| Honlow Ltd | Wholesale & retail | 2026 |
| Hope Sweet Creations Ltd | Wholesale & retail | 2022 |
| Hopstop Donuts Limited | Hospitality | 2025 |
| Horace Bull Ltd | Professional & scientific | 2016 |
| Horace Dale Ltd | Extraterritorial | 2024 |
| Horitech Ltd | Information & communication | 2023 |
| Horizon House Cambourne Limited | Construction | 2016 |
| Horizons Education Trust | Education | 2015 |
| Hornett Audio Visual Ltd | Construction | 2018 |
| Hospitality Care UK Limited | Health & social care | 2025 |
| Host Bars Limited | Hospitality | 2025 |
| Hot Key Software Limited | Information & communication | 1993 |
| Houghton Hall Equestrian and Alpaca Centre Limited | Agriculture & fishing | 2012 |
| Houghton Hill House Consultants Limited | Administrative & support | 1997 |
| Houghton Horse Transport Limited | Professional & scientific | 2023 |
| Houghton Plumbing and Heating Ltd | Construction | 2022 |
| House of Numeri Ltd | Professional & scientific | 2025 |
| Howard Developments Cambs Limited | Real estate | 2019 |
| Howard Lamin Limited | Real estate | 1954 |
| Howard Renovations Limited | Construction | 2018 |
| Howell Software Limited | Information & communication | 2016 |
| Howes Hose & Hydraulics Ltd | Manufacturing | 2025 |
| HP Investment Holdings Limited | Real estate | 2017 |
| HP2G Ltd | Construction | 2008 |
| HR Lettings Limited | Real estate | 2008 |
| HRP Medical Limited | Health & social care | 2023 |
| Hsnr Ltd | Wholesale & retail | 2020 |
| HTH Property Ltd | Real estate | 2024 |
| Huff Media Ltd | Information & communication | 2011 |
| Hunt Dent Ltd | Health & social care | 2025 |
| HUNT2RIDE Limited | Transport & logistics | 2024 |
| Huntingdon Autos Ltd | Wholesale & retail | 2017 |
| Huntingdon Boiler Services Limited | Construction | 2021 |
| Huntingdon Carnival Limited | Administrative & support | 2015 |
| Huntingdon Cars Taxis Ltd | Transport & logistics | 2019 |
| Huntingdon Community Radio (Media) Limited | Information & communication | 2008 |
| Huntingdon Community Radio Limited | Information & communication | 1996 |
| Huntingdon Couriers Ltd | Transport & logistics | 2014 |
| Huntingdon Dental Ltd | Health & social care | 2013 |
| Huntingdon Foodbank Ltd | Hospitality | 2023 |
| Huntingdon Furniture Warehouse Limited | Wholesale & retail | 2014 |
| Huntingdon Gymnastics Club Limited | Arts & recreation | 2008 |
| Huntingdon IT Ltd | Other services | 2020 |
| Huntingdon Masonic Hall,Limited | Other services | 1934 |
| Huntingdon Mencap Society Limited | Health & social care | 2003 |
| Huntingdon Osteopathic Practice Limited | Health & social care | 2004 |
| Huntingdon Plant Hire Limited | Construction | 1986 |
| Huntingdon Pool and Snooker Ltd | Arts & recreation | 2019 |
| Huntingdon Roofing Company Ltd | Construction | 2025 |
| Huntingdon Santa CIC | Arts & recreation | 2025 |
| Huntingdon Tyres Ltd | Wholesale & retail | 2025 |
| Huntingdon Van Hire Ltd | Administrative & support | 2018 |
| Huntingdon Windows & Building Plastics Ltd | Wholesale & retail | 2024 |
| Huntingdon, Peterborough and Cambridge MS Therapy Centre Ltd | Health & social care | 1988 |
| Huntingdonshire Swim Academy Ltd | Education | 2026 |
| Huntingdonshire Volunteer Centre | Other services | 2008 |
| Huntingdonshire.Biz Limited | Administrative & support | 2004 |
| Hunts Building and Landscapes Ltd | Administrative & support | 2025 |
| Hunts County Bats Limited | Manufacturing | 1983 |
| Hunts Real Estate Ltd | Real estate | 2026 |
| Hunts Recycling Limited | Water & waste | 2017 |
| Hunts Spice Ltd | Hospitality | 2025 |
| Hunts Technology Consultant Ltd | Information & communication | 2026 |
| Huntsbridge Vets Ltd | Professional & scientific | 2025 |
| Hutchins Homes Ltd | Real estate | 2026 |
| Hutley Homes Limited | Real estate | 2023 |
| HXT Gloves (Europe) Ltd | Professional & scientific | 2024 |
| Hydrophis UK Ltd | Professional & scientific | 2019 |
| I L R Maintenance Services Ltd | Construction | 2022 |
| I Lash Ltd | Wholesale & retail | 2024 |
| I M Rick Ltd | Professional & scientific | 2022 |
| I&B Lettings Limited | Real estate | 2025 |
| I.C. and P. Wipers Limited | Wholesale & retail | 1972 |
| I.C.G. Securities Limited | Real estate | 1999 |
| I4IMPACT Ltd | Professional & scientific | 2024 |
| I4LETS Limited | Real estate | 2018 |
| I4TECH Innovations Limited | Wholesale & retail | 2022 |
| IAG Limited | Professional & scientific | 1997 |
| IAN Hopwell Limited | Public administration | 2009 |
| IAN Talton Business Solutions Limited | Professional & scientific | 2017 |
| Ian's MOT Centre Limited | Wholesale & retail | 2024 |
| Iasm Enterprises Limited | Wholesale & retail | 2014 |
| Ibasho Consulting Ltd | Professional & scientific | 2026 |
| IC7 Design Ltd | Construction | 2021 |
| Icelandic UK Limited | Extraterritorial | 1996 |
| ICR Global Limited | Financial services | 2023 |
| ID & GC Howard Limited | Agriculture & fishing | 2006 |
| ID Sawtry Ltd | Hospitality | 2025 |
| ID-7 Ltd | Extraterritorial | 2025 |
| Ideal CRM Solutions Ltd | Administrative & support | 2020 |
| Ideal Field Management Solutions Ltd | Administrative & support | 2020 |
| Ideal Trainers Limited | Education | 2004 |
| Idesign & Develop Limited | Construction | 2014 |
| Idrivepro Limited | Wholesale & retail | 2024 |
| Iergo Limited | Information & communication | 2005 |
| IFA Client Sales (UK) Ltd | Professional & scientific | 2013 |
| Ifabs Building Services Ltd | Construction | 2019 |
| Ifdigital Ltd | Professional & scientific | 2020 |
| Igalaxy Ltd | Information & communication | 2024 |
| IGK 72 Ltd | Wholesale & retail | 2022 |