| Grosvenor Casinos (GC) Limited | Arts & recreation | 2012 |
| Grosvenor Casinos Limited | Arts & recreation | 1966 |
| Group DP Global Limited | Wholesale & retail | 2022 |
| Group Fabricom Limited | Financial services | 1982 |
| Grove 2016 Limited | Construction | 2016 |
| Grove 2020 Limited | Real estate | 2022 |
| Grove Construction (London) Limited | Construction | 2010 |
| Grove Court (Maidenhead) Residents Association Limited | Administrative & support | 1980 |
| Grove Elstead Limited | Construction | 2024 |
| Grove Homes (London) Limited | Construction | 2012 |
| Grove Interiors Ltd | Construction | 2025 |
| Grove Runnymede Ltd | Construction | 2025 |
| Grover UK Limited | Wholesale & retail | 2008 |
| Grow and Glow Property Solutions Ltd | Arts & recreation | 2014 |
| Growmore Realty Limited | Real estate | 2026 |
| Grubwood Meadow Limited | Real estate | 1995 |
| Grunenthal Limited | Wholesale & retail | 1998 |
| Grunenthal Meds Holdco Ltd | Administrative & support | 2022 |
| GS Asset Management Ltd | Extraterritorial | 2016 |
| GSC Consulting Limited | Information & communication | 2026 |
| GSE Associates Limited | Construction | 2004 |
| GSH Heating & Maintenance Ltd | Construction | 2017 |
| GT Asset Management Limited | Administrative & support | 2020 |
| GT Audio Visual Ltd | Professional & scientific | 2019 |
| GT Trends Ltd | Wholesale & retail | 2025 |
| Gtechsoft Limited | Information & communication | 2015 |
| Gther Ltd | Information & communication | 2021 |
| Guarantor Assure Limited | Financial services | 2024 |
| Guarantor Insure Limited | Extraterritorial | 2014 |
| Guardian Ridge Roofing Ltd | Construction | 2026 |
| Guidelink | Professional & scientific | 2004 |
| Guiding Star Limited | Professional & scientific | 1995 |
| Guildwright Limited | Professional & scientific | 1977 |
| Gulab Real Estate (UK) Ltd | Construction | 2021 |
| Gulls Consulting Limited | Professional & scientific | 2017 |
| Gumgum UK Limited | Information & communication | 2015 |
| Gunasekara & Co Limited | Professional & scientific | 2017 |
| Gunes Atlas Ltd | Manufacturing | 2024 |
| GUR Saihaj Renovations Limited | Construction | 2025 |
| Gurmilan Courier Limited | Transport & logistics | 2022 |
| Guru Mehar Limited | Transport & logistics | 2024 |
| Guruh Limited | Administrative & support | 2020 |
| GW Environmental & Consulting Ltd | Wholesale & retail | 2019 |
| Gymfit 64 Limited | Arts & recreation | 2025 |
| Gynocare Limited | Administrative & support | 2000 |
| Gyronimo Limited | Education | 2014 |
| H a Properties Limited | Real estate | 2006 |
| H F Singh & Co Limited | Professional & scientific | 2016 |
| H Ward Consulting Services Ltd | Wholesale & retail | 2026 |
| H&O Business Solutions Ltd | Information & communication | 2026 |
| H-Organise Limited | Professional & scientific | 2009 |
| H.A. Mcparland (Chemists) Limited | Wholesale & retail | 1988 |
| H.A.Mcparland Limited | Wholesale & retail | 1970 |
| H.C.S. Carpetcare Holdings Limited | Financial services | 2026 |
| H.C.S. Carpetcare Limited | Other services | 2002 |
| H2 Experience Limited | Professional & scientific | 2005 |
| H2O Plumbing & Heating Services Ltd. | Administrative & support | 1998 |
| H3MG Ltd | Administrative & support | 2020 |
| Habfield Limited | Real estate | 1980 |
| Habiba Medical Company Limited | Health & social care | 2009 |
| Habitat Emporium Ltd | Wholesale & retail | 2024 |
| Habitat UK Design Systems Ltd | Construction | 2012 |
| Habitual Consulting Limited | Information & communication | 2024 |
| Hair Art Lounge Limited | Other services | 2016 |
| Hair Associates (Franchising) Limited | Other services | 2001 |
| Hair Associates (Wood Street) Limited | Other services | 2004 |
| Hair Fashions (Burnham) Limited | Real estate | 1958 |
| Hala (South) Limited | Hospitality | 2007 |
| Hala Health Limited | Arts & recreation | 2020 |
| Hala Limited | Hospitality | 1995 |
| Hala Properties Limited | Real estate | 1997 |
| Hala Star Foods Limited | Hospitality | 2022 |
| Halcyon Industries Limited | Financial services | 2023 |
| Halcyon Property Invest Ltd | Real estate | 2023 |
| Halcyon Property Mgmt Ltd | Real estate | 2023 |
| Hale Estate Berkshire Ltd | Agriculture & fishing | 2024 |
| Halfway Houses Management Limited | Households | 2017 |
| Halo Packaging Ltd | Administrative & support | 2026 |
| Halopath Consultants Ltd | Professional & scientific | 2025 |
| Hamilton Hair Limited | Other services | 2012 |
| Hamilton White Properties Limited | Real estate | 2021 |
| Hampshire Property and Lettings Ltd | Real estate | 2021 |
| Hampton Bradshaw Ltd | Manufacturing | 2019 |
| Hampton Business Solution Ltd | Manufacturing | 2013 |
| Hamptons Property Management Limited | Real estate | 2019 |
| Hands on Learning Limited | Information & communication | 1995 |
| Hanish Advisory Limited | Professional & scientific | 2026 |
| Hannah Hetherington Ltd | Arts & recreation | 2019 |
| Hannah Keen Consulting Ltd | Information & communication | 2025 |
| Hannaways Business Support Limited | Professional & scientific | 2004 |
| Hannington Investments Limited | Administrative & support | 2017 |
| Hanson (BB) Limited | Professional & scientific | 1906 |
| Hanson (BBINO2) Limited | Professional & scientific | 1990 |
| Hanson (CGF) (NO.1) Limited | Financial services | 1989 |
| Hanson (CGF) (NO2) Limited | Professional & scientific | 1989 |
| Hanson (CGF) Finance Limited | Financial services | 1989 |
| Hanson (CGF) Holdings Limited | Financial services | 1989 |
| Hanson (ER - NO 10) Limited | Financial services | 1977 |
| Hanson (ER - NO 5) Limited | Financial services | 1956 |
| Hanson (F) Limited | Professional & scientific | 1989 |