| Greenheart Energy Limited | Construction | 2005 |
| Greenheart Energy MWI Limited | Energy | 2019 |
| Greenheart Power Africa Limited | Energy | 2014 |
| Greg Power Will Writers Limited | Professional & scientific | 2013 |
| Greys Cottage Ltd | Hospitality | 2015 |
| Greywalls Accountants Limited | Professional & scientific | 2007 |
| Greywalls Consultancy Limited | Administrative & support | 2017 |
| GRIME2SHINEKLEENING Limited | Administrative & support | 2021 |
| Grip Tyres Limited | Wholesale & retail | 2012 |
| Grosvenor House Practice Limited | Professional & scientific | 2002 |
| Groundstone Construction Limited | Manufacturing | 2024 |
| Group Nineteen Ltd | Professional & scientific | 2020 |
| Grow-Crop Advice Ltd | Agriculture & fishing | 2022 |
| Growth Mindset Tutoring Limited | Education | 2022 |
| Gruffles Limited | Manufacturing | 2023 |
| Gryde Ltd | Manufacturing | 2019 |
| GT Supply Chain Consulting Ltd | Professional & scientific | 2023 |
| Guardian Site and Event Security Ltd | Administrative & support | 2025 |
| Guitar Circus Ltd. | Education | 2006 |
| Gunn Consultancy Ltd | Professional & scientific | 2025 |
| Gurnham Consulting Limited | Professional & scientific | 2008 |
| Guru RAM DAS Project | Health & social care | 2003 |
| GVH Investments Ltd | Real estate | 2024 |
| Gwas Ambulance Group Ltd | Financial services | 2024 |
| Gwbm Ltd | Wholesale & retail | 2012 |
| Gwrych Properties Limited | Financial services | 1959 |
| Gwynnespeed Ltd | Arts & recreation | 2016 |
| GX Cirencester Ltd | Hospitality | 2018 |
| H & H Developments Ltd | Construction | 2010 |
| H & H Relish Ltd | Hospitality | 2010 |
| H Bay Limited | Administrative & support | 2025 |
| H Franklin Machinery Ltd | Wholesale & retail | 2024 |
| H.J. Herbert (Electrical Engineers) Limited | Construction | 1974 |
| H.S.B.S. Investments Limited | Professional & scientific | 2015 |
| Habitat Escapes Limited | Hospitality | 2008 |
| Habitat First Group Limited | Financial services | 2012 |
| Habitat+ Architects Ltd | Professional & scientific | 2022 |
| Hacked Ltd. | Information & communication | 2012 |
| Haden Consultancy Limited | Professional & scientific | 2018 |
| Hagas (Home & Garden) Supplies Limited | Real estate | 1970 |
| Hailes Street Limited | Real estate | 2022 |
| Hair Gripz Ltd | Wholesale & retail | 2025 |
| Hamer Maintenance Limited | Manufacturing | 2025 |
| Hampton Pet Services Limited | Extraterritorial | 2023 |
| Hangloose @ Eden Ltd | Arts & recreation | 2014 |
| Hangloose Adventure Limited | Arts & recreation | 2014 |
| Hangloose London Limited | Arts & recreation | 2019 |
| Hanlouboo Ltd | Manufacturing | 2025 |
| Hanstone Court Management Company (NO 3) Limited | Households | 1989 |
| Harbord Ventures Ltd | Hospitality | 2021 |
| Harcourt Gardens Limited | Administrative & support | 2026 |
| Harding Recruitment Ltd | Other services | 2025 |
| Harley Installations Ltd | Construction | 2015 |
| Harley Interiors Ltd. | Manufacturing | 2020 |
| Harper Castle Limited | Professional & scientific | 2014 |
| Harper-Lee Developments Ltd | Construction | 2026 |
| Harpoon Marketing and Design Solutions Limited | Information & communication | 2000 |
| Harpoon TV Limited | Information & communication | 2011 |
| Harrison Walker Music Ltd | Information & communication | 2025 |
| Hartham Properties Limited | Real estate | 2020 |
| Harvest Foods Limited | Administrative & support | 1997 |
| Harvey Moon Limited | Construction | 2002 |
| Hassle Free Limited | Construction | 2003 |
| Hassle Free Weekends Ltd | Hospitality | 2008 |
| Hasta LA Visa, Baby Limited | Arts & recreation | 2019 |
| Hats OFF Tutoring Ltd | Education | 2025 |
| Haus Construction Ltd | Construction | 2025 |
| Haus Ltd | Construction | 2024 |
| Haute Works Ltd | Transport & logistics | 2025 |
| Haydon Group Limited | Real estate | 2025 |
| Haydon Pre-Schools Limited | Education | 2023 |
| Haynes EDE LLP | | 2019 |
| Hayward & Associates Limited | Administrative & support | 2000 |
| Hayward House Management Company Limited | Real estate | 2003 |
| Hbans Ltd | Administrative & support | 2014 |
| HCO 2026 I LP | | 2026 |
| Headvet Locum Services Limited | Professional & scientific | 2021 |
| Health Track Limited | Administrative & support | 1999 |
| Heart of the Garden Ltd | Professional & scientific | 2002 |
| Heart Safe Consultancy & Training Ltd. | Administrative & support | 2013 |
| Heaven on Earth Music Limited | Arts & recreation | 1977 |
| Helen Milne Productions Ltd | Arts & recreation | 2017 |
| Helios Fabrications Limited | Manufacturing | 1978 |
| Helipro Ltd | Manufacturing | 2015 |
| Helitrain Limited | Education | 2003 |
| Hello Rock Studios Limited | Information & communication | 2025 |
| Helpful Hands Services Ltd | Administrative & support | 2019 |
| Helping Old Friends Franchise Services Ltd | Administrative & support | 2025 |
| Hemlock Studio Ltd | Arts & recreation | 2024 |
| Hennessy Construction Ltd | Professional & scientific | 2014 |
| Henrietta's Home From Home Ltd | Other services | 2022 |
| Henry's Animal Feeds Limited | Wholesale & retail | 2010 |
| Henrys Feeds Limited | Wholesale & retail | 2010 |
| Hera Executives Ltd | Professional & scientific | 2026 |
| Hercules (Training) Ltd | Education | 2023 |
| Hercules (White Collar) Ltd | Administrative & support | 2010 |
| Hercules PLC | Construction | 2008 |
| Hercules Real Estate Limited | Real estate | 2016 |
| Hercules Subsidiary Ltd | Construction | 2024 |
| Heritage Building and Property Maintenance Limited | Construction | 2023 |