| Hanbuilt Limited | Other services | 2022 |
| Hanna's Creations Ltd | Wholesale & retail | 2023 |
| Happy Audience Limited | Information & communication | 2006 |
| Happy Bunnies Limited | Extraterritorial | 2000 |
| Happy Pets Veterinary Practice Limited | Professional & scientific | 2010 |
| Haran Business Consultancy Limited | Professional & scientific | 2025 |
| Harbrooke Sports & Classic Ltd | Wholesale & retail | 2026 |
| Harcharran Limited | Wholesale & retail | 2025 |
| Hardie Secure Products Limited | Manufacturing | 2002 |
| Harlequin Services Ltd | Construction | 2016 |
| Harlestone Supplies Limited | Wholesale & retail | 2022 |
| Harper Rose Ltd | Wholesale & retail | 2024 |
| Harpmans Limited | Professional & scientific | 1996 |
| Hartmann & Benz Group Ltd | Wholesale & retail | 2021 |
| Harvee Logistics Ltd | Transport & logistics | 2025 |
| Harwood Financial Ltd | Extraterritorial | 2006 |
| Hasnat Chauffeur Service Limited | Transport & logistics | 2026 |
| Hayling Avenue Flats (Little Paxton) Limited | Real estate | 1976 |
| HC Member Limited | Financial services | 2024 |
| HD Paints Ltd | Wholesale & retail | 2022 |
| HD Planning Ltd | Administrative & support | 2013 |
| Headleys Lane Witcham Ltd | Real estate | 2018 |
| Heal Surfacing Solutions Limited | Construction | 2026 |
| Healey's Stoves Ltd | Construction | 2021 |
| Health & Safety Solutions Limited | Administrative & support | 1997 |
| Health Lightness Ltd | Extraterritorial | 2023 |
| Healthcare Interaction Limited | Information & communication | 1999 |
| Heart in Mind Ltd | Other services | 2021 |
| Heatingsave Ltd | Professional & scientific | 2008 |
| Helical Pile Solutions Ltd | Manufacturing | 2021 |
| Helm Labs Ltd | Public administration | 2025 |
| Helpy Domestic Cleaning Ltd | Wholesale & retail | 2015 |
| Hely-Shop UK Limited | Wholesale & retail | 2017 |
| Hemisphere Trading Ltd | Wholesale & retail | 2025 |
| HEN Brook Mill Limited | Households | 2017 |
| Hengeveld Software Engineering Ltd | Information & communication | 2007 |
| Heritage Repointing and Restoration Ltd | Construction | 2022 |
| Hertford Developments Limited | Construction | 2005 |
| HIA People Ltd | Administrative & support | 2019 |
| Hibernian Private Client Property Limited | Real estate | 2022 |
| Hiddenleaf Ltd | Administrative & support | 2025 |
| Highest Ground Limited | Professional & scientific | 2018 |
| Highland Homes and Gardens Ltd | Construction | 2018 |
| HIJK20 Ltd | Administrative & support | 2016 |
| Hilsdon Associates Ltd | Professional & scientific | 2025 |
| Hinton Lodge (ST Neots) Management Company Limited | Households | 1988 |
| Hire OR Buy Group Limited | Administrative & support | 1978 |
| Historic Racing Limited | Administrative & support | 1988 |
| HJM Estates Ltd | Real estate | 2025 |
| HKD Properties Limited | Real estate | 2025 |
| HMD Cars Ltd | Wholesale & retail | 2024 |
| Hobby Books Ltd | Wholesale & retail | 2021 |
| Hocb (Group) Limited | Financial services | 2020 |
| Hocb (Retail) Limited | Wholesale & retail | 2020 |
| Hogsden Consultants Limited | Information & communication | 2020 |
| Home of Eco Limited | Administrative & support | 2016 |
| Honeybee-Experiences Limited | Education | 2025 |
| Honeycomb Photography & Framing Ltd | Manufacturing | 2002 |
| Horizon Tower Crane Services (ST. Neots) Ltd | Manufacturing | 2014 |
| Horizonte Tech Limited | Information & communication | 2024 |
| Hotas Ltd | Administrative & support | 2018 |
| Hotel Interior Ltd | Administrative & support | 2020 |
| Hotelkonzept Interior AG Ltd | Administrative & support | 2020 |
| Hotspot Pizza Takeaway Limited | Hospitality | 2017 |
| Howkins Associates Ltd | Professional & scientific | 2016 |
| Howsman Ltd | Administrative & support | 2003 |
| HP Trans Ltd | Transport & logistics | 2025 |
| HPS Property Holdings Ltd | Real estate | 2025 |
| HR Whisperer Ltd | Administrative & support | 2025 |
| Hranice Ltd | Administrative & support | 2022 |
| Htmc Ltd | Real estate | 2018 |
| Hughes Rimmer LLP | | 2025 |
| Hugo App Ltd | Information & communication | 2026 |
| Huntes Cleaning Services Limited | Administrative & support | 2024 |
| Huntingdon Digital Limited | Information & communication | 2018 |
| Hunts Limited | Agriculture & fishing | 1997 |
| Hygiene Services (JAT) Ltd. | Other services | 2008 |
| I4 Automation Holdings Ltd | Financial services | 2024 |
| I4 Automation Ltd | Wholesale & retail | 2009 |
| Iaim (UK) Community Interest Company | Other services | 2009 |
| Ibandalex Limited | Construction | 2018 |
| Icarus Group Ltd | Wholesale & retail | 2018 |
| ID Monkey Limited | Administrative & support | 2012 |
| Idash Group Limited | Financial services | 2021 |
| Idash Software Limited | Information & communication | 2021 |
| Idash Solutions Limited | Information & communication | 2001 |
| Igel Contracting Ltd | Other services | 2024 |
| Ilumonation Electrical Ltd | Construction | 2026 |
| Image Creation Supplies Limited | Professional & scientific | 2021 |
| Immone Ltd | Extraterritorial | 2021 |
| Improper Records Ltd | Information & communication | 2026 |
| IN Confidence Limited | Professional & scientific | 2009 |
| Inboundesk Ltd | Information & communication | 2026 |
| Include Fitness Limited | Arts & recreation | 2020 |
| Incore Imports Ltd | Wholesale & retail | 2026 |
| Independent Inspection Services Limited | Professional & scientific | 2003 |
| Index Pack Limited | Manufacturing | 2013 |
| Indira Walker Consulting Limited | Professional & scientific | 2007 |
| Industrial Compliance Ltd | Administrative & support | 2007 |
| Indyseer UK Limited | Information & communication | 2023 |