| Gwenau Hapus Ltd | Health & social care | 2023 |
| Gwjb Limited | Manufacturing | 2010 |
| GWS Financial Planning Limited | Financial services | 2025 |
| GWT Building Services Limited | Construction | 2017 |
| Gymnasium Equipment Maintenance Services Limited | Manufacturing | 2003 |
| H & a (Marketing) Limited | Professional & scientific | 1996 |
| H & H Estates (York) Limited | Real estate | 2019 |
| H Barker & SON Limited | Agriculture & fishing | 2002 |
| H Bradshaw's Limited | Wholesale & retail | 2005 |
| H C Controls Limited | Manufacturing | 2001 |
| H Colls Direct Ltd | Wholesale & retail | 2025 |
| H F Chocolates Limited | Wholesale & retail | 2004 |
| H H Direct Limited | Construction | 2008 |
| H Hall Limited | Construction | 2000 |
| H L Clarke PMO Consultancy Ltd | Administrative & support | 2014 |
| H P & Sons Holdings Limited | Health & social care | 2025 |
| H R Fell & Sons Holdings Limited | Financial services | 2021 |
| H R M Group Limited | Financial services | 2006 |
| H T and SON Properties Limited | Real estate | 2024 |
| H W Cowling Ltd | Construction | 2004 |
| H Waines & SON Ltd | Wholesale & retail | 2010 |
| H&H Homes Limited | Real estate | 2020 |
| H&K Barbers York Ltd | Other services | 2025 |
| H&S Properties York Ltd | Real estate | 2019 |
| H.P.H.V. Limited | | 1939 |
| H.R.Properties(Newcastle)Limited | Real estate | 1958 |
| H2 Landscape Planning Partnership Limited | Administrative & support | 2006 |
| H2 Management Consulting Ltd | Professional & scientific | 2007 |
| H2 Pure Life Ltd | Other services | 2026 |
| H2 Rail Engineering Limited | Professional & scientific | 2016 |
| H2 Trade Solutions Ltd | Administrative & support | 2026 |
| H214 Limited | Real estate | 2013 |
| H2H Resources Ltd | Professional & scientific | 2004 |
| H2O Bathrooms York Limited | Construction | 2022 |
| H2O Event Services Ltd. | Construction | 2024 |
| H3 Advisory Partners Ltd | Professional & scientific | 2026 |
| HA King Limited | Health & social care | 2024 |
| Haaris Homes Ltd | Real estate | 2024 |
| Hadaway Hounds Ltd | Wholesale & retail | 2023 |
| Haddon Evolve Limited | Professional & scientific | 2022 |
| Hadfield Homes and Property Management Ltd | Real estate | 2025 |
| Hadfield Relocation Group Limited | Transport & logistics | 2018 |
| Hadouken Digital Ltd | Information & communication | 2022 |
| Hadrian Vets Limited | Extraterritorial | 2011 |
| Hagrapat Drainage and Civils Ltd | Construction | 2017 |
| Hague & Dixon LLP | | 2016 |
| HAI Technology Systems Ltd | Information & communication | 2026 |
| Haig Agencies Limited | Other services | 2010 |
| Haigh Elearning Limited | Education | 2021 |
| Haigh Transport & Crane Hire Ltd | Transport & logistics | 2018 |
| Hailes Wood (Elsenham) Residents Management Company Limited | Households | 2015 |
| Hair at Number 20 Limited | Other services | 2021 |
| Hair Studio (Pocklington) Limited | Other services | 2003 |
| Hakewill Mews (Thurston) Residents Management Company Limited | Households | 2025 |
| HAL Nominee 1 Limited | Financial services | 2021 |
| HAL Nominee 2 Limited | Financial services | 2021 |
| Halberd Limited | Manufacturing | 2018 |
| Halcyon Court (Yorkshire) Ltd | Extraterritorial | 1990 |
| Hale Portfolio Limited | Professional & scientific | 2017 |
| Hale Veterinary Group Limited | Extraterritorial | 2014 |
| Half Inch Limited | Professional & scientific | 2018 |
| Half Moon Brewery Ltd | Manufacturing | 2013 |
| Half Moon Development Limited | Real estate | 1989 |
| Halifax Estate Nominees 1 Limited | Financial services | 2019 |
| Halifax Estate Nominees 2 Limited | Financial services | 2019 |
| Hall & Associates (Marketing) Ltd | Manufacturing | 1988 |
| Hall & Featherstone Limited | Construction | 2004 |
| Hall and Gates Ltd | Hospitality | 2017 |
| Hall Farm Holdings Limited | Hospitality | 2019 |
| Hall Garth Consulting Ltd | Professional & scientific | 2020 |
| Hall Garth Estates Ltd | Real estate | 2024 |
| Hall Lodge Group Limited | Financial services | 2023 |
| Hall Maintenance Services Limited | Other services | 2018 |
| Hall of Fame Brands Ltd | Professional & scientific | 2023 |
| Hall Plumbing Limited | Construction | 2022 |
| Hall Property Holdings Ltd | Real estate | 2025 |
| Hallco 1766 Limited | Professional & scientific | 2010 |
| Hallcomm Ltd | Professional & scientific | 2022 |
| Hallfield Road Management Company Limited | Households | 2020 |
| Hallfield Road Motors Limited | Wholesale & retail | 2023 |
| Hallgarth Wealth Planning (Yorkshire) Ltd | Financial services | 2019 |
| Halloween & Scare Attraction Association | Other services | 2021 |
| Hallstone Developments Limited | Water & waste | 1995 |
| Halo 2 Management Company Limited | Households | 2015 |
| Halo 3 Management Company Limited | Households | 2015 |
| Halo 4 Management Company Limited | Households | 2016 |
| Halo 7 Management Company Limited | Households | 2016 |
| Halo Effect Marketing Ltd | Professional & scientific | 2019 |
| Halobase Ltd | Information & communication | 2025 |
| Halyard Productions Limited | Information & communication | 2007 |
| HAM & Firkin Limited | Hospitality | 2021 |
| Hambleton HR Limited | Wholesale & retail | 2007 |
| Hambleton Landscapes Limited | Administrative & support | 2023 |
| Hambleton Management Services Ltd | Professional & scientific | 1996 |
| Hambleton Pathology Services Limited | Health & social care | 2015 |
| Hambleton Project Services Ltd | Professional & scientific | 2014 |
| Hambleton Property Developers Ltd | Construction | 2024 |
| Hambleton Racing Limited | Other services | 2006 |
| Hambleton Risk Management Limited | Professional & scientific | 1988 |
| Hamilton Gate (Frinton) Residents Management Company Limited | Households | 2015 |