| GMR Solutions Ltd | Financial services | 2019 |
| Goddard Residential Ltd | Real estate | 2021 |
| Gold Hawk Music Limited | Information & communication | 1995 |
| Goldsynergy Solutions Ltd | Information & communication | 2020 |
| Good Health Publications Limited | Extraterritorial | 1999 |
| Gourmet Genetics Limited | Administrative & support | 2020 |
| Govleave Ltd | Information & communication | 2024 |
| Govresources Limited | Professional & scientific | 2012 |
| Grace Groundworks & Construction Ltd | Construction | 2021 |
| Grace Lettings Limited | Real estate | 2021 |
| Gradeson Properties Ltd | Hospitality | 2026 |
| Graftgold Studios Ltd | Information & communication | 2024 |
| Grand Avenue Developments (Withdean) Ltd | Real estate | 2020 |
| Grand Avenue Developments 2 Limited | Real estate | 2022 |
| Grand Avenue Developments Limited | Real estate | 2019 |
| Grandflame Limited | Information & communication | 1993 |
| Granite Morgan Smith Limited | Professional & scientific | 2011 |
| Gravitation Limited | Professional & scientific | 2023 |
| Great British Spirits Ltd | Manufacturing | 1992 |
| Great Easton Ltd | Construction | 2025 |
| Great Harvest Foods Limited | Hospitality | 2023 |
| Great Shephard Medical Limited | Administrative & support | 2015 |
| Green & Castle Limited | Administrative & support | 2010 |
| Greenock Internet Services Limited | Professional & scientific | 1995 |
| Greenpup Ltd | Wholesale & retail | 2025 |
| Greenstead Fish and Chip Shop Limited | Hospitality | 2003 |
| Greystone Construction & Developments Limited | Construction | 2020 |
| GRI Consulting Limited | Information & communication | 2016 |
| Grimley’S Consultancy Limited | Professional & scientific | 2025 |
| Grow Design Studio Limited | Professional & scientific | 2014 |
| GSO Recruitment Ltd | Administrative & support | 2025 |
| GTC Pharma Limited | Health & social care | 2019 |
| Gtrax Limited | Construction | 2025 |
| Gwent Internet Services Limited | Professional & scientific | 1995 |
| Gwynedd Internet Services Limited | Professional & scientific | 1995 |
| H. Morris & Company Limited | Manufacturing | 1914 |
| H. Padfield (Ongar Farms) Limited | Agriculture & fishing | 1986 |
| H4P Security Services Ltd | Administrative & support | 2024 |
| Hair by OOH LA LA Limited | Other services | 2017 |
| Hair Gallery Limited | Other services | 1999 |
| Hairwit Ltd | Other services | 2019 |
| Hallwood Associates Limited | Professional & scientific | 2012 |
| Hampshire Internet Services Limited | Professional & scientific | 1995 |
| Handpiece Express Limited | Extraterritorial | 2014 |
| Handy Electrics Ltd | Construction | 2021 |
| Hanick Rail Limited | Professional & scientific | 2013 |
| Hardal Ltd | Hospitality | 2025 |
| Hardy & Hewett Limited | Administrative & support | 2000 |
| Harlow Van Sales Limited | Wholesale & retail | 2020 |
| Harris and Box Vehicle Solutions Ltd | Wholesale & retail | 2020 |
| Harrow Resuscitation and Trauma Service Limited | Health & social care | 2016 |
| Hart Motoring Services Limited | Transport & logistics | 2010 |
| Harvey Darke Funeral Service Limited | Other services | 2000 |
| Haskam Limited | Households | 2017 |
| Hastings Management Consultants Ltd | Construction | 2018 |
| Hasturk Stansted Ltd | Hospitality | 2025 |
| Haunted Essex Ltd | Wholesale & retail | 2026 |
| Haunton Homes Ltd | Real estate | 2025 |
| Havelock Property Holdings Ltd | Real estate | 2018 |
| Haversham Publications Limited | Extraterritorial | 1989 |
| Hawaii Products Limited | | 1991 |
| Hawthorn Agencies Limited | Construction | 2008 |
| Haydn Construction Ltd | Construction | 2019 |
| Hayes Kitchens Limited | Wholesale & retail | 2013 |
| Hayland Tiling Company Limited | Wholesale & retail | 2001 |
| Hayman Group Ltd | Extraterritorial | 2021 |
| Hazell Homes Limited | Construction | 2024 |
| Hazell Hospitality Ltd | Hospitality | 2018 |
| Hazell Preservation Limited | Construction | 2019 |
| Hcpc Training Ltd | Professional & scientific | 2015 |
| HD Electrical Testing & Maintenance Ltd | Construction | 2021 |
| Heads UP PGB Limited | Administrative & support | 2014 |
| Healthcare Quality Solutions Limited | Health & social care | 2016 |
| Heatseal ID Ltd | Manufacturing | 2011 |
| Heaven Nature Ltd | Manufacturing | 2024 |
| Heavenly Huts Limited | Hospitality | 2024 |
| Helen Palmer Ltd | Other services | 2014 |
| Helmstead Partners Ltd | Information & communication | 2025 |
| Hennel Accounts Limited | Professional & scientific | 2023 |
| Hennel Steel Limited | Construction | 2024 |
| Hennel Structures Limited | Manufacturing | 2024 |
| Henry Martin & Sons Ltd | Construction | 1997 |
| Henry Martin & Sons Trustee Ltd | Extraterritorial | 2025 |
| Hens and Furry Friends Limited | Agriculture & fishing | 2024 |
| Hereford and Worcester Internet Services Limited | Professional & scientific | 1995 |
| Herman Kuijper Ltd | Wholesale & retail | 2024 |
| Hermes CPC Consultancy Limited | Professional & scientific | 2013 |
| Hertfordshire Internet Services Limited | Professional & scientific | 1995 |
| Herts and Essex Shooting Association | Other services | 2009 |
| Highfield Security Limited | Construction | 2025 |
| Hill Broad Associates Limited | Professional & scientific | 2018 |
| Hillcrest Systems Limited | Information & communication | 2025 |
| Hillcroft Security Limited | Administrative & support | 2022 |
| Hills FD Services Ltd | Professional & scientific | 2025 |
| Hive Bruton Limited | Hospitality | 2020 |
| HJS Catering Silver END Ltd | Hospitality | 2019 |
| HL Creative LLP | | 2025 |
| HLF Properties Limited | Real estate | 2021 |
| Holden Buildings Ltd | Construction | 2023 |
| Holiday Hangout Ltd | Health & social care | 2024 |