| First Wind Film Development Ltd | Information & communication | 2016 |
| Flight Test Solutions Ltd | Professional & scientific | 2021 |
| Flydoo UK Ltd | Wholesale & retail | 2026 |
| Focus Crew Training Ltd | Transport & logistics | 2023 |
| FOE Clothing Ltd | Wholesale & retail | 2024 |
| Food Fore Thought (Surrey) Ltd | Administrative & support | 2015 |
| Forde Properties Limited | Real estate | 2022 |
| Forest Electrical Services Limited | Construction | 1995 |
| Forever Pleasure Company Limited | Professional & scientific | 2021 |
| Forrester Consultants Ltd | Professional & scientific | 2025 |
| Fortnum Place Management Company Limited | Real estate | 2002 |
| Frog Lane Management Company Limited | Households | 2011 |
| Frytak Ltd | Information & communication | 2017 |
| G R Farmer & Sons Limited | Agriculture & fishing | 2004 |
| G.A. Vowles Limited | Wholesale & retail | 1999 |
| Garmac Engineering Limited | Professional & scientific | 2018 |
| Gary Green Engineering Limited | Professional & scientific | 2012 |
| GEC Property Limited | Real estate | 2022 |
| Gemini Networks Limited | Information & communication | 2005 |
| Geoff Fowler Motors Ltd | Wholesale & retail | 2012 |
| George Bolt Rural Services Limited | Construction | 2025 |
| Gibster Ltd | Administrative & support | 2025 |
| Gisby Group International Limited | Administrative & support | 2011 |
| GKH Ltd | Construction | 2023 |
| Global Interiors Limited | Construction | 1983 |
| Goose Television Ltd | Information & communication | 2022 |
| Gorilla Byte Ltd | Information & communication | 2022 |
| Green Ilminster CIC | Education | 2022 |
| Green Irrigation Ltd | Professional & scientific | 2017 |
| Green Irrigation Supplies Ltd | Wholesale & retail | 2019 |
| GT Property Holdings South West Limited | Real estate | 2025 |
| Guild of Sage and Smith Limited | Professional & scientific | 2021 |
| Guzzbury Limited | Information & communication | 2018 |
| H.Trotter Electrical Limited | Construction | 2026 |
| Hallshire Limited | Information & communication | 2023 |
| Hanning Management Company Limited | Professional & scientific | 2001 |
| Harlequin Carnival Club Ltd | Other services | 2016 |
| Harmony Health & Beauty (South West) Limited | Other services | 2003 |
| Harriet Whinney Pearls Limited | Manufacturing | 2006 |
| Harry FRY Racing Limited | Agriculture & fishing | 2013 |
| Harvard Claims Ltd | Administrative & support | 2017 |
| Hawkins Bakery Computer Services Limited | Information & communication | 1980 |
| Hawkins Lott Ltd | Real estate | 2020 |
| Hazel & Brown Ltd | Construction | 2025 |
| Hazelford Limited | Information & communication | 1999 |
| HCP Cables Limited | Wholesale & retail | 2003 |
| Helping Hands (South West) Limited | Construction | 2023 |
| Henley Gardens Management Company Limited | Real estate | 2013 |
| Hepburn Spa & Associated Services Ltd | Other services | 2018 |
| Heppell Photonics Ltd | Professional & scientific | 2023 |
| Heritage Cider Limited | Manufacturing | 2023 |
| High Swallows Limited | Professional & scientific | 2012 |
| Higher Meadow Management Company Limited | Households | 2016 |
| Holistic Healthcare Ltd. | Health & social care | 2013 |
| Hollard Carpentry Ltd | Construction | 2025 |
| Hollyelliott Limited | Wholesale & retail | 2025 |
| Home Care 365 (SW) Ltd | Construction | 2025 |
| Home of Awakening Ltd | Administrative & support | 2022 |
| Homefield Equestrian Limited | Agriculture & fishing | 2020 |
| Homes U Control Limited | Information & communication | 2016 |
| Homethos Limited | Real estate | 2011 |
| Hornshay Barns Management Company Limited | Households | 2015 |
| Houlston Blakemore Limited | Wholesale & retail | 2004 |
| Howe Tree Surgery Ltd | Agriculture & fishing | 2020 |
| HQ Trading Company Limited | Wholesale & retail | 2019 |
| HRF Business Solutions Limited | Agriculture & fishing | 2017 |
| Human Design Films Limited | Manufacturing | 2004 |
| Hurdle Health Ltd | Health & social care | 2025 |
| Hush Limited | Information & communication | 2001 |
| HW Aviation Solutions Ltd | Administrative & support | 2026 |
| ICC1860 Ltd | Other services | 2020 |
| Iconography Limited | Information & communication | 1997 |
| Idris Stays Ltd | Hospitality | 2022 |
| Ikao Services Ltd | Wholesale & retail | 2022 |
| Ilford Bridges Farm Company | Extraterritorial | 1977 |
| Ilminster & District Carnival Committee Limited | Arts & recreation | 1994 |
| Ilminster Cricket Club | Arts & recreation | 2020 |
| Ilminster Emporium Ltd | Wholesale & retail | 2019 |
| Ilminster Entertainments Society Limited | Arts & recreation | 1985 |
| Ilminster Forum Ltd | Other services | 2007 |
| Ilminster Sports Club Limited | Arts & recreation | 2015 |
| Ilminster Wellbeing LLP | | 2018 |
| Ilton Estates Limited | Real estate | 1966 |
| Incose UK | Other services | 1998 |
| Industrial Drive Engineering Ltd | Manufacturing | 2022 |
| INFL8 Ltd | Real estate | 2009 |
| Inge Nielsen Ltd | Wholesale & retail | 2019 |
| Investor Acuity Limited | Information & communication | 2016 |
| Isca Web Design Limited | Professional & scientific | 2003 |
| Isle Property Services Ltd | Real estate | 2021 |
| J Beauchamp Ltd | Professional & scientific | 2013 |
| J H Maritime Limited | Administrative & support | 2001 |
| J S Hannam Ltd | Construction | 2021 |
| J. Brake & SON Limited | Wholesale & retail | 1997 |
| Jasper Entertainments Limited | Wholesale & retail | 2021 |
| Jean's Motor Care Limited | Wholesale & retail | 2025 |
| Jfdit Solutions Limited | Information & communication | 2019 |
| Jimmy London's Ltd | Construction | 2019 |
| JKC Services Ltd | Manufacturing | 2025 |
| JMK Coaching & Consultancy Limited | Professional & scientific | 2018 |