| Homehunters Property Management Limited | Real estate | 1991 |
| Homelets Limited | Real estate | 1998 |
| Homeowner Equity Options Limited | Financial services | 2015 |
| Homes (UK) Limited | Information & communication | 1995 |
| Homes 3D Printing Limited | Construction | 2024 |
| Homes by Hopkins Limited | Real estate | 2020 |
| Homes by Platinum Ltd | Real estate | 2018 |
| Homes on Gower Limited | Construction | 2020 |
| Homilex Limited | Real estate | 2005 |
| HON Shen Limited | Wholesale & retail | 2010 |
| Honest Storage Ltd | Administrative & support | 2026 |
| Honey BEE Cobblers Ltd | Wholesale & retail | 2013 |
| Honeyaero Limited | Real estate | 1990 |
| Hong Kong Gourmet Enterprise Limited | Hospitality | 2024 |
| Hoo-Gah Ltd | Hospitality | 2017 |
| Hooke Plumbing & Heating Ltd | Construction | 2013 |
| Hookey Services Limited | Wholesale & retail | 2021 |
| Hooper FS Ltd | Professional & scientific | 2022 |
| Hoopers Agricultural Plant Services Limited | Administrative & support | 2025 |
| Hoots Before and After School Club Limited | Administrative & support | 2004 |
| Hoowla Limited | Information & communication | 2013 |
| Hope and Light Coffee House CIC | Hospitality | 2024 |
| Hopeful Horizons Family Assessment and Support Service Ltd | Administrative & support | 2023 |
| Hopkin Holdings Limited | Financial services | 2025 |
| Hopkins & Robb Homes Ltd | Real estate | 2026 |
| Hopkins LOG Burners Ltd | Wholesale & retail | 2023 |
| Hopsea Limited | Construction | 2017 |
| Hoptec Limited | Construction | 2008 |
| Hoptech Ltd | Professional & scientific | 2017 |
| Horizon Academic Group Limited | Education | 2026 |
| Horizon Air LLP | | 2005 |
| Horizon Data House Ltd | Information & communication | 2014 |
| Horizon Property Holdings Ltd | Real estate | 2025 |
| Horizon Strength & Fitness Ltd | Arts & recreation | 2024 |
| Horizon Support Services Limited | Education | 2009 |
| Horizon Windows Limited | Construction | 2014 |
| Horner Properties Ltd | Construction | 2024 |
| Horsnell Consultancy Ltd | Administrative & support | 2015 |
| Hospitalidade Limited | Professional & scientific | 2026 |
| Hospitium UK Ltd | Professional & scientific | 2021 |
| Hot Dog Surf Shop Limited | Wholesale & retail | 2002 |
| Hotdogs 4T Limited | Wholesale & retail | 2022 |
| Hotel Management Solutions Limited | Hospitality | 2020 |
| Hotel Outlaw Ltd | Information & communication | 2025 |
| Hotpod Yoga Swansea Limited | Arts & recreation | 2013 |
| Hound Security Ltd | Construction | 2018 |
| House 9 Property Limited | Real estate | 2023 |
| House of Bombaka (HOB) Limited | Education | 2022 |
| House of Obsidian Limited | Professional & scientific | 2025 |
| House of Trades Ltd | Construction | 2018 |
| House Pour Spirits Limited | Wholesale & retail | 2025 |
| House Vault Limited | Information & communication | 2019 |
| Housechoice Limited | Construction | 2010 |
| Housetech Home Improvements Ltd | Construction | 2021 |
| Howard and Palmer Limited | Wholesale & retail | 1989 |
| Howards Removals & Deliveries Ltd | Transport & logistics | 2017 |
| Howells Butchers Limited | Wholesale & retail | 2003 |
| Howells Consulting Engineering Limited | Construction | 2005 |
| Howells James Limited | Real estate | 2006 |
| Howells Network Systems Ltd | Information & communication | 2011 |
| Howells Neuroimaging Limited | Health & social care | 2017 |
| Howells Reach Limited | Administrative & support | 2024 |
| Howells SW Properties Ltd | Real estate | 2025 |
| Howells Total Maintenance Services Ltd | Real estate | 2023 |
| Howie David (Commercials) Limited | Wholesale & retail | 1980 |
| Howie Hire Limited | Administrative & support | 2002 |
| Howzat Catering & Events Limited | Hospitality | 2026 |
| HPC Axis Ltd | Wholesale & retail | 2025 |
| HPL (Wales) Limited | Construction | 2014 |
| HPT Consulting Ltd | Information & communication | 2023 |
| HQ Auto Services Ltd | Wholesale & retail | 2006 |
| HR Depot Ltd | Administrative & support | 2024 |
| HR Flooring Limited | Construction | 2018 |
| HR Properties (South Wales) Ltd | Real estate | 2022 |
| Hras Properties Ltd | Real estate | 2024 |
| Hs&S Traders Limited | Wholesale & retail | 2026 |
| HSD Properties Limited | Real estate | 2004 |
| HSJ Consultancy Limited | Professional & scientific | 2008 |
| HSM PVT Ltd | Information & communication | 2015 |
| HSM3 Property Limited | Other services | 2017 |
| HST CTV1 Ltd | Transport & logistics | 2023 |
| HST CTV10 Ltd | Transport & logistics | 2023 |
| HST CTV11 Ltd | Transport & logistics | 2023 |
| HST CTV12 Ltd | Transport & logistics | 2023 |
| HST CTV13 Ltd | Transport & logistics | 2023 |
| HST CTV14 Ltd | Transport & logistics | 2023 |
| HST CTV15 Ltd | Transport & logistics | 2023 |
| HST CTV16 Ltd | Transport & logistics | 2023 |
| HST CTV17 Ltd | Transport & logistics | 2023 |
| HST CTV18 Ltd | Transport & logistics | 2023 |
| HST CTV19 Ltd | Transport & logistics | 2023 |
| HST CTV2 Ltd | Transport & logistics | 2023 |
| HST CTV20 Ltd | Transport & logistics | 2023 |
| HST CTV21 Ltd | Transport & logistics | 2023 |
| HST CTV22 Ltd | Transport & logistics | 2023 |
| HST CTV23 Ltd | Transport & logistics | 2023 |
| HST CTV24 Ltd | Transport & logistics | 2023 |
| HST CTV25 Ltd | Transport & logistics | 2023 |
| HST CTV3 Ltd | Transport & logistics | 2023 |
| HST CTV4 Ltd | Transport & logistics | 2023 |