| Homes in Somerset Limited | Hospitality | 2005 |
| Homeway Developments Limited | Construction | 2016 |
| Honourable Banking | Information & communication | 2009 |
| Hooks Auto Works Ltd | Wholesale & retail | 2022 |
| Hoppo Limited | Professional & scientific | 2019 |
| Horseshoe Property Management (Bridgwater) Limited | Hospitality | 1990 |
| Hospitality Innovations Group Limited | Hospitality | 2025 |
| Hot OFF the Laser Ltd | Wholesale & retail | 2026 |
| Hot TUB Hire Somerset Limited | Administrative & support | 2026 |
| House & Sons Limited | Agriculture & fishing | 2017 |
| House Family Partnership LLP | | 2024 |
| House Group Limited | Financial services | 2025 |
| House Investments Group Limited | Professional & scientific | 2025 |
| House Leisure & Developments Limited | Hospitality | 2025 |
| HOW to Happy Limited | Other services | 2017 |
| Howard Dodd Consultancy Limited | Professional & scientific | 2004 |
| HOZ E Kausar Ltd | Wholesale & retail | 2024 |
| HQ Mortgage & Finance Limited | Financial services | 2008 |
| Hqmf Holdings Limited | Financial services | 2022 |
| Hudson Training Solutions Ltd | Education | 2016 |
| Hughes Properties SW Ltd | Real estate | 2024 |
| Human Wellbeing Ltd | Health & social care | 2017 |
| Humanmind Health Limited | Health & social care | 2023 |
| Humble Storage Installer Ltd | Construction | 2025 |
| Hung Drawn & Gorgeous Limited | Manufacturing | 2021 |
| Hunganese Holdings Limited | Education | 2025 |
| Hunky Punk Limited | Manufacturing | 2019 |
| Hunter Resourcing Ltd | Administrative & support | 2020 |
| Huntworth Developments Ltd | Construction | 2018 |
| Hussain Locum Services Limited | Professional & scientific | 2010 |
| Hypercards Limited | Wholesale & retail | 2022 |
| I Payment Solutions Ltd | Information & communication | 2019 |
| I Safe Global Ltd | Construction | 2016 |
| I'M Your MAN Limited | Wholesale & retail | 2022 |
| IAN PAY Trading Limited | Agriculture & fishing | 2003 |
| IBN Noor Housing Ltd | Real estate | 2025 |
| Icsmcredit Ltd | Information & communication | 2025 |
| ID Technology Limited | Information & communication | 2011 |
| IDK Consult Ltd | Professional & scientific | 2019 |
| Ihh-Vac Limited | Manufacturing | 1996 |
| Iicc Holdings Limited | Real estate | 2025 |
| Iinaa Ltd | Real estate | 2025 |
| IL Property Services Limited | Construction | 2020 |
| Image Hub Limited | Manufacturing | 2014 |
| Imagedrive Limited | Real estate | 1987 |
| Imaging Services (Medical) South West Limited | Administrative & support | 2019 |
| Immostef UK Limited | Real estate | 2023 |
| Impact Golf Limited | Administrative & support | 2008 |
| Impact Interiors (WSM) Ltd | Professional & scientific | 2007 |
| Imperial (South West) Ltd | Real estate | 1985 |
| IMR Locums Express Ltd | Health & social care | 2022 |
| IN Harmony Nails Limited | Other services | 2018 |
| IN My Kitchen With YOU Ltd | Hospitality | 2026 |
| Inagold Ltd | Wholesale & retail | 2024 |
| Inaura School | Education | 2001 |
| Incedo Limited | Professional & scientific | 2017 |
| Inchmere Design Limited | Professional & scientific | 2005 |
| Inchmere Event Design Ltd | Professional & scientific | 2017 |
| Indemand Property Lettings Ltd | Real estate | 2024 |
| Indentify Limited | Wholesale & retail | 2020 |
| Indescribable Growth Ltd | Agriculture & fishing | 2024 |
| Industry Advantage Limited | Financial services | 2020 |
| Inex Access and Maintenance Limited | Construction | 2009 |
| Infinitas Consulting Limited | Professional & scientific | 2023 |
| Infinity Supplies Group Ltd | Construction | 2025 |
| Infraspace Ltd | Information & communication | 2023 |
| Ingenii Consulting Solutions Ltd | Professional & scientific | 2024 |
| Ingram Casting Solutions Limited | Professional & scientific | 2006 |
| Inhabit: Short Stays Limited | Hospitality | 2015 |
| Inkerman Court (Taunton) Management Company Limited | Real estate | 2004 |
| Innate Project Services Limited | Professional & scientific | 2023 |
| Inner Pathways Limited | Health & social care | 2024 |
| Innisfree Properties Limited | Real estate | 2002 |
| Innovate Properties South West Ltd | Real estate | 2024 |
| Innovative Build Ltd | Construction | 2024 |
| Input Data Services Limited | Manufacturing | 2006 |
| Inro Drinks (Abtec) Limited | Wholesale & retail | 2003 |
| Insight Southwest Ltd | Construction | 2025 |
| Insight Veterinary Services Limited | Professional & scientific | 2021 |
| Inspecty Ltd | Professional & scientific | 2009 |
| Inspire Build SW Ltd | Construction | 2017 |
| Inspired Schools Limited | Arts & recreation | 2018 |
| Inspired Somerset C.I.C. | Arts & recreation | 2015 |
| Inspired Somerset Community CIC | Other services | 2023 |
| Inspires Media Ltd | Professional & scientific | 2018 |
| Inspiring Building Limited | Construction | 2014 |
| Inspiring Coaching Limited | Education | 2014 |
| Instahaus Ltd | Construction | 2023 |
| INT 2 EXT Ltd | Construction | 2022 |
| Integrow Recruitment Solutions Ltd | Administrative & support | 2022 |
| Intellope Limited | Information & communication | 2019 |
| Intense Nutrients Limited | Wholesale & retail | 2014 |
| International Poultry Consultants Ltd | Professional & scientific | 2023 |
| Intouch Investments Limited | Financial services | 2002 |
| Inwood Workshop Limited | Wholesale & retail | 2022 |
| Ipaf Drivers Limited | Other services | 2013 |
| IPC Ground Work Ltd | Construction | 2025 |
| IQ Retails Limited | Hospitality | 2025 |
| Ireland Investments Ltd | Real estate | 2022 |
| Iris Bijoux Limited | Manufacturing | 2025 |