| Glastonbury Fire Safety Ltd | Public administration | 2019 |
| Glastonbury FM Community Interest Company | Information & communication | 2006 |
| Glastonbury Football Club Community Interest Company | Hospitality | 2023 |
| Glastonbury Incense Ltd | Wholesale & retail | 2022 |
| Glastonbury Information Centre Community Interest Company | Administrative & support | 2017 |
| Glastonbury Mural Trail CIC | Arts & recreation | 2021 |
| Glastonbury NUT Farm Ltd | Agriculture & fishing | 2024 |
| Glastonbury Online Limited | Information & communication | 2000 |
| Glastonbury Skip Hire Limited | Water & waste | 2012 |
| Glastonbury Spring Water Company Limited | Manufacturing | 1988 |
| Glastonbury Spring Water Holdings Limited | Extraterritorial | 2016 |
| Glastonbury TOR Estates Ltd | Real estate | 2009 |
| Glastonbury TOR Finance Ltd | Financial services | 2009 |
| Glastonbury Wood Fired Pizza Company Limited | Hospitality | 2013 |
| Global Cash Access (UK) Limited | Administrative & support | 2006 |
| Global Marine Equipment Limited | Public administration | 2022 |
| GMT Timber Frames Limited | Manufacturing | 2008 |
| Gnostic Communications Limited | Professional & scientific | 2016 |
| Goddess Temple Gifts Limited | Wholesale & retail | 2013 |
| Goddess Temple Pilgrimages Ltd | Administrative & support | 2023 |
| Gothic Image Ltd | Wholesale & retail | 2020 |
| Gothic Image Publications Ltd | Information & communication | 1998 |
| Gothic Image Tours of Ancient Britain Ltd | Administrative & support | 1998 |
| GQ Developments Limited | Real estate | 2021 |
| Graham Building & Developments Limited | Construction | 2002 |
| Green Media Limited | Manufacturing | 2019 |
| Green Power Generators (Two) Ltd | Energy | 2020 |
| Grenville Court Management (Butleigh) Limited | Households | 2014 |
| GRG Building & Developments Limited | Construction | 2013 |
| Ground and Wild Limited | Education | 2022 |
| Group JP Ltd | Financial services | 2025 |
| Grove Wellbeing CIC | Other services | 2024 |
| Grover Gray Holdings Limited | Real estate | 2014 |
| Grumpy Jedi Trading Limited | Real estate | 2015 |
| Gryphon Land Limited | Real estate | 2005 |
| GTD Lewis Limited | Other services | 2002 |
| Guerillateaching Ltd | Education | 2021 |
| GW 3L Cookswood Limited | Real estate | 2010 |
| GW3L Penhow Ltd | Construction | 2013 |
| H B Green & SON Limited | Agriculture & fishing | 2003 |
| H G Green Cheesemakers Limited | Real estate | 1975 |
| H.E.D. Fabrication Welding Services Limited | Manufacturing | 2017 |
| Hair by Chantel Ltd | Other services | 2025 |
| Hamletplace Limited | Real estate | 1985 |
| Harmony United Limited | Manufacturing | 2004 |
| Harris Moon Limited | Professional & scientific | 1994 |
| Haruka Limited | Wholesale & retail | 2009 |
| Haus of Castel Ltd | Real estate | 2024 |
| Havitor Limited | Administrative & support | 2026 |
| Hayes Tax Limited | Professional & scientific | 2000 |
| Healing Earth Ltd | Hospitality | 2015 |
| Health Professional (Somerset) Limited | Administrative & support | 2006 |
| Hear 4 the Long Term Ltd | Health & social care | 2024 |
| Heart of the Tribe Ltd | Arts & recreation | 2018 |
| Hedge Monkey Hair Limited | Other services | 2013 |
| HEG Limited | Construction | 2006 |
| Helix Cabinet Makers Ltd | Manufacturing | 2019 |
| HER Path of Love Limited | Education | 2013 |
| Heriz Payne Limited | Professional & scientific | 2002 |
| Heythats Limited | Wholesale & retail | 2021 |
| Hide and Sheep Limited | Wholesale & retail | 1961 |
| Highgate Hotels International Ltd. | Hospitality | 2015 |
| Hightale Limited | Information & communication | 1998 |
| Hillcrest KOI Ltd | Manufacturing | 2026 |
| Hillyers Houses Ltd | Construction | 2003 |
| Hito Sushi & More by Nikola Grzesik Ltd | Hospitality | 2022 |
| Hito Sushi & More Ltd | Hospitality | 2022 |
| HMO Renovation Project Management Bristol Limited | Construction | 2024 |
| Holland Properties (SW) Limited | Real estate | 2026 |
| Homefields Management Company Limited | Households | 1994 |
| Hounduk Ltd | Wholesale & retail | 2021 |
| House of Sovren Ltd | Information & communication | 2025 |
| Hownor Holdings Ltd | Real estate | 2017 |
| HSK Events Limited | Information & communication | 2026 |
| Hugh Adlam Architects Ltd | Professional & scientific | 2009 |
| Human Potential Development Limited | Professional & scientific | 1988 |
| Hygienic Compliance Engineering Ltd | Professional & scientific | 2026 |
| Hypnotion Ltd | Administrative & support | 2025 |
| I J Eddy Limited | Construction | 2004 |
| I.S.A Carpentry Ltd | Construction | 2017 |
| IAN Jeanes Limited | Construction | 2004 |
| Inn Glastonbury Limited | Households | 2013 |
| Intelegen Limited | Energy | 2022 |
| Intergalactic Cristal & Collectibles Ltd | Wholesale & retail | 2025 |
| Iris Designed Limited | Arts & recreation | 2012 |
| Iris Farm Agroforestry Ltd | Agriculture & fishing | 2024 |
| Isabella Thomas Beauty & Well -Being Limited | Other services | 2024 |
| IT Backbones Limited | Information & communication | 2004 |
| J & E Construction (South West) Limited | Construction | 2015 |
| J & E Plumbing & Heating Engineers Ltd | Construction | 2024 |
| J & S M Rowland & Sons Limited | Agriculture & fishing | 2006 |
| J34 Architecture Ltd | Professional & scientific | 2025 |
| Jacks Close Management Limited | Households | 2009 |
| Jadlam Holdings Limited | Financial services | 2021 |
| Jadlam Racing Limited | Wholesale & retail | 1987 |
| Jahl Limited | Professional & scientific | 2007 |
| Jamborghini Ltd | Financial services | 2025 |
| James Bolton Agricultural Contracting Ltd | Agriculture & fishing | 2007 |
| James Cameron Carter Limited | Manufacturing | 2023 |
| James Wilkins Plumbing and Heating Ltd | Construction | 2014 |