| Heighway Group Ltd | Financial services | 2025 |
| Heighway Plant Limited | Administrative & support | 2025 |
| Herbfarmacy Skincare Ltd | Wholesale & retail | 2024 |
| Heritium Ltd | Professional & scientific | 2014 |
| Heron Medical Ltd | Health & social care | 2024 |
| HEX Infrastructure Limited | Information & communication | 2026 |
| HI HO Silver Limited | Extraterritorial | 2007 |
| Hicks Property Services Limited | Real estate | 1991 |
| Historic Helicopters | Manufacturing | 2020 |
| Hogarth Way Design Ltd | Construction | 2021 |
| Holbear Grange Management Company Limited | Real estate | 2007 |
| Holditch Court (Farms) Limited | Agriculture & fishing | 2004 |
| Hollandandco.Chard Ltd | Real estate | 2025 |
| Holy Cross Healthcare Ltd | Administrative & support | 2026 |
| Holyrood Mews Management Company Limited | Households | 2011 |
| Homeleigh Health Services Limited | Health & social care | 2026 |
| Homka Retail Ltd | Wholesale & retail | 2020 |
| Hornsbury Haylage & Animal Feeds Ltd | Agriculture & fishing | 2018 |
| Hounsell & Harding Ltd | Construction | 2014 |
| Housing Data LAB Ltd | Professional & scientific | 2018 |
| Howards Mini Market Ltd | Wholesale & retail | 2026 |
| Howards Mini Store Ltd | Wholesale & retail | 2025 |
| Huangchu Limited | Hospitality | 2026 |
| Huffer 2010 LP | | 2010 |
| Huish Flats Limited | Households | 1999 |
| Hurrell Developments Limited | Real estate | 2014 |
| Hyams & Partridge Electrical Contractors Ltd | Extraterritorial | 2013 |
| Hyde Court Management (Yeovil) Limited | Real estate | 2000 |
| Hyper-Mouse Ltd | Information & communication | 2014 |
| Iabs, Business Services Ltd | Wholesale & retail | 2019 |
| Iamdecor Ltd | Manufacturing | 2021 |
| Ichigo Consulting Ltd | Information & communication | 2012 |
| Ichigo Trading Limited | Wholesale & retail | 2012 |
| IDH Builders Ltd | Construction | 2016 |
| Ikigai Ventures Limited | Administrative & support | 2011 |
| Ingenio Studios Ltd | Professional & scientific | 2026 |
| Inspired Metal Ltd | Manufacturing | 2012 |
| Integra Property Developments Ltd | Real estate | 2026 |
| Irvin Nutt South West Planers Limited | Construction | 2016 |
| Iuvara Ltd | Information & communication | 2026 |
| Ivel Court Limited | Households | 1983 |
| J B Wheaton and Sons Depot & Warehouse Services LLP | | 2013 |
| J D OIL Services Limited | Construction | 2013 |
| J M Farrington Property Maintenance & Plumbing Limited | Construction | 2016 |
| J Steve Jones LP | | 2012 |
| J.B. Wheaton and Sons Limited | Transport & logistics | 1988 |
| J.M. 2014. LP | | 2014 |
| J.Pope Services Limited | Professional & scientific | 2010 |
| Jacob Chalon Kitchens Ltd | Manufacturing | 2019 |
| Jaguar Interiors Ltd | Professional & scientific | 2025 |
| JAK Rentals Limited | Real estate | 2008 |
| Jarvis Bagshaw Ltd | Professional & scientific | 2012 |
| Jasper Scaffolding Ltd | Construction | 2011 |
| Jaxli Property Group Ltd | Real estate | 2025 |
| Jdzscao Ltd | Real estate | 2025 |
| Jennings Industries Limited | Professional & scientific | 1959 |
| JJM Management Ltd | Real estate | 2020 |
| JJN2J Ltd | Wholesale & retail | 2025 |
| JK Aviation Ltd | Manufacturing | 2016 |
| JLMR.2015. LP | | 2017 |
| JM Truck Repairs Ltd | Wholesale & retail | 2025 |
| Jmdcarolina Ltd | Hospitality | 2019 |
| Jobson Medical Services Limited | Health & social care | 2017 |
| JON Matherick Building Contractor Limited | Construction | 2016 |
| JSG Communications Ltd | Information & communication | 2019 |
| JSG Fire & Security Ltd | Administrative & support | 2020 |
| JSG South West Ltd | Professional & scientific | 2024 |
| Jubatus Expedition Medics Limited | Administrative & support | 2018 |
| Juno Dp&P Ltd | Extraterritorial | 2024 |
| Jurassic Health Limited | Health & social care | 2023 |
| K.L. Construction (SW) Limited | Construction | 2009 |
| KD Design & Fabrication Limited | Manufacturing | 2002 |
| Kddf Ltd | Construction | 2012 |
| KG Kingston Limited | Administrative & support | 2008 |
| Kilworth Business and Properties Limited | Real estate | 2006 |
| Kinetics Physiotherapy Ltd | Other services | 2025 |
| Kingswick Properties Limited | Other services | 1987 |
| KM Weld Inspection Limited | Professional & scientific | 2024 |
| Kneesmith Ltd | Health & social care | 2019 |
| Kontago Limited | Professional & scientific | 2013 |
| Kotla Consulting Services Limited | Information & communication | 2025 |
| KW.2018. LP | | 2018 |
| L J Bland Ltd | Health & social care | 2021 |
| Laegency Ltd | Professional & scientific | 2024 |
| Lamj Ltd | Information & communication | 2023 |
| Langdons Way Management Company Limited | Households | 2017 |
| Larkyra Ltd | Arts & recreation | 2024 |
| Laserform HR Systems Limited | Information & communication | 2004 |
| Lawless Farm Ltd | Construction | 2025 |
| Lcgf Aircraft Services Ltd | Manufacturing | 2024 |
| Leamington Stone Limited | Real estate | 2005 |
| Learning Toys Ltd | Wholesale & retail | 2026 |
| LEE Church Street Management Limited | Households | 2014 |
| Lentells (Audit) Limited | Professional & scientific | 2023 |
| Lentells Estates and Probate Services Limited | Professional & scientific | 2018 |
| Lentells Limited | Professional & scientific | 2002 |
| Lewis Sales Services Limited | Wholesale & retail | 2006 |
| Lhlh Services Ltd | Health & social care | 2021 |
| Lighthouse Investments Limited | Real estate | 2016 |
| Lily Caring Angels Limited | Health & social care | 2013 |