| Hesterhouse RTM Company Limited | Households | 2006 |
| Hgeg Holdings (UK) Limited | Financial services | 2023 |
| Higher Park Dairy Limited | Agriculture & fishing | 2016 |
| Higher Sandhills Farm Limited | Extraterritorial | 2022 |
| Highfield House Residential Care Home Limited | Health & social care | 2011 |
| Highgrove Dorset Ltd | Construction | 2016 |
| Highgrove Parks Limited | Real estate | 2018 |
| Highlife Living Ltd | Real estate | 2022 |
| Hike Business Solutions Limited | Administrative & support | 2012 |
| Hilbre Plumbing Ltd | Construction | 2024 |
| Hill Build Ltd | Construction | 2004 |
| Hillcroft Surgery Supplies Ltd | Wholesale & retail | 2014 |
| Hillgrove Flats Management Limited | Households | 1986 |
| Hillman Autos Ltd | Wholesale & retail | 2025 |
| Hinton Farm Limited | Agriculture & fishing | 1956 |
| Hippify Ltd | Wholesale & retail | 2024 |
| Hire HQ Software Ltd | Information & communication | 2024 |
| Hirst Hub Ltd | Wholesale & retail | 2025 |
| Hirsttcg Ltd | Wholesale & retail | 2026 |
| Hitech Racing Limited | Arts & recreation | 2006 |
| Hitek Asia Limited | Wholesale & retail | 2012 |
| HK Investments Somerset Ltd | Real estate | 2023 |
| Hobbs Enterprise (UK) Ltd | Administrative & support | 2012 |
| Hobbs Property Investments Ltd | Real estate | 2020 |
| Hodders Roofing Limited | Construction | 2013 |
| Hoddersroofingsw Ltd | Construction | 2019 |
| Hodson and SON Limited | Construction | 2026 |
| Hold Fast Property Investments Ltd | Real estate | 2022 |
| Holistic Healthcare Solutions Ltd | Administrative & support | 2020 |
| Holloway Insurance Services Limited | Financial services | 2018 |
| Holly Court (Wincanton) RTM Company Limited | Households | 2017 |
| Holly-Day Designs Ltd | Wholesale & retail | 2024 |
| Holm Heating & Plumbing Limited | Construction | 2005 |
| Holt Vision Limited | Arts & recreation | 2016 |
| Holywell Mill Management Company Limited | Professional & scientific | 1986 |
| Home Installation and Maintenance Ltd | Construction | 2014 |
| Home Interiors Centre Limited | Wholesale & retail | 2014 |
| Home Table Ltd | Hospitality | 2019 |
| Hoopers Court Management Company Limited | Real estate | 2000 |
| Hoptoad Enterprises Limited | Information & communication | 2006 |
| Hopton Court Management Company Limited | Households | 2021 |
| Horizon Peak Roofing Ltd | Construction | 2025 |
| Hornbeam Lane Developments Ltd | Construction | 2019 |
| Horrell and Horrell Ltd | Hospitality | 2023 |
| Hospitality UN Limited | Hospitality | 2018 |
| House Property Associates Limited | Administrative & support | 1997 |
| Houses of Somerset Ltd | Real estate | 2026 |
| HS Automotive Ltd | Wholesale & retail | 2025 |
| HT Travel Ltd | Transport & logistics | 2004 |
| Hulberts Court Management Company Limited | Real estate | 2017 |
| Humberts Yeovil Ltd | Real estate | 2020 |
| Hummingbird Homecare Yeovil Ltd | Health & social care | 2022 |
| Hunny Buzz Ltd | Arts & recreation | 2024 |
| Hurst Brook Management Ltd | Households | 2019 |
| Hutchings Music and Support Services Ltd | Administrative & support | 2026 |
| Huttay Limited | Real estate | 2024 |
| Hydrogen Online Limited | Information & communication | 2020 |
| Hydroline Holdings (SW) Limited | Financial services | 2019 |
| Hydroline Solutions Limited | Construction | 2011 |
| Hymerford Ltd | Extraterritorial | 2013 |
| I J H Executive Cars Ltd | Transport & logistics | 2015 |
| I W F D Limited | Professional & scientific | 2012 |
| I&M Training Limited | Education | 2019 |
| IAN Buck Limited | Administrative & support | 2013 |
| Ibrogen Limited | Health & social care | 2023 |
| Icah South Ltd | Health & social care | 2024 |
| Ichiban HK Limited | Hospitality | 2024 |
| IDJ Developments Limited | Construction | 2018 |
| IF YOU Don'T ASK Limited | Administrative & support | 2023 |
| IJH Executive Ltd | Professional & scientific | 2013 |
| Ilchester Cars Limited | Wholesale & retail | 2001 |
| Imagery Training Solutions Ltd | Public administration | 2020 |
| Immortal Sport Ltd | Arts & recreation | 2017 |
| IN Reality Ltd | Information & communication | 2018 |
| Inca Process Ltd | Professional & scientific | 2024 |
| Inglewood (Yeovil) Management Company Limited | Households | 1991 |
| Inglish Care Ltd | Administrative & support | 2025 |
| Inkling England Limited | Wholesale & retail | 2018 |
| Inky and Mole Online Ltd | Wholesale & retail | 2020 |
| Innocent Oceans Limited | Manufacturing | 2023 |
| Innovess Ltd | Health & social care | 2025 |
| Insider Tours, Limited | Administrative & support | 2003 |
| Insight- Educational Assessments and Send Consultancy Ltd | Education | 2025 |
| Inspired 4 Life Coaching Limited | Administrative & support | 2006 |
| Instyle Designs UK Ltd | Wholesale & retail | 2023 |
| Integrity Designs Ltd | Administrative & support | 2013 |
| Intelligent Guidance Limited | Professional & scientific | 2018 |
| Inti Services Limited | Health & social care | 2016 |
| Intricatehr Ltd | Administrative & support | 2024 |
| ION Assets Ltd | Real estate | 2021 |
| Ipsa One Ltd | Administrative & support | 2024 |
| IRL Services Limited | Information & communication | 2015 |
| Irwell Middlewood Ltd | Other services | 2024 |
| Irwell Properties Limited | Real estate | 2019 |
| Island Movies UK Limited | Information & communication | 2025 |
| IT Ambulance Limited | Information & communication | 2005 |
| IT Investing Ltd | Financial services | 2023 |
| IUC Ltd | Construction | 2025 |
| IVC Services Limited | Professional & scientific | 1997 |
| IVC Technologies EOT Trustees Limited | Professional & scientific | 2022 |