| Happylife Industry Corp. Ltd | Professional & scientific | 2007 |
| HAPPYLIFE8 Ltd | Wholesale & retail | 2025 |
| Happystyle Ltd | Wholesale & retail | 2025 |
| Haps Audiology Ltd | Health & social care | 2025 |
| Hapus People Ltd | Administrative & support | 2024 |
| Hapus Recruitment Ltd | Administrative & support | 2024 |
| Hapus Recruitment Services Ltd | Administrative & support | 2025 |
| Haqn Holdings Ltd | Real estate | 2024 |
| Haqpal Ltd | Administrative & support | 2026 |
| Hara Property Limited | Real estate | 2021 |
| Harad Ltd | Wholesale & retail | 2020 |
| Haradipnir Ltd | Administrative & support | 2020 |
| Haraled Consultancy Limited | Professional & scientific | 1997 |
| Haramaeen Travels Ltd | Administrative & support | 2016 |
| Harav Finance Limited | Professional & scientific | 2020 |
| Haraz Managing Limited | Wholesale & retail | 2025 |
| Harbison Walker (UK) Co., Limited | Wholesale & retail | 2023 |
| Harbor Bridge Software Ltd | Information & communication | 2025 |
| Harbor Brook Soft Ltd | Information & communication | 2025 |
| Harbor Euro Grid Ltd | Information & communication | 2025 |
| Harbor Provisions Ltd | Extraterritorial | 2011 |
| Harborough Management Limited | Construction | 2018 |
| Harbour Dream Limited | Hospitality | 2026 |
| Harbour ENT Limited | Information & communication | 2025 |
| Harbour Essence Limited | Hospitality | 2019 |
| Harbour House Publishing Ltd | Information & communication | 2023 |
| Harbour Medical Clinic Ltd | Health & social care | 2026 |
| Harbour Point Freehold Ltd | Financial services | 2024 |
| Harbour Porthcawl Limited | Hospitality | 2017 |
| Harbourside (East Quay Apartments 13-21 & 31-39) Management Company Limited | Households | 2022 |
| Harbourside Products Limited | Manufacturing | 2015 |
| Harbwr Home & Life Support CIC | Health & social care | 2026 |
| Hard Lines Limited | Wholesale & retail | 2018 |
| Hard Surface Ltd | Construction | 2017 |
| Hardalac Seas Ltd | Extraterritorial | 2025 |
| Hardan Ltd | Wholesale & retail | 2025 |
| Hardbody Supplements Limited | Wholesale & retail | 2018 |
| Hardeep SINGH1 Ltd | Construction | 2025 |
| Hardenit Limited | Information & communication | 2017 |
| Hardesty & Lavater Estates Limited | | 1988 |
| Hardia Developments Limited | Construction | 2016 |
| Harding Road Management RTM Company Limited | Households | 2025 |
| Hardman Aviation Ltd | Administrative & support | 2017 |
| Hardshell UK Limited | Manufacturing | 2011 |
| Hardtoys LLP | | 2025 |
| Harduken Limited | Financial services | 2014 |
| Hardy & Osborne Fitness Ltd | Arts & recreation | 2025 |
| Hardy Talent Ltd | Professional & scientific | 2025 |
| Harex Global Ltd | Wholesale & retail | 2025 |
| Harford Rail Ltd | Construction | 2019 |
| Harg Limited | Real estate | 2011 |
| Hari Indah Ltd | Administrative & support | 2015 |
| Harim Ltd | Wholesale & retail | 2025 |
| Harj Consultancy Limited | Health & social care | 2010 |
| Harjen Developments Ltd | Real estate | 2025 |
| Harjo Group Ltd | Financial services | 2026 |
| Harkus & Harkus Limited | Real estate | 2021 |
| Harland Simon Automation Systems Ltd | Manufacturing | 1973 |
| Harlech Court Limited | Construction | 2018 |
| Harlequin Property Services Limited | Construction | 2025 |
| Harlequin Trades Limited | Construction | 2016 |
| Harley Life Therapies Limited | Extraterritorial | 2011 |
| Harley Street (CPC) Limited | Health & social care | 2018 |
| Harley Street Luxe Ltd | Wholesale & retail | 2025 |
| HARLEYS2019 Ltd | Education | 2019 |
| Harlowproperty Ltd | Real estate | 2024 |
| Harmanpreet Ahir Ltd | Construction | 2017 |
| Harmeen Ltd | Wholesale & retail | 2022 |
| Harmonia - Rage & Rebalance Rooms Ltd | Arts & recreation | 2025 |
| Harmonic Consultancy Solutions Limited | Professional & scientific | 2020 |
| Harmonie Home Private Limited | Real estate | 2025 |
| Harmony Care Limited | Health & social care | 2023 |
| Harmony Circle Cleaning Solutions Ltd | Administrative & support | 2016 |
| Harmony Decor Ltd | Wholesale & retail | 2025 |
| Harmony Gardens & Estate Development Ltd | Financial services | 2025 |
| Harmony Party Ltd | Other services | 2025 |
| Harmostyle Ltd | Other services | 2025 |
| Harness EDS Engineering Limited | Professional & scientific | 2014 |
| Harness Ventures UK Limited | Information & communication | 2023 |
| Harnisch-Lacey Dance Theatre Limited | Arts & recreation | 2008 |
| Haro Services Limited | Health & social care | 2015 |
| Haroldstones Ltd | Wholesale & retail | 2019 |
| Haroonsecurityservices Ltd | Administrative & support | 2024 |
| Harp A.I Solutions Ltd | Information & communication | 2025 |
| Harper Lewis Limited | Construction | 2021 |
| Harper Signature Ltd | Real estate | 2023 |
| Harpernoah Food Ltd | Wholesale & retail | 2023 |
| Harraj Properties Ltd | Households | 2025 |
| Harrier Corporate Finance Limited | Professional & scientific | 1994 |
| Harriet Street Ltd | Real estate | 2023 |
| Harrington & Bradburn Limited | Administrative & support | 2025 |
| Harrington & Hunt Automotive Limited | Wholesale & retail | 2025 |
| Harrington Moore Limited | Administrative & support | 2014 |
| Harrington Webb Limited | Other services | 2020 |
| Harriot Bars Ltd | Hospitality | 2012 |
| Harris & Curtis Ltd | Real estate | 2024 |
| Harris Capital Global Ltd | Real estate | 2023 |
| Harris Findleys Ltd | Wholesale & retail | 2023 |
| Harris Floor Screeding Limited | Construction | 2015 |
| Harris Loft and Extensions Ltd | Construction | 2016 |