| GW Accountancy Services Ltd | Professional & scientific | 2008 |
| Gyfty Limited | Other services | 2015 |
| Gyoshoya.Uk Ltd | Hospitality | 2022 |
| H & H Contract Scaffolding Ltd | Construction | 2005 |
| H & H Medical Limited | Professional & scientific | 2006 |
| H&H Construction Group Ltd | Professional & scientific | 2013 |
| H&H Scaffolding Labour Limited | Construction | 2014 |
| H&I Property Ltd | Real estate | 2021 |
| H&Zee Transport Ltd | Transport & logistics | 2026 |
| H. P. Publications Ltd | Manufacturing | 2014 |
| H.E.T. Limited | Transport & logistics | 2003 |
| H.J.C. Services Limited | Construction | 1998 |
| H.J.Wadley and SON Limited | Construction | 1958 |
| H2H Storage Solutions Ltd | Transport & logistics | 2020 |
| H2OX Limited | Extraterritorial | 2021 |
| Haace Asset Management Limited | Administrative & support | 2026 |
| Haace Holdings Limited | Financial services | 2026 |
| HAB Packing Limited | Administrative & support | 2023 |
| Habis Dental Limited | Health & social care | 2016 |
| Hable Education Ltd | Information & communication | 2014 |
| Hable Limited | Information & communication | 2016 |
| Hackerrank UK Limited | Information & communication | 2017 |
| Hadrian Way Management Company Limited | Households | 2017 |
| Hagat Group Ltd | Professional & scientific | 2016 |
| Hagat Properties Ltd | Real estate | 2020 |
| Hagerty Enthusiast Limited | Other services | 2021 |
| Hagerty International Holdings Limited | Financial services | 2005 |
| Hagerty International Limited | Financial services | 2005 |
| Hairlab+ Limited | Other services | 2025 |
| HAJ Distributions Ltd | Wholesale & retail | 2026 |
| Hakan Store Ltd | Wholesale & retail | 2025 |
| Halcyon International Limited | Professional & scientific | 1994 |
| Hale and Sons Ltd | Construction | 2016 |
| Hallmark Decorators Limited | Construction | 2013 |
| Hamilton Homes & Properties Ltd | Real estate | 2024 |
| Hamilton Solutions Ltd | Health & social care | 2022 |
| Hamlin Camera's Ltd | Professional & scientific | 2020 |
| Hangar 136 Limited | Wholesale & retail | 2021 |
| Hanger Storage & Logistics Limited | Transport & logistics | 2022 |
| Hanna Walton Limited | Administrative & support | 2016 |
| Hannah Eagle Limited | Arts & recreation | 2017 |
| Happy Hub Properties Ltd | Real estate | 2024 |
| Hard 8 Limited | Financial services | 2013 |
| Hardide Aerospace Coatings Limited | Manufacturing | 2013 |
| Hardide Coatings Limited | Manufacturing | 2000 |
| Hardide PLC | Manufacturing | 2005 |
| Harlesford Holdings Limited | Financial services | 2022 |
| Harlesford Property Limited | Real estate | 2022 |
| Harrell's Telecoms Ltd | Professional & scientific | 2018 |
| Hart Nurse Ltd | Professional & scientific | 2004 |
| Hartwool Limited | Transport & logistics | 1980 |
| Hashtagind Ltd | Administrative & support | 2024 |
| Hatar Limited | Financial services | 2014 |
| Havenhill Properties Ltd | Real estate | 2003 |
| Hawthorn Landscapes Ltd | Administrative & support | 2024 |
| Hazals Barber Ltd | Other services | 2019 |
| Hazlemere Preschool Limited | Education | 2013 |
| Hazy Sun Images Limited | Arts & recreation | 2008 |
| Hbfs Technology Solutions Limited | Information & communication | 2026 |
| HCT21 Ltd | Health & social care | 2023 |
| HE WHO Bakes Ltd | Hospitality | 2021 |
| Headfirst Hypnotherapy Limited | Health & social care | 2023 |
| Healey FOX Ltd | Real estate | 2009 |
| Healing Grove Ltd | Health & social care | 2025 |
| Health and Safety Scholar Limited | Other services | 2013 |
| Heartland Investments LLP | | 2021 |
| Heathcliff Associates Ltd | Information & communication | 2018 |
| Heating & Plumbing Solutions Ltd | Construction | 2018 |
| Hedley Group Limited | Financial services | 2025 |
| Hedley Studios Club Limited | Arts & recreation | 2020 |
| Hedley Studios Limited | Manufacturing | 2026 |
| HEH Advisory Ltd | Professional & scientific | 2026 |
| HEH Developments Ltd | Construction | 2026 |
| HEH Property Ltd | Real estate | 2023 |
| Helin Limited | Hospitality | 2012 |
| Help ME Move Ltd | Transport & logistics | 2021 |
| Help Sphere Family Services Ltd. | Health & social care | 2025 |
| Hempsec Ltd. | Professional & scientific | 2013 |
| Hempton Equestrian Services Limited | Other services | 2025 |
| Henderson Electrical Limited | Manufacturing | 2020 |
| Henley Cavapoos Limited | Other services | 2019 |
| Henstridge Construction Ltd | Construction | 2019 |
| Hera Driving School Ltd | Education | 2022 |
| Heraldic Media Limited | Information & communication | 1997 |
| Heritage Engineering Limited | Professional & scientific | 2016 |
| Heritage Motoring Group Ltd | Financial services | 2012 |
| Heritage Plastering Services Limited | Construction | 2003 |
| Heritage Realty Ltd | Real estate | 2025 |
| Heritage Scaffolding Services Ltd | Construction | 2024 |
| Heritage Skills Academy Limited | Administrative & support | 2016 |
| Heritage Storage Limited | Administrative & support | 2024 |
| Hernandez Investments Ltd | Real estate | 2025 |
| Hernes Close Residents Association Limited | Households | 1970 |
| Hero Café Limited | Hospitality | 2020 |
| Hero Club Limited | Other services | 2009 |
| Hero Events Limited | Administrative & support | 2009 |
| Hero House Limited | Financial services | 2021 |
| Heron and Swan Lodges Limited | Real estate | 2026 |
| Hestia Aesthetics Ltd | Health & social care | 2020 |
| Heyford Commercial Development Limited | Real estate | 2012 |