| Great Starts Recruitment Ltd | Administrative & support | 2021 |
| Great Success Homes Ltd | Construction | 2023 |
| Green Badge Limited | Administrative & support | 2015 |
| Green Building London Ltd | Professional & scientific | 2014 |
| Green Cars Rental Ltd | Transport & logistics | 2020 |
| Green County Construction Limited | Construction | 2023 |
| Green Gables Sisters Limited | Real estate | 2025 |
| Green Heath Enterprises Ltd | Hospitality | 2025 |
| Green Maya UK Ltd | Manufacturing | 2018 |
| Green Property Sourcing Limited | Real estate | 2024 |
| Green Valley International Ltd | Other services | 2020 |
| Greenacres Boarding Kennels Limited | Administrative & support | 2004 |
| Greenacres Energy Group Ltd | Construction | 2024 |
| Greenacres Essex Ltd | Administrative & support | 2023 |
| Greenlake Builders Limited | Construction | 1995 |
| Greenline Building Solutions Ltd | Construction | 2011 |
| Greentech Consultancy Limited | Professional & scientific | 2025 |
| Greenwood Floors Ltd | Construction | 2024 |
| Greenwood Investments Holding Ltd | Real estate | 2024 |
| Greg&Greg Ltd | Real estate | 2023 |
| Grelew Consultancy Limited | Professional & scientific | 2019 |
| Greycove Holdings Limited | Financial services | 2022 |
| Greycove Limited | Administrative & support | 2017 |
| Greyflame Solutions Limited | Information & communication | 1995 |
| Greymark Ltd. | Professional & scientific | 2020 |
| Greywolf Construction Limited | Construction | 2016 |
| Grime-A-Way Services Limited | Other services | 1997 |
| Grimley Mechanical Pipework Ltd | Construction | 2013 |
| Grind Bromley Ltd | Hospitality | 2024 |
| Grizzly Bear Services Limited | Professional & scientific | 2015 |
| GRO Electrical Limited | Construction | 2024 |
| Groomind Ltd | Other services | 2024 |
| Groovespire Limited | Professional & scientific | 2025 |
| Grossdale Ltd | Health & social care | 2008 |
| Grosvenor Construction Co. (Essex) Limited | Extraterritorial | 1988 |
| Groundwork Coffee Ltd | Manufacturing | 2019 |
| Grove & Dean (Holdings) Limited | Financial services | 2013 |
| Grove & Dean (Property) Limited | Real estate | 2013 |
| Grove & Dean Limited | Financial services | 1974 |
| Grove & Dean Motorsport Limited | Financial services | 2013 |
| Grove Property London Ltd | Real estate | 2019 |
| Grovefield Dental Surgery Limited | Health & social care | 2008 |
| Growpro Biotech Ltd | Agriculture & fishing | 2026 |
| Gryphon PP LLP | | 2020 |
| Gryphon Property Partners Limited | Real estate | 2014 |
| GS Landscaping Ltd | Construction | 2025 |
| GSC Maintenance Limited | Construction | 2026 |
| GSC Property Maintenance Limited | Construction | 2022 |
| GSH Heating Limited | Other services | 2016 |
| GSK Electrical Limited | Construction | 2004 |
| GSM IT Solutions Limited | Information & communication | 2013 |
| Gsmkkm Properties Ltd | Real estate | 2026 |
| GSS Property Holdings Limited | Real estate | 2024 |
| GT Mechanical Services Ltd | Construction | 2019 |
| GTB Freight Ltd | Transport & logistics | 2025 |
| Guardian Express Care Ltd | Real estate | 2025 |
| Guardian Property Development Limited | Real estate | 2022 |
| Guardians Club Ltd | Arts & recreation | 2025 |
| Guardians Studios Ltd | Arts & recreation | 2022 |
| Guchi Jollof Limited | Hospitality | 2019 |
| Guest Book Property Ltd | Real estate | 2022 |
| Guitar Interactive Limited | Professional & scientific | 2002 |
| Gul's Prestige Installations Ltd | Construction | 2007 |
| Guldenpfennig Limited | Health & social care | 2010 |
| Gunning Heating Products Limited | Construction | 2006 |
| GUR S Building Services Limited | Construction | 2023 |
| GUT Services Limited | Other services | 2014 |
| Gvbl Ltd | Administrative & support | 2014 |
| GVK Services Ltd | Administrative & support | 2025 |
| GWC ( London) Limited | Hospitality | 2026 |
| GWR Trades Limited | Wholesale & retail | 2025 |
| H & I Estates Limited | Real estate | 2021 |
| H & S Pharma Ltd | Professional & scientific | 2015 |
| H B Motors Ltd | Wholesale & retail | 2013 |
| H Hoare Limited | Professional & scientific | 2025 |
| H J Flooring Limited | Construction | 2003 |
| H R M Plumbing & Heating Services Ltd | Construction | 2016 |
| H Z Kebab Ltd | Hospitality | 2026 |
| H&M Ferreira Ltd | Health & social care | 2026 |
| H-Line Construction Ltd | Construction | 2016 |
| H.& G.Car Parks Limited | Transport & logistics | 1971 |
| H.S. Van Jaarsveld Limited | Health & social care | 2008 |
| H.T.G 2018 Ltd | Other services | 2021 |
| H2O Contact Services Limited | Administrative & support | 1998 |
| HA Work Tops Ltd | Manufacturing | 2026 |
| Habiqo Limited | Real estate | 2025 |
| Habox Ltd | Health & social care | 2018 |
| Hackney Contract Services Ltd | Construction | 2023 |
| Hackney Road Studios Limited | Information & communication | 2022 |
| Hacton Mall Property Ltd | Real estate | 2021 |
| Hacton Properties Ltd | Real estate | 2023 |
| HAF Investments Limited | Administrative & support | 2022 |
| HAI Hausu Limited | Professional & scientific | 2023 |
| Hair @ Lounge 27 Ltd | Other services | 2025 |
| Hair by Catherine Limited | Other services | 2019 |
| Hair by Ella Ltd | Other services | 2020 |
| Hair HUT Salon Ltd | Other services | 2024 |
| HAIRCUTS4HOMELESS Limited | Health & social care | 2018 |
| Halit Dervis Limited | Health & social care | 2024 |
| Halls Interiors Limited | Construction | 2012 |