| George Street Mansions Management Company Limited | Households | 1999 |
| George the Cardmaker Ltd | Wholesale & retail | 2020 |
| George's Trans Ltd | Transport & logistics | 2020 |
| George’S Workshop Limited | Wholesale & retail | 2017 |
| Gerager Ltd | Wholesale & retail | 2020 |
| Gerard Mann Limited | Wholesale & retail | 1960 |
| Gesti Renovations Ltd | Construction | 2022 |
| GET Alignd Limited | Information & communication | 2025 |
| GET Carter Interiors Ltd | Construction | 2012 |
| GET Fruitful Marketing Ltd | Professional & scientific | 2015 |
| GET IT Done London Ltd | Construction | 2026 |
| GET Knotted Carpentry Limited | Manufacturing | 2005 |
| GET WED Ltd | Hospitality | 2022 |
| GET Wired (Kent) Ltd | Construction | 2013 |
| Getatrade Herlink Ltd | Administrative & support | 2025 |
| Getatrade Link Ltd | Information & communication | 2025 |
| Geza Builders Limited | Construction | 2024 |
| Gezer Boutique Pastry Ltd | Manufacturing | 2020 |
| GF Style Ltd | Wholesale & retail | 2026 |
| GFT4 Limited | Financial services | 2025 |
| Gftretailgroup Limited | Wholesale & retail | 2025 |
| Ggma Limited | Information & communication | 2003 |
| Ghareeb Ltd | Hospitality | 2019 |
| Ghem Group Ltd | Administrative & support | 2026 |
| GHK Developments Limited | Construction | 2019 |
| Ghopen Ltd | Transport & logistics | 2019 |
| Ghost (KH) Limited | Hospitality | 2022 |
| Ghost LAB Innovation Ltd | Administrative & support | 2017 |
| Ghumti Limited | Hospitality | 2017 |
| GI UK Group Ltd | Construction | 2018 |
| GIA Consulting CTA Ltd | Information & communication | 2019 |
| Gibbons & Sons Contractors Limited | Construction | 2013 |
| Gibbs Facades Ltd | Construction | 2019 |
| Gibson Commercial Holdings Limited | Financial services | 2025 |
| Gibson Wells Limited | Real estate | 2003 |
| Gicu Logistics Ltd | Transport & logistics | 2016 |
| Gidley GAS Services Ltd | Construction | 2024 |
| Giedrem Design Limited | Professional & scientific | 2016 |
| Giftease Solutions Limited | Information & communication | 2019 |
| Gigi Cosmetics Ltd | Wholesale & retail | 2025 |
| Giles Warner Ltd | Professional & scientific | 2017 |
| Gilgenkrantz & Co Limited | Administrative & support | 2010 |
| Gilham and Gilham Glass Co. Ltd. | Administrative & support | 2005 |
| Giltbrook Carehomes Ltd | Professional & scientific | 2001 |
| Giltspur Associates Limited | Information & communication | 2016 |
| Gimi Ltd | Wholesale & retail | 2024 |
| Ginfix Limited | Real estate | 2016 |
| Ginnons Sports and Entertainment Company Limited | Information & communication | 2024 |
| Giorgiana's Giacomo Ltd | Wholesale & retail | 2020 |
| Giraffedog Technical Services Limited | Information & communication | 2004 |
| Girling Holdings Group Limited | Financial services | 2025 |
| Gittens Home Designs Limited | Professional & scientific | 2015 |
| Give ME Sun Ltd | Wholesale & retail | 2023 |
| Giveandtake Limited | Wholesale & retail | 2025 |
| Gizzi Erskine Ltd | Professional & scientific | 2011 |
| GJ Properties LLP | | 2007 |
| GJL Brickwork Limited | Construction | 2016 |
| GJW Transport Ltd | Transport & logistics | 2024 |
| GK Decor Ltd | Construction | 2021 |
| GK Design Limited | Professional & scientific | 2010 |
| GKC Claremount Accountancy Ltd | Professional & scientific | 2025 |
| GKC Claremount Limited | Administrative & support | 2024 |
| GKC Properties Limited | Real estate | 2017 |
| GKM Dropshippers Ltd | Wholesale & retail | 2024 |
| GL Holdco UK Limited | Information & communication | 2022 |
| GL1 Projects UK Ltd | Construction | 2024 |
| GLA Transports Ltd | Transport & logistics | 2020 |
| Gladstone Road Management Company Limited | Hospitality | 1988 |
| Glam on Ltd | Other services | 2021 |
| Glamorous Glass Ltd | Wholesale & retail | 2005 |
| Glamour 2 Beaut Ltd | Wholesale & retail | 2026 |
| Glampin Ltd | Administrative & support | 2024 |
| Glamping Innovations Limited | Hospitality | 2020 |
| Glancy Ltd | Information & communication | 2025 |
| Glayton Gardens Development Limited | Other services | 2004 |
| Glazzilla Ltd | Construction | 2020 |
| GLE Studio Ltd | Real estate | 2015 |
| Glebe Electrical Contractors Ltd | Wholesale & retail | 2010 |
| Gleeson Holdings Ltd | Financial services | 2025 |
| Glen Attewell Limited | Professional & scientific | 2017 |
| Glen Cawdor Limited | Hospitality | 1979 |
| Glenpani (Sweden) Limited | Professional & scientific | 2022 |
| Glensound Electronics Limited | Manufacturing | 1978 |
| Glenstone Home Designs Limited | Construction | 2018 |
| GLH Property Hub Limited | Real estate | 2024 |
| Glinns Ltd | Construction | 2016 |
| Gliss Technologies Limited | Information & communication | 2023 |
| GLO Contractors Ltd | Construction | 2021 |
| Global Air Limited | Construction | 2025 |
| Global Business Centers Limited | Professional & scientific | 2014 |
| Global Centre for Legislative Studies Ltd | Professional & scientific | 2025 |
| Global Essence Limited | Other services | 2002 |
| Global Event Staffing Limited | Administrative & support | 2019 |
| Global Fresh Supply Limited | Administrative & support | 2021 |
| Global Growth Consultancy Ltd | Professional & scientific | 2016 |
| Global Industrial Safety Solutions Ltd | Professional & scientific | 2022 |
| Global Interface Limited | Administrative & support | 1998 |
| Global Maritime Business Club CIC | Administrative & support | 2025 |
| Global Match Brothers Limited | Other services | 2021 |
| Global Remote Sensing Consultants Ltd | Information & communication | 2018 |