| Good Karma Properties Limited | Real estate | 2017 |
| Good Key Shop Ltd | Wholesale & retail | 2025 |
| Good News Agency Limited | Arts & recreation | 2024 |
| Goods and Services Development Ltd | Professional & scientific | 2026 |
| Goodwill Builds Limited | Construction | 2026 |
| Goodwill Living Limited | Real estate | 2003 |
| Goody Stuff Ltd | Wholesale & retail | 2025 |
| Gosat Eafrica Telecommunications UK Ltd | Information & communication | 2017 |
| Gospel Sports Group Limited | Arts & recreation | 2024 |
| Govand Ella Barbers Ltd | Wholesale & retail | 2025 |
| Govand Kurdish Barbers Ltd | Wholesale & retail | 2023 |
| Graci Services Ltd | Construction | 2004 |
| Graeme Rowe Consultancy and Investments Ltd | Professional & scientific | 2023 |
| Graham Drew Design Services Limited | Professional & scientific | 1977 |
| Grange Legal Limited | Professional & scientific | 2023 |
| Graphite Pixels Limited | Information & communication | 2021 |
| Grays Housing Management Limited | Real estate | 2023 |
| Great Music Only Limited | Information & communication | 2017 |
| Green & Co. (Oxford) Limited | Real estate | 2014 |
| Green Book Limited | Other services | 2023 |
| Green Scythe Ltd. | Administrative & support | 2008 |
| Greenall Investment Ltd | Real estate | 2022 |
| Greengage Homes Ltd | Construction | 2017 |
| Greenius Limited | Information & communication | 2001 |
| Greenranger Ltd | Real estate | 2019 |
| Greenredeem Ltd | Professional & scientific | 2009 |
| Greenspire Consulting Ltd | Information & communication | 2015 |
| Grey Wolf Therapeutics Limited | Professional & scientific | 2017 |
| Greyfriars Snack Foods | | 1991 |
| Griffon International Limited | Arts & recreation | 2003 |
| Griffon International Publishing Limited | Information & communication | 2000 |
| Grim Dark C.I.C. | Arts & recreation | 2024 |
| Griphindaw Ltd | Arts & recreation | 2021 |
| Ground Investigation Services (Southern) Ltd | Professional & scientific | 2013 |
| Grovefarm Buildings Ltd | Real estate | 2017 |
| GRV ST Ltd | Arts & recreation | 2023 |
| Gtech PAY Ltd | Wholesale & retail | 2026 |
| Gtmac Ltd | Extraterritorial | 2012 |
| Guardian Alliance Security Ltd | Administrative & support | 2025 |
| Gunn Records UK Ltd | Information & communication | 2020 |
| Guoshun Trading Co., Ltd | Wholesale & retail | 2025 |
| Gurusamy Goldsmiths UK Ltd | Wholesale & retail | 2026 |
| GUS Bowers Racing Ltd | Arts & recreation | 2018 |
| GW ERP Solutions Limited | Information & communication | 2023 |
| GWD Fitness Limited | Arts & recreation | 2012 |
| Gylden Pharma Limited | Professional & scientific | 2016 |
| H & K Property Investment Limited | Real estate | 2016 |
| H and L Decorating Contractors Limited | Construction | 2015 |
| H.Tuckwell & Sons Limited | Mining & quarrying | 1922 |
| H4 Investment Ltd | Real estate | 2020 |
| Hakcare Ltd | Health & social care | 2021 |
| Halcyon HR Consulting Limited | Administrative & support | 2015 |
| Hall & Co Construction Holdings Limited | Financial services | 2020 |
| Hall & Co Construction Limited | Construction | 2016 |
| Hallettec Ltd | Wholesale & retail | 2020 |
| Halstead Walker Limited | Real estate | 2025 |
| Hambleden Land Limited | Real estate | 2022 |
| Hammond 1970 Limited | Extraterritorial | 2013 |
| Hamsard 3145 Limited | Financial services | 2008 |
| Hamsard 3814 Limited | Financial services | 2025 |
| Hamshik Demiurge Solutions PVT Ltd | Information & communication | 2022 |
| Hansheng Ltd | Professional & scientific | 2008 |
| HAO Design Studio Ltd | Professional & scientific | 2021 |
| Happy Little Hamper Limited | Wholesale & retail | 2024 |
| Happygeneralist Ltd | Information & communication | 2021 |
| Harbour Beats Limited | Arts & recreation | 2019 |
| Harley-Davidson Europe Limited | Wholesale & retail | 1989 |
| Harley-Davidson Financial Services Europe Limited | Financial services | 2002 |
| Harold Grant Limited | Construction | 2019 |
| Harry Davies Jockey Ltd | Arts & recreation | 2026 |
| Hartley-James Holdings Ltd | Financial services | 2026 |
| Harty Homes Ltd | Construction | 2019 |
| Harwood Claims Management Limited | Administrative & support | 2012 |
| Havards Limited | Extraterritorial | 2000 |
| Hawkwood International Ltd | Information & communication | 2018 |
| Hayward Fire Solutions Limited | Public administration | 2025 |
| Hayward Timber Solutions Limited | Wholesale & retail | 2019 |
| HB Property Enterprises Limited | Extraterritorial | 2012 |
| HC Consulting Services Ltd | Information & communication | 2019 |
| HDR Property Enterprise Ltd | Real estate | 2025 |
| HDS Autos Limited | Wholesale & retail | 2016 |
| HE Sentinel Consulting Ltd | Professional & scientific | 2026 |
| Headline Media UK Training and Consultancy Ltd | Education | 2013 |
| Headstart Early Learning Ltd | Health & social care | 2021 |
| Healthcare Ally Ltd | Professional & scientific | 2025 |
| Healthier Systems Ltd | Professional & scientific | 2020 |
| Heelas Plumbing Services Ltd | Manufacturing | 2004 |
| Hegenberger Medical Limited | Manufacturing | 2021 |
| Heightened Sounds Ltd | Professional & scientific | 2025 |
| Helda Property Limited | Real estate | 2014 |
| Helix Technologies Limited | Manufacturing | 2017 |
| HELIX6 Ltd | Information & communication | 2018 |
| Hellorainbow Ltd | Wholesale & retail | 2026 |
| HEM Green Ltd | Administrative & support | 2015 |
| Hemarti Holdings Ltd | Real estate | 2023 |
| Henderson Health Ltd | Health & social care | 2025 |
| Hengxing Technology Ltd | Wholesale & retail | 2023 |
| Henley Vets Limited | Professional & scientific | 2011 |
| Henry Cole & Company Limited | Wholesale & retail | 1896 |
| Herabe Ltd | Manufacturing | 2015 |