| Gipsy Dharma Limited | Wholesale & retail | 2013 |
| GJB Haulage Ltd | Transport & logistics | 2011 |
| GJW Bespoke Ltd | Information & communication | 2016 |
| Glamora Furniture Ltd | Wholesale & retail | 2025 |
| Glebelands Management Company Limited | Households | 1988 |
| Glendevon Projects Ltd | Professional & scientific | 2022 |
| Global First Solar Limited | Construction | 2011 |
| Global-Cv-Library Ltd | Administrative & support | 2005 |
| GM Global Services Ltd | Wholesale & retail | 2019 |
| Gogreen Financial Services Ltd | Financial services | 2021 |
| Golden Fish Builders Ltd | Construction | 2019 |
| Golden Nails 88 Ltd | Other services | 2025 |
| Goldridge Management Limited | Real estate | 2002 |
| Goldstar Property Solutions Ltd | Construction | 2014 |
| Goldwater Systems Ltd | Information & communication | 1996 |
| Good Earth Ventures Limited | Wholesale & retail | 2025 |
| Good Life Hub Ltd | Real estate | 2020 |
| Goodge Entertainment Limited | Arts & recreation | 2013 |
| Gordon Court Management Company Limited | Households | 1994 |
| Gordon Property Services Limited | Construction | 2017 |
| Gowrings Mobility Group Limited | Manufacturing | 1978 |
| Gracie Academy Ltd | Arts & recreation | 2009 |
| Gracie Center Ltd | Arts & recreation | 2018 |
| Grange Park Enterprises Ltd | Administrative & support | 2021 |
| Greater Genius Limited | Health & social care | 2018 |
| Green Heating & Renewables Ltd | Construction | 2011 |
| Green Park Developments Limited | Professional & scientific | 2004 |
| Green Wombat Ltd | Professional & scientific | 2020 |
| Greenham Business Park Limited | Real estate | 2002 |
| Greenham Control Tower Limited | Arts & recreation | 2017 |
| Greenham Control Tower Trading Limited | Arts & recreation | 2018 |
| Greenpower Installations Limited | Construction | 2021 |
| Greenway Limited | Wholesale & retail | 1988 |
| GRI Strategies Ltd | Professional & scientific | 2018 |
| Griffin Nexus Limited | Information & communication | 2025 |
| Grome Ltd | Real estate | 2018 |
| Groom Design Limited | Professional & scientific | 2008 |
| Groom Estates ( Berkshire) Limited | Construction | 2013 |
| Groom Estates Holdings Limited | Real estate | 2018 |
| Groomers Limited | Manufacturing | 2000 |
| Growvantage Limited | Transport & logistics | 2025 |
| Grupo Industrial Zogg Ltd | Transport & logistics | 2016 |
| GT Homes Ltd | Construction | 2017 |
| GTO Events Limited | Administrative & support | 2014 |
| Guestexe Limited | Other services | 2021 |
| Gym Brew Ltd | Manufacturing | 2021 |
| H Daly Consulting Limited | Other services | 2019 |
| HA Prints Ltd | Wholesale & retail | 2025 |
| Haines Property Limited | Construction | 2021 |
| Haines Temperature Solutions Ltd | Manufacturing | 2021 |
| Hall International Limited | Information & communication | 1992 |
| HAM Villas Management Company Limited | Real estate | 2001 |
| Hambledon Homes Ltd | Construction | 2025 |
| Hamilton Mmart Limited | Information & communication | 2019 |
| Hampshire Adhd Ltd | Health & social care | 2024 |
| Happy Larder Co Ltd | Wholesale & retail | 2018 |
| Hard HAT Media Limited | Construction | 2010 |
| Harriet House Montessori School Limited | Education | 2009 |
| Harris Healthcare Solutions Ltd | Health & social care | 2006 |
| Harry Bentley Racing Limited | Arts & recreation | 2013 |
| Hart & Greene Limited | Construction | 2021 |
| Hashtag Twenty One Ltd | Wholesale & retail | 2021 |
| Hatcrete Ltd. | Wholesale & retail | 2015 |
| Havefun Swimming LLP | | 2015 |
| Hawkfield Partners Limited | Administrative & support | 2025 |
| Hayes & Yeading United F.C. Ltd. | Arts & recreation | 1954 |
| Hayley's Hair and Beauty Ltd | Other services | 2025 |
| Hazzas Group Ltd | Wholesale & retail | 2026 |
| HC Trophies Limited | Agriculture & fishing | 2025 |
| HCS Construction and Development Ltd | Construction | 2025 |
| HDS Express Transport Ltd | Transport & logistics | 2017 |
| Headley Tyres Ltd | Wholesale & retail | 1999 |
| Headleyrise Land Management Ltd | Households | 2026 |
| Headleyrise Track Ltd | Households | 2026 |
| Heartland Sitter for Dogs Ltd | Agriculture & fishing | 2018 |
| Heimdall Consulting Limited | Administrative & support | 2009 |
| Henry George Engineering Limited | Professional & scientific | 2024 |
| Henwick Audio Visual Networks Ltd | Manufacturing | 2023 |
| Henwick Properties LLP | | 2024 |
| Herbnautics Ltd | Manufacturing | 2021 |
| Heritage Wills, Probate and Inheritance Limited | Professional & scientific | 2020 |
| Hermitage Apartments Limited | Administrative & support | 2006 |
| Hermitage Court (Thatcham) Management Company Limited | Households | 2003 |
| Hermitage Media Limited | Information & communication | 2010 |
| Herts & Essex Newspapers Limited | Information & communication | 1968 |
| Heslops Associates Limited | Professional & scientific | 2012 |
| Hetrypa Ltd | Other services | 2024 |
| HHA Services Ltd | Professional & scientific | 2022 |
| Hidbrain Ltd | Information & communication | 2019 |
| Hifi Lane Ltd | Wholesale & retail | 2025 |
| Highclere Shutters Ltd | Wholesale & retail | 2018 |
| Highmore Estates Limited | Construction | 2014 |
| Highworth Asset Finance Limited | Administrative & support | 2021 |
| Hill Farm Shop Ltd | Wholesale & retail | 2003 |
| Hillier & Co Property Investments Ltd | Real estate | 2022 |
| Hillier Ventures Ltd | Professional & scientific | 2025 |
| Hinton LEA Associates Ltd | Administrative & support | 2000 |
| HJS Beauty Ltd | Other services | 2023 |
| HMS Goods Ltd | Wholesale & retail | 2022 |
| Hobby Horse Riding Activities Limited | Administrative & support | 2003 |