Greenway Court (Taunton) Management Company Limited | Households | 1974 |
| Grocery Group Ltd | Wholesale & retail | 2026 |
| Grove Court (Burnham-On-Sea) Maintenance Company Limited | Households | 1977 |
| Grove House (Bath) Management Company Limited | Real estate | 1999 |
| Grundon Technologies Limited | | 1986 |
| GT Healthcare Limited | Administrative & support | 1999 |
| Gumbrell's Motors Limited | Wholesale & retail | 1946 |
| Gwilliams of Edington Limited | Wholesale & retail | 1964 |
| H & C Coachbuilders Ltd. | Manufacturing | 1996 |
| H Tredwin & SON Limited | Other services | 2002 |
| H. Biffen and Sons Limited | Other services | 1946 |
| H. M. Electrical Services (1996) Limited | Construction | 1997 |
| H.M. Testing Services & Consulting Limited | Information & communication | 2007 |
| Hair Venue Limited | Other services | 2007 |
| Hall Brother Sauna Company Ltd | Health & social care | 2024 |
| Hallco 367 Limited | Construction | 2000 |
| Hallmark Conservatories & Windows Limited | Wholesale & retail | 2002 |
| Hamdon Financial Services Limited | Financial services | 1996 |
| Hanging About Limited | Other services | 2004 |
| Hard Acre Estates Limited | Real estate | 2007 |
| Harmony Developments Limited | Construction | 2004 |
| Harriet Mind and Body Ltd | Information & communication | 2026 |
| Hatcher and Sons,Limited | Wholesale & retail | 1898 |
| Hayne Consulting Limited | Professional & scientific | 2005 |
| Haynes Group Limited | Financial services | 1960 |
| Hazel Prior Ltd | Arts & recreation | 2018 |
| HB Golf Solutions Ltd | Wholesale & retail | 2025 |
| Head Hunters UK Limited | Administrative & support | 2005 |
| Heal Developments Limited | Real estate | 2016 |
| Hedley Price Funeral Directors Limited | Other services | 1998 |
| Helliar and Childs Limited | Administrative & support | 2002 |
| Henley Grove Farm Limited | Agriculture & fishing | 2006 |
| Henrietta Estates Limited | Professional & scientific | 1994 |
| Heritage Window Consultancy Ltd | Professional & scientific | 2016 |
| Hi-Speed Logistics Limited | Transport & logistics | 2016 |
| Higgs Property Investments Limited | Real estate | 2009 |
| Highdale Court (Maintenance) Limited | Households | 1973 |
| Highview Service Station Limited | Wholesale & retail | 2002 |
| Hill House Services Management Company Limited | Households | 2006 |
| HK Mirador Ltd | Hospitality | 2023 |
| HLC Aesthetics Limited | Other services | 2021 |
| Holywell Care Limited | Health & social care | 2022 |
| Home Transfer Limited | Extraterritorial | 2007 |
| HOME2BUILDERS Limited | Construction | 2007 |
| Honey's Hair & Beauty Salons Limited | Other services | 2003 |
| Honsea Technology Ltd | Wholesale & retail | 2021 |
| Hopcraft Limited | Agriculture & fishing | 1996 |
| Horatio (Genius for Hire) Limited | Information & communication | 2014 |
| Hornbeam Property Management Limited | Real estate | 2018 |
| House of Allington Limited | Wholesale & retail | 2000 |
| Household Comforts Limited | Wholesale & retail | 2002 |
| Hovelands Court (Taunton) Limited | Households | 2000 |
| Hovelands Limited | Wholesale & retail | 1986 |
| Howetown Farm Limited | Agriculture & fishing | 1997 |
| Hoyle System Design Services Limited | Information & communication | 1994 |
| HP Resources Limited | Professional & scientific | 2003 |
| HTS (Yeovil) Management Company Limited | Households | 2002 |
| Huckle Property Limited | Real estate | 2014 |
| Hugh Rose Developments Limited | Real estate | 2006 |
| Hugh Rose Properties Limited | Real estate | 2006 |
| Huiyue Technology Co., Ltd. | Extraterritorial | 2021 |
| Huntham Farm Ltd | Agriculture & fishing | 2003 |
| Hurrellit Limited | Information & communication | 2006 |
| Huskcroft Limited | Arts & recreation | 1977 |
| Hydrax Limited | Manufacturing | 1983 |
| I C Management Solutions Limited | Professional & scientific | 2006 |
| Idlewild Publishers Ltd | Information & communication | 2013 |
| IJT Direct Limited | Wholesale & retail | 2005 |
| Ilikemyquality Ltd | Administrative & support | 2015 |
| Industrial Tyre Services Ltd | Wholesale & retail | 2000 |
| Infinite I.T. Limited | Manufacturing | 2001 |
| Innox Hill Community Association Ltd | Other services | 2004 |
| Inspiration 4 Floors & Blinds Ltd. | Construction | 2006 |
| Install Electrical (Wells) Limited | Construction | 1997 |
| Integrity Management (Management Consultancy) Limited | Professional & scientific | 2007 |
| Intellisyl Limited | Professional & scientific | 2002 |
| Invest Southwest Limited | Professional & scientific | 2006 |
| Inwood Plastics Reclamation Limited | | 1984 |
| Islandmonkey Limited | Information & communication | 2007 |
| Isle of Wedmore Golf Club Limited | Arts & recreation | 1991 |
| Israel Airuit International Agricultural Technology (Group) Co., Ltd | Extraterritorial | 2023 |
| Israel Brant Group Biology Co., Ltd | Extraterritorial | 2023 |
| Istanbbul Barber Shop Ltd | Other services | 2024 |
| ITX Computer Services Limited | Information & communication | 2008 |
| IV League Limited | Hospitality | 2000 |
| J Burgess Electrical Services Limited | Construction | 2002 |
| J N Refrigeration Limited | Manufacturing | 1996 |
| J. Corke Ltd | Professional & scientific | 2002 |
| J.D. Pope & Sons Limited | Administrative & support | 2001 |
| J.H.Haskins & SON Limited | Real estate | 1957 |
| J.M.F. Property Services Limited | Construction | 2007 |