| Heatplan GAS Heating & Plumbing Limited | Construction | 2004 |
| Heatwave Heating & Plumbing Limited | Construction | 2017 |
| Heavy Industry Ltd | Professional & scientific | 2020 |
| Hebei Cofco UK Company Limited | Wholesale & retail | 2019 |
| Hebemo Limited | Arts & recreation | 2016 |
| Hebron Abraham Elias and Sons Strategy Patrouillards Limited | Wholesale & retail | 2017 |
| Hebron Homes Ltd | Real estate | 2026 |
| Heckington Store Ltd | Wholesale & retail | 2018 |
| Hectogon Limited | Information & communication | 2015 |
| Heddon Computing Limited | Information & communication | 1994 |
| Hedley Tiling Solutions Ltd | Construction | 2024 |
| Heego Community Welfare ACT Limited | Health & social care | 2022 |
| Heema Ltd | Transport & logistics | 2025 |
| Hegedus Trades Limited | Construction | 2026 |
| Hegla Machinery (UK) Ltd | Wholesale & retail | 2002 |
| Heightened Sense Dog Company Ltd | Other services | 2026 |
| Heirs Alliance Limited | Wholesale & retail | 2018 |
| Heka Innovations Exports Ltd | Wholesale & retail | 2025 |
| Heled Ltd | Information & communication | 2023 |
| Helen LAM Studio Ltd | Professional & scientific | 2025 |
| Helen Mackay Building Ltd | Construction | 2024 |
| Helen Scott Associates Ltd | Professional & scientific | 2015 |
| Helen's Executive Travel Ltd | Transport & logistics | 2023 |
| Helga Davies Consultancy Limited | Information & communication | 2007 |
| Heli Ltd | Professional & scientific | 2009 |
| Heliodoor Ltd | Real estate | 2022 |
| Helios Electrical and Solar Limited | Construction | 2024 |
| Helios Props Limited | Real estate | 2019 |
| Helix Consults Limited | Information & communication | 2011 |
| Hellasweet Ltd | Wholesale & retail | 2019 |
| Hellexis Ltd | Wholesale & retail | 2025 |
| Hello Gorgeous Ltd. | Wholesale & retail | 2014 |
| Hello Living Ltd | Administrative & support | 2023 |
| Hellraisers Ltd | Arts & recreation | 2024 |
| Helm Construction Limited | Construction | 2014 |
| Helming Ventures Limited | Administrative & support | 2013 |
| Helmpride Ltd | Real estate | 1999 |
| Helmpride Services Ltd | Administrative & support | 1999 |
| Help Hub C.I.C. | Other services | 2025 |
| Help to Manage Limited | Agriculture & fishing | 2024 |
| Help Ukraine Bamk UK CIC | Health & social care | 2024 |
| Helphandles Ltd | Information & communication | 2006 |
| Helping Businesses Ltd | Professional & scientific | 2025 |
| Helping Hand Care Ltd | Health & social care | 2025 |
| Helpmagic Limited | Information & communication | 1999 |
| Helpmeuk Ltd | Administrative & support | 2019 |
| Helsten Limited | Administrative & support | 2009 |
| Hemish Patel Services Ltd | Health & social care | 2024 |
| Hemwalk Limited | Wholesale & retail | 1993 |
| Henkevi Engineering Services Limited | Construction | 2008 |
| Henlaw Ltd | Hospitality | 2018 |
| Henlow Camp Property Co. Limited | Construction | 1977 |
| Henlu Limited | Administrative & support | 2017 |
| Hennellys Services Limited | Construction | 2023 |
| Henry and Ward LLP | | 2025 |
| Henry Britton Ltd | Real estate | 2021 |
| Hens for Hire Limited | Agriculture & fishing | 2011 |
| Henshaw House Silbury Ltd | Real estate | 2022 |
| Hensler Associates Limited | Wholesale & retail | 2003 |
| Heptagon-Uk Ltd | Information & communication | 2020 |
| Hera Fleet Compliance Ltd | Transport & logistics | 2026 |
| Herb the Accountant Ltd | Professional & scientific | 2022 |
| Herbertmk Ltd | Wholesale & retail | 2023 |
| Herbwhisperer Ltd. | Health & social care | 2023 |
| Herdwick NO9 Limited | Real estate | 2023 |
| Hereward Farms Limited | Agriculture & fishing | 1997 |
| Herfleet Ltd | Transport & logistics | 2025 |
| Heritage & Stone Heating Limited | Construction | 2023 |
| Heritage Commodities Ltd | Wholesale & retail | 2025 |
| Heritage Development Consultants Ltd | Professional & scientific | 2012 |
| Heritage Floors and Decor Limited | Construction | 2015 |
| Heritage Glass and Glazing Ltd | Construction | 2018 |
| Heritage Motor Collective Ltd | Administrative & support | 2025 |
| Heritage of India Ltd | Wholesale & retail | 2013 |
| Hermitage Beauty Limited | Wholesale & retail | 2017 |
| Hero NET Zero Ltd | Wholesale & retail | 2024 |
| Heron Supplies Limited | Wholesale & retail | 1996 |
| Herschel Ross Consultancy Ltd | Real estate | 2017 |
| Hertfordshire Brickwork Limited | Construction | 2017 |
| Hertfordshire Growers Limited | Agriculture & fishing | 2014 |
| Hertfordshire Organic Growers Limited | Agriculture & fishing | 1994 |
| Hertsview Surveys Ltd | Professional & scientific | 2016 |
| Hertz Geosolutions Ltd | Mining & quarrying | 2016 |
| HES Services Support Ltd | Education | 2024 |
| Hesdin Driveways Limited | Households | 2021 |
| Hesdin Estate Limited | Hospitality | 2022 |
| Hesdin Hall Limited | Construction | 2019 |
| Hesperus Associates Limited | Real estate | 2004 |
| Hessentech-Business Systems & Solutions Limited | Professional & scientific | 2019 |
| Hestabit Limited | Information & communication | 2019 |
| Hestia Home & Property Care Limited | Real estate | 2026 |
| Hesuk Limited | Construction | 2025 |
| Hetoimos Ltd | Manufacturing | 2023 |
| HEW Associates Limited | Education | 2010 |
| Hewale Ltd | Health & social care | 2026 |
| Hexa Health Ltd. | Health & social care | 2015 |
| Hexagon Films Limited | Information & communication | 2021 |
| Hexagon Recruitment Partners Ltd | Administrative & support | 2024 |
| HEY Keelin Creative Ltd | Professional & scientific | 2022 |
| HEY Presto Services Ltd | Real estate | 2022 |