| Henry H Bletsoe and SON LLP | | 2012 |
| Henry T.Billson (Kettering) Limited | Manufacturing | 1970 |
| Herbal Horse and Pet Limited | Wholesale & retail | 2024 |
| Herculian Training Hall Ltd | Education | 2026 |
| Here After Limited | Wholesale & retail | 2014 |
| Heritage Build Group Ltd | Construction | 2023 |
| Heritage Foundry Limited | Wholesale & retail | 2019 |
| Hernik Homes Ltd | Real estate | 2024 |
| Heros Construction Ltd | Construction | 2018 |
| Hertz Compressors UK Limited | Manufacturing | 2025 |
| Hexia Software Limited | Information & communication | 2014 |
| Heyansh Ltd | Extraterritorial | 2025 |
| HG Clinical Coding Limited | Administrative & support | 2013 |
| HGV EU Ltd | Professional & scientific | 2015 |
| HH Advisory Services Limited | Professional & scientific | 2024 |
| Hi&Ug Ltd | Hospitality | 2025 |
| HI13 Ltd | Wholesale & retail | 2026 |
| Hibiscus Carpets Ltd | Wholesale & retail | 2014 |
| Hickling Online Sales Ltd | Wholesale & retail | 2024 |
| Hidden Masters Ltd | Wholesale & retail | 2013 |
| High Flame Building Services Limited | Construction | 2026 |
| High Northgate Development Ltd | Construction | 2026 |
| High Voltage Systems and Services Limited | Construction | 2010 |
| Higham Ferrers Ltd | Hospitality | 2024 |
| Highcross Autoservices Limited | Wholesale & retail | 2002 |
| Highfield Construction Thrapston Limited | Administrative & support | 2015 |
| Highfield Road Offlicence Ltd | Wholesale & retail | 2015 |
| Highland Property Services Limited | Real estate | 1984 |
| Highview Court Residents Association Limited | Real estate | 1970 |
| Hijama and Holistic Therapies Ltd | Health & social care | 2025 |
| Hill Asset Holdings Limited | Real estate | 2016 |
| Hill Family Limited | Professional & scientific | 2022 |
| Hill Family Office Limited | Real estate | 2014 |
| Hillbrook Construction Limited | Professional & scientific | 2023 |
| Hillcross International CIC | Administrative & support | 2026 |
| Hillerberg Solutions Ltd | Information & communication | 2026 |
| Hillery Electrical Ltd. | Construction | 2025 |
| Hillfarm Motor Engineers Ltd | Manufacturing | 2014 |
| Hillrise Partnership Limited | Professional & scientific | 2018 |
| Hilly Horton Home Limited | Wholesale & retail | 2020 |
| Hillyer Consultants Ltd | Professional & scientific | 2021 |
| Hilson Holdings Ltd | Arts & recreation | 2025 |
| Hilton Pharmacy Limited | Wholesale & retail | 1996 |
| Hilton Tech Ltd | Professional & scientific | 2024 |
| Hind Brothers Limited | Agriculture & fishing | 1954 |
| Hingerose Limited | Wholesale & retail | 1979 |
| Hispec Contracts LLP | | 2003 |
| Hispec Properties LLP | | 2003 |
| Histays Ltd | Real estate | 2024 |
| Historic Equitation Ltd | Arts & recreation | 2011 |
| HIT My Heart Songs Ltd | Arts & recreation | 2017 |
| Hits - Health Improvement Transformation Strategies C.I.C. | Health & social care | 2021 |
| Hives Associates Limited | Real estate | 1995 |
| HKS Sales & Lettings Ltd | Real estate | 2024 |
| HM Custom Packaging Ltd | Wholesale & retail | 2025 |
| HMH Management Service Ltd | Real estate | 2024 |
| Hmrs Networks Ltd | Information & communication | 2024 |
| HN Electrical Ltd | Construction | 2021 |
| HNR Express Solutions Ltd | Manufacturing | 2025 |
| HNS Forecourts Ltd | Wholesale & retail | 2018 |
| Hockridge Financial Services Ltd | Professional & scientific | 2024 |
| Hockridge Mortgages Holdings Limited | Financial services | 2024 |
| Hodgson Property Ltd | Real estate | 2020 |
| Hoecker Ltd | Extraterritorial | 2009 |
| Hoecker Structures Ltd | Extraterritorial | 2009 |
| Hoecker Structures UK Limited | Wholesale & retail | 1990 |
| Hoecker UK Ltd | Extraterritorial | 2009 |
| Hofmeyr Services (UK) Limited | Professional & scientific | 2014 |
| HOG Properties Limited | Professional & scientific | 2018 |
| Hollabee Ltd | Wholesale & retail | 2024 |
| Hollington Medical Ltd | Manufacturing | 2019 |
| Holmely Ltd | Real estate | 2026 |
| Holmere Developments Limited | Households | 1984 |
| Holywell Limited | Real estate | 2021 |
| Home Farm Pytchley Limited | Agriculture & fishing | 2002 |
| Home Furniture Centre Limited | Manufacturing | 2014 |
| Home Garden Ornaments Ltd | Wholesale & retail | 2020 |
| Home of Vapers Limited | Wholesale & retail | 2019 |
| Home Realty Limited | Real estate | 2020 |
| Home Sensations Limited | Other services | 2007 |
| Home Style Improvements Limited | Construction | 2002 |
| Home-Start Kettering Area | Health & social care | 2006 |
| Homebrite Cleaning Limited | Administrative & support | 2010 |
| Homecrest Consultancy Limited | Professional & scientific | 2026 |
| Homecrest Group Limited | Financial services | 2026 |
| Homecrest Homes Limited | Real estate | 2026 |
| Homefield Grange Retreat Limited | Other services | 2007 |
| Homehub Properties Ltd | Real estate | 2024 |
| Homely Financial Services Ltd | Financial services | 2018 |
| Homely Hearths Limited | Real estate | 2022 |
| Homepoint Healthcare Services Private Limited | Health & social care | 2015 |
| Homesale Estate Agents Limited | Real estate | 2023 |
| Homesecure 24HR Limited | Construction | 2012 |
| Homesurv Limited | Administrative & support | 2003 |
| Hometrust Properties Ltd | Real estate | 2026 |
| Honeybean Café Ltd | Hospitality | 2024 |
| Honour Property Management Ltd | Real estate | 2026 |
| Hooton Homeware Ltd | Wholesale & retail | 2022 |
| Hooton Property Limited | Real estate | 2020 |
| Hope UK | Education | 1995 |