| Harper & ME Ltd | Wholesale & retail | 2021 |
| Harper's Consulting Ltd | Administrative & support | 2024 |
| Harpermc Ltd | Information & communication | 2019 |
| Harrison Holmes Funfairs Ltd | Arts & recreation | 2025 |
| Harrold Green Fish Bar Limited | Hospitality | 2013 |
| Harry George Developments Ltd | Real estate | 2020 |
| Hashly Co Limited | Wholesale & retail | 2023 |
| Hatari Global Solutions Ltd | Professional & scientific | 2018 |
| Haumart Cleaning/Hygeine Services Ltd | Administrative & support | 2023 |
| Haunted Mansion Ltd | Arts & recreation | 2023 |
| Haupa Associates Limited | Administrative & support | 2013 |
| Hauspoint Ltd | Real estate | 2025 |
| Haussmann O'Neill Limited | Financial services | 2013 |
| Haxed Limited | Hospitality | 2021 |
| HB Fire Ltd | Public administration | 2025 |
| HB Fire Protection Ltd | Public administration | 2025 |
| Headcheese Limited | Real estate | 2023 |
| Heartsease Consulting Limited | Information & communication | 2018 |
| Heathrow Sales Limited | Wholesale & retail | 2023 |
| Heighten Hub Ltd | Health & social care | 2025 |
| Helen Redding Education Consultancy Limited | Professional & scientific | 2017 |
| Hendrix Auto Rentals Ltd | Administrative & support | 2026 |
| Hendrix Barber Co Ltd | Other services | 2018 |
| Henrymichael Consultancy Limited | Wholesale & retail | 2013 |
| Herbie's Haulage Limited | Transport & logistics | 2008 |
| Heritage Bespoke Furniture Limited | Manufacturing | 2023 |
| Heritage GAS Turbines Ltd | Manufacturing | 2018 |
| Heritage Roofing (Stamford) Ltd | Construction | 2020 |
| Heritage Tattoo Collective Ltd | Arts & recreation | 2025 |
| Hets Pro Ltd | Construction | 2025 |
| Hexagon Business Management LLP | | 2015 |
| HGV School of Transport Limited | Education | 2016 |
| Hi-Class Machinery Group Limited | Wholesale & retail | 1992 |
| Hi-Class Machinery Limited | Wholesale & retail | 2006 |
| Hideaway Properties Ltd | Real estate | 2023 |
| High Beech Management Company Limited | Households | 2024 |
| High Street Courtyard Management Company Limited | Real estate | 2012 |
| Higham and Rushden Judo Club Ltd | Education | 2021 |
| Higham Carers Ltd | Health & social care | 2022 |
| Higham Ferrers Environmental Ltd | Water & waste | 2020 |
| Higham Fish Bar Ltd | Hospitality | 2025 |
| Higham Mortgages Limited | Financial services | 2025 |
| Higham Park Incentives Advisers Limited | Professional & scientific | 2020 |
| Higham Park Solar Ltd | Professional & scientific | 2023 |
| Higham Roofing & Construction Ltd | Financial services | 2020 |
| Higham Roofing Limited | Financial services | 2011 |
| Higham Systems Compliance Limited | Administrative & support | 2012 |
| Highboys Consulting Limited | Professional & scientific | 2023 |
| Highbuild Group Ltd | Construction | 2019 |
| Hike Train Move Limited | Arts & recreation | 2024 |
| Hire Smart Ltd | Administrative & support | 2024 |
| Hive Martial Arts Ltd | Arts & recreation | 2023 |
| HLK Consultancy Ltd | Professional & scientific | 2024 |
| HLP Group Limited | Financial services | 2024 |
| HM Property Ltd | Real estate | 2025 |
| Hockney Hayes Solutions Limited | Administrative & support | 2023 |
| Hogarth Engineering Ltd | Manufacturing | 2003 |
| Holdcroft Aviation Services Limited | Other services | 1976 |
| Holistic Treatments Ltd | Other services | 2024 |
| Holland Hazeldore Properties Ltd | Real estate | 2025 |
| Hollymoor Village Property Company Limited | Real estate | 1999 |
| Home Legal Protection Ltd | Financial services | 2024 |
| Home Outlet (Market Harborough) Limited | Wholesale & retail | 2012 |
| Home Outlet Direct Limited | Wholesale & retail | 2014 |
| Home Outlet Group Limited | Financial services | 2017 |
| Home Outlet Limited | Extraterritorial | 2022 |
| Homecare Cleaning Services Limited | Administrative & support | 2002 |
| Homeefe Ltd | Construction | 2020 |
| Homegrown Care Farm CIC | Agriculture & fishing | 2017 |
| Honeywood Comms Electrical Services Ltd | Construction | 2025 |
| Hong Kong BUS Association CIC | Transport & logistics | 2020 |
| Hoofs-Uk Ltd | Other services | 2024 |
| Hooton Holdings Ltd | Real estate | 2018 |
| Horwood Palm Limited | Wholesale & retail | 2016 |
| House of Venom Reptiles Limited | Wholesale & retail | 2016 |
| HRB Educational Consultancy Limited | Education | 2014 |
| HSZ Consulting Ltd | Professional & scientific | 2009 |
| Humanware Europe Ltd | Manufacturing | 1992 |
| Humphriss Law Limited | Professional & scientific | 2025 |
| Hundred Acre (GB) Limited | Other services | 2008 |
| Hundred Acre Safety Limited | Extraterritorial | 2013 |
| Hungry Horris and Sons Ltd | Hospitality | 2025 |
| Hunt Services Limited | Construction | 2015 |
| Huntco Ltd | Financial services | 2025 |
| Huntingdon Town Football Club Boys & Girls Ltd | Arts & recreation | 2025 |
| Huntingdon Town Football Club Ltd | Other services | 2017 |
| Hutton of Northampton Ltd | Wholesale & retail | 2008 |
| Hyde and Perk Limited | Wholesale & retail | 2019 |
| Hyperion Safety Ltd | Administrative & support | 2022 |
| Hyphr Limited | Information & communication | 2023 |
| IAN Paul Ltd | Financial services | 2014 |
| IC Building & Services Ltd | Construction | 2020 |
| ICL Civils Limited | Construction | 2026 |
| Identity Media Productions Ltd | Information & communication | 2018 |
| Idlec Ltd | Construction | 2020 |
| Ihple Limited | Professional & scientific | 2016 |
| Ikaros Construction Ltd | Construction | 2021 |
| IKE Investment Property Limited | Real estate | 2026 |
| IKE Motors Limited | Wholesale & retail | 2016 |
| ILG Property Investments Ltd | Real estate | 2022 |