| Hanifa Tech Ltd | Information & communication | 2023 |
| Hans Corporation Ltd | Other services | 2025 |
| Hans Jacob Bernardus Kruger Limited | Extraterritorial | 2025 |
| Hansee Soft Ltd | Information & communication | 2015 |
| Hansika Consultancy Ltd | Information & communication | 2017 |
| Hanvanth Travel Ltd | Transport & logistics | 2025 |
| Hanys Transport Ltd | Transport & logistics | 2022 |
| Happy and Joy Decors Ltd | Other services | 2022 |
| Happy Maintenance Limited | Construction | 2022 |
| Happy Telecom Limited | Administrative & support | 2022 |
| Happy Trails Play Lightwater Ltd | Health & social care | 2026 |
| Happy Trails Play Ltd | Health & social care | 2023 |
| Harasu Properties Limited | Real estate | 2022 |
| Hard & Sweet Solutions Limited | Manufacturing | 2015 |
| Hard Rock Furniture Ltd | Wholesale & retail | 2017 |
| Hardacres Equine Limited | Transport & logistics | 2025 |
| Hardy Building Contractors Limited | Construction | 2007 |
| Hardy Construction Consultants Limited | Professional & scientific | 2021 |
| Harima Next Generation Ltd | Health & social care | 2019 |
| Hariswar Ltd | Real estate | 2023 |
| Harkness Lait Developments Limited | Construction | 2007 |
| Harley Street Clinic Limited | Health & social care | 2007 |
| Harlyn Services Limited | Wholesale & retail | 2021 |
| Harmony and Home Limited | Real estate | 2025 |
| Harmony at Home Care Services Ltd | Health & social care | 2024 |
| Harnett Agricultural Services Ltd | Agriculture & fishing | 2025 |
| Harper Blue Limited | Professional & scientific | 2017 |
| Harper Security Limited | Administrative & support | 2026 |
| Harpers (Haddenham) Limited | Real estate | 2021 |
| Harpers Estate Agents (Wendover) Limited | Real estate | 2019 |
| Harpers Properties Group Limited | Financial services | 2022 |
| Harpur IT Ltd | Administrative & support | 2023 |
| Harrigen Limited | Construction | 2021 |
| Harrilove Properties Limited | Real estate | 2025 |
| Harris & Hick Limited | Professional & scientific | 2006 |
| Harrison Construction Limited | Construction | 1998 |
| Harrison Jacobs Ltd | Construction | 2019 |
| Harrogate Rowe Ltd | Information & communication | 2025 |
| Harrow Road Sudbury Management Co. Limited | Households | 1991 |
| Harrow Young Musicians | Education | 1997 |
| Harry’S Mots Ltd | Wholesale & retail | 2025 |
| Hart Business Group Ltd | Financial services | 2020 |
| Hartin & LEE Healthcare Ltd | Health & social care | 2021 |
| Hartin & LEE Solutions Ltd | Administrative & support | 2025 |
| Hartley Health Consultancy Ltd | Public administration | 2021 |
| Hartley's Dining Company Ltd | Hospitality | 2021 |
| Harts & Hounds Ltd | Agriculture & fishing | 2019 |
| Hartwell & Thorn Ltd | Hospitality | 2024 |
| Hartwell Riding Stables Ltd | Arts & recreation | 2006 |
| Haruna Psychiatry Services Limited | Health & social care | 2016 |
| Harv-My Properties Ltd | Construction | 2024 |
| Harvey Anaesthesia Services Limited | Health & social care | 2023 |
| Harvey CC Limited | Administrative & support | 2024 |
| Harvey Digital Ltd | Professional & scientific | 2017 |
| Harvey Financial Planning Limited | Professional & scientific | 2025 |
| HAS Bins Limited | Administrative & support | 2014 |
| Haseley Marketing Limited | Professional & scientific | 2006 |
| Haselgrove Accounting Services Limited | Professional & scientific | 2019 |
| Haselhurst Blinds Ltd. | Construction | 2017 |
| Hashtag Diagnostics Ltd | Administrative & support | 2022 |
| Hashtag DX Ltd | Administrative & support | 2022 |
| Hasp Consulting Ltd | Professional & scientific | 2021 |
| Hassan Trade Zone Ltd | Wholesale & retail | 2024 |
| Hassaniandco Ltd | Wholesale & retail | 2023 |
| Hatton Enterprise Solutions Limited | Information & communication | 2018 |
| Hauser Racing Limited | Manufacturing | 2004 |
| Havenwoods (Special Needs) Care Ltd | Health & social care | 2024 |
| Haverhill Contract Packing Limited | Administrative & support | 2024 |
| Havoc Designs Ltd | Professional & scientific | 2016 |
| Havonuk Ltd | Information & communication | 2025 |
| Hawes & Allen Ltd | Construction | 2025 |
| Hawes Buy to LET Ltd | Real estate | 2025 |
| Hawes Group Holdings Ltd | Financial services | 2024 |
| Hawkswell Drilling and Testing Services Ltd | Construction | 2004 |
| Haynat Limited | Construction | 2007 |
| Hayward Radiological Protection Services Limited | Water & waste | 2018 |
| Hayyat Landmark Ltd | Real estate | 2019 |
| Hazard Metrics (UK) Ltd | Financial services | 2013 |
| Hazell Energy Ltd | Professional & scientific | 2015 |
| Hazelwood Estate Management Limited | Administrative & support | 2024 |
| HBS Freight Limited | Transport & logistics | 2021 |
| HC Peking Ltd | Hospitality | 2022 |
| HCC Transport Ltd | Transport & logistics | 2026 |
| HCW Recoveries Limited | Professional & scientific | 2016 |
| HD Windows Aylesbury Ltd | Construction | 2023 |
| Hdem Ltd | Health & social care | 2025 |
| Hdla Ltd | Real estate | 2025 |
| Head Honcho Barbershop Limited | Other services | 2018 |
| Headiesbyjuliana Limited | Wholesale & retail | 2026 |
| Headline ACT Ltd | Professional & scientific | 2025 |
| Heads UP Hands on Limited | Professional & scientific | 2004 |
| Headstart Dynamic Limited | Information & communication | 2015 |
| Headway Marine Fuels Limited | Administrative & support | 2017 |
| Health Awareness Limited | Other services | 2003 |
| Health First 24-7 Ltd | Transport & logistics | 2017 |
| Healthcare Engineering Services Limited | Professional & scientific | 2017 |
| Healthear Solutions Limited | Health & social care | 2025 |
| Healthsync Business Consultants & Investment Group Ltd | Professional & scientific | 2023 |
| Healthy Horse Physiotherapy Limited | Professional & scientific | 2019 |
| Healthy Minds for Development CIC | Health & social care | 2024 |