| Growtech Limited | Real estate | 1993 |
| Growth Capital Consulting Ltd | Professional & scientific | 2024 |
| Growthpoint Group Ltd | Financial services | 2017 |
| Growthpoint Properties Ltd | Real estate | 2017 |
| Grumpy Oak Tree Surgeons Limited | Agriculture & fishing | 2022 |
| Grupo Holdings Ltd | Financial services | 2026 |
| Grupo Potencial Ltd | Real estate | 2022 |
| GSK Consulting Limited | Administrative & support | 2026 |
| GTM Brands Ltd | Wholesale & retail | 2025 |
| Gull Properties Limited | Real estate | 1962 |
| GUS Wear Limited | Wholesale & retail | 2024 |
| GUY Fithen Associates Ltd | Professional & scientific | 2015 |
| H H Media Limited | Manufacturing | 2012 |
| H&I Capital Ltd | Extraterritorial | 2025 |
| H&R Decorating Ltd | Construction | 2025 |
| H.A. Fresh Limited | Financial services | 2024 |
| H.M.E Construction Ltd | Construction | 2025 |
| H2O and GAS Limited | Construction | 2015 |
| Haalo Evolution Ltd | Extraterritorial | 2024 |
| Hackness Grange Hotel Limited | Hospitality | 2012 |
| Hackness Grange Properties Limited | Hospitality | 2019 |
| Haffie Limited | Professional & scientific | 2024 |
| Hair by Lory Ltd | Other services | 2024 |
| Hair Gardener MD Ltd | Wholesale & retail | 2015 |
| Hajim Invest Ltd | Other services | 2020 |
| Halcyon 123 Ltd | Professional & scientific | 2012 |
| Halcyon Property UK Limited | Real estate | 2004 |
| Halcyon Residences LLP | | 2012 |
| Halmer Contract Services Ltd | Construction | 2007 |
| Halo X Ltd | Wholesale & retail | 2026 |
| Halsey Electrics Ltd | Construction | 2023 |
| Hamilton & Bailey Ltd | Wholesale & retail | 2024 |
| Hamilton JET (UK) Limited | Manufacturing | 1994 |
| Hamilton Miller Hair Ltd | Other services | 2025 |
| Hamiltons Property Services Ltd | Construction | 2008 |
| Hammersleys Taxis Ltd | Transport & logistics | 2011 |
| Hammerwood Homes Limited | Real estate | 2016 |
| Hammerwood Limited | Construction | 2004 |
| Hampton Estate Property Management Company Limited | Real estate | 2016 |
| Hanson Electrical and Renewables Limited | Manufacturing | 2023 |
| Hapstead House Management Company Limited | Real estate | 2000 |
| Harbruc Controls Limited | Manufacturing | 1999 |
| Hard HAT Projects Ltd | Professional & scientific | 2018 |
| Harmonie Residential Homes Limited | Real estate | 2016 |
| Harrison & Fitzroy Landscape Design Limited | Administrative & support | 2008 |
| Harro Construction Limited | Extraterritorial | 2024 |
| Hartley Wealth Management Limited | Financial services | 2017 |
| Harton Investments Ltd | Real estate | 2021 |
| Hartwood Construction Limited | Construction | 2022 |
| Hartwood Homes (the Apple Farm) Limited | Construction | 2022 |
| Hartwood Homes Limited | Construction | 2022 |
| Harvest Broker Limited | Wholesale & retail | 2024 |
| Harvest Construction Limited | Construction | 2025 |
| Hatchgate Close Management Co. Limited | Extraterritorial | 1999 |
| Haus Rentals Limited | Real estate | 2017 |
| Hawkes Flooring Ltd | Construction | 2024 |
| Hawkesmill Limited | Wholesale & retail | 2015 |
| Hawkeye Construction Ltd | Construction | 2020 |
| Hawkeye Property Holdings Ltd | Real estate | 2021 |
| Hawkeye Sales & Marketing Ltd | Real estate | 2014 |
| Haze Property Services Ltd | Real estate | 2025 |
| HD Design & Build Sussex Ltd | Construction | 2017 |
| HD1 Properties Ltd | Real estate | 2024 |
| Health and Beauty Technology Limited | Wholesale & retail | 2018 |
| Healy Digital Ltd | Arts & recreation | 2026 |
| Heard Social Ltd | Professional & scientific | 2026 |
| Heat in London Ltd | Construction | 2017 |
| Heat Sync Services Ltd | Construction | 2024 |
| Heat-Tek Limited | Construction | 2000 |
| Heath Garden Maintenance Limited | Administrative & support | 2014 |
| Heatherlands 26 Limited | Professional & scientific | 2014 |
| Hedgecourt Field Limited | Households | 1998 |
| Helen Mullany Interiors Limited | Wholesale & retail | 2004 |
| Hello Naturalle Limited | Wholesale & retail | 2015 |
| Help Made Simple Ltd | Administrative & support | 2010 |
| Help Made Simpler Ltd | Health & social care | 2010 |
| Henry Hyde Limited | Information & communication | 2005 |
| Heritage Willservices (Essex) Limited | Other services | 2002 |
| Heritage Wind Ltd | Professional & scientific | 2012 |
| Herold Film Ltd | Professional & scientific | 2021 |
| Heron Windows Limited | Construction | 2002 |
| Herontye Mortgages Ltd | Financial services | 2025 |
| Herontye Properties Ltd | Real estate | 2018 |
| Herwill Limited | Professional & scientific | 2013 |
| Hexa-Box Logistics Ltd | Transport & logistics | 2022 |
| Hexa-Parcel Ltd | Transport & logistics | 2022 |
| Hexesbyhazel Ltd | Wholesale & retail | 2026 |
| Hexon Hill Holding Ltd. | Financial services | 2016 |
| Hexon Investments Ltd | Wholesale & retail | 2012 |
| HGM Decor Ltd | Construction | 2024 |
| HGM Plumbing Ltd | Construction | 2024 |
| Hieover Limited | Households | 1985 |
| High Class Cookers Limited | Hospitality | 2006 |
| Highfield Hall Properties Ltd | Real estate | 2022 |
| Highfield Hall Venue Ltd | Hospitality | 2022 |
| Highgatejonesgroup Limited | Real estate | 2025 |
| Highgrove Precision Engineering Limited | Professional & scientific | 2021 |
| Highley Manor Properties Ltd | Real estate | 2020 |
| Highley Manor Venue Ltd | Hospitality | 2020 |
| Hill House & Gardens Limited | Real estate | 2025 |