| Griffco Properties Limited | Real estate | 2014 |
| Grilled UP Ltd | Hospitality | 2018 |
| Grip Technologies Limited | Information & communication | 2007 |
| GRN Estates (RES) Ltd | Real estate | 2025 |
| GRN Finance & Invest Ltd | Administrative & support | 2019 |
| GRO Chem Limited | Wholesale & retail | 2020 |
| Grona Ltd | Information & communication | 2025 |
| Grosvenor Staffing Limited | Administrative & support | 2010 |
| Ground Construction (Barnes) Ltd | Construction | 2014 |
| Groundserv Limited | Wholesale & retail | 2024 |
| Grove Court (Sutton) Freehold Limited | Households | 2025 |
| Grove Services (UK) Limited | Other services | 1991 |
| Grove Terrace Management Company Limited | Households | 2002 |
| Grover-Das Properties Limited | Real estate | 2021 |
| Grow Higher Coaching Ltd | Administrative & support | 2024 |
| GS Building Services 2 Ltd | Construction | 2015 |
| GS Futures Ltd | Information & communication | 2026 |
| GS91 Limited | Construction | 2019 |
| GSA Services (South East) Ltd | Construction | 2011 |
| GSK Facilities Ltd | Construction | 2022 |
| Gson Techno Ltd | Information & communication | 2017 |
| Gssops Limited | Information & communication | 2020 |
| GT Powertrain Technologies Ltd | Manufacturing | 2022 |
| GT Pro Trades Ltd | Construction | 2022 |
| Gtaac Ltd | Wholesale & retail | 2011 |
| Gtax Accounting Services Limited | Professional & scientific | 2006 |
| Gtech Solutions Ltd | Information & communication | 2019 |
| GTS Alive Limited | Financial services | 2019 |
| Guadeloupe Limited | Professional & scientific | 2016 |
| Guardian Damp Proofing Ltd | Other services | 2017 |
| Guardians Security Ltd | Administrative & support | 2021 |
| Guilbert UK Pension Trustees Limited | Financial services | 1993 |
| GUR Estate Ltd | Real estate | 2025 |
| Gurhy Investments Ltd | Real estate | 2020 |
| Gurkha Workforces Ltd | Administrative & support | 2026 |
| Guruguru Patisserie Ltd | Manufacturing | 2024 |
| Guzella Ltd | Wholesale & retail | 2025 |
| GV Computing Limited | Information & communication | 2025 |
| GV Property Sourcing Ltd | Real estate | 2025 |
| Gvse Ltd | Construction | 2016 |
| GW Global Projects Limited | Information & communication | 2001 |
| GWB Estates Limited | Real estate | 2024 |
| GWC Building Contractors Limited | Construction | 2010 |
| GWC Pubs Ltd | Hospitality | 2019 |
| Gym Beast Sutton Ltd | Wholesale & retail | 2026 |
| Gym House Health Limited | Arts & recreation | 2020 |
| Gymkidz Limited | Education | 2012 |
| Gymnasium FIX Limited | Arts & recreation | 2019 |
| Gymrat Inc Ltd | Wholesale & retail | 2022 |
| GZL Jewellery Ltd | Wholesale & retail | 2026 |
| H & a Construction Ltd | Construction | 2019 |
| H & J Consulting Ltd | Administrative & support | 2019 |
| H & T Group Limited | Financial services | 2004 |
| H P Gibson and Sons Limited | Manufacturing | 2021 |
| H&A Media Group Limited | Manufacturing | 2022 |
| H&S BIZ Associates Limited | Professional & scientific | 2011 |
| H.Alisons Limited | Real estate | 2008 |
| H.D UK Real Estate Ltd | Real estate | 2024 |
| H.E. Long Fitters Ltd | Construction | 2018 |
| H.Farahani Limited | Transport & logistics | 2019 |
| H.Turnbull & Co.Limited | Construction | 1964 |
| H2AR Ltd | Real estate | 2019 |
| H2AR2 Ltd | Real estate | 2023 |
| H2AR3 Ltd | Real estate | 2025 |
| H2O Plumbing & Design Ltd | Construction | 2007 |
| Haddon Electrical Limited | Construction | 2003 |
| Hagans Homes Ltd | Real estate | 2023 |
| Hagshift Limited | Extraterritorial | 2016 |
| Hailwood Place Management Company Limited | Households | 2019 |
| Haines of Sloane Square Limited | Wholesale & retail | 1998 |
| Hainsworth Property Investments Ltd | Real estate | 2026 |
| Hair at Fifty Seven Ltd | Other services | 2019 |
| Hair by Annie Limited | Other services | 2017 |
| Hair Cult Limited | Other services | 2017 |
| Haither Limited | Professional & scientific | 2025 |
| Haks Property Ltd | Real estate | 2022 |
| Hale and Wyeth Construction Ltd | Construction | 2019 |
| Halebridge London Limited | Administrative & support | 2018 |
| Hallegan (SE) Ltd | Professional & scientific | 2015 |
| Hallgate Farm Foods Limited | Wholesale & retail | 2011 |
| Halo Electrics Ltd | Construction | 2019 |
| Halo Lighting Services Ltd | Construction | 2023 |
| Halo Sales Management Limited | Professional & scientific | 2022 |
| Halo Skin Ltd | Wholesale & retail | 2026 |
| Hambalt Consulting Limited | Professional & scientific | 2017 |
| Hamer Consulting Limited | Professional & scientific | 1996 |
| Hamewith Analytics Limited | Information & communication | 2019 |
| Hampton Conservatories (South) Limited | Construction | 2005 |
| Hand in Gauntlet Productions Ltd | Information & communication | 2013 |
| Handmade by ZEN Ltd | Professional & scientific | 2024 |
| Hang KEE Ltd | Construction | 2022 |
| Hanl Enterprise Ltd | Hospitality | 2013 |
| Hannah Coates Consulting Limited | Professional & scientific | 2025 |
| Hannah Williams Limited | Health & social care | 2016 |
| Hanoli Properties Limited | Real estate | 2024 |
| Hanover Close Residents Company Limited | Households | 1981 |
| Happily Ever Digital Ltd | Information & communication | 2018 |
| Happsy Limited | Administrative & support | 2023 |
| Happy Building London Limited | Construction | 2012 |
| Happy Donkey Tours Limited | Administrative & support | 2013 |