| H & K Corporation Ltd | Hospitality | 2009 |
| H & W Property Ltd | Real estate | 2020 |
| H Chandley Properties Limited | Real estate | 1960 |
| H Churchill Marketing Services Ltd | Information & communication | 2024 |
| H&A Property Holdings Limited | Real estate | 2023 |
| H. F. Bishop & SON Limited | Construction | 2011 |
| H. M. Newman Limited | Financial services | 2003 |
| H. O. Champneys Limited | Agriculture & fishing | 1955 |
| H.A.Sheppard and Company Limited | Financial services | 1954 |
| H.E.N.K Ltd | Hospitality | 2018 |
| H.W.Sladden and Company Limited | Wholesale & retail | 1961 |
| H2 Productions Limited | Administrative & support | 2014 |
| Haaz Ltd | Real estate | 2019 |
| Habanera Marketing Services Ltd | Professional & scientific | 2020 |
| Hachani Ltd | Hospitality | 2026 |
| Hachette Fascicules | | 1998 |
| Haila Health Ltd | Wholesale & retail | 2018 |
| Haines Collection Limited | Wholesale & retail | 2020 |
| Hair International Limited | Other services | 2019 |
| Hair Republic by Emily Ltd | Other services | 2024 |
| Haithemtrans Ltd | Transport & logistics | 2025 |
| Hakim and Shaikh Holdings Limited | Administrative & support | 2023 |
| Hakuhodo UK Limited | Extraterritorial | 1990 |
| Halabala Limited | Wholesale & retail | 2024 |
| Halana Decisions Ltd | Information & communication | 2021 |
| Halbik Holdings Limited | Information & communication | 2020 |
| Hale Travel Group Ltd | Administrative & support | 2025 |
| Halfway Family Estates Limited | Real estate | 2023 |
| Halfway Family Investments Limited | Real estate | 2025 |
| Halfway Investment Properties LLP | | 2025 |
| Hall Outsourcing Limited | Administrative & support | 2024 |
| Halliford Associates Limited | Professional & scientific | 2010 |
| Hallin Ltd | Professional & scientific | 2026 |
| Haloo Ltd | Hospitality | 2025 |
| Halstead Bakery Ltd | Manufacturing | 2025 |
| Hamilkar Ltd | Construction | 2025 |
| Hamilton and Hamilton Property Limited | Real estate | 2026 |
| Hamilton Consulting Limited | Professional & scientific | 1999 |
| Hamilton Court (TN4) RTM Company Limited | Households | 2025 |
| Hamley Developments Limited | Real estate | 2007 |
| Hammer and Trowel Building Services Limited | Construction | 2018 |
| Hammers FX Limited | Professional & scientific | 2023 |
| Hampson Property Developments Ltd | Construction | 2021 |
| Handmade Kitchens.Co.Uk Limited | Real estate | 2002 |
| Hands on Technical Ltd | Information & communication | 2025 |
| Handyband Limited | Administrative & support | 2004 |
| Hannah Marcus Consulting Ltd | Professional & scientific | 2024 |
| Hanover Grand Limited | Real estate | 2017 |
| Hanover Property Holdings Limited | Other services | 2018 |
| Hanover Residence Limited | Real estate | 2017 |
| Hanson Street Estates Limited | Real estate | 2013 |
| Hanson Street Property Investment LLP | | 2014 |
| HAO Dong Ltd | Information & communication | 2018 |
| Happy Cutie Studio Ltd | Wholesale & retail | 2017 |
| Happychipmunk Limited | Real estate | 2020 |
| Harag Ltd | Health & social care | 2025 |
| Harborough Finance Limited | Financial services | 1978 |
| Harbour Demolition Limited | Construction | 2003 |
| Harbour Orthodontic Clinic Holdings Limited | Financial services | 2023 |
| Harbour Orthodontic Clinic Sevices Limited | Health & social care | 2023 |
| Harbour Orthodontic Holdings LLP | | 2023 |
| Harbourfox Ltd | Professional & scientific | 2026 |
| Harding Whiteman Ltd | Professional & scientific | 2018 |
| Hardy Pension Services Limited | Financial services | 2017 |
| Hardy Projects Ltd | Professional & scientific | 2024 |
| Hargate Consulting Limited | Professional & scientific | 2017 |
| Harlands House Management Limited | Households | 2017 |
| Harman Holdings Ltd | Construction | 2016 |
| Harmer Financial Services Limited | Financial services | 2013 |
| Harmony Marketing Ltd | Professional & scientific | 2024 |
| Harmony Telecoms Ltd | Administrative & support | 2005 |
| Harpers Property (UK) Ltd | Construction | 2013 |
| Harpy Valley Limited | Hospitality | 2022 |
| Harrington Heating and Plumbing Ltd | Manufacturing | 2014 |
| Harris Electrical Services (South East) Ltd | Construction | 2012 |
| Harrison Forge Limited | Real estate | 2016 |
| Harrison Technology Solutions Limited | Information & communication | 2024 |
| Harry Lambert Ltd | Other services | 2016 |
| Hartfield Estates Limited | Financial services | 1993 |
| Hartwood Advisory Ltd | Professional & scientific | 2025 |
| Hartwood Group Limited | Professional & scientific | 2018 |
| Harvard Mark Consulting Ltd | Information & communication | 2018 |
| Harvest Agri Limited | Professional & scientific | 2014 |
| Harvest Land Management Group Ltd | Real estate | 2021 |
| Harvey & SON Limited | Households | 2021 |
| Harvey James Investments Holdings Limited | Real estate | 2023 |
| Harvey Wrangles Ltd | Manufacturing | 2026 |
| Harvey's Butchers Ltd | Wholesale & retail | 2023 |
| Hask Limited | Professional & scientific | 2005 |
| Hastings Wine and Coffee Limited | Wholesale & retail | 2024 |
| HAT CC Ltd | Professional & scientific | 2018 |
| Hatch Data Ltd | Information & communication | 2026 |
| Haven City Group Holdings Ltd | Real estate | 2022 |
| Haven City Limited | Professional & scientific | 2022 |
| Haven City Property Management LLP | | 2022 |
| Haven City Services Ltd | Health & social care | 2022 |
| Hawk Cars Limited | Manufacturing | 1992 |
| Hawkenbury Holdings Limited | Financial services | 2025 |
| Hawkesight Data Solutions Ltd | Information & communication | 2025 |
| Hawksbatch Investment Company | Extraterritorial | 2020 |