| Harlaxton Management Solutions Ltd | Administrative & support | 2012 |
| Harlaxton Plant Hire Limited | Administrative & support | 2015 |
| Harmonic Healthcare Consulting Ltd | Health & social care | 2023 |
| Harmor Limited | Manufacturing | 2010 |
| Harnan Ventures Ltd | Professional & scientific | 2025 |
| Harnfield Properties Limited | Mining & quarrying | 1999 |
| Harrijess Ltd | Professional & scientific | 2016 |
| Harrington 1963 Limited | Extraterritorial | 2014 |
| Harrison Ripley Design & Build Limited | Construction | 2026 |
| Harrogates FM Ltd | Administrative & support | 2023 |
| Harrow Resources Ltd | Other services | 2020 |
| Harrowby Roofing Ltd | Construction | 2024 |
| Hartington Wills (HS) Limited | Construction | 2019 |
| Hartland Design Limited | Professional & scientific | 2017 |
| Harwood Timber Solutions Limited | Construction | 2022 |
| Hastish Ltd | Wholesale & retail | 2021 |
| Hategan Ltd | Transport & logistics | 2026 |
| Haughton Castle LLP | | 2009 |
| Haven Capital Holdings Limited | Financial services | 2016 |
| Haven Capital Limited | Financial services | 2009 |
| Haven Consultancy International Limited | Professional & scientific | 2023 |
| Haven Properties Grantham Ltd | Real estate | 2023 |
| Hawke Estates Ltd | Construction | 2012 |
| Hawke Property & Construction Limited | Construction | 2018 |
| Hawkin Loads Limited | Manufacturing | 2025 |
| Hayward's Property Services Ltd | Construction | 2023 |
| Hazelwynd Properties Limited | Real estate | 2025 |
| HB Creative Solutions Limited | Professional & scientific | 2024 |
| HBM Contracting Limited | Real estate | 2017 |
| Hbpm Property Management Limited | Financial services | 2023 |
| Hbps Property Solutions Limited | Administrative & support | 2021 |
| HCM Capital Ltd | Financial services | 2022 |
| Hcps (Lincs) Limited | Construction | 2011 |
| Head Ahead Ltd | Information & communication | 2012 |
| Health Solutions MH Limited | Health & social care | 2025 |
| Healthy Habits Coach Ltd | Health & social care | 2018 |
| Healthy Living People Ltd | Other services | 2020 |
| Heartbeat Medical Services Ltd | Health & social care | 2016 |
| Hearth and Heritage Limited | Wholesale & retail | 2016 |
| Heathfield Underwriting LLP | | 2007 |
| Hector Underwriting LLP | | 2009 |
| Helen Garratt Limited | Real estate | 2015 |
| Helium Media Ltd | Information & communication | 2016 |
| Helmsgate Limited | Financial services | 2023 |
| Hemsley Gardening Limited | Administrative & support | 2010 |
| Henderson Stewart Limited | Professional & scientific | 2024 |
| Henderson Underwriting Limited | Financial services | 2004 |
| Henley Associates Limited | Professional & scientific | 2008 |
| Henry Bell Holdings Limited | Real estate | 2010 |
| Heppleston Ltd | Administrative & support | 2016 |
| Herigerbi Park Ltd. | Hospitality | 2023 |
| Herinziux Ltd | Wholesale & retail | 2021 |
| Heritage Court (Navenby) Management Company Limited | Real estate | 1988 |
| Heronspool LLP | | 2020 |
| Hevin Store Limited | Wholesale & retail | 2025 |
| Heydour Farm Stud Limited | Agriculture & fishing | 2020 |
| HG Property Developments Ltd | Hospitality | 2026 |
| Hibbert Hire Ltd | Administrative & support | 2024 |
| Hideaway Properties 2 Limited | Professional & scientific | 2002 |
| Hier Applications Limited | Information & communication | 2026 |
| High Dyke Properties Ltd | Real estate | 2025 |
| High Premium Group Limited | Other services | 2017 |
| Highleigh Nameco Limited | Financial services | 2025 |
| Highthorne Barn Management Company Limited | Real estate | 2015 |
| Highways Resurfacing Limited | Construction | 2024 |
| Hiker Global Ltd | Extraterritorial | 2004 |
| Hilary Morgan Limited | Wholesale & retail | 2007 |
| Hill Top Equine Limited | Agriculture & fishing | 2026 |
| Hills Poly-Print Ltd | Manufacturing | 1975 |
| Hillwood Limited | Real estate | 1980 |
| Hilton Bailey Childrens Physio Limited | Health & social care | 2013 |
| Hinch Enterprises Limited | Agriculture & fishing | 2007 |
| Hindmarch Properties Limited | Real estate | 1901 |
| Hirst Underwriting Limited | Financial services | 2009 |
| Hitchhiker Global Ltd | Professional & scientific | 2004 |
| Hitchiker Global Ltd | Extraterritorial | 2004 |
| HKR Electrical Ltd | Construction | 2025 |
| Hmfrijs Limited | Wholesale & retail | 2024 |
| HMJ Residential Ltd | Construction | 2021 |
| Hmrg Automotive Ltd | Wholesale & retail | 2026 |
| Hmrg Properties Ltd | Real estate | 2024 |
| Holdings MJ Investment Limited | Financial services | 2022 |
| Holland Electrical Contractors Limited | Construction | 2016 |
| Holland Kitchens & Cabinetmakers Ltd | Manufacturing | 2024 |
| Hollingsworth Building and Property Services Limited | Construction | 2007 |
| Hollingworth Developments (Lincoln) Limited | Construction | 2018 |
| Holltech Consultants Limited | Professional & scientific | 2016 |
| Holly Woodhead Equestrian Limited | Arts & recreation | 2025 |
| Holywell Estate Limited | Real estate | 1988 |
| Honorluna Ltd | Administrative & support | 2020 |
| Hooked on Hoopers Ltd | Education | 2020 |
| Hoppers Jewellers Limited | Wholesale & retail | 1983 |
| Horatio Debt Purchase Limited | Extraterritorial | 2026 |
| Horizon Strategique Limited | Professional & scientific | 2024 |
| Horizons Agriculture Limited | Wholesale & retail | 2000 |
| Horizons Therapy Limited | Health & social care | 2022 |
| Hornbeam Mercantile Limited | Wholesale & retail | 2013 |
| HOS Catering Ltd | Hospitality | 2019 |
| Hoskins & Hoskins Ltd | Real estate | 2026 |
| Hospitality First Ltd | Administrative & support | 2011 |