| Hill International Limited | Professional & scientific | 1981 |
| Hill People Solutions Ltd | Administrative & support | 2025 |
| Hill View Consultancy Ltd | Professional & scientific | 2013 |
| Hillcrest Park Management Company Limited | Households | 2014 |
| Hillcrest View Estate Management Limited | Households | 2026 |
| Hillerton Consulting Ltd | Professional & scientific | 2011 |
| Hills Painting Ltd | Construction | 2018 |
| Hillside Gardens (Orchard RW) Management Company Limited | Real estate | 2018 |
| Hillside Translations Limited | Professional & scientific | 2013 |
| Hilton Ames Ltd | Transport & logistics | 2022 |
| Hilton Barnfield Architects Ltd | Professional & scientific | 2011 |
| Hilton Scott and Partners Limited | Financial services | 2017 |
| Hindsight Legal Consulting Limited | Information & communication | 2023 |
| HIP & FLO UK Limited | Arts & recreation | 2025 |
| Hippo Heating & Plumbing Ltd | Construction | 2017 |
| Hire Vehicles Limited | Extraterritorial | 1997 |
| Hires Group Ltd | Professional & scientific | 2025 |
| Historic Motor Sport (South West) Limited | Wholesale & retail | 2010 |
| Historical Novel Society | Arts & recreation | 2012 |
| Hittisleigh Barton Limited | Other services | 2016 |
| Hitts Barton Limited | Real estate | 2009 |
| Hive Ethical Project Developments Limited | Construction | 2020 |
| Hive Ethical Solar Portfolio 1 Limited | Financial services | 2021 |
| Hive Ethical Solar Portfolio 2 Limited | Financial services | 2021 |
| Hive Ethical UK Solar Limited | Financial services | 2021 |
| Hivecity Limited | Hospitality | 1989 |
| Hiwa (SW) Ltd | Hospitality | 2026 |
| HJG Devon Limited | Construction | 2025 |
| HJG Propertunities Limited | Real estate | 2025 |
| HJT Property Limited | Real estate | 2024 |
| HK Physio Holdings Limited | Real estate | 2026 |
| HK4 Group Limited | Hospitality | 2017 |
| HKA (F S) Limited | Financial services | 2003 |
| HKD Music Productions Limited | Arts & recreation | 2016 |
| HKM Cars Devon Ltd | Wholesale & retail | 2019 |
| HKM Cars Exeter Ltd | Wholesale & retail | 2023 |
| HL Ceramics Limited | Health & social care | 2020 |
| HL Green Services Ltd | Wholesale & retail | 2025 |
| HMB Holdings Ltd | Financial services | 2020 |
| HN Accounting Services Limited | Professional & scientific | 2019 |
| Hobbs Barn Limited | Water & waste | 2026 |
| Hobby Prizes Ltd | Other services | 2025 |
| Hobgoblin Hobbies Limited | Manufacturing | 2018 |
| Hocking Solutions Ltd | Information & communication | 2025 |
| Hockridge Properties Limited | Real estate | 2018 |
| Hodges Bridle & Co. Limited | Construction | 1999 |
| Hogs Bottom Preserves Ltd | Manufacturing | 2014 |
| Hoito Health Ltd | Information & communication | 2026 |
| Holemoor Holidays Limited | Hospitality | 2012 |
| Holemoor Solar Ltd | Energy | 2023 |
| Holiday Lets by Turners Ltd | Real estate | 2024 |
| Holistic Ideas Limited | Professional & scientific | 2010 |
| Hollamby Farming Limited | Agriculture & fishing | 2022 |
| Holland in Devon Ltd | Hospitality | 2022 |
| Holland Park Courtyard Residents Management Limited | Households | 2015 |
| Holland Park Residents Management Limited | Households | 2014 |
| Holland Properties Limited | Real estate | 1999 |
| Hollisgreen Enterprises Limited | Real estate | 2020 |
| Holly House Exeter Limited | Hospitality | 2006 |
| Holman Brothers Limited | | 1988 |
| Holmans Haulage (Exeter) Limited | | 1960 |
| Holmedale Health Limited | Real estate | 2016 |
| Holmes Building Contractors (Devon) Ltd | Construction | 2020 |
| Holmfield Investments (South West) Limited | Real estate | 2022 |
| HOLS4CO Ltd | Real estate | 2023 |
| Holy Smokes Group Limited | Wholesale & retail | 2025 |
| Home & Heart Dwellings Ltd | Real estate | 2022 |
| Home Building and Property Refurbishments Ltd | Construction | 2015 |
| Home Exeter Limited | Construction | 2019 |
| Home Garden and Beyond Ltd | Wholesale & retail | 2025 |
| Home Improvements R US Ltd | Construction | 2009 |
| Home Lead GEN Limited | Administrative & support | 2017 |
| Home Service Group Ltd | Financial services | 2024 |
| Home Square Ltd | Real estate | 2020 |
| Home Stays Management Ltd | Real estate | 2025 |
| Homely Professional Stays Limited | Real estate | 2023 |
| Homely Stays Management Limited | Real estate | 2026 |
| Homemax Property Ltd | Real estate | 2024 |
| Homesense Property Services Ltd | Construction | 2023 |
| Homespeedy Limited | Real estate | 1995 |
| Homestead Homes Limited | Health & social care | 2002 |
| Hometrust Property Services Limited | Real estate | 1998 |
| Homewok Chinese Takeaway Ltd | Hospitality | 2021 |
| Hone Daily Limited | Information & communication | 2026 |
| Honest Merch Ltd | Manufacturing | 2026 |
| Honey Hire and Lease Ltd | Wholesale & retail | 2023 |
| Hong Cheng Limited | Hospitality | 2012 |
| Hongkongers in Devon CIC | Education | 2022 |
| Honnacotts Meadow Developments Ltd | Construction | 2022 |
| Hoofprint Digital Limited | Professional & scientific | 2022 |
| Hook Farm Leisure Park Limited | Hospitality | 2017 |
| Hooper Services (South West) Ltd | Administrative & support | 2016 |
| Hooper Union Co Limited | Professional & scientific | 2026 |
| Hoopern Mews (Exeter) Management Company Limited | Households | 2018 |
| Hope & Balance Ltd | Professional & scientific | 2025 |
| Hope Hill Lodges Limited | Hospitality | 2024 |
| Hope Money Limited | Financial services | 2026 |
| Hope Solar Park Limited | Energy | 2012 |
| Hops House Management Company Limited | Households | 2026 |
| Hopton & SON Limited | Construction | 2016 |