| Hookshot Media Ltd | Information & communication | 2010 |
| Hootels Ltd | Administrative & support | 2026 |
| Hope Cafe Shepshed T/A Miracle Cafe C.I.C. | Hospitality | 2024 |
| Hope Fostering Services Limited | Health & social care | 2007 |
| Hopewell Firm Ltd | Professional & scientific | 2024 |
| Hopkinscleaning Ltd | Administrative & support | 2025 |
| Hopwood Motorsport Ltd | Wholesale & retail | 2018 |
| Horizon 10 Ltd | Real estate | 2019 |
| Horizon Property Limited | Real estate | 2017 |
| Horler Tax Ltd | Professional & scientific | 2012 |
| Horler Tax Services Limited | Professional & scientific | 2015 |
| Horse and Carriage Masters Limited | Other services | 2017 |
| Hospitality Digital Services Limited | Information & communication | 2019 |
| Hoss Shoes Limited | Agriculture & fishing | 2012 |
| Hot Melt Services Limited | Wholesale & retail | 2009 |
| Hot TEN TOT Clothing Limited | Manufacturing | 2003 |
| Hot TEN TOT Development Company Limited | Construction | 2006 |
| Hot TUB Chemical Controllers Ltd | Manufacturing | 2021 |
| Hotbox 1 Ltd | Hospitality | 2024 |
| Hoteles Limited | Administrative & support | 2011 |
| Hothorpe Hall (Estate) Limited | Financial services | 2021 |
| Hotpod Yoga Loughborough Limited | Arts & recreation | 2019 |
| Hottubrepairsolutions Ltd | Other services | 2022 |
| Hour Escape Ltd | Arts & recreation | 2015 |
| Hous Holdings Limited | Real estate | 2021 |
| Housden Homes Limited | Construction | 2002 |
| Housden IT Services Limited | Information & communication | 2017 |
| House M8S Ltd | Real estate | 2019 |
| House of Claude Ltd | Real estate | 2024 |
| Housingai Ltd | Information & communication | 2025 |
| Howard 2012 Limited | Administrative & support | 2012 |
| Howard Gaskin Design Development Limited | Professional & scientific | 2016 |
| Howard Scale Co. Limited(The) | Manufacturing | 1958 |
| Howard Scales Ltd | Manufacturing | 2012 |
| Howard-Brumlich Events Ltd | Education | 2024 |
| HOWARD2012 Properties Ltd | Real estate | 2017 |
| Howell & Co (Leicester) Limited | Professional & scientific | 2008 |
| Hoxston Edwalton Limited | Construction | 2020 |
| Hoxston Investments Limited | Real estate | 2022 |
| Hoxston Ltd | Construction | 1997 |
| Hoyes Asset Management Limited | Administrative & support | 2018 |
| Hoyes Ltd | Construction | 2009 |
| Hoyes Scaffolding Ltd | Construction | 2017 |
| Hpwll Media Ltd | Information & communication | 2026 |
| HR1.FARM Limited | Manufacturing | 2020 |
| Hris Cloud Consulting Ltd | Information & communication | 2022 |
| Hrmgw Holdings Limited | Real estate | 2023 |
| HRS Care Limited | Health & social care | 2012 |
| Hsgoods Ltd | Wholesale & retail | 2025 |
| HSH Plumbing Ltd | Construction | 2025 |
| Hu-Let Properties Limited | Real estate | 2019 |
| Hubcloud Ltd | Information & communication | 2012 |
| Hubpix Limited | Information & communication | 2018 |
| Hughes Solutions Group Ltd | Construction | 2026 |
| Human Applications Limited | Administrative & support | 1992 |
| Human Consciousness Forum Ltd | Other services | 2022 |
| Human EDI Ltd | Professional & scientific | 2023 |
| Human Kind Leadership Ltd | Professional & scientific | 2016 |
| Human Wellness Forum Ltd | Other services | 2023 |
| Humane Technology Limited | Professional & scientific | 1982 |
| Humanise Design Limited | Professional & scientific | 2012 |
| Huntleys Estate Agents Limited | Real estate | 2016 |
| Hustle Properties Limited | Households | 2023 |
| Hustle Property Services Limited | Construction | 2024 |
| HVO Consultancy Ltd | Professional & scientific | 2017 |
| HW1 Performance Ltd | Arts & recreation | 2022 |
| Hydraulics Spares Limited | Wholesale & retail | 2024 |
| Hydroworld CL Ltd | Wholesale & retail | 2019 |
| Hydrus Group Limited | Extraterritorial | 2009 |
| Hygieia Scientific Limited | Wholesale & retail | 2024 |
| Hygiene and Therapy Services Ltd | Health & social care | 2023 |
| Hymans Amusements Ltd | Arts & recreation | 2024 |
| Hype Electric Ltd | Wholesale & retail | 2020 |
| Hytc Ltd | Information & communication | 2020 |
| Hyve Developments Limited | Extraterritorial | 2016 |
| Hæven Group Ltd | Real estate | 2025 |
| Hæven Ltd | Real estate | 2025 |
| I R Harris Limited | Manufacturing | 2011 |
| I ROB (UK) Holdings Limited | Financial services | 2015 |
| I&R Auto Services Ltd | Wholesale & retail | 2026 |
| I-Post Services Ltd | Transport & logistics | 2017 |
| I. ROB (UK) Limited | Information & communication | 1999 |
| I.P. Investments Limited | Financial services | 2010 |
| I.P.A. Controls Limited | Manufacturing | 2002 |
| I.S. Sundries Limited | Wholesale & retail | 2015 |
| Iama Herbs Ltd | Agriculture & fishing | 2020 |
| IAN Bruce Builder Limited | Construction | 2001 |
| IAN Hill Solutions Limited | Other services | 2015 |
| IAN Monk Limited | Professional & scientific | 2014 |
| IAN Price Farms Limited | Agriculture & fishing | 2020 |
| Iantz Limited | Information & communication | 2021 |
| IAV Construction Ltd | Construction | 2026 |
| IB Group Ltd | Administrative & support | 2016 |
| IB Holdco Limited | Professional & scientific | 2012 |
| Ibad Ltd | Wholesale & retail | 2025 |
| Ibisognosi Limited | Health & social care | 2017 |
| Ibpsa-England CIC | Professional & scientific | 2020 |
| Ibstock Funeral Service Limited | Extraterritorial | 2018 |
| Icebox Limited | Extraterritorial | 2006 |
| Idicula IT Ltd | Information & communication | 2023 |