| Generation Gymnastics CIC | Arts & recreation | 2018 |
| Generation Travel Group Ltd | Administrative & support | 2016 |
| Gerry Francis Limited | Other services | 1973 |
| GET Your PAD Ltd | Real estate | 2025 |
| Getmydrivingl Ltd | Transport & logistics | 2018 |
| Gloucester Road 1962 Limited | Extraterritorial | 2014 |
| Glynswood Developments Limited | Construction | 2024 |
| Gray Family Holdings Ltd | Health & social care | 2025 |
| Green Grass Land Investments Ltd | Real estate | 2016 |
| Greenfield Property Developments Limited | Real estate | 1998 |
| Greenwise Group Ltd | Construction | 2025 |
| GU24 Investments Ltd | Real estate | 2025 |
| H W Care Centre Limited | Health & social care | 2022 |
| H&M Barbers Shop Limited | Other services | 2020 |
| HA2 FC Ltd | Real estate | 2026 |
| Halebourne Bicester Care Home Limited | Health & social care | 2026 |
| Halebourne Care Group Limited | Financial services | 2021 |
| Halebourne Developments Limited | Real estate | 2009 |
| Halebourne Group Limited | Real estate | 2009 |
| Halebourne Hartley Wintney Limited | Real estate | 2022 |
| Halebourne Waltham Abbey Limited | Real estate | 2014 |
| Hall Grove School Limited | Education | 2009 |
| Hall Grove Test Centre Ltd | Wholesale & retail | 2018 |
| Handshake Group Limited | Information & communication | 2025 |
| Happysparks Homeopathy Ltd | Health & social care | 2024 |
| Hart and Whitewater Investments Limited | Health & social care | 2022 |
| Hatton Homes Investment Limited | Real estate | 2026 |
| Hawkesworth Consulting Limited | Administrative & support | 2014 |
| Health Optimisation (Summit US) Ltd | Health & social care | 2018 |
| Health Optimisation (Summit) Ltd | Health & social care | 2019 |
| Health Optimisation Supplements Ltd | Wholesale & retail | 2020 |
| Heartwood Home Renovations Limited | Real estate | 2026 |
| Heatherview Limited | Professional & scientific | 2018 |
| Hedge END Care Home Limited | Real estate | 2013 |
| Hermes Mondial Enterprises Ltd | Financial services | 2009 |
| Hi-Pro Property Limited | Real estate | 2013 |
| Highpine Developments Limited | Construction | 2025 |
| Highpine Property Limited | Real estate | 2025 |
| Hitec International Limited | Financial services | 2020 |
| Holy Smokers Ltd | Manufacturing | 2024 |
| Homes (Haywards Heath) Limited | Professional & scientific | 2006 |
| Homes Midlands Limited | Professional & scientific | 2000 |
| Homes South East Limited | Professional & scientific | 1989 |
| Homes Southern Limited | Professional & scientific | 1986 |
| Homes Wessex Limited | Professional & scientific | 2000 |
| Honeywebb Properties Limited | Real estate | 2026 |
| Hong Ltd | Hospitality | 2015 |
| Hopewell & Dean Associates Ltd | Other services | 2011 |
| Hubertus Consulting Limited | Professional & scientific | 2013 |
| Hurst Farm Land Ltd | Real estate | 2026 |
| IAN Hamilton Design & Consultancy Limited | Professional & scientific | 2012 |
| Iknowso Limited | Wholesale & retail | 2025 |
| Infinite Builders Limited | Construction | 2024 |
| Infra Engineering Practice Limited | Professional & scientific | 2025 |
| Ingots WE Trust Ltd | Manufacturing | 2022 |
| Innovate Property Solutions Ltd | Construction | 2016 |
| Inside Consulting Limited | Professional & scientific | 2003 |
| Insights Engine Limited | Information & communication | 2022 |
| Insinc Property Limited | Construction | 2004 |
| International Cricket Programme Limited | Arts & recreation | 2016 |
| International Ventures Limited | Construction | 2003 |
| Intro NW Limited | Other services | 2019 |
| Iqedx Limited | Wholesale & retail | 2023 |
| Irhythm Technologies Ltd. | Administrative & support | 2016 |
| ITT Transport Limited | Wholesale & retail | 2016 |
| Iver Fabrications Limited | Manufacturing | 2004 |
| IWT Design Limited | Manufacturing | 2025 |
| J B Caines Ltd | Administrative & support | 2022 |
| J&L Projects Ltd | Construction | 2022 |
| Jane DE Vries Consulting Ltd | Professional & scientific | 2015 |
| Jariya Thai Massage & Spa Ltd | Health & social care | 2024 |
| JCJ Legacy Ltd. | Real estate | 2016 |
| Jeet Corporation Ltd | Manufacturing | 2021 |
| Jesmond House Limited | Health & social care | 2009 |
| JJ Concierge Services Ltd | Administrative & support | 2025 |
| JKS97 Limited | Other services | 2016 |
| JMP TEK Ltd | Information & communication | 2025 |
| John Woolsey Limited | Real estate | 2013 |
| Jomoval Ltd | Wholesale & retail | 2011 |
| Jonathan Markson Tennis (Oxford) Limited | Arts & recreation | 1998 |
| Jotech Solutions Limited | Information & communication | 1998 |
| Journey to the Heart Ltd | Other services | 2024 |
| Joysatgunam Ltd | Information & communication | 2026 |
| JP Everett Limited | Financial services | 2010 |
| JSG Cars Ltd | Wholesale & retail | 2025 |
| JSG Developers Ltd | Construction | 2025 |
| JSG Property Portfolio Ltd | Real estate | 2025 |
| JSM Digital Limited | Professional & scientific | 2013 |
| Jtsouth Ltd | Information & communication | 2021 |
| Junction 3 Tyres Ltd | Wholesale & retail | 2024 |
| Juniper Rise Ltd | Information & communication | 2025 |
| JWP Building Innovations Ltd | Construction | 2024 |
| K V M Choice Ltd | Professional & scientific | 2002 |
| K.C. Autobody Ltd | Wholesale & retail | 2024 |
| KA Creative Agency Ltd | Information & communication | 2025 |
| Kapper IT Ltd | Information & communication | 2015 |
| Katy Nail Bagshot Ltd | Other services | 2022 |
| KCH Contracts Ltd | Construction | 2024 |
| Keep Collection Ltd | Wholesale & retail | 2021 |
| Kempletyne Limited | Professional & scientific | 1969 |