| Health Shack London Limited | Hospitality | 2020 |
| Healthy Feet London Ltd | Health & social care | 2020 |
| Healthy Living Centre Dartford | Health & social care | 2010 |
| Healthy Systems Partnership Limited | Administrative & support | 2014 |
| Heartbreakers (SO15) Ltd | Wholesale & retail | 2017 |
| Heartland Health Limited | Public administration | 2026 |
| Heasmer Windows Home Improvements Ltd | Construction | 2016 |
| Heath Barrowcliff Consulting Limited | Information & communication | 2011 |
| Heath DS Tyres Ltd | Wholesale & retail | 2024 |
| Heaths Properties Management Ltd. | Construction | 1995 |
| Heating Matters Ltd | Construction | 2019 |
| Heavenedge Limited | Real estate | 2025 |
| Hebron Holdings Ltd | Real estate | 2024 |
| Hedley Dunk Limited | Professional & scientific | 2024 |
| Heernus Kitchen and Stores Ltd | Hospitality | 2022 |
| Hefferson Installation Ltd | Construction | 2018 |
| Helena Markey Limited | Administrative & support | 2016 |
| Helms Property Holding Limited | Financial services | 2017 |
| Helms Property Rental Limited | Real estate | 2017 |
| Help Barpak Foundation | Education | 2014 |
| Help Concern Limited | Other services | 2011 |
| Helpusmove Limited | Transport & logistics | 2007 |
| Help’S at Hand UK Services Ltd | Administrative & support | 2023 |
| Helt Property Holdings Limited | Real estate | 2025 |
| Henderson Fish Bar Ltd | Hospitality | 2024 |
| Hendo Signalling Ltd | Professional & scientific | 2022 |
| Henrick Homes Limited | Real estate | 2022 |
| Henrikleen Concept Limited | Transport & logistics | 2025 |
| Henry Gale Associates Limited | Information & communication | 2004 |
| Henson Solutions Ltd | Hospitality | 2016 |
| Henwood Thirty Nine Limited | Financial services | 2019 |
| Hephzibah Safety and Environment Solutions Ltd | Professional & scientific | 2014 |
| Hepta Holdings Limited | Other services | 2021 |
| HER Home Improvements Ltd | Construction | 2017 |
| Herald Walk Ltd | Professional & scientific | 2024 |
| Herconomy Limited | Information & communication | 2021 |
| Hercules Argyle Capital Limited | Administrative & support | 2015 |
| Hercules Argyle Residential Limited | Real estate | 2016 |
| Hercules Hire Limited | Administrative & support | 2002 |
| Hereditās Consulting Ltd | Information & communication | 2025 |
| Hereson NO.2 Management Limited | Households | 2014 |
| Heritage Accessories Ltd | Wholesale & retail | 2018 |
| Heritage Cocoa Imports Ltd | Wholesale & retail | 2025 |
| Heritage Designer Homes Limited | Construction | 2006 |
| Heritage Outdoors Ltd | Administrative & support | 2026 |
| Heritage Roofing and Renovations Ltd | Construction | 2025 |
| Heritage Wealth Planning Ltd | Administrative & support | 2016 |
| Hermitage Lane (Kent) Management Company Limited | Households | 2024 |
| Heron Wharf Co Ltd | Real estate | 2026 |
| Hesketh Park Bowls Club Limited | Arts & recreation | 1997 |
| Hesketh Park Sports Club Limited | Arts & recreation | 1992 |
| Hesperian Estates Limited | Real estate | 2026 |
| Hesperian Group Limited | Real estate | 2026 |
| Hesperian Origins Limited | Construction | 2026 |
| Hever Farm & Garden Ltd | Real estate | 2026 |
| Hexis Plus Limited | Agriculture & fishing | 2015 |
| HFX Logistics Limited | Transport & logistics | 2024 |
| HG Digital Graphics Limited | Manufacturing | 2004 |
| Hgjw Group Ltd | Administrative & support | 2025 |
| Hhomes Limited | Construction | 2022 |
| Hi-Lite Entertainment Limited | Arts & recreation | 2018 |
| Hiba Hilal Meat and Groceries Limited | Wholesale & retail | 2025 |
| Hibrid Solutions Ltd | Hospitality | 2018 |
| Hicare Medical Services Limited | Health & social care | 2019 |
| Hideaway Taverns Ltd | Hospitality | 2022 |
| Hidreamz Global Limited | Information & communication | 2022 |
| High END Construction Limited | Construction | 2012 |
| High Glory Associates Limited | Professional & scientific | 2012 |
| High Speed Promotions Limited | Professional & scientific | 2023 |
| High Standard Contractors Ltd | Construction | 2018 |
| High Tech Design Consultancy Limited | Professional & scientific | 2016 |
| High Vision Consulting Ltd | Professional & scientific | 2023 |
| Highbank Communications Limited | Professional & scientific | 2015 |
| Highflow Mechanical Ltd | Construction | 2019 |
| Highland Lodge Management Company Limited | Households | 1962 |
| Highline Roofing Improvements Ltd | Construction | 2023 |
| Highzone Care Recruitment Agency Ltd | Health & social care | 2019 |
| Hikanotes Therapy Limited | Health & social care | 2023 |
| Hilarya Ltd | Information & communication | 2024 |
| Hill Farm Developments (Kent) Limited | Construction | 2021 |
| Hill Financial Holdings Ltd | Financial services | 2023 |
| Hillbourne Housing CIC | Health & social care | 2023 |
| Hilleard Limited | Construction | 2006 |
| Hillier's Heating & Plumbing Ltd | Construction | 2022 |
| Hillside (Bean) Management Limited | Households | 1998 |
| Hillton Investments Limited | Financial services | 1951 |
| Hillview Property Management Limited | Real estate | 2010 |
| Hilton Electrical Group Ltd | Manufacturing | 2025 |
| Hindus for Labour | Other services | 2021 |
| Hindustan Financial Consultants PVT Ltd | Information & communication | 2012 |
| Hinkins Construction Co Ltd | Construction | 2018 |
| Hippie Chippy Ltd | Hospitality | 2021 |
| Hiraya Marketing Ltd | Professional & scientific | 2025 |
| Hire Logistics Limited | Transport & logistics | 2021 |
| Hismeal Limited | Health & social care | 2015 |
| Hispec Motorsport Limited | Manufacturing | 2005 |
| Histop Limited | Health & social care | 2025 |
| Hitent Fulham Park Ltd | Real estate | 2023 |
| Hitent Property Management Ltd | Real estate | 2023 |
| Hitpol Ltd | Transport & logistics | 2015 |