| Greentree Accounting Limited | Professional & scientific | 2023 |
| Greentree Estates (K&D) Limited | Real estate | 2025 |
| Greentree Financial Services Limited | Financial services | 2022 |
| Greenzyme Limited | Professional & scientific | 2025 |
| Gremivio Ltd | Construction | 2018 |
| Grey Horse Films Ltd | Information & communication | 2022 |
| Griffon Services Limited | Construction | 2017 |
| Groomingtails Dogdaycare Ltd | Agriculture & fishing | 2026 |
| Grootbuy Ltd | Wholesale & retail | 2024 |
| Grosvenor Business Consulting Limited | Information & communication | 2022 |
| Group SKG Ltd | Real estate | 2022 |
| Grove Cooling Services Ltd | Construction | 2007 |
| Grow & Shine Limited | Real estate | 2019 |
| Growth Bloc Limited | Professional & scientific | 2024 |
| GS Business & Consultancy Ltd | Professional & scientific | 2025 |
| GS Electrical & AV Limited | Construction | 2016 |
| GSM Contractors Ltd | Construction | 2019 |
| Guided Progression Ltd | Professional & scientific | 2019 |
| Gulzars Group Ltd | Hospitality | 2025 |
| Gunning Road Thurrock Limited | Real estate | 2013 |
| Guru Sales London Ltd | Wholesale & retail | 2017 |
| GV12 Property Investments Ltd | Real estate | 2026 |
| GW Rigging Ltd | Construction | 2024 |
| GZ Construction Ltd | Construction | 2018 |
| H & L Consultancy Ltd | Professional & scientific | 2022 |
| H and H Glamour Ltd | Wholesale & retail | 2022 |
| H J Pinkerton Ltd | Financial services | 2024 |
| H Jones Contract Services Limited | Professional & scientific | 2019 |
| H Properties UK1 Ltd | Real estate | 2024 |
| H Squared Construction Ltd | Construction | 2020 |
| H Squared Property Development Limited | Construction | 2025 |
| H&L Scaffolding Solutions Ltd | Construction | 2025 |
| H.A.R.P Scaffolding Ltd | Construction | 2017 |
| H2O DRY Cleaners & Laundry Ltd | Other services | 2022 |
| Hackbridge Barber's Ltd | Other services | 2021 |
| Hackbridge Beauty Ltd | Other services | 2026 |
| Hackbridge Cafe Ltd | Hospitality | 2014 |
| Hackbridge Food and Wine Limited | Wholesale & retail | 2021 |
| Hackbridge Nails & Beauty Ltd | Other services | 2023 |
| Hackshaw Plumbing & Heating Limited | Construction | 2007 |
| Haddeo Ltd | Construction | 2015 |
| Hailwood Homes Limited | Real estate | 2019 |
| Hajar Properties Ltd | Real estate | 2024 |
| Hammer Ventures Ltd | Real estate | 2026 |
| Hampshire House Group Ltd | Hospitality | 2007 |
| Handleys Holding Ltd | Professional & scientific | 2023 |
| Hands on Agency Limited | Administrative & support | 2020 |
| Hapington Limited | Other services | 2020 |
| Happy Glaze Ceramics Limited | Wholesale & retail | 2018 |
| Happyappliances Ltd | Wholesale & retail | 2018 |
| Hari Consultants Ltd | Professional & scientific | 2018 |
| Hariom Enterprise Ltd | Hospitality | 2025 |
| Hariram Annam Limited | Hospitality | 2020 |
| Harkin and Toth Casting Limited | Information & communication | 2013 |
| Harrington Builders Limited | Construction | 2008 |
| Harrow Lodge (Sutton) Managements Limited | Households | 1972 |
| Harthevy Limited | Real estate | 2025 |
| Hartwell Auctions Ltd | Wholesale & retail | 2026 |
| Hatch Production Holding Co. Ltd | Professional & scientific | 2024 |
| Hatch Production Ltd | Professional & scientific | 2019 |
| Haul & Store Limited | Transport & logistics | 2015 |
| Haus of Health & Aesthetics Limited | Health & social care | 2022 |
| Havemore Limited | Wholesale & retail | 2023 |
| Hayes Creative Solutions Ltd | Information & communication | 2025 |
| Hayllar Estates Limited | Administrative & support | 2019 |
| HBX Enterprises Limited | Wholesale & retail | 2025 |
| HD Ready Production Management Ltd | Administrative & support | 2018 |
| Healing Hands Thai Spa Ltd | Health & social care | 2020 |
| Health Issues Ltd. | Wholesale & retail | 2002 |
| Healthcare Assoc Limited | Administrative & support | 2023 |
| Healthy Food Outlets Limited | Hospitality | 2025 |
| Healy Roofing & Leadwork Ltd | Construction | 2025 |
| Hearsum and Company Limited | Professional & scientific | 2025 |
| Heath Books Ltd | Wholesale & retail | 2010 |
| Heating Geeks Limited | Manufacturing | 2017 |
| Heatman Ltd | Construction | 2017 |
| Heavy Duty Designs Limited | Wholesale & retail | 2004 |
| Helen Damree Cook Ltd | Administrative & support | 2023 |
| Hello Signal UK Limited | Wholesale & retail | 2024 |
| Hemkishi Ltd | Wholesale & retail | 2017 |
| Henry Wealth Management Ltd | Financial services | 2019 |
| Heraclitus Global Ltd | Information & communication | 2012 |
| Heritage Brickwork Limited | Construction | 1996 |
| Heritage Property Agents Limited | Real estate | 2024 |
| Heron Consulting Group Limited | Professional & scientific | 2022 |
| Heyharper Shop UK Ltd | Wholesale & retail | 2023 |
| Heyluna Ltd | Administrative & support | 2022 |
| HFC Construction Consultancy Ltd | Professional & scientific | 2025 |
| Hfer Transport Limited | Transport & logistics | 2015 |
| HFF Management Ltd | Households | 1998 |
| HHD Properties Ltd | Real estate | 2019 |
| Hibou Health Consulting Limited | Professional & scientific | 2017 |
| Hickey Developments Limited | Professional & scientific | 1995 |
| Hickey Group Limited | Financial services | 2016 |
| Hightz Limited | Other services | 2021 |
| Hill Finishes Ltd | Construction | 2017 |
| Hillcroft Conversions Ltd | Construction | 2018 |
| Hills Store Limited | Wholesale & retail | 2025 |
| Hilton & SON Holding Limited | Wholesale & retail | 2023 |
| Himura Kenshin Limited | Real estate | 2020 |