| Hi-Tech Roofing Innovations Ltd | Construction | 2025 |
| HIC Smart Limited | Manufacturing | 2024 |
| Hidalgo Limited | Information & communication | 1997 |
| Hidden Depths Productions Ltd | Information & communication | 2015 |
| Hien's Salon Ltd | Other services | 2024 |
| Hiflite Ltd | Other services | 2022 |
| High Land Intl Trading Ltd | Wholesale & retail | 2019 |
| High Precision (Cambridge) Limited | Professional & scientific | 2011 |
| High Source Industrial Co., Ltd. | Extraterritorial | 2024 |
| High Street (Meldreth) LLP | | 2019 |
| High Street Chesterton Ltd | Construction | 2019 |
| High Windows Holdings Ltd | Financial services | 2025 |
| Highbeam Strategic Services Limited | Professional & scientific | 2013 |
| Higher Being Ltd | Arts & recreation | 2007 |
| Higher Order Limited | Professional & scientific | 2021 |
| Higher Reputation Limited | Information & communication | 2024 |
| Highfield Event Group Ltd | Administrative & support | 2007 |
| Highfield Group Holdings Ltd | Real estate | 2017 |
| Highgate Country Stores Ltd. | Wholesale & retail | 2010 |
| Highgate Veterinary Clinic Limited | Professional & scientific | 2023 |
| Highgrove Close Park Limited | Hospitality | 2019 |
| Highland COW Cottage Land Ltd | Financial services | 2025 |
| Highland COW Cottage Limited | Agriculture & fishing | 2023 |
| Highland Law Ltd. | Other services | 2023 |
| Highland Light Ventures Limited | Manufacturing | 2024 |
| Highlands Haulage Ltd | Transport & logistics | 2021 |
| Highly Strung Limited | Financial services | 1995 |
| Highpoint Aviation Ltd | Manufacturing | 2026 |
| Highpoint Community Repeaters Limited | Administrative & support | 1981 |
| Highpoint Radio Communications Limited | Other services | 1976 |
| Highroute Ltd | Transport & logistics | 2023 |
| Highthorpe Investments Limited | Real estate | 1962 |
| Highworth House Limited | Real estate | 2013 |
| Hignal Scientech Group Ltd | Manufacturing | 2017 |
| Higreat Marine Supply Co., Ltd | Wholesale & retail | 2024 |
| Hikayati Publishers Limited | Information & communication | 2020 |
| Hilarity Theatre Group Limited | Arts & recreation | 2024 |
| Hilary Murdoch Advisory Ltd | Professional & scientific | 2026 |
| Hilary's Wholesale Limited | Wholesale & retail | 2000 |
| Hill Composites Ltd | Manufacturing | 2022 |
| Hill Farm (Castle Camps) Limited | Agriculture & fishing | 1965 |
| Hill Farm Dullingham LLP | | 2015 |
| Hill Farm Holdings Company (Cambridge) Limited | Financial services | 2023 |
| Hill Homes & Services Ltd | Construction | 2023 |
| Hillian Ltd | Wholesale & retail | 2025 |
| Hillmead Technology Limited | Professional & scientific | 2015 |
| Hills Capital Limited | Real estate | 2021 |
| Hills Education Trust Limited | Education | 2022 |
| Hills Road (Cambridge) LLP | | 2019 |
| Hills Road Associates Limited | Professional & scientific | 2018 |
| Hillside Mill (Swaffham Bulbeck) Management Company Limited | Households | 2022 |
| Hillsroad Clinic Ltd. | Other services | 2013 |
| Hillswood Management Limited | Construction | 1998 |
| Hilltop Lane Management Company Limited | Households | 1989 |
| Hilo EV Limited | Manufacturing | 2020 |
| Hiluke Trade Co., Ltd | Wholesale & retail | 2022 |
| Himore (UK) Holding Co., Ltd | Wholesale & retail | 2025 |
| Hinchley Medical Ltd | Health & social care | 2022 |
| Hindmarsh Rees Limited | Health & social care | 2013 |
| Hine Composites Ltd | Manufacturing | 2023 |
| Hinkins Land & Development Ltd | Construction | 2026 |
| Hinton Seven Limited | Hospitality | 2024 |
| Hiperqb Analytics Ltd | Information & communication | 2022 |
| Hire Calling Limited | Administrative & support | 2024 |
| Hire for Success Ltd | Administrative & support | 2019 |
| Hiris Makes Ltd | Professional & scientific | 2021 |
| Hiroan Shipping Co., Limited | Extraterritorial | 2019 |
| Hiroi Shipping Co., Limited | Extraterritorial | 2016 |
| Hirojun Shipping Co., Limited | Extraterritorial | 2015 |
| Hiromi Shipping Co., Limited | Extraterritorial | 2021 |
| Hiroyou Shipping Co., Limited | Extraterritorial | 2019 |
| Hiso Import and Export Co., Ltd | Wholesale & retail | 2021 |
| Histon and Impington Communications C.I.C. | Information & communication | 2018 |
| Histon Aviation Limited | Transport & logistics | 2007 |
| Histon Chop Shop Ltd | Wholesale & retail | 2012 |
| Histon Football Club Holdings Limited | Real estate | 1962 |
| Histon Football Club Limited | Arts & recreation | 2006 |
| Histon Green Management Limited | Households | 1993 |
| Histon Homes Ltd | Administrative & support | 2025 |
| Histon Produce Co Limited | Wholesale & retail | 1999 |
| Histon Research LLP | | 2013 |
| Histon Software Ltd | Information & communication | 2020 |
| Histon Station House Ltd | Hospitality | 2021 |
| Histon Station Property Limited | Real estate | 2023 |
| Histon Village Fryer Limited | Hospitality | 2025 |
| Historic Flying Limited | Extraterritorial | 2021 |
| History INK Limited | Arts & recreation | 2021 |
| History Reclaimed | Information & communication | 2022 |
| Historyworks Ltd | Information & communication | 2012 |
| Hiteam Limited | Professional & scientific | 2014 |
| Hitgen UK Ltd | Financial services | 2020 |
| Hiti Ltd | Manufacturing | 2017 |
| Hito UK Travel Limited | Administrative & support | 2025 |
| Hitomics Ltd | Professional & scientific | 2026 |
| Hitrip Limited | Administrative & support | 2015 |
| Hittin Ltd | Wholesale & retail | 2020 |
| Hive Architecture Limited | Professional & scientific | 2021 |
| Hive Build Ltd | Construction | 2020 |
| Hive Consultants Limited | Professional & scientific | 2017 |
| Hive Marketing Services Ltd | Professional & scientific | 2024 |