| Hermitage Park Management Company Limited | Real estate | 2016 |
| Hernando Ltd. | Real estate | 1997 |
| Heron Health Consulting Ltd | Health & social care | 2022 |
| Herons Crest Residents Limited | Households | 2005 |
| Herotecture Ltd | Arts & recreation | 2021 |
| Hestia Capital Management | Administrative & support | 2021 |
| Hestia Homes (Cranbrook) Limited | Construction | 2022 |
| Hestia Homes (Surrey) Limited | Real estate | 2022 |
| Hestia Homes Management Limited | Professional & scientific | 2022 |
| Heventa Ltd | Construction | 2015 |
| Hewhall Limited | Administrative & support | 2002 |
| Hewshott Holdings Limited | Professional & scientific | 2007 |
| Hewson Consulting Engineers Limited | Professional & scientific | 2005 |
| Hexa CGE Europe Holdings Limited | Financial services | 2021 |
| Hext Courier Service Limited | Transport & logistics | 2026 |
| Hexwav Records Limited | Information & communication | 2025 |
| HEY There Design Ltd | Health & social care | 2013 |
| Hg&L Capital Ltd | Financial services | 2024 |
| Hg&L Newcastle Limited | Arts & recreation | 2018 |
| Hhouse Legal Ltd | Professional & scientific | 2016 |
| HI Altitude Scaffolding Ltd | Construction | 2023 |
| HI Spec Leasing Limited | Wholesale & retail | 2010 |
| Hibberd Films Limited | Arts & recreation | 2021 |
| Hiddenlight Productions Limited | Information & communication | 2020 |
| Hide & Hammer Ltd | Manufacturing | 2019 |
| Hienkings Ltd | Professional & scientific | 2023 |
| Higgins UK Holdings Limited | Financial services | 2018 |
| High Barn Homes Ltd | Construction | 2024 |
| High Steep Ltd | Professional & scientific | 2022 |
| High View Management Solutions Ltd | Extraterritorial | 2020 |
| Highestpeak Agency Limited | Professional & scientific | 2026 |
| Highgate Hill House School Ltd | Education | 2015 |
| Highpoint Management Limited | Households | 2026 |
| Highview PVT Ltd | Real estate | 2019 |
| Highway Insurance Company Limited | Financial services | 1999 |
| Highway Insurance Group Limited | Financial services | 1994 |
| Higlett & Swayne Limited | | 1960 |
| Hilary Rowland Limited | Professional & scientific | 2023 |
| Hill House (Godalming) Limited | Households | 1987 |
| Hill Sport Limited | Administrative & support | 2003 |
| Hill Station Limited | Hospitality | 2018 |
| Hillier Brook Ltd | Real estate | 2021 |
| Hilltop Design Limited | Wholesale & retail | 2023 |
| Hilt Accountancy Services Limited | Professional & scientific | 2018 |
| Hing YIP Auto Service Ltd | Wholesale & retail | 2024 |
| Hintoral Ltd | Wholesale & retail | 2024 |
| Hipley Court Management Company Limited | Households | 1976 |
| Hipperson Construction Limited | Construction | 2011 |
| Hipperson Properties Limited | Real estate | 2024 |
| Hipps Estate Agents Limited | Extraterritorial | 2005 |
| Hird Property Limited | Real estate | 2002 |
| Hiring Made Simple Ltd | Administrative & support | 2020 |
| Historic VR Ltd | Information & communication | 2020 |
| Hitherbury House Management Company Limited | Households | 2017 |
| Hive Intelligence Limited | Information & communication | 2010 |
| Hive Windows Ltd | Construction | 2024 |
| Hiveray Investments Limited | Real estate | 1970 |
| HJK Ventures Ltd | Financial services | 2022 |
| Hjwp Ltd | Professional & scientific | 2014 |
| HLC Surrey Limited | Other services | 2026 |
| HLG Groundwork and Construction Ltd | Construction | 2026 |
| HLP Magnet Limited | Information & communication | 2021 |
| HLP Studios Limited | Information & communication | 2021 |
| HLS Consultancy Limited | Professional & scientific | 2002 |
| Hmeh Limited | Hospitality | 2019 |
| HMS23 Limited | Financial services | 2023 |
| HOC London Ltd | Construction | 2018 |
| Hockley & Dawson Consulting Engineers Limited | Professional & scientific | 1999 |
| Hockman Homes Ltd | Construction | 2025 |
| Hodgson Gardens Freehold Company Limited | Households | 2013 |
| Hofmeister Enterprises Ltd | Wholesale & retail | 2016 |
| Hog's Back Paddock Services Limited | Administrative & support | 2011 |
| Hogs Back Farm Limited | Agriculture & fishing | 2024 |
| Hokkaido Marche International Company Limited | Manufacturing | 2022 |
| Holdant Ltd | Professional & scientific | 2020 |
| Holder Show Team Ltd | Other services | 2016 |
| Holiday Additions Limited | Wholesale & retail | 2003 |
| Hollie Field Eventing Ltd | Other services | 2019 |
| Holloway Bathrooms Plumbing Contractors Limited | Construction | 2019 |
| Holly Landscape & Training Ltd | Administrative & support | 2023 |
| Holmbury Estates Limited | Real estate | 2016 |
| Holmes & Away Limited | Information & communication | 2009 |
| Holmes HR Consulting Ltd | Administrative & support | 2016 |
| Holos Change Ltd | Other services | 2014 |
| Hombe Ltd | Wholesale & retail | 2024 |
| Home 247 Ltd | Construction | 2022 |
| Home Counties Carers Limited | Health & social care | 2011 |
| Home Made Easy Ltd | Professional & scientific | 2011 |
| Home Solutions ( DLB ) Limited | Construction | 2023 |
| Home Staging Association Ltd | Other services | 2018 |
| Home Sweet BEE Ltd | Wholesale & retail | 2021 |
| Home Touch Interiors Ltd | Wholesale & retail | 2023 |
| Home-Approved Building Surveyors Limited | Professional & scientific | 2014 |
| Homelectrics Ltd | Construction | 2023 |
| Homes by Durrant Limited | Construction | 2023 |
| Homes Estate Agents Group Ltd | Real estate | 2025 |
| Homes Estate Agents Lettings Ltd | Real estate | 2025 |
| Homestay Lettings Ltd | Real estate | 2021 |
| Hone Investments Limited | Administrative & support | 2018 |
| Honey B Hair Ltd | Other services | 2015 |