| Harish Cuisine Ltd | Hospitality | 2019 |
| Harkwood Services Limited | Transport & logistics | 2011 |
| Harland Bookkeeping Services Limited | Professional & scientific | 2022 |
| Harlequin Developments Limited | Construction | 2018 |
| Harlequinn Homes Limited | Real estate | 2014 |
| Harlequinn Properties Limited | Real estate | 2017 |
| Harlestone Grange (Dallington) Management Company Limited | Households | 2025 |
| Harley Street Skin Aesthetic Training Ltd | Education | 2018 |
| Harlor Civils Limited | Construction | 2019 |
| Harlos Trading Co., Ltd | Wholesale & retail | 2025 |
| Harlton Farms Limited | Agriculture & fishing | 1963 |
| Harlton Humblebee Ltd | Extraterritorial | 2023 |
| Harmaya Ltd | Real estate | 2025 |
| Harmonicham Productions LLP | | 2022 |
| Harmony Education Ltd | Education | 2022 |
| Harmony Employment Law Limited | Professional & scientific | 2019 |
| Harmony Food Hubs Ltd | Hospitality | 2018 |
| Harmony HR Solutions Limited | Professional & scientific | 2016 |
| Harmony Wellness Group Limited | Other services | 2024 |
| Harnam Ltd | Manufacturing | 2025 |
| Harness Therapeutics Limited | Professional & scientific | 2018 |
| Haro & Bute Associates Ltd | Information & communication | 2023 |
| Harose Intelligence Ltd | Education | 2022 |
| Harpenden Active Limited | Education | 2022 |
| Harper Consultancy Limited | Professional & scientific | 1994 |
| Harper Film Productions Ltd | Information & communication | 2022 |
| Harriet Faith & Companies Ltd | Transport & logistics | 2018 |
| Harriet Grundy Ltd | Professional & scientific | 2016 |
| Harrington Capital Partners Ltd | Financial services | 2026 |
| Harrington Chase Ltd | Administrative & support | 2023 |
| Harris Yard (Saffron Walden) NO.2 Management Company Limited | Households | 2004 |
| Harrisonhelos Ltd | Manufacturing | 2023 |
| Harrisons of Burwell Limited | Construction | 2003 |
| Harrold Fruit Farming Limited | Agriculture & fishing | 2016 |
| Harrow Ventures Limited | Information & communication | 2006 |
| Harrowfield International Co., Ltd | Wholesale & retail | 2025 |
| Harshcontrast Ltd | Information & communication | 2022 |
| Harston Medical Services Ltd. | Other services | 2010 |
| Hart Williamson Ltd | Professional & scientific | 2025 |
| Hart Worldwide Limited | Education | 2025 |
| Hartest Precision Instruments Limited | Manufacturing | 1947 |
| Hartwells Carpentry Limited | Construction | 2006 |
| Harvest Aluminium Co., Ltd | Extraterritorial | 2013 |
| Harvest Maritime Co., Limited | Wholesale & retail | 2023 |
| Harvey Farming Company Limited | Agriculture & fishing | 1996 |
| Harvey Goods Ltd | Wholesale & retail | 2023 |
| Harvey Goodwin Freehold Limited | Households | 2007 |
| Harvey Goodwin Residents Association Limited | Households | 1983 |
| Harvey Medical Consulting Limited | Administrative & support | 2013 |
| Harvey Road Productions Ltd | Arts & recreation | 2019 |
| Harwood Campbell Ltd | Professional & scientific | 2025 |
| Harwood Hide Limited | Wholesale & retail | 1999 |
| HAS Kara Foods Ltd | Hospitality | 2026 |
| Haslewood Kies Limited | Professional & scientific | 2013 |
| Haslingfield Spice Ltd | Hospitality | 2024 |
| Hassan Garage Ltd | Wholesale & retail | 2025 |
| Hassan Invests Ltd | Health & social care | 2025 |
| Hastings Logistics Ltd | Transport & logistics | 2024 |
| Hastings Manor (Hugglescote) Residents Management Company Limited | Households | 2017 |
| Hatchcloud Ltd | Information & communication | 2018 |
| Hatcher Estates Limited | Real estate | 2012 |
| Hatches UP Ltd | Information & communication | 2025 |
| Hatsbridge Ltd | Manufacturing | 2026 |
| Hatter Street Properties Limited | Construction | 2016 |
| Haunted Audio Ltd | Information & communication | 2026 |
| Hauser-Raspe Foundation | Education | 2001 |
| Haute Maison Limited | Wholesale & retail | 2024 |
| Hauxton Limited | Other services | 2017 |
| Havakustik Ltd | Professional & scientific | 2018 |
| Haven of Hope CIC | Administrative & support | 2018 |
| Haven Village Management Limited | Real estate | 2003 |
| Havenden Homes Ltd | Real estate | 2025 |
| Haverhill Electrical Supplies Limited | Wholesale & retail | 2012 |
| Haverhill Lighting Limited | Wholesale & retail | 2016 |
| Havnsoegaard Agro UK Ltd | Real estate | 2015 |
| Hawaiian Poke Bowl Ltd | Hospitality | 2021 |
| Hawk Aviation Ltd | Manufacturing | 2018 |
| Hawkswren Ltd | Real estate | 2018 |
| Haworth Composites Ltd | Manufacturing | 2021 |
| Hawthorn Trading Ltd | Wholesale & retail | 2025 |
| Hawthornes Management (North) Limited | Households | 1987 |
| Hayden Martin Film Ltd | Arts & recreation | 2018 |
| Hayden Martin Limited | Real estate | 2010 |
| Hayes Skin Solutions Ltd | Health & social care | 2024 |
| Hayley Balls Limited | Professional & scientific | 2021 |
| Haynes Training Limited | Agriculture & fishing | 2009 |
| Haysom Ward Miller Ltd | Professional & scientific | 2010 |
| Haywards Gardens (Kegworth) MAN Co. Limited | Households | 2013 |
| Haywards Holdings (Cambridge) Limited | Financial services | 2019 |
| Hayylo Platforms Limited | Information & communication | 2020 |
| Hazard Chase Holdings Limited | Professional & scientific | 1999 |
| Hazard Chase Limited | Other services | 1990 |
| Hazard Chase Property Management Limited | Real estate | 2005 |
| Hazell and Kent Ltd | Real estate | 2018 |
| Hazelwood Educational Services Limited | Education | 2016 |
| Hazey Bakes Ltd | Manufacturing | 2025 |
| Hazlewell Court Management Limited | Administrative & support | 2007 |
| Hazlewell Land Ltd | Agriculture & fishing | 2006 |
| HB Aviation Ltd | Manufacturing | 2023 |
| Hb&H Property Limited | Real estate | 2019 |