| Hallam Park Estates (Finningley) Ltd | Construction | 2022 |
| Hallam Park Estates Limited | Construction | 2019 |
| Hallamshire Hardmetal Products Limited | Manufacturing | 1996 |
| Hallamtrads Ltd | Information & communication | 2019 |
| Hallen Property Maintenance Ltd | Construction | 2025 |
| Hallgarth Property Ltd | Real estate | 2025 |
| Hallmark Assay Ltd | Wholesale & retail | 2011 |
| Halo Cars Ltd | Wholesale & retail | 2019 |
| Hames Homes Ltd | Real estate | 2019 |
| Hamilton Homes Limited | Real estate | 2024 |
| Hamilton Homes Yorkshire Limited | Real estate | 2025 |
| Hampton Knightsbridge Limited | Professional & scientific | 2012 |
| Hamptons Floor Store Limited | Wholesale & retail | 2025 |
| Hamshaw 888 Defender Security Limited | Administrative & support | 2023 |
| Hamstrasse Developments Limited | Construction | 2022 |
| Hamzu Limited | Health & social care | 2014 |
| Hana's Houses Ltd | Real estate | 2014 |
| Handlepass Limited | Hospitality | 1986 |
| Handrail Solutions (UK) Limited | Manufacturing | 2003 |
| Hands on Rother Ltd | Wholesale & retail | 2016 |
| Handsworth Developments Limited | Real estate | 2017 |
| Handy Solutions Home Improvements Ltd | Construction | 2025 |
| Haner Solutions Limited | Wholesale & retail | 2023 |
| Hanif Bros Construction LLP | | 2019 |
| Hanitec Limited | Construction | 2024 |
| Hannah Walker Media Limited | Arts & recreation | 2021 |
| Hannah's Nana's Kitchen Ltd | Hospitality | 2022 |
| Hannex Fitout Ltd | Construction | 2025 |
| Happy Garden (Rotherham) Ltd | Hospitality | 2026 |
| Happy Hearts Childminders Limited | Health & social care | 2025 |
| Happy Trading Ltd | Wholesale & retail | 2009 |
| Harbco Calibrations Ltd | Wholesale & retail | 2025 |
| Harbco Ltd | Wholesale & retail | 2023 |
| Hardcore Human Resources Ltd. | Professional & scientific | 2014 |
| Hardmetal Products Holdings Limited | Manufacturing | 2018 |
| Hardmetal Products Limited | Manufacturing | 2008 |
| Hardscapes Garden Design Ltd | Administrative & support | 2022 |
| Hardwick Bennett Lettings Limited | Real estate | 2016 |
| Hardwicks Limited | Extraterritorial | 2003 |
| Harleo Property Services Limited | Manufacturing | 2022 |
| Harley Group Investments Ltd | Real estate | 2024 |
| Harley Village Mission Rooms Trust | Arts & recreation | 2004 |
| Harmony Coaching & Creations Ltd | Information & communication | 2024 |
| Harriet Homes Limited | Real estate | 2022 |
| Harris Services Rotherham Ltd | Transport & logistics | 2019 |
| Harrison's 2023 Ltd | Hospitality | 2023 |
| Harrisonbale Cars Limited | Wholesale & retail | 2025 |
| Harrisons Antiques Limited | Wholesale & retail | 2006 |
| Harrisons Sales Ltd | Wholesale & retail | 2025 |
| Harry VON Limited | Real estate | 2025 |
| Harrys AAG Limited | Administrative & support | 2021 |
| Harrys Excavation Limited | Construction | 2018 |
| Harrys Grab Ltd | Water & waste | 2022 |
| Harrys Property Portfolio Limited | Real estate | 2026 |
| Hart Health Ltd | Other services | 2024 |
| Hart.Elec. Ltd | Construction | 2013 |
| Harthill Financial Services Ltd | Financial services | 2025 |
| Hartron Limited | Professional & scientific | 2026 |
| Harts of Braithwell Ltd | Hospitality | 2025 |
| Hartshaw Management Company Limited | Households | 2005 |
| Harvest Healthcare Limited | Manufacturing | 2010 |
| Harvey Hs&E Consulting Ltd | Professional & scientific | 2025 |
| Harveys Hair Beauty and Tanning Ltd | Other services | 2023 |
| Harworth BNG (Allerton Bywater) Limited | Real estate | 2025 |
| Harworth BNG (Gascoigne) Limited | Real estate | 2025 |
| Harworth BNG (Killamarsh) Limited | Real estate | 2025 |
| Harworth BNG (Sedgebrook) Limited | Real estate | 2025 |
| Harworth BNG (Thorne) Limited | Real estate | 2025 |
| Harworth Catalyst 1 Limited | Real estate | 2021 |
| Harworth Dawley Road Limited | Energy | 2021 |
| Harworth Development Holdco Limited | Financial services | 2025 |
| Harworth Estates (Agricultural Land) Limited | Construction | 1993 |
| Harworth Estates (Waverley Prince) Ltd. | Construction | 1995 |
| Harworth Estates Curtilage Limited | Real estate | 2012 |
| Harworth Estates Investments Limited | Construction | 2011 |
| Harworth Estates Limited | Administrative & support | 1987 |
| Harworth Estates Mines Property Limited | Real estate | 2012 |
| Harworth Estates NO 2 Limited | Real estate | 1984 |
| Harworth Estates Northumberland Woodland Limited | Agriculture & fishing | 2023 |
| Harworth Estates Overage Limited | Real estate | 2012 |
| Harworth Estates Property Group Limited | Real estate | 2012 |
| Harworth Estates Warwickshire Ltd | Construction | 2006 |
| Harworth Gateway 45 LLP | | 2007 |
| Harworth Group PLC | Professional & scientific | 1991 |
| Harworth I&L Development Management Limited | Real estate | 2025 |
| Harworth Investments Holdco Limited | Financial services | 2022 |
| Harworth Legacy Holdco Limited | Financial services | 1989 |
| Harworth Management Shelfco Limited | Extraterritorial | 2025 |
| Harworth Partnerships Holdco Limited | Financial services | 2025 |
| Harworth PPA Holdco Limited | Extraterritorial | 2024 |
| Harworth PPA NO 1 Limited | Extraterritorial | 2024 |
| Harworth PPA NO 2 Limited | Real estate | 2025 |
| Harworth Regeneration Limited | Real estate | 1991 |
| Harworth Residential Development Management Limited | Construction | 2022 |
| Harworth Strategic Land Holdco Limited | Financial services | 2025 |
| Harworth Surface Water Management (Bardon) Limited | Water & waste | 2022 |
| Harworth Surface Water Management (Chatterley Park) Limited | Water & waste | 2025 |
| Harworth Surface Water Management (North West) Limited | Water & waste | 2016 |
| Harworth TRR Limited | Mining & quarrying | 2014 |
| Hasib Radiology Solutions Ltd | Health & social care | 2026 |