| Global Portfolio Managers Limited | Information & communication | 2021 |
| Global Telecom Solutions Limited | Information & communication | 2001 |
| Global.Ngu Limited | Wholesale & retail | 2018 |
| Globeres Limited | Professional & scientific | 2013 |
| Glorious Communications Limited | Professional & scientific | 2023 |
| Glowfly Limited | Professional & scientific | 2005 |
| Gmbc LLP | | 2021 |
| GMV Nominees Ltd | Financial services | 2016 |
| GNJ Landscape Services Ltd | Administrative & support | 2021 |
| Go! Catering Limited | Manufacturing | 2022 |
| GO2GIRL London Limited | Other services | 2015 |
| Goalhanger Design Ltd | Information & communication | 2019 |
| Godley Holdings Limited | Manufacturing | 2022 |
| Gods Glitch Ltd | Wholesale & retail | 2018 |
| Golden Crown Group Limited | Administrative & support | 2022 |
| Golden Lion Aviation Limited | Transport & logistics | 2018 |
| Goldsmith Roofing Limited | Construction | 2004 |
| Goldsmith Wealth Management Ltd | Financial services | 2015 |
| Golf Escapes Limited | Professional & scientific | 2007 |
| Gooch Maloney & Partners Limited | Professional & scientific | 2010 |
| Gooch Media Partners Ltd | Professional & scientific | 2016 |
| Good Looking Drinks Ltd | Administrative & support | 2017 |
| Goodmood Prints Ltd | Wholesale & retail | 2022 |
| Goodshelter Holdings Limited | Real estate | 2022 |
| Gordian Solutions Limited | Professional & scientific | 2001 |
| Gordon General Holdings Limited | Financial services | 2025 |
| Gordon’S Greens and Groundworks Limited | Construction | 2019 |
| Gorilla Web Design Ltd | Information & communication | 2021 |
| Gould Property Consultants LLP | | 2006 |
| Governomics Limited | Professional & scientific | 2018 |
| GP Landscapes (Sussex) Ltd | Construction | 2026 |
| GPS Building Services Surrey Ltd | Construction | 2015 |
| Gpsurgerynet Limited | Manufacturing | 2019 |
| Grab & Pull Fightwear Limited | Wholesale & retail | 2018 |
| Grab Cars Sussex Ltd | Transport & logistics | 2023 |
| Grace Asset Management Limited | Financial services | 2011 |
| Grace Church Haywards Heath | Other services | 2013 |
| Grace International Trading Limited | Wholesale & retail | 2024 |
| Grace Olivia Hair Ltd | Other services | 2026 |
| Gracefield Consultants Limited | Information & communication | 2000 |
| Grapevine Media Group Ltd | Information & communication | 2020 |
| Gratus Investments Ltd | Real estate | 2025 |
| Gray Hooper Holt LLP | | 2006 |
| Great Heathmeads Residents Association Limited | Households | 1987 |
| Greater by Nature Limited | Health & social care | 2018 |
| Green Build (London) Limited | Construction | 2018 |
| Green City Trading Ltd | Wholesale & retail | 2026 |
| Green Gecko Medical Rescue Limited | Health & social care | 2016 |
| Green IVY Chartered Accountants Ltd | Professional & scientific | 2020 |
| Green Lemon Resources Limited | Information & communication | 2023 |
| Green Lycan Industries Ltd | Information & communication | 2023 |
| Green Rabbit Properties Ltd | Real estate | 2025 |
| Green Swan Limited | Professional & scientific | 2018 |
| Green Tiger Solutions Limited | Information & communication | 2025 |
| Greener Tree Care Ltd | Administrative & support | 2025 |
| Greenhill Networks Limited | Information & communication | 2022 |
| Greenhouse Online Ltd | Arts & recreation | 2009 |
| Greenlake Solutions Limited | Information & communication | 2013 |
| Greenlands Heating and Plumbing Limited | Construction | 2023 |
| Greenscape Estate and Garden Management Ltd | Administrative & support | 2004 |
| Greenswell Ltd | Arts & recreation | 2012 |
| Greg Detre Consulting Ltd | Professional & scientific | 2019 |
| Gresham Dental Practice Ltd | Health & social care | 2011 |
| Greydof Investments | Financial services | 2021 |
| Griffin Historical Limited | Arts & recreation | 2007 |
| Grimming LLP | | 2023 |
| Grimshaw Guitars Limited | Manufacturing | 2013 |
| GRM Property Holdings Group Limited | Financial services | 2025 |
| GRM Property Services Ltd | Construction | 2010 |
| Grounded 1002 Ltd | Wholesale & retail | 2021 |
| Group B Strep Support | Health & social care | 2005 |
| Grove Park Healthcare Group Limited | Health & social care | 2006 |
| Growbotics Space Ltd | Professional & scientific | 2022 |
| GSA Rentals Ltd | Households | 2022 |
| GSS Electrical Limited | Construction | 2007 |
| GT Roofing and Leadwork Limited | Construction | 2026 |
| GTA Construction Ltd | Construction | 2025 |
| Gucci Limited | Wholesale & retail | 1961 |
| Guilty Libations Limited | Manufacturing | 2016 |
| Guppy Wealth Management Ltd. | Financial services | 2017 |
| Gwasker Consultancy Limited | Professional & scientific | 2019 |
| Gwasker Investments Limited | Financial services | 2019 |
| Gyros (UK) Limited | Wholesale & retail | 2011 |
| H & N Holdings Co. Limited | Professional & scientific | 2017 |
| H13 Digital Limited | Information & communication | 2022 |
| H20 Property Management Services Limited | Administrative & support | 1998 |
| H2O Swimming Pools Limited | Construction | 1998 |
| Haeuk | Other services | 2012 |
| Haglands Limited | Administrative & support | 1963 |
| Hair Emporium Hassocks Limited | Wholesale & retail | 2003 |
| Halcyon Electrical Limited | Construction | 2009 |
| Halewood Limited | Professional & scientific | 2006 |
| Halfapenguin Limited | Administrative & support | 2010 |
| Hall Place Farms LLP | | 2005 |
| Halo Headband UK Limited | Wholesale & retail | 2011 |
| Halo Power Systems Ltd | Construction | 2025 |
| Hamilton Close Residents Ltd. | Households | 2006 |
| Hammett Shirts Ltd | Wholesale & retail | 2009 |
| Hammonds Mill Place Management Limited | Households | 2023 |
| Hamshaw Estate Management Limited | Real estate | 2008 |