| Halthom Associates Limited | Financial services | 2013 |
| HAM CT Management Limited | Professional & scientific | 2010 |
| Hammersmith Roofing and Building Ltd | Construction | 2025 |
| Hanbury Healthcare Limited | Real estate | 1990 |
| Happitat Limited | Professional & scientific | 2017 |
| Hare & Bone Education Ltd | Education | 2024 |
| Harlequin Tiles Limited | Wholesale & retail | 2020 |
| Harmony in Education | Administrative & support | 2021 |
| Harmony in Nature CIC | Health & social care | 2023 |
| Harrison Electrical Contractors (U.K) Limited | Construction | 2016 |
| Harrison Telescopes Ltd | Wholesale & retail | 2009 |
| Hart and Wyatt Ltd | Professional & scientific | 2023 |
| Harvey and Hiranandani Beverages Limited | Manufacturing | 2025 |
| Have Blue Ltd | Real estate | 2018 |
| HAW Consulting Ltd | Professional & scientific | 2013 |
| Hayler Fire Ltd | Construction | 2023 |
| Hazelwood Search Ltd | Administrative & support | 2019 |
| Hc-Customs Limited | Financial services | 2024 |
| Hdrentals Limited | Other services | 2025 |
| Headstart Early Years Ltd | Health & social care | 2019 |
| Headstart Wellbeing Ltd | Education | 2024 |
| Health Content Company Ltd | Professional & scientific | 2022 |
| Healthqo Care Professionals Ltd | Wholesale & retail | 2021 |
| Healthwise International Limited | Professional & scientific | 2002 |
| Healthy Living in the Community Limited | Administrative & support | 2012 |
| Heart Mate Limited | Health & social care | 2024 |
| Heatherdown Gardens Residents Management Company Limited | Households | 2025 |
| Hedge Knight Productions Limited | Administrative & support | 2026 |
| Hedge-House Partners LLP | | 2007 |
| Helen Donnelly Consulting Limited | Administrative & support | 2024 |
| Helix Analytics Ltd | Financial services | 2018 |
| Help a Pet OUT Ltd | Information & communication | 2025 |
| Helping AID Foundation Ltd | Professional & scientific | 2023 |
| Herisse Limited | Wholesale & retail | 1973 |
| Hero Heating Ltd | Construction | 2023 |
| Hersham Golf Club Limited | Arts & recreation | 2008 |
| Hersham Valley Ltd | Hospitality | 2010 |
| Hersham Walton Valley Limited | Hospitality | 2026 |
| Hetikal Ltd | Health & social care | 2011 |
| Heyburn Bennett Ltd | Professional & scientific | 2010 |
| Hidden Cash Limited | Information & communication | 2016 |
| Hidden Maverick Ltd | Manufacturing | 2025 |
| Highgate Property Ventures Ltd | Real estate | 2025 |
| Highland Medical Limited | Health & social care | 1995 |
| Hillsdon Property Ltd | Real estate | 2020 |
| Hilson Roofing Limited | Construction | 2025 |
| Hireyourtransport.Com Ltd | Administrative & support | 2016 |
| Historical Breechloading Smallarms Association | Administrative & support | 2005 |
| HIT35 Bootcamp Ltd | Arts & recreation | 2019 |
| Hitoric Ltd | Information & communication | 2026 |
| HJH Properties Ltd | Real estate | 2022 |
| HMD Medical Ltd | Wholesale & retail | 2016 |
| HNM Consultant Ltd | Administrative & support | 2016 |
| Hobby Art Limited | Manufacturing | 2002 |
| Hodder’S Construction Ltd | Construction | 2020 |
| Hoil Dental Laboratory Ltd | Health & social care | 2011 |
| Hoil Dental Manufacture Solutions Ltd | Manufacturing | 2015 |
| Holistica Spaces Ltd | Information & communication | 2025 |
| Holly Beauty Ltd | Other services | 2026 |
| Holly Donoghue Ltd | Professional & scientific | 2019 |
| Holly Nails MB Ltd | Other services | 2023 |
| Hollydene (Hersham) Limited | Households | 2021 |
| Home County Properties Limited | Construction | 2013 |
| Home-Start Elmbridge | Professional & scientific | 2009 |
| Homeworks Surrey Ltd | Construction | 2026 |
| Honesty Accounts Ltd | Professional & scientific | 2018 |
| Hopes Heating Ltd | Construction | 2026 |
| Horizon Empire Limited | Wholesale & retail | 2024 |
| Hospitality Insights Group Limited | Information & communication | 2026 |
| Hough Building & Professional Services Limited | Construction | 2009 |
| House Creative Ltd | Information & communication | 2022 |
| House of Hougton Events and Hire Limited | Arts & recreation | 2023 |
| Hoverfly Media Limited | Information & communication | 2015 |
| HPS Windows Limited | Construction | 2015 |
| HR101 Ltd | Professional & scientific | 2013 |
| HRH Hair & Beauty Freelance Services Ltd | Other services | 2022 |
| Hubalong Limited | Information & communication | 2025 |
| Hugo Wells Private Finance Limited | Financial services | 2024 |
| Human Auto Cell Limited | Professional & scientific | 2014 |
| Hummingbird HR Ltd | Administrative & support | 2021 |
| Humn Potential Ltd | Administrative & support | 2025 |
| Husband & Wife Cleaning Team Ltd | Administrative & support | 2020 |
| Hutton Close Management Co Limited | Real estate | 2005 |
| Huxli Holdings Limited | Professional & scientific | 2016 |
| HWM Sports Cars Limited | Wholesale & retail | 1938 |
| HWM Works Limited | Wholesale & retail | 2021 |
| Hyperion Electrical Installations Ltd | Construction | 2021 |
| Hyperspeed (UK) Limited | Manufacturing | 2007 |
| I.F.C. Design & Build Ltd | Construction | 1999 |
| Iain Cowden Ltd | Information & communication | 2011 |
| IDI Macro Consulting Services Limited | Administrative & support | 2017 |
| IKS Consulting Limited | Professional & scientific | 2014 |
| Immortal Developments Limited | Construction | 2022 |
| Immortal Lifestyle Limited | Construction | 2023 |
| Impact Health Research Limited | Professional & scientific | 2012 |
| Impact Research Ltd | Professional & scientific | 2010 |
| Imperium OS Ltd | Information & communication | 2026 |
| Impimoya Limited | Information & communication | 2015 |
| Inco Robotics Limited | Information & communication | 2019 |
| Independently East Limited | Financial services | 1996 |