| Harris Plumbing and Building Services Ltd | Administrative & support | 2019 |
| Harris Properties CDF Ltd | Financial services | 2025 |
| Harris Resource Ltd | Real estate | 2020 |
| Harrisgarveyproperties Limited | Real estate | 2021 |
| Harrismith Road Management Company Limited | Households | 2006 |
| Harrison Bailey Group Limited | Extraterritorial | 2026 |
| Harrison Consultancy Services Limited | Professional & scientific | 2025 |
| Harrison Property Developments Limited | Real estate | 2016 |
| Harrisons Access Solutions Ltd | Construction | 2018 |
| Harrisons of London Ltd | Administrative & support | 2025 |
| Harrisson TV Ltd | Information & communication | 2019 |
| Harrowdene Freehold Limited | Households | 1985 |
| Harrowdene Management Company Limited | Households | 1976 |
| Harry Davies Properties Ltd | Real estate | 2022 |
| Harry Family Limited | Professional & scientific | 2022 |
| Harry Harper Property Investment Limited | Real estate | 2011 |
| Harry Holland Ltd | Arts & recreation | 2003 |
| Harry Horse Limited | Other services | 2012 |
| Harry Nicholas Ltd | Wholesale & retail | 2026 |
| Harry Robinson Wealth Management Limited | Financial services | 2021 |
| Harry Souq Limited | Wholesale & retail | 2025 |
| Harryblow Ltd | Information & communication | 2023 |
| Harrycar Ltd | Wholesale & retail | 2024 |
| Harrycoaws Ltd | Wholesale & retail | 2025 |
| Harryshomeessentials Ltd | Wholesale & retail | 2025 |
| Harry’S Juice Bar Ltd | Wholesale & retail | 2022 |
| Harsh Properties Ltd | Real estate | 2023 |
| Harsha Imaging Limited | Health & social care | 2026 |
| Harshalya Ltd | Real estate | 2025 |
| Harshay Group Ltd | Administrative & support | 2024 |
| Harshit General Trading Company Ltd | Water & waste | 2025 |
| Hart Psychotherapy Limited | Health & social care | 2016 |
| Hartios Ltd | Construction | 2016 |
| Hartland Fire Holdings Ltd | Construction | 2024 |
| Hartley and Larcombe Limited | Construction | 1985 |
| Hartley Group Limited | Real estate | 2019 |
| Hartleydavies Properties Limited | Real estate | 2018 |
| Hartswood Dental Practice Limited | Health & social care | 2025 |
| Hartt Holdings Ltd | Financial services | 2024 |
| Hartwellhomeware Ltd | Wholesale & retail | 2026 |
| Harun Biter Ltd | Wholesale & retail | 2024 |
| Haruna Bello Enterprises Limited | Health & social care | 2016 |
| Harunie's Limited | Transport & logistics | 2025 |
| Harvard World Records Limited | Information & communication | 2021 |
| Harvest Bridge Limited | Financial services | 2021 |
| Harvest Fresh UK Ltd | Information & communication | 2013 |
| Harvest Machine Leasing Limited | Administrative & support | 2025 |
| Harvesthires Ltd | Administrative & support | 2025 |
| Harvey Business Support Limited | Administrative & support | 2024 |
| Harvey James London Ltd | Wholesale & retail | 2020 |
| Harvey Nichols International Ltd | Extraterritorial | 2026 |
| Harvey Property (UK) Limited | Real estate | 2014 |
| Harvey, Peters & Co. Limited | Professional & scientific | 2008 |
| Harveybay Engineering Ltd | Manufacturing | 2012 |
| Harveyn Trade PC | | 2017 |
| Harvyl Rituals Ltd | Wholesale & retail | 2025 |
| Harwards Homes & Living Solutions Ltd | Wholesale & retail | 2025 |
| Haryana Foods Ltd | Wholesale & retail | 2019 |
| Hasa International Ltd | Wholesale & retail | 2020 |
| Hasan IT Ltd | Information & communication | 2025 |
| Hasanlyprime Ltd | Wholesale & retail | 2025 |
| Haseeb Ahmed Limited | Wholesale & retail | 2025 |
| Haseeb Mehmood Ltd | Wholesale & retail | 2025 |
| Haseen Mart Ltd | Wholesale & retail | 2026 |
| Haseena Ltd | Wholesale & retail | 2025 |
| Hasero Services Ltd | Administrative & support | 2020 |
| Haserva Ltd | Wholesale & retail | 2025 |
| Hasg Holdings Ltd | Real estate | 2025 |
| Hasham Tech Limited | Wholesale & retail | 2025 |
| Hashtag 21 Ltd | Wholesale & retail | 2021 |
| Hashtag Consultants Ltd | Professional & scientific | 2017 |
| Hashtag Print Ltd | Information & communication | 2019 |
| Hashthings Ltd | Other services | 2025 |
| Hashy Moto Limited | Transport & logistics | 2019 |
| Hasitech Ltd | Wholesale & retail | 2019 |
| Hasni Global Business (HGB) Ltd | Wholesale & retail | 2023 |
| Haspex Traders Limited | Wholesale & retail | 2022 |
| Hassaan Locums Ltd | Health & social care | 2021 |
| Hassan Ecom Ltd | Wholesale & retail | 2026 |
| Hassan Group of Businesses Ltd | Wholesale & retail | 2021 |
| Hastag IT Ltd | Information & communication | 2018 |
| Hasteren Services Ltd. | Professional & scientific | 1999 |
| Hastings Associates Limited | Extraterritorial | 2026 |
| Hastings Drummond Limited | Wholesale & retail | 2008 |
| Hastings Group (Consolidated) Limited | Financial services | 2020 |
| Hastings Group Ltd | Professional & scientific | 2025 |
| Hastings House (Cardiff) Limited | Professional & scientific | 2025 |
| Hatala Star Market Limited | Wholesale & retail | 2026 |
| Hatata Developments Ltd | Households | 2026 |
| Hatcher's Electrical Ltd | Construction | 2023 |
| Hatfield Bespoke Ltd | Manufacturing | 2025 |
| Hatherden Ltd | Real estate | 2018 |
| Hatim Ltd | Wholesale & retail | 2024 |
| Hatke Ltd | Hospitality | 2019 |
| Hatsu Udon Ltd | Hospitality | 2024 |
| Hattersley Consulting Group Limited | Administrative & support | 2015 |
| Hatton & Berkeley Receivables Ltd | Administrative & support | 2016 |
| Haua Ltd | Wholesale & retail | 2022 |
| Haugesund Hardware Ltd | Other services | 2026 |
| Haughton Honey Limited | Agriculture & fishing | 2003 |