| Hamilton LAU Limited | Financial services | 2017 |
| Hamilton Pullen Financial Planning Ltd | Professional & scientific | 2023 |
| Hamish Marshall Multimedia Ltd | Information & communication | 2020 |
| Hamlyns Technology Ltd | Professional & scientific | 2020 |
| Hamlyns Wood Limited | Agriculture & fishing | 2023 |
| Hammand Limited | Professional & scientific | 2001 |
| Hammer MAN Ltd | Hospitality | 2018 |
| Hammett Spire LLP | | 2014 |
| Hammond & Company Ltd. | Manufacturing | 1963 |
| Hampton House Properties Limited | Real estate | 1990 |
| Hamsard 3724 Limited | Financial services | 2023 |
| Hand Car Wash (Exeter) Ltd | Other services | 2016 |
| Handle With Care Ltd | Information & communication | 1994 |
| Hang KUI Property Limited | Real estate | 2021 |
| Hanger Hill Audio Ltd | Information & communication | 2017 |
| Hanik Limited | Professional & scientific | 2014 |
| Hanks Homes Ltd | Construction | 2017 |
| Hanlee Investments Limited | Financial services | 2025 |
| Hanlees (SW) Limited | Hospitality | 2023 |
| Hannard Developments Limited | Construction | 2007 |
| Hannard Holdings Ltd | Financial services | 2018 |
| Hannard Investments Ltd | Financial services | 2018 |
| Hannon Homes Limited | Construction | 2000 |
| Hanover Lane (Heavitree) Management Limited | Real estate | 2012 |
| Hanover Lifts Limited | Manufacturing | 2011 |
| Hansa Garden Limited | Wholesale & retail | 2015 |
| Hanzal Erdahl Limited | Hospitality | 2024 |
| HAO YOU DUO Ltd | Hospitality | 2024 |
| Hapenny Ltd | Construction | 2020 |
| Hapikata Limited | Administrative & support | 2021 |
| Happiness Outdoors Project CIC | Education | 2024 |
| Happy Happy Home Co Limited | Real estate | 2021 |
| Happy Hounds Daycare Exeter Ltd | Agriculture & fishing | 2022 |
| Haran Limited | Real estate | 1992 |
| Harbour Beach Holidays Ltd | Hospitality | 2025 |
| Harbour Rise Limited | Administrative & support | 2007 |
| Harbour View Newquay Management Company Limited | Households | 2007 |
| Hard Edge Theatre Ltd | Arts & recreation | 2021 |
| Hard Rock Brickwork Ltd | Construction | 2021 |
| Hardware Investments Limited | Financial services | 2024 |
| Hardware Services Limited | Administrative & support | 2009 |
| Hardy Cycles Ltd | Manufacturing | 2024 |
| Hardy Vascular Ltd | Health & social care | 2026 |
| Hardys Court RTM Company Limited | Households | 2017 |
| Harefield Construction Ltd | Construction | 2026 |
| Harford Ziegler Limited | Real estate | 2026 |
| Hargold Trading Limited | Wholesale & retail | 2003 |
| Harika Limited | Real estate | 2020 |
| Harkster Limited | Information & communication | 2023 |
| Harlequin Health & Safety Ltd | Construction | 2013 |
| Harlequin House Properties Ltd | Real estate | 2018 |
| Harmony Hills Accommodation Ltd | Real estate | 2024 |
| Harmony Profiles Limited | Manufacturing | 1996 |
| Harper & Hounds Dog Grooming Ltd | Other services | 2024 |
| Harper Financial Commercial Solutions Limited | Financial services | 2025 |
| Harper Financial Ltd | Financial services | 2013 |
| Harper James Property Investments Ltd | Real estate | 2025 |
| Harper Property Group Ltd | Real estate | 2025 |
| Harper XII Technologies Ltd | Information & communication | 2026 |
| Harrington Homes (Carbis Bay One) Ltd | Construction | 2022 |
| Harrington Homes (Lifton) Ltd | Construction | 2018 |
| Harrington Homes (Plymouth) Limited | Construction | 2018 |
| Harrington Homes (SW) Limited | Construction | 2018 |
| Harrington Park (Pinhoe) Management Company Limited | Households | 2021 |
| Harris Bugg Limited | Professional & scientific | 2017 |
| Harris Mcmillan Limited | Professional & scientific | 2003 |
| Harris Timber Products Limited | Manufacturing | 2008 |
| Harris, Miles and Miles (Holdings) Limited | Financial services | 2025 |
| Harris, Miles and Miles Limited | Real estate | 2022 |
| Harrison Consultancy Ltd | Professional & scientific | 2021 |
| Harrison Richmond Limited | Administrative & support | 2024 |
| Harry Delaux Ltd | Real estate | 2023 |
| Harry Douglas Consulting Ltd | Professional & scientific | 2022 |
| Harry Hawke Limited | Real estate | 2024 |
| Harry LEE Limited | Real estate | 2024 |
| Harry Moore Commercials Ltd | Wholesale & retail | 2012 |
| Harry Stillings (Advertising) Limited | Professional & scientific | 1960 |
| Harry WAS 8 Limited | Manufacturing | 2018 |
| Hart Court Management Company Limited | Households | 2025 |
| Hart External Cleaning Limited | Administrative & support | 2019 |
| Hart Ireson Limited | Administrative & support | 2000 |
| Hart Window Cleaning Limited | Administrative & support | 2003 |
| Hartford Advisers Limited | Administrative & support | 2019 |
| Hartland Quay Hotel LLP | | 2010 |
| Hartle Homes Limited | Real estate | 2018 |
| Hartle Investments Limited | Financial services | 2018 |
| Hartleigh Restoration Limited | Construction | 2006 |
| Hartley Property Ltd | Real estate | 2025 |
| Hartnell Chanot & Partners Limited | Professional & scientific | 2010 |
| Harvest Developments Limited | Construction | 2002 |
| Harvest Group LLP | | 2020 |
| Harvest Homes Property Management Limited | Real estate | 2018 |
| Harvest Training Limited | Education | 2025 |
| Harvesthawk Agrisystem Ltd | Agriculture & fishing | 2025 |
| Haselwood Limited | Real estate | 2017 |
| Hashswag Merchandise Limited | Professional & scientific | 2023 |
| Haslehurst House Management Company Limited | Households | 2025 |
| Hasnu Holdings Limited | Hospitality | 2025 |
| Hatchplan (Holdings) Limited | Financial services | 2021 |
| Hatchplan Limited | Construction | 1998 |