| Harrowby Lodge Management Company Limited | Households | 2004 |
| Harrowells (NO 220) Limited | Financial services | 2021 |
| Harrowells (NO222) Limited | Financial services | 2021 |
| Harrowells (NO223) Limited | Real estate | 2021 |
| Harrowells 2022 | Financial services | 2022 |
| Harrowells Limited | Professional & scientific | 2014 |
| Harry Dobson Property Ltd | Manufacturing | 2020 |
| Harry Parvin Agricultural Services Ltd | Agriculture & fishing | 2022 |
| Harryjco Ltd | Wholesale & retail | 2025 |
| Harsh Limited | Manufacturing | 1987 |
| Harswell Associates Limited | Professional & scientific | 2025 |
| Hart Property Solutions Limited | Real estate | 2016 |
| Hartley Farming (Yorkshire) Limited | Agriculture & fishing | 2017 |
| Hartley Grange (Whittlesey) Residents Management Company Limited | Households | 2021 |
| Hartley Laird Limited | Professional & scientific | 2013 |
| Hartley Park Limited | Administrative & support | 2007 |
| Hartley Works Ltd | Information & communication | 2025 |
| Hartley's Doors Ltd | Construction | 2025 |
| Hartley's York Ltd | Construction | 2025 |
| Hartleys Food Holdings Limited | Financial services | 2017 |
| Hartleys Plumbing & Heating Engineers Ltd | Construction | 2022 |
| Hartnells Farm Management Company Limited | Households | 2018 |
| Hartswood Holiday Park Limited | Hospitality | 2025 |
| Harvest Moon Confectionery Ltd | Manufacturing | 2014 |
| Harvest Moon Trading Ltd | Manufacturing | 2017 |
| Harvey Richard Limited | Other services | 2002 |
| Harwood-Bye Ltd | Real estate | 2020 |
| Hasholme Limited | Construction | 2019 |
| Hassan Legal Services Ltd | Professional & scientific | 2024 |
| Hassanhidesuk Ltd | Wholesale & retail | 2026 |
| Hassop Properties Limited | Hospitality | 2001 |
| Hastings Place (Bentley) Management Company Limited | Households | 2016 |
| Hatchery Ltd | Construction | 2021 |
| Hatfield Joinery & Building Ltd | Construction | 2023 |
| Hattchar Agri Limited | Agriculture & fishing | 2014 |
| Haul Dean Limited | Transport & logistics | 2022 |
| Haulinads Limited | Professional & scientific | 2006 |
| Haus Wellness Limited | Manufacturing | 2025 |
| Hausin Facilities Management Limited | Administrative & support | 2025 |
| Haut Consulting Group Limited | Wholesale & retail | 2023 |
| Hauxley Grange (Amble) Residents Management Company Limited | Real estate | 2020 |
| Hauxley View (North East) Management Company Limited | Real estate | 2025 |
| Haven Retirement Homes Ltd | Extraterritorial | 1976 |
| Haven Veterinary Group Limited | Professional & scientific | 2014 |
| Havenhands the Bakers Limited | Manufacturing | 2008 |
| Haventhorpe (Developments) Limited | Wholesale & retail | 1986 |
| Haverdell Hospitality Consulting Ltd | Administrative & support | 2025 |
| Havering Properties Limited | Real estate | 2024 |
| Hawes & Co (Thames Ditton) Limited | Real estate | 2011 |
| Hawes & Co Limited | Real estate | 2008 |
| Hawk Furniture Limited | Manufacturing | 1988 |
| Hawley & Partners Limited | Extraterritorial | 2000 |
| Hawre Immigration Service Limited | Professional & scientific | 2025 |
| Hawthorn Chase (Aston Clinton) Residents Management Company Limited | Households | 2017 |
| Hawthorn Mews Limited | Real estate | 2017 |
| Hawthorn Park (Leominster) Management Company Limited | Households | 2024 |
| Hawthorn View Management Company Limited | Households | 2021 |
| Hawthorne-Finch Talent Solutions Ltd | Administrative & support | 2024 |
| Haxby & Wigginton Youth & Community Association | Hospitality | 2004 |
| Haxby Autos Ltd | Wholesale & retail | 2025 |
| Haxby Bakehouse Ltd | Manufacturing | 2023 |
| Haxby Care Limited | Hospitality | 2012 |
| Haxby Group Consulting Limited | Professional & scientific | 2024 |
| Haxby Group Futures Limited | Financial services | 2025 |
| Haxby Group Pharmacy Limited | Health & social care | 2010 |
| Haxby Group Practice Holdings Limited | Professional & scientific | 2012 |
| Haxby Group Training Limited | Education | 2017 |
| Haxby Hungerford Limited | Professional & scientific | 2015 |
| Haxby Martial Arts Limited | Arts & recreation | 2014 |
| Haxby Pilates Limited | Health & social care | 2026 |
| Haxby Pre-Construction Commercial Services Ltd | Professional & scientific | 2020 |
| Haxby Road Management Company Limited | Households | 1992 |
| Haxby Village Ltd | Hospitality | 2025 |
| Hayedeh Ltd | Information & communication | 2023 |
| Hayles Estates Ltd | Real estate | 2018 |
| Hayles Property Developments Limited | Real estate | 2023 |
| Hayley Owen Funerals (York) Limited | Other services | 2019 |
| Haylo Enterprises Limited | Professional & scientific | 2015 |
| Hayrose Cottages Limited | Real estate | 2023 |
| Hayside Holdings Ltd | Financial services | 2015 |
| Hayside Property Ltd | Real estate | 2015 |
| Hayton Homes Limited | Real estate | 2024 |
| Hayton Project Management Ltd | Professional & scientific | 2018 |
| Hayward Electrical (York) Ltd | Construction | 2023 |
| Hayward Smythe Limited | Professional & scientific | 2020 |
| Haywood Heights (Writhlington) Management Company Limited | Households | 2015 |
| Hazardone Ltd | Arts & recreation | 2022 |
| Haze Hair & Beauty Limited | Administrative & support | 2017 |
| Hazel Catering Ltd | Hospitality | 2026 |
| Hazel II Midco 1 Limited | Professional & scientific | 2023 |
| Hazel II Midco 2 Limited | Professional & scientific | 2023 |
| Hazel II Topco Limited | Professional & scientific | 2023 |
| Hazeldene Fold Management Company Limited | Households | 2018 |
| Hazels Development Company Limited | Professional & scientific | 1996 |
| HB Developments (York) Ltd | Construction | 2023 |
| HB Drawing Services Limited | Professional & scientific | 2019 |
| HB Joinery & Building Ltd | Construction | 2021 |
| HBA Events Ltd | Administrative & support | 2019 |
| HBA Graphic Design Ltd | Professional & scientific | 2020 |
| HBG Limited | Administrative & support | 2007 |