| Goldfinch Music Limited | Information & communication | 2017 |
| Good LAD Initiative CIC | Education | 2015 |
| Gralyn Ltd | Professional & scientific | 2021 |
| Grange Projects Limited | Real estate | 2012 |
| Grassroots Club Ltd | Information & communication | 2021 |
| Great Hampton Street (Quartz) Management Company Limited | Households | 2004 |
| Greengrass Holidays Ltd | Extraterritorial | 2024 |
| Ground Maintenance Limited | Construction | 2018 |
| Grow Neuro Psychology Practice Ltd | Health & social care | 2025 |
| Gyso Film Limited | Information & communication | 2023 |
| H B Psychology Services Ltd | Education | 2023 |
| Halobridge Limited | Professional & scientific | 2008 |
| Halracott Private Ltd | Professional & scientific | 2021 |
| Halstead Homes Limited | Real estate | 2006 |
| Hamdon Developments Ltd | Construction | 2022 |
| Hammett Associates Limited | Professional & scientific | 2005 |
| Hammett Financial Services Ltd. | Administrative & support | 2005 |
| Hammett Holdings Ltd | Financial services | 2018 |
| Hamnett House Limited | Hospitality | 2021 |
| Hancock Construction & Renovation Ltd | Construction | 2025 |
| Hancock Marine Services Ltd. | Administrative & support | 2006 |
| Hankin Construction & Joinery Ltd | Construction | 2018 |
| Hansfords (Seaton) Limited | Construction | 2008 |
| Happy Crab Lets Limited | Professional & scientific | 2015 |
| Hapton House Psychology Ltd | Health & social care | 2026 |
| Harbour Mews (Seaton) Management Company Limited | Extraterritorial | 2003 |
| Harcombe Engineering Limited | Construction | 1984 |
| Hartnell Retail Ltd. | Wholesale & retail | 2005 |
| Haven View Apartments Ltd | Households | 1998 |
| Hayes GAS Servicing Ltd | Manufacturing | 2019 |
| Hazelwood (Budleigh) Ltd | Households | 2023 |
| Healthy Mind Psychology Limited | Health & social care | 2019 |
| Heatwave Hot Sauces Ltd | Wholesale & retail | 2024 |
| Heighway Ltd | Construction | 2020 |
| Helen Jones Psychology Ltd | Education | 2024 |
| Heligo Limited | Real estate | 2017 |
| Help and Advice Plus Ltd | Extraterritorial | 2011 |
| Help! My Dog Ltd | Education | 2023 |
| Henners Consultancy Limited | Professional & scientific | 2022 |
| Hermon Hill NO64 RTM Company Limited | Households | 2017 |
| Herts Neuropsych Solutions LLP | | 2025 |
| Heyland and Benjamin Ltd | Manufacturing | 2024 |
| Highclyffe Court (Seaton) Limited | Real estate | 1985 |
| Holding Hope Therapies Ltd | Health & social care | 2021 |
| Holistic Digital Marketing Ltd | Professional & scientific | 2021 |
| Holm Projects Ltd | Construction | 2026 |
| Hong Kong Chinese Restaurant (Seaton) Limited | Hospitality | 2002 |
| Hort Sales Limited | Wholesale & retail | 2021 |
| Hot TAP Music Limited | Administrative & support | 1993 |
| Hounds of Love London Ltd | Other services | 2022 |
| Howard Consulting Ltd | Information & communication | 2025 |
| Howitt Close Freehold Limited | Real estate | 2021 |
| Howitt Close RTM Company Limited | Households | 2010 |
| Humphrey Renewables Ltd | Professional & scientific | 2026 |
| I:Four Management Company Limited | Households | 2005 |
| Icom Research | Information & communication | 2012 |
| Iconic Collectors Ltd | Professional & scientific | 2026 |
| ICT Property Ltd | Real estate | 2017 |
| Imagine Design Create Limited | Wholesale & retail | 2013 |
| IMG (SW) Limited | Real estate | 1999 |
| IN My Back Yard C.I.C. | Wholesale & retail | 2020 |
| Including YOU Limited | Education | 2010 |
| Independent Flooring Limited | Wholesale & retail | 2018 |
| Inkerman Court Management Company Limited | Households | 1988 |
| Inside OUT Films Limited | Information & communication | 2013 |
| Insightful Living Ltd | Health & social care | 2024 |
| Inspiring Connections South West CIC | Other services | 2022 |
| Intelligent Venues & Events Limited | Professional & scientific | 2018 |
| Interim Financial Personnel Limited | Professional & scientific | 2001 |
| Ipsychology Ltd | Health & social care | 2023 |
| Iroko Works Ltd | Information & communication | 2010 |
| Isabel Knight Ltd | Professional & scientific | 2013 |
| Itemdrop Ltd | Wholesale & retail | 2015 |
| Ivory House Management Company Ltd | Administrative & support | 2010 |
| Izzy Living Ltd | Education | 2017 |
| J & GA Properties Limited | Information & communication | 1996 |
| J & P M Limited | Professional & scientific | 2020 |
| J P Associates (Consultants) Ltd. | Professional & scientific | 2002 |
| J Smith Bespoke Carpentry & Joinery Ltd | Construction | 2026 |
| J. K. Senior & Sons | Professional & scientific | 2002 |
| James Carthy and Company Ltd. | Construction | 1995 |
| Jazcott Ltd | Manufacturing | 2024 |
| JCS Seaton Ltd | Professional & scientific | 2019 |
| JG Architectural Rigging Ltd | Wholesale & retail | 2024 |
| JH International Resilience Limited | Extraterritorial | 2018 |
| Jimmy Green Marine Ltd. | Wholesale & retail | 2009 |
| JM Clinical Psychology Ltd | Health & social care | 2024 |
| Jobseekers Recruitment Services Limited | Administrative & support | 2003 |
| John Adam House Management Company Limited | Households | 1999 |
| John Wheeler Limited | Construction | 2002 |
| John Wood Coast and Country Limited | Real estate | 2012 |
| JRK Catering Ltd | Hospitality | 2026 |
| JSN System Services Ltd | Information & communication | 2021 |
| Julian Driver Painting & Decorating Ltd | Construction | 2021 |
| Jurassic Coast Holiday Home Management Ltd | Hospitality | 2016 |
| Jurassic Coast Laundry Services Ltd | Other services | 2016 |
| Jurassic Footgolf Ltd | Arts & recreation | 2019 |
| Jurassic Performance Ltd | Information & communication | 2025 |
| Jurassic Retailers Ltd | Hospitality | 2009 |
| Jurassicbeach Ltd | Hospitality | 2025 |