| Health Sense Wellness Limited | Health & social care | 2018 |
| Health Store Holdings Ltd | Professional & scientific | 2017 |
| Health-Lee Pharma Limited | Health & social care | 2018 |
| Healthcare BEE Ltd | Health & social care | 2021 |
| Healthcare&Hospitality Cleaning Dorset Limited | Administrative & support | 2024 |
| Healthnewstoday Ltd | Information & communication | 2025 |
| Healy Admin Solutions Ltd | Administrative & support | 2019 |
| Hear ME NOW CIC | Education | 2025 |
| Hear ME NOW Consultancy Ltd | Education | 2025 |
| Heart & Parcel Ltd | Wholesale & retail | 2008 |
| Heart of Home Care Ltd | Administrative & support | 2025 |
| Heartbox Ltd | Wholesale & retail | 2024 |
| Heartful Partners Limited | Professional & scientific | 2023 |
| Hearts of Oak Organisation CIC | Health & social care | 2025 |
| Hearts to Heal CIC | Health & social care | 2026 |
| Heartwarming Tales Community Interest Company | Information & communication | 2025 |
| Heat Blued Ltd | Wholesale & retail | 2025 |
| Heat Recovery UK Limited | Construction | 2025 |
| Heath Court Ltd | Wholesale & retail | 2021 |
| Heating Home Solutions Ltd | Manufacturing | 2025 |
| Heating Sales Direct Limited | Wholesale & retail | 2024 |
| Heatmaster UK Limited | Construction | 2006 |
| Heavenly Sales Ltd | Wholesale & retail | 2025 |
| Heavenly Services Midlands Ltd | Hospitality | 2025 |
| Heavy Petal Ltd | Wholesale & retail | 2026 |
| Hector Olivarius Ltd | Real estate | 2017 |
| Hectors House Surveys & Valuations LLP | | 2026 |
| Hedgerow Cordials Limited | Manufacturing | 2013 |
| Hedone Ltd | Wholesale & retail | 2024 |
| Hedumic Limited | Hospitality | 2022 |
| HEH Enterprises Limited | Administrative & support | 1959 |
| Heidelai Limited | Information & communication | 2024 |
| Heighams (Barrow) Management Company Limited | Households | 2009 |
| Heights Enterprise Limited | Health & social care | 2012 |
| Heinemann Salcedo Business Consultancy Ltd | Information & communication | 2023 |
| Heirloom Capital Ltd | Financial services | 2025 |
| Hekym Limited | Information & communication | 2022 |
| Helena Bailey Coaching Ltd | Other services | 2020 |
| Helix Q Ltd | Wholesale & retail | 2025 |
| Helix Transition Capital Partners LP | | 2025 |
| Helix UK (North) Ltd | Wholesale & retail | 2025 |
| Hello Glow Aesthetics Ltd | Other services | 2024 |
| Helmets Engineering Ltd | Construction | 2024 |
| Helmsley Cottage Ltd | Real estate | 2026 |
| Helmy Sanchez DE Medina Property Limited | Real estate | 2024 |
| Help and Save Limited | Financial services | 2021 |
| Help My Firm Ltd | Professional & scientific | 2023 |
| Helpful Home Services Ltd | Administrative & support | 2023 |
| Helpful Joy Limited | Wholesale & retail | 2024 |
| Helquaris Core Ltd | Information & communication | 2026 |
| Henderson Maintenance Limited | Construction | 2020 |
| Hendron Pearce Limited | Administrative & support | 2013 |
| Henleys Mildenhall Limited | Real estate | 2014 |
| Hennessey Lifestyle Limited | Wholesale & retail | 2017 |
| Henstock Consultancy Ltd | Information & communication | 2024 |
| Hephzibah's Beulah Ltd | Information & communication | 2015 |
| HER A-Z Studios CIC | Other services | 2025 |
| HER Game TOO CIC | Information & communication | 2022 |
| Herbal Quarters International Ltd | Wholesale & retail | 2025 |
| Hercules Fireworks Ltd | Wholesale & retail | 2020 |
| Hercules Pharma Services Limited | Professional & scientific | 2011 |
| Here WE Go Again Travel Limited | Professional & scientific | 2023 |
| Heretical Studios Ltd | Information & communication | 2022 |
| Heritage Luxury Ltd | Wholesale & retail | 2026 |
| Heritage Wall Coatings Ltd | Construction | 2026 |
| Heritage Window Solutions Limited | Construction | 2026 |
| Hernandez Ltd | Hospitality | 2025 |
| Hero Developments Ltd | Real estate | 2017 |
| Heron Club Limited | Arts & recreation | 1964 |
| Herot Group Ltd | Professional & scientific | 2019 |
| Herring Software Solutions Ltd | Information & communication | 2021 |
| Hertfordshire Pest Control Limited | Manufacturing | 2025 |
| Hervanr Ltd | Wholesale & retail | 2020 |
| Hesh Security Limited | Information & communication | 2023 |
| Hesham EL Mansoury Ltd | Health & social care | 2022 |
| Heskey's Limited | Hospitality | 2022 |
| HEX Group Ltd | Financial services | 2018 |
| Hexad International Ltd | Information & communication | 2025 |
| Hexai Care Limited | Information & communication | 2025 |
| Hextron Ltd | Information & communication | 2024 |
| HEY IO Limited | Information & communication | 2025 |
| Heyspanish Ltd | Education | 2020 |
| HFD Trading Limited | Information & communication | 2024 |
| HFH Contracts Limited | Administrative & support | 2015 |
| HFH Holdings Limited | Financial services | 2020 |
| HFT Tech Limited | Information & communication | 2025 |
| HG Trade Services Ltd | Wholesale & retail | 2025 |
| HGV Intensive Limited | Education | 2026 |
| HGV Turnkey Services Ltd | Transport & logistics | 2019 |
| HHP Hospitality Ltd | Extraterritorial | 2015 |
| HHS Commerce Limited | Information & communication | 2024 |
| Hibio Ltd | Information & communication | 2026 |
| Hibuy World Limited | Manufacturing | 2025 |
| Hicks Geophysics Ltd | Professional & scientific | 2025 |
| Hidden Colour Limited | Information & communication | 2009 |
| Hidden UK Gems Ltd. | Administrative & support | 2021 |
| Hierax Itsm Ltd | Information & communication | 2025 |
| Hifields Limited | Arts & recreation | 2018 |
| Higgs Property Management Ltd | Real estate | 2026 |
| High Frequency Ltd | Administrative & support | 2023 |