| Honey Street Management Company Limited | Real estate | 2005 |
| Honey's Catering SW Ltd | Hospitality | 2024 |
| Honeyshute Childcare Ltd | Education | 2019 |
| Honeystone Plastering & Building Services Ltd | Construction | 2019 |
| Honeywood Property Management Limited | Real estate | 2025 |
| Hong Cultural & Educational Consultation Ltd | Education | 2017 |
| Hong Education Limited | Education | 2018 |
| Honicknowle Commnet Limited | Health & social care | 1999 |
| Honicknowle Fish and Chips Ltd | Hospitality | 2024 |
| Honicknowle Store Ltd | Wholesale & retail | 2021 |
| HOO Lounge Ltd | Hospitality | 2025 |
| Hood Rigging Ltd | Real estate | 2003 |
| Hooe Lake Gardens Limited | Administrative & support | 1986 |
| Hooe Manor NO 1 Management Ltd | Households | 2014 |
| Hooe Manor NO 2 Management Ltd | Households | 2014 |
| Hook Fish and Chips Ltd | Hospitality | 2019 |
| Hoolify Investments Ltd | Real estate | 2023 |
| HOP E Brew Ltd | Manufacturing | 2023 |
| Hope Rentals Limited | Real estate | 2025 |
| Hopes Generation Ltd | Professional & scientific | 2020 |
| Hopes Saloon Ltd | Other services | 2020 |
| Hope’S Gold Collection Limited | Wholesale & retail | 2025 |
| Hoppy Sports Ltd | Wholesale & retail | 2025 |
| Hoppy's Sports Limited | Wholesale & retail | 2020 |
| Hopton Road Management Company Limited | Households | 1988 |
| Horizon and Tide Ltd | Real estate | 2025 |
| Horizon Burnham Ltd | Construction | 2018 |
| Horizon CMS Limited | Professional & scientific | 2025 |
| Horizon Plymouth Properties Ltd | Real estate | 2025 |
| Horizon Roofing Holdings Limited | Professional & scientific | 2005 |
| Horizon Roofing Ltd | Construction | 2001 |
| Horizon Venture Group Ltd | Wholesale & retail | 2015 |
| Horizons Blue Ltd. | Information & communication | 2023 |
| Horrell Heating and Plumbing Limited | Construction | 2013 |
| Horsebrook Enterprises Ltd | Information & communication | 2014 |
| Horseguards (Exeter) Management Company Limited | Households | 2011 |
| Horseman Groundworks and Plant Hire Limited | Construction | 2021 |
| Horseman Groundworks Limited | Construction | 2023 |
| Horwell Holdings Limited | Professional & scientific | 1999 |
| Hos-Sec Ltd | Administrative & support | 2025 |
| Hoskin Plant & Civils Limited | Agriculture & fishing | 2024 |
| Hoskings Garage Limited | Wholesale & retail | 2011 |
| Hospitality Exmouth Limited | Hospitality | 2013 |
| Hosteria Romana Complex NO.1 Limited | | 1989 |
| Hostier Ltd | Hospitality | 2024 |
| Hosts on the Coast Ltd | Other services | 2025 |
| Hot Rock Projects Limited | Professional & scientific | 2017 |
| Hotham Place Property Management Limited | Households | 2019 |
| Houldsworth Educational Consultancy Limited | Professional & scientific | 2008 |
| Houndiscombe Management Limited | Households | 2006 |
| Houndisrep Limited | Administrative & support | 1982 |
| Hourani Limited | Hospitality | 2026 |
| House 2 Home Lets Ltd | Real estate | 2011 |
| House in Prime Ltd | Real estate | 2024 |
| House Martin Mortgages Ltd | Financial services | 2025 |
| House of Art Studios Ltd | Information & communication | 2017 |
| House of Bamboo Ltd | Hospitality | 2015 |
| House of Biryani Plymouth Ltd | Hospitality | 2026 |
| House of Bohemia Limited | Manufacturing | 2025 |
| House of Brews Ltd | Extraterritorial | 2021 |
| House of Harris Properties Ltd | Real estate | 2017 |
| House of Luxe by Nelia Limited | Wholesale & retail | 2026 |
| House of Pizza and Fizz Ltd | Hospitality | 2019 |
| House of Pretzel Ltd | Wholesale & retail | 2023 |
| House of Rapscallion LLP | | 2025 |
| House of Solara Limited | Manufacturing | 2025 |
| House Proud Cleaning SW Ltd | Administrative & support | 2025 |
| Housing Matters Limited | Construction | 2016 |
| Hover Limited | Extraterritorial | 2011 |
| Howard and Over LLP | | 2011 |
| Howards Trading Company Ltd | Wholesale & retail | 2022 |
| Howdah Foods & Snacks Ltd | Wholesale & retail | 2017 |
| Howdin Holdings Limited | Real estate | 2025 |
| Howlpad Ltd | Real estate | 2023 |
| Howzer SKA OT Ltd | Other services | 2023 |
| HPE Airflow SW Limited | Construction | 2015 |
| HPH PUB Management Limited | Hospitality | 2019 |
| HQW Aerospace (UK) Limited | Manufacturing | 1948 |
| HQW Holding (UK) Co. Limited | Financial services | 2019 |
| HR on Call Ltd | Information & communication | 2025 |
| HR Plymouth Ltd | Professional & scientific | 2021 |
| HRI Group Ltd | Financial services | 2020 |
| HS Interiors Ltd | Wholesale & retail | 2016 |
| HSH Consulting Limited | Hospitality | 2019 |
| HSK Building & Carpentry Contractors Ltd | Manufacturing | 2021 |
| HSK Building Services Limited | Construction | 2016 |
| HT and Sons Automotive Limited | Wholesale & retail | 2025 |
| Hubbyhire Limited | Construction | 2005 |
| Hudson Taverns Limited | Hospitality | 2019 |
| Huggins Holdings Limited | Financial services | 2019 |
| Hugh Roar Limited | Wholesale & retail | 2026 |
| Hughsons Ltd | Real estate | 2021 |
| Hugo Holdings (SW) Ltd | Financial services | 2024 |
| Hugo James Portfolio Ltd | Construction | 2020 |
| Hugoretro Ltd | Extraterritorial | 2023 |
| Humaincopy Limited | Professional & scientific | 2025 |
| Human Centric Limited | Professional & scientific | 2014 |
| Human Space 2019 Limited | Real estate | 2019 |
| Humanist Support Services Limited | Administrative & support | 2025 |
| Humankind Resources Ltd | Administrative & support | 2024 |