| Hassan Energy (UK) Ltd | Administrative & support | 2016 |
| Hatfield & Moor Interiors Limited | Construction | 1996 |
| Hatfield Colliery Partnership Limited | Mining & quarrying | 2013 |
| Hatfield Colliery Propco 2 Limited | Real estate | 2013 |
| Hatfield Colliery Propco 3 Limited | Real estate | 2013 |
| Hatfield Colliery Propco 4 Limited | Real estate | 2013 |
| Hatfield Community Library Limited | Arts & recreation | 2014 |
| Hatfield Dental Care Limited | Health & social care | 2014 |
| Hatfield Mini Market Limited | Wholesale & retail | 2026 |
| Hatfield Property Development Limited | Construction | 2026 |
| Hattersley Property Investments Ltd | Real estate | 2016 |
| Hatty's Tea Room Ltd | Hospitality | 2024 |
| Haulage Doncaster Ltd | Transport & logistics | 2024 |
| Haulyeah Transport Ltd | Transport & logistics | 2025 |
| Haven Children's Services Limited | Health & social care | 2023 |
| Haven House Group Limited | Real estate | 2023 |
| Havenrent Ltd | Real estate | 2025 |
| Hawker Properties Limited | Real estate | 2023 |
| Hawkes Capital Ltd | Professional & scientific | 2025 |
| Hawkswift Ltd | Professional & scientific | 2019 |
| Hawleys Electrical Limited | Construction | 2012 |
| Hawo Property Ltd | Real estate | 2017 |
| Hawthorn Group Holdings Limited | Professional & scientific | 2018 |
| Hawthorn Property Renovations Limited | Construction | 2025 |
| Hawthorne Contract Services Limited | Information & communication | 2006 |
| Hawthorne Holidays Limited | Hospitality | 2018 |
| Hawthorne Meadows Homes Limited | Construction | 2020 |
| Hawthorne Meadows Management Company Limited | Real estate | 2019 |
| Haxbox Ltd | Transport & logistics | 2019 |
| Haxby's Park Homes Limited | Real estate | 2005 |
| Haxey Properties Limited | Hospitality | 2021 |
| HAY Green Education Limited | Professional & scientific | 2006 |
| HAY Traditional Turkish Barber Ltd | Other services | 2022 |
| Hayes Building Supplies Limited | Construction | 2020 |
| Hayes Hough Consultancy Ltd | Real estate | 2020 |
| Hayes Hough Property Services Ltd | Real estate | 2020 |
| Hayes Residential Lettings Limited | Real estate | 2010 |
| Hayes Venetian Ltd | Construction | 2025 |
| Hayfield Green Residents Company Limited | Households | 1997 |
| Hayfield Heating Limited | Construction | 2019 |
| Hayfield Joinery Limited | Construction | 2023 |
| Hayfield Landscaping Ltd | Administrative & support | 2025 |
| Hayfield Village Residents Company Limited | Households | 1997 |
| Hayjam Limited | Construction | 1997 |
| Hayley Ellis Services Ltd | Other services | 2019 |
| Haysan Enterprise Ltd | Professional & scientific | 2026 |
| Hayselden Select Limited | Wholesale & retail | 2015 |
| Haywagon Limited | Hospitality | 2009 |
| Haywood Ventures Ltd | Real estate | 2022 |
| Hazal Estate Limited | Real estate | 2021 |
| HB HR Consulting Ltd | Professional & scientific | 2015 |
| HBE Energy UK Ltd | Manufacturing | 2025 |
| HBR Properties Limited | Households | 2003 |
| HCC Management Ltd | Real estate | 2023 |
| HCL Holdco Limited | Financial services | 2013 |
| Hcomm Limited | Information & communication | 2012 |
| HD Global Athlete Management Ltd | Professional & scientific | 2022 |
| HD Performance Centre Ltd | Arts & recreation | 2021 |
| HD Property Maintenance Limited | Construction | 2016 |
| Hdfh Ltd | Professional & scientific | 2025 |
| Head Hospitality Ltd | Administrative & support | 2022 |
| Head New Build Cleaning Ltd | Administrative & support | 2026 |
| Head on Trading Limited | Administrative & support | 2024 |
| Head Over Wheels CIC | Arts & recreation | 2025 |
| Headcount Ltd | Extraterritorial | 2022 |
| Heads for Business Ltd | Professional & scientific | 2012 |
| Heads UP Music Limited | Arts & recreation | 2019 |
| Headway Scaffold Ltd | Construction | 2020 |
| Health and Safety Sign Association Limited | Professional & scientific | 2013 |
| Health Check Today Ltd | Administrative & support | 2023 |
| Healthineself Ltd | Extraterritorial | 2013 |
| Healthsaver Limited | Financial services | 2002 |
| Healthwise & General Ltd | Health & social care | 2013 |
| Healthy HER South Yorkshire CIC | Education | 2026 |
| Healthy Tree Studio Ltd | Health & social care | 2025 |
| Heart and Mind Healthcare Ltd | Health & social care | 2025 |
| Heart in Home Care Ltd | Health & social care | 2025 |
| Heart of Gold Care Services Ltd | Health & social care | 2019 |
| Hearts and Hooves Rescue Centre CIC | Agriculture & fishing | 2024 |
| Hearts in Healing CIC | Health & social care | 2025 |
| Heat Local Ltd | Construction | 2020 |
| Heat Pump Energy Ltd | Construction | 2020 |
| Heath & Turner Properties Ltd | Real estate | 2024 |
| Heath PUB Company Limited | Other services | 2022 |
| Heather Publishing Ltd | Information & communication | 2024 |
| Heatherfields ERP Limited | Information & communication | 2019 |
| Heathfield Place Property Management Company Limited | Households | 2019 |
| Heatley Builders Limited | Construction | 2024 |
| Heatology Renewables Ltd | Construction | 2026 |
| Heatpology Renewables Ltd | Construction | 2026 |
| Heaven Garden Ltd | Hospitality | 2022 |
| Heaven House Ltd | Hospitality | 2025 |
| Heaven.Hq Ltd | Other services | 2023 |
| Heavenly Soles by Katie Ltd | Health & social care | 2022 |
| Heavenx Ltd | Wholesale & retail | 2025 |
| Heavey Estates Ltd | Construction | 2018 |
| Heavy Goods Labour Ltd | Transport & logistics | 2025 |
| HEB Group Cleaning & Hygiene Ltd | Administrative & support | 2001 |
| Heba Trading Ltd | Administrative & support | 2018 |
| Hebblewhite Limited | Agriculture & fishing | 2000 |