| Hair Whispers Limited | Other services | 2025 |
| Hairbycaitland Limited | Other services | 2023 |
| Hairbykjr Limited | Other services | 2023 |
| Hairstylesbyicee Limited | Other services | 2022 |
| Haisheng Foreign Trade Co., Ltd | Wholesale & retail | 2025 |
| Haisun Trade Ltd | Wholesale & retail | 2024 |
| Haiyong Machinery Co., Ltd | Manufacturing | 2023 |
| HAJ Limited | Construction | 2021 |
| Halatte Gardens Residents Company Limited | Households | 2005 |
| Halawa WAX Limited | Wholesale & retail | 2025 |
| Halberick Limited | Extraterritorial | 2011 |
| Halcien Ltd | Information & communication | 2012 |
| Hale Bopp Limited | Information & communication | 2024 |
| Haleems Ltd | Professional & scientific | 2012 |
| Hales Farriers Ltd | Professional & scientific | 2012 |
| Hales Limousins Ltd | Agriculture & fishing | 2017 |
| Hales Property Investments Ltd | Real estate | 2017 |
| Half CUT Theatre Ltd | Arts & recreation | 2021 |
| Half Light Design Limited | Professional & scientific | 2021 |
| Half Moon Creative Arts C.I.C. | Education | 2017 |
| Halfpenny Enterprises Limited | Real estate | 1990 |
| Halivand Limited | Information & communication | 2023 |
| Hall Farm Lolworth Management Company Limited | Households | 2005 |
| Hallam Taylor Limited | Professional & scientific | 2018 |
| Halloughton Investments Limited | Real estate | 1986 |
| Halls of Cambridge Limited | Wholesale & retail | 2011 |
| Halmai Beauty Ltd | Wholesale & retail | 2025 |
| Halobios Norway AS Co., Ltd | Wholesale & retail | 2026 |
| Halstead Antiques Ltd | Wholesale & retail | 2019 |
| Ham-Let CFS Ltd | Manufacturing | 1987 |
| Hamble Composites Ltd | Manufacturing | 2019 |
| Hambleberry Court Management Company Limited | Households | 1986 |
| Hamdah Limited | Manufacturing | 2017 |
| Hamid Construction Ltd | Financial services | 2022 |
| Hamillroad Limited | Information & communication | 2017 |
| Hamillroad Software Limited | Information & communication | 2002 |
| Hamils Ltd | Wholesale & retail | 2024 |
| Hamilton Court Management (Cambridge) Limited | Households | 2006 |
| Hamilton Hatt Limited | Wholesale & retail | 2023 |
| Hamim Khan Limited | Real estate | 2022 |
| Hamish Dickson Tree Specialist Ltd | Agriculture & fishing | 2026 |
| Hamish Irving Consulting Ltd | Information & communication | 2024 |
| Hamlock Smart Hamilton Partners Ltd | Professional & scientific | 2014 |
| Hammer and Tong Productions Limited | Information & communication | 2011 |
| Hampo Limited | Real estate | 2024 |
| Hampshire Broadband Limited | Information & communication | 2017 |
| Hampshire Mobile Park Home Enterprises Limited | Real estate | 2015 |
| Hampson Construction Group Ltd | Construction | 2018 |
| Hamza Mrbt Limited | Other services | 2022 |
| Hanaakari Ltd | Manufacturing | 2024 |
| Hanave Ibmt Ltd | Education | 2026 |
| Hanchel Limited | Real estate | 2010 |
| Hand Auger Properties Limited | Real estate | 2022 |
| Hand Picked Motors Ltd | Wholesale & retail | 2020 |
| Handan Ruisu Fastener Manufacturing Co., Ltd | Extraterritorial | 2019 |
| Hands on Dyslexia Ltd | Education | 2025 |
| Handythingscambridge Limited | Agriculture & fishing | 2025 |
| Hangzhou Fuyang Mykey IMP & EXP Co., Ltd. | Extraterritorial | 2013 |
| Hangzhou Huatai Metering System Co., Ltd | Wholesale & retail | 2021 |
| Hangzhou Lingeba Technology Co., Ltd | Extraterritorial | 2014 |
| Hangzhou Wuxing Printing Co., Ltd | Wholesale & retail | 2020 |
| Hanna Ship Technology Co., Ltd | Professional & scientific | 2013 |
| Hannah Solutions Limited | Information & communication | 2010 |
| Hannington Couriers Ltd | Transport & logistics | 2018 |
| Hansa Hire Limited | Administrative & support | 1962 |
| Hansmed Ltd | Health & social care | 2021 |
| Hanwin Holdings Limited | Wholesale & retail | 2023 |
| HAO Marine Co., Ltd | Wholesale & retail | 2025 |
| Haofengqiu Limited | Hospitality | 2016 |
| Haohai Trade Ltd | Wholesale & retail | 2024 |
| Haole International Trading Co., Ltd | Wholesale & retail | 2024 |
| Haos Global Co., Ltd. | Manufacturing | 2025 |
| Haotian Ltd | Real estate | 2024 |
| Haotoo Industry Co., Ltd | Extraterritorial | 2020 |
| Haowang International Holdings Limited | Extraterritorial | 2015 |
| Haoyang Import and Export Co., Ltd | Wholesale & retail | 2025 |
| Happigo Technology Co., Ltd | Information & communication | 2022 |
| Happy Airbnb Limited | Hospitality | 2022 |
| Happy ANA Composites Ltd | Manufacturing | 2024 |
| Happy Car Deals Ltd | Wholesale & retail | 2024 |
| Happy Feet Happy Mind Limited | Health & social care | 2018 |
| Happy Hens Childcare Ltd | Health & social care | 2020 |
| Happy Joyment Limited | Information & communication | 2026 |
| Happyserver Limited | Information & communication | 2010 |
| Haptos Limited | Manufacturing | 2026 |
| Hara Bites Ltd | Hospitality | 2025 |
| Harbel Limited | Construction | 2016 |
| Harben Investments Ltd | Real estate | 2017 |
| Hard Riders Limited | Wholesale & retail | 2011 |
| Hardee-Kerr Limited | Agriculture & fishing | 2015 |
| Hardstate Limited | Manufacturing | 2003 |
| Hardwick Bridge Country Park Limited | Hospitality | 2015 |
| Hardwick Community Centre | Hospitality | 2022 |
| Hardwick Farming Company Limited | Agriculture & fishing | 2023 |
| Hardwick Fitness Ltd | Arts & recreation | 2024 |
| Hardwick Stores Ltd | Wholesale & retail | 2014 |
| Hardwicke Gardens (Market Deeping) Management Company Limited | Households | 2010 |
| Hare House Consulting Ltd | Information & communication | 2024 |
| Harford Way Residents Association Limited | Households | 1989 |
| Hargrave Partnerships Ltd. | Construction | 2013 |