| HBA Meadows Limited | Real estate | 2020 |
| HBC Aviation Ltd | Manufacturing | 2024 |
| HC Property Lettings (Holdings) Ltd | Financial services | 2022 |
| HC Property Lettings Limited | Real estate | 2006 |
| Hc-Cnc Ltd | Manufacturing | 2026 |
| Hciss Ltd | Hospitality | 2015 |
| HCP Aero Consulting Ltd | Professional & scientific | 2024 |
| HD Digital Limited | Information & communication | 2021 |
| HDB Science Limited | Professional & scientific | 2007 |
| HDR Nova Limited | Professional & scientific | 2021 |
| Head First (Newmarket) Limited | Other services | 2003 |
| Headlight Lens Cover Ltd | Extraterritorial | 2023 |
| Headline Music Limited | Other services | 2013 |
| Headline Studios Ltd | Other services | 2026 |
| Headman Group International Limited | Wholesale & retail | 2023 |
| Heads of the Valleys Development Company Limited | Construction | 2011 |
| Headstart Clinics Ltd | Health & social care | 2018 |
| HEADSTART4BABIES Limited | Health & social care | 2005 |
| Healing Balm Ministries CIC | Other services | 2024 |
| Health & Pleasure Ltd | Wholesale & retail | 2016 |
| Health & Safety Works Limited | Professional & scientific | 2002 |
| Health CHOICE24 UK Ltd | Administrative & support | 2024 |
| Health Data Insight C.I.C. | Information & communication | 2011 |
| Health Enterprise East Limited | Professional & scientific | 2004 |
| Health Focus (HF) Ltd. | Professional & scientific | 2000 |
| Health Tech Enterprise Limited | Professional & scientific | 2022 |
| Healthed Initiative Ltd | Information & communication | 2025 |
| Healthera Ltd | Information & communication | 2015 |
| Healthieruk Ltd | Administrative & support | 2018 |
| Healthsense Intelligence Ltd | Extraterritorial | 2025 |
| Healthtech Holdings Ltd | Information & communication | 2022 |
| Healthwave Digital Innovations Ltd | Professional & scientific | 2023 |
| Healthy and Happy Hormones Limited | Health & social care | 2021 |
| Healthy Nature Ltd | Agriculture & fishing | 2024 |
| Healthy Nudge Ltd | Health & social care | 2022 |
| Healx Limited | Professional & scientific | 2014 |
| Heap-Comet Limited | Professional & scientific | 1986 |
| Hearable Ltd | Information & communication | 2013 |
| Hearing Healthcare Centre Limited | Health & social care | 2003 |
| HEARINGAIDS4U Ltd | Wholesale & retail | 2015 |
| Hearsay Nanomaterials Limited | Professional & scientific | 2019 |
| Heart Care Group Ltd | Information & communication | 2017 |
| Heart of Glass Ltd | Arts & recreation | 2024 |
| Heart Property Services Ltd | Households | 2019 |
| Heart-Club Ltd | Extraterritorial | 2021 |
| Heartfelt Medical Ltd | Manufacturing | 2020 |
| Heartfelt Technologies Ltd | Professional & scientific | 2015 |
| Heartsharman PVT Ltd. | Health & social care | 2024 |
| Heartwood Health Limited | Professional & scientific | 2024 |
| Heat Pump Company (Cambridge) Limited | Construction | 2025 |
| Heat Sense Plumbing & Heating Ltd | Construction | 2010 |
| Heatarmour Limited | Manufacturing | 2020 |
| Heatcam Limited | Construction | 2006 |
| Heath House Owners Limited | Households | 2006 |
| Heath Retreat Limited | Hospitality | 2016 |
| Heather Park Management Company Limited | Households | 2025 |
| Heating & Plumbing Resolutions Ltd | Administrative & support | 2008 |
| Heating Controls Online Limited | Wholesale & retail | 2010 |
| Heaven Building Services Ltd | Construction | 2018 |
| Hebei Fangke New Material Technology Co., Ltd. | Extraterritorial | 2022 |
| Hebei Hongkuo Trading Co., Ltd | Wholesale & retail | 2021 |
| Hebei Huiqun Industrial Co., Ltd | Extraterritorial | 2012 |
| Hebei Ikia Industry and Trade Co., Ltd | Wholesale & retail | 2018 |
| Hebei Pusai Steel Wire Rope Co., Ltd | Wholesale & retail | 2023 |
| Hebei Saichuang New Material Technology Co., Ltd | Administrative & support | 2023 |
| Hebei Yusu Protective Products Co., Ltd. | Wholesale & retail | 2024 |
| Hebo Bicycle Co., Ltd | Extraterritorial | 2021 |
| HEC Construction Limited | Construction | 2016 |
| HEC Group Ltd | Construction | 2022 |
| HEC Infrastructure Limited | Construction | 2022 |
| HEC Plant Hire Ltd | Administrative & support | 2025 |
| Hector Engineering Ltd | Manufacturing | 2019 |
| Hectorfit Limited | Manufacturing | 2018 |
| Hectors House Surveys Ltd | Professional & scientific | 2022 |
| Hedera Innovations Limited | Information & communication | 2007 |
| Hedry Ltd | Administrative & support | 2025 |
| Hefaure Cambridge Ltd | Wholesale & retail | 2024 |
| Hefei Sunrise Machinery Co., Ltd | Wholesale & retail | 2023 |
| Heidi Welch Consulting Ltd | Professional & scientific | 2024 |
| Heilongjiang Sinoid Trading Co., Ltd | Extraterritorial | 2015 |
| Heim Health Ltd | Information & communication | 2022 |
| Heirs Studio Ltd | Information & communication | 2022 |
| Heleena Supply Chain Co., Ltd | Wholesale & retail | 2024 |
| Helen Basford Coaching Limited | Administrative & support | 2019 |
| Helen Bateman Travel Ltd | Administrative & support | 2025 |
| Helen Beauty Ltd | Other services | 2026 |
| Helen Craig Limited | Arts & recreation | 2002 |
| Helen Estates Ltd | Real estate | 2025 |
| Helen Fernandes Medicolegal Enterprises Limited | Professional & scientific | 2011 |
| Helen's Dreamworks Ltd | Professional & scientific | 2022 |
| Helford Creek View Limited | Real estate | 2013 |
| Heli AM Ltd | Manufacturing | 2023 |
| Heli HT Ltd | Manufacturing | 2024 |
| Heli JCF Ltd | Manufacturing | 2023 |
| Heli JL Ltd | Manufacturing | 2025 |
| Heli MC Ltd | Manufacturing | 2024 |
| Heli Paint SN Ltd | Manufacturing | 2023 |
| Heli PS Ltd | Manufacturing | 2023 |
| Heli SG Ltd | Manufacturing | 2023 |
| Heli SM Ltd | Manufacturing | 2024 |