| Garner Court Management Limited | Households | 1985 |
| Garusa Solutions U.K. Limited | Wholesale & retail | 2017 |
| Gary Jones Electrical Installation & Management Limited | Professional & scientific | 2019 |
| Gate Delicatessen Limited | Wholesale & retail | 2003 |
| Gathercrest Limited | Manufacturing | 2009 |
| Gathercrest Properties Holdings Limited | Financial services | 2014 |
| Gathercrest Properties Limited | Real estate | 2013 |
| GB Rope Access Techs Ltd | Construction | 2023 |
| Gd&P Construction Services Ltd | Construction | 2009 |
| GDK Developments Limited | Construction | 2025 |
| GDP Global Limited | Real estate | 2019 |
| GDP Renovations Ltd | Real estate | 2022 |
| Gemsville Healthcare Community Ltd | Health & social care | 2025 |
| Generational Wealth Management (IFA) Ltd | Financial services | 2019 |
| Genum Ltd | Professional & scientific | 2025 |
| GEO Grand Ltd | Construction | 2024 |
| George S.Clayton Limited | | 1958 |
| Georgehenry Heating Limited | Construction | 2011 |
| Georgie Porgie Limited | Education | 2000 |
| Germain Wealth Management Limited | Professional & scientific | 2008 |
| GET UP Studio Limited | Administrative & support | 2025 |
| Gettinghealth Limited | Public administration | 2019 |
| GFS Associates Ltd | Information & communication | 2014 |
| GH Brickwork Solutions Ltd | Construction | 2025 |
| Giannam Holdings Ltd | Financial services | 2024 |
| Giga Builders Ltd | Construction | 2026 |
| Gill Territory Limited | Health & social care | 2022 |
| Gine Limited | Wholesale & retail | 2023 |
| Ginn Property Investments Limited | Real estate | 2015 |
| GJ Performance Limited | Professional & scientific | 2024 |
| GJ Solutions Ltd | Transport & logistics | 2022 |
| GJB Total Solutions Limited | Professional & scientific | 2016 |
| GK (Bexley) Ltd | Administrative & support | 2016 |
| Glam London Limited | Extraterritorial | 2016 |
| GLC Homes Ltd | Real estate | 2020 |
| Glendale Properties Limited | Real estate | 1995 |
| Glnow Limited | Information & communication | 2001 |
| Global Art & Talent Portal Ltd | Information & communication | 2025 |
| Global Explorers Limited | Administrative & support | 2001 |
| Global Research Centre for Accounting ,Finance and Investment Management (Grcafim) Ltd | Education | 2023 |
| Global-Golf-Links Limited | Arts & recreation | 2012 |
| Globetec Engineering Services Limited | Administrative & support | 2006 |
| GNF Partners Limited | Wholesale & retail | 2021 |
| Go Building Ltd | Construction | 2024 |
| Goal Getter Coach Ltd | Professional & scientific | 2023 |
| Godswon Holding Co. Ltd | Financial services | 2025 |
| Gold Run Property Ltd | Households | 2025 |
| Golden GEM Properties Ltd | Real estate | 2026 |
| Goldhawk Forms Limited | Manufacturing | 1995 |
| Gomes Photography Limited | Professional & scientific | 2012 |
| Good Dwellings Limited | Real estate | 2023 |
| Good Etiquette & Manners Ltd | Education | 2026 |
| Good Life Ventures Limited | Professional & scientific | 2015 |
| Goodeforlife Ltd | Real estate | 2022 |
| Goodnight & Associates Ltd | Real estate | 2019 |
| Goodview Kennels Limited | Hospitality | 2003 |
| Goodwin Inns Ltd | Hospitality | 2023 |
| Gould Engineering Limited | Manufacturing | 2017 |
| Gould Investments Ltd | Real estate | 2025 |
| GP Fastlane Motors Limited | Wholesale & retail | 2013 |
| GR Project Services Ltd | Construction | 2025 |
| Grace Given Healthcare Services Ltd | Health & social care | 2025 |
| Graham Gill UK LLP | | 2009 |
| Graley Family Investments Limited | Real estate | 2014 |
| Grant Computer Training Limited | Administrative & support | 2003 |
| Grant Stanley Consulting Limited | Administrative & support | 2019 |
| Gravesend Independent Living Services Limited | Health & social care | 2021 |
| Graydon Communications Limited | Other services | 2018 |
| Great Deals NOW Ltd | Wholesale & retail | 2017 |
| Great Story Team Limited | Professional & scientific | 2001 |
| Green Air Monitoring Limited | Professional & scientific | 1999 |
| Green Focus Ltd | Real estate | 2022 |
| Green Olive Developments Ltd | Real estate | 2025 |
| Greenacres and Carlton Green Residents Association(Sidcup)Limited | Households | 1971 |
| Greenhithe Transport Ltd | Transport & logistics | 2025 |
| Greenlays Consultancy Group Ltd | Administrative & support | 2018 |
| Greenwich Beauty Limited | Other services | 2024 |
| Grennan Consultants Limited | Financial services | 2017 |
| Greycot Press Limited | Manufacturing | 2016 |
| Griffon Specialist Services Ltd | Agriculture & fishing | 2026 |
| Grooveflower Limited | Professional & scientific | 2004 |
| Grosvenor W2 Ltd | Real estate | 2009 |
| Group LK Limited | Construction | 1995 |
| Grovehill Investments Limited | Real estate | 2020 |
| Gruidae Ltd | Professional & scientific | 2022 |
| GSB Design Consultants Ltd | Professional & scientific | 2023 |
| GSC Technologies Limited | Information & communication | 2013 |
| Gsfm Property Ltd | Real estate | 2025 |
| GSM Developments and Home Systems Ltd | Real estate | 2022 |
| GSM Homes Management Ltd | Real estate | 2023 |
| GSM Pharma Consulting Limited | Professional & scientific | 2012 |
| GTB Capital Maintenance Ltd | Construction | 2015 |
| Guardcrest Consultancy Ltd | Administrative & support | 2026 |
| Guarded Shield Limited | Transport & logistics | 2023 |
| Guardianship FM Services Ltd | Administrative & support | 2015 |
| Guavatree Childcare & Preschools Ltd | Education | 2017 |
| Guilty Dolls Limited | Administrative & support | 2015 |
| Gurkha Recruitment Services Ltd | Administrative & support | 2025 |
| Guru Kirpa Properties Limited | Extraterritorial | 2012 |
| GWV Capital Ltd | Real estate | 2021 |