| Gursees Ariyana Limited | Real estate | 2025 |
| Guru Josan Construction Ltd | Construction | 2023 |
| Guru Kirpa Food Store Limited | Wholesale & retail | 2023 |
| Gurugraphics Limited | Information & communication | 2012 |
| Gutchu Ltd | Arts & recreation | 2020 |
| GUY Cohen Consultancy Limited | Administrative & support | 2019 |
| GUY Payne of London Limited | Transport & logistics | 1986 |
| Guzhen Ltd | Financial services | 2024 |
| GUZHEN2 Ltd | Financial services | 2024 |
| Guzzling Ltd | Hospitality | 2020 |
| GV Vamtech (UK) Ltd | Professional & scientific | 2026 |
| Gvclite Limited | Hospitality | 2024 |
| GVL International (UK) Limited | Financial services | 2022 |
| GW Air Conditioning Limited | Administrative & support | 2001 |
| GW Creation Ltd | Information & communication | 2025 |
| GW Global UK Limited | Wholesale & retail | 2025 |
| Gwendolen Avenue Management Company Limited | Households | 2003 |
| Gwenu Properties Limited | Construction | 2026 |
| GWP Associates Limited | Real estate | 2003 |
| Gwsa Teaching Ltd | Education | 2025 |
| GWV Associates Limited | Administrative & support | 2013 |
| GX Overseas Limited | Wholesale & retail | 2014 |
| Gxfc Ltd | Wholesale & retail | 2026 |
| Gyapliz Healthcare Ltd | Health & social care | 2025 |
| GYE Nyame Development Foundation | Transport & logistics | 2019 |
| Gym Beast Limited | Wholesale & retail | 2017 |
| Gym Emporium Ltd | Wholesale & retail | 2023 |
| Gym Kids Fitness Ltd | Education | 2026 |
| Gymnetics Fit Ltd | Wholesale & retail | 2025 |
| Gynaecare Health Innovation Limited | Health & social care | 2025 |
| Gynaefocus Ltd | Health & social care | 2011 |
| H & a Design Limited | Construction | 2025 |
| H & B Vashani Limited | Wholesale & retail | 2017 |
| H & H (Albadar) Limited | Wholesale & retail | 2013 |
| H & H Convenience Limited | Wholesale & retail | 2017 |
| H & H Global London Limited | Professional & scientific | 2018 |
| H & M Consultants Limited | Professional & scientific | 2025 |
| H & M Meats Limited | Manufacturing | 2000 |
| H & S Driving Services Ltd | Health & social care | 2020 |
| H and V Ltd | Construction | 2009 |
| H B Design and Construction Limited | Wholesale & retail | 2008 |
| H D & Investment Ltd | Real estate | 2018 |
| H D Pharmacy Ltd | Wholesale & retail | 2019 |
| H D Shop Ltd | Wholesale & retail | 2022 |
| H K R One Stop Limited | Wholesale & retail | 2025 |
| H M Newsmart Ltd | Wholesale & retail | 2012 |
| H Mobile & Vapes Limited | Wholesale & retail | 2018 |
| H R Rigging Ltd | Construction | 2019 |
| H Rigging Services Ltd | Information & communication | 2019 |
| H S Gents Grooming Ltd | Other services | 2023 |
| H Sams Ltd. | Administrative & support | 2017 |
| H SRI Kitchen Limited | Hospitality | 2025 |
| H&B Facilities Consultants Ltd | Administrative & support | 2026 |
| H&H Global Ventures Ltd | Wholesale & retail | 2025 |
| H&I Prime Properties Limited | Construction | 2026 |
| H&M Carpet and Flooring Services Limited | Construction | 2026 |
| H&M Gordon Limited | Wholesale & retail | 2018 |
| H&S 1994 Ltd | Transport & logistics | 2020 |
| H&S Building Ltd | Construction | 2018 |
| H&T Landscaping Ltd | Construction | 2024 |
| H&W Property Group Ltd | Construction | 2025 |
| H-E Secretaries Limited | Extraterritorial | 2009 |
| H-Serf Ltd | Professional & scientific | 2001 |
| H. a. Lyken & Sons | Education | 2019 |
| H.A.N.D Human Rights Ltd | Professional & scientific | 2025 |
| H.Babanie Ltd | Wholesale & retail | 2023 |
| H.G. Palmer Limited | Administrative & support | 1958 |
| H.O.B (House of Bread) CIC | Hospitality | 2023 |
| H.R. Management Company Limited | Households | 1988 |
| H.Solanki Limited | Wholesale & retail | 2018 |
| H010 Limited | Professional & scientific | 2016 |
| H1 Touch Limited | Extraterritorial | 2016 |
| H20 Property Services Limited | Real estate | 2020 |
| H2H Real Estate Limited | Real estate | 2007 |
| H2O Appliances Limited | Wholesale & retail | 2011 |
| H2R Enterprises Ltd | Real estate | 2017 |
| H2R Holdings Limited | Professional & scientific | 2012 |
| Habib Global Ltd | Wholesale & retail | 2025 |
| Habitatia Ltd | Real estate | 2023 |
| Habot Limited | Health & social care | 2014 |
| HAC UK Limited | Manufacturing | 2000 |
| Hachi London Limited | Construction | 2022 |
| Hachi Notting Hill Ltd | Hospitality | 2014 |
| Hackett Flooring Services Ltd | Construction | 2022 |
| Haddenham Management Company Limited | Households | 2022 |
| Hadgate Limited | Real estate | 1963 |
| Hadi's Barbers Ltd | Other services | 2018 |
| Hadile Quantum Leap Group Ltd | Professional & scientific | 2025 |
| Hadrin Services Ltd | Administrative & support | 2026 |
| Hafuzi Construction Ltd | Construction | 2016 |
| Hagleys Career Services Limited | Administrative & support | 2017 |
| Hagleys Group Limited | Administrative & support | 2016 |
| Haicharles Ltd | Public administration | 2021 |
| Haigh Park View Management Company Limited | Households | 2006 |
| Haihong Kitchen Equipments Ltd | Wholesale & retail | 2018 |
| Haiphong Media Ltd | Professional & scientific | 2021 |
| Hair (Cambridge) Limited | Other services | 2015 |
| Hair (Chichester) Ltd | Other services | 2009 |
| Hair (Ealing) Limited | Other services | 2009 |
| Hair (East Grinstead) Limited | Other services | 2016 |