| GMT Interiors Limited | Manufacturing | 2003 |
| Go Bust Ltd | Manufacturing | 2025 |
| Go Greek Group Ltd | Hospitality | 2023 |
| GO4LESS Ltd | Wholesale & retail | 2023 |
| Goapages Ltd | Information & communication | 2024 |
| Gobavo Limited | Manufacturing | 2022 |
| Gobble Consultancy Limited | Other services | 2008 |
| Godridge Property Limited | Real estate | 2003 |
| Gold Executive Ltd | Information & communication | 2023 |
| Gold Investors Ltd | Real estate | 2018 |
| Gold Leaf Homes Limited | Real estate | 2019 |
| Gold Tour Ltd | Wholesale & retail | 2025 |
| Golden Years Group Limited | Other services | 2025 |
| GOLDEN2DOT Ltd | Transport & logistics | 2023 |
| Goldilocks Pillows Limited | Real estate | 2011 |
| Goldsmith Fmcg Consultancy Ltd | Professional & scientific | 2016 |
| Goldthorne Properties Ltd | Construction | 2025 |
| Goldtruck Pegc Limited | Financial services | 2022 |
| Golf Specific Fitness Ltd | Arts & recreation | 2020 |
| Gonzagri Ltd | Hospitality | 2024 |
| Good Life Technologies Ltd | Information & communication | 2015 |
| Goods Commerce Limited | Information & communication | 2017 |
| Goose and Berry Food Limited | Hospitality | 2024 |
| Goose and Berry Limited | Hospitality | 2014 |
| Gopang Ltd | Wholesale & retail | 2024 |
| Gordons Property Lawyers Limited | Professional & scientific | 1999 |
| Gorillahub Limited | Professional & scientific | 2015 |
| Gould Consultancy Services Ltd | Professional & scientific | 2015 |
| Gouldsborough (UK) Ltd | Professional & scientific | 2014 |
| Goveda Enterprises Ltd | Wholesale & retail | 2026 |
| Governance Consultants Limited | Professional & scientific | 2011 |
| Goyals Holdings Limited | Real estate | 2018 |
| Goyals Limited | Wholesale & retail | 2007 |
| GP Tech Serv Limited | Administrative & support | 2017 |
| GR Extra Space UK Ltd | Construction | 2023 |
| Grace M&A Limited | Real estate | 2015 |
| Grace Weller Ltd | Wholesale & retail | 2022 |
| Graceoptics Limited | Health & social care | 2017 |
| Gracie ECG Ltd | Health & social care | 2025 |
| Graeme Ainscough Limited | Professional & scientific | 2014 |
| Grain UP Ltd | Manufacturing | 2020 |
| Grand Design Blinds Ltd | Construction | 2012 |
| Grand Interiors Design Limited | Wholesale & retail | 2020 |
| Grand Tour Cars Limited | Wholesale & retail | 2015 |
| Grange Farm Meadow Cookham Limited | Real estate | 2023 |
| Grange Management Company Limited(The) | Other services | 1984 |
| Grange View Properties Limited | Construction | 1996 |
| Grant Gatherers Ltd | Professional & scientific | 2022 |
| Grant Plant (Maidenhead) Limited | Administrative & support | 1974 |
| Grant's HR Solutions Limited | Administrative & support | 2016 |
| Grantchester Lodge Management Company Limited | Households | 1988 |
| Grapevine Real Estate Ltd | Real estate | 2026 |
| Gray Pharma Consulting Limited | Professional & scientific | 2016 |
| Grays Essex Limited | Transport & logistics | 2015 |
| Grazeley Court Farm Residents Association Limited | Households | 2012 |
| GRC Homes Limited | Real estate | 2019 |
| Greek House ESC Ltd | Hospitality | 2025 |
| Greeklicious Holdings Ltd | Financial services | 2024 |
| Greeklicious Ltd | Hospitality | 2020 |
| Green IT Services Limited | Information & communication | 2016 |
| Green Leaf Consortium Ltd | Health & social care | 2025 |
| Green Management London Limited | Construction | 2021 |
| Green Oak Property Management Limited | Other services | 2020 |
| Green Planet Heating Solutions Ltd | Construction | 2020 |
| Green Siren Solutions Limited | Information & communication | 2018 |
| Green Swing Limited | Wholesale & retail | 2020 |
| Greenaway Commercial and Project Management Ltd | Professional & scientific | 2026 |
| Greene Construction Solutions Ltd | Construction | 2010 |
| Greener Aviation Limited | Manufacturing | 2023 |
| Greener Grass Limited | Administrative & support | 2014 |
| Greenhouse Learning LLP | | 2023 |
| Greenoak Homes Limited | Construction | 2017 |
| Greenology Limited | Professional & scientific | 2008 |
| Greenpeak Energy Limited | Professional & scientific | 2016 |
| Greenthreadsglobal Ltd | Wholesale & retail | 2025 |
| Greentouch Ltd | Administrative & support | 2011 |
| Greentrees Consultancy Limited | Professional & scientific | 2010 |
| Greenvale Property and Investment Co Limited | Real estate | 1954 |
| Greenwood Homes (Peaks Hill) Ltd | Real estate | 2019 |
| Greenwood Homes Holding Ltd | Construction | 2017 |
| Greenwood Homes Investment Limited | Construction | 2016 |
| Greenwoods (ST. Ives) Limited | Professional & scientific | 1959 |
| Grenville Associates Limited | Wholesale & retail | 2020 |
| Gresham Children's Services Ltd | Health & social care | 2025 |
| Grey Hare Limited | Arts & recreation | 2011 |
| Grey Holdings (Cloud) Limited | Professional & scientific | 2022 |
| Grey Socials Company Ltd | Information & communication | 2024 |
| Greys House Ltd | Professional & scientific | 2023 |
| Greystar.Life Limited | Professional & scientific | 2010 |
| Greystone Knowe Wind Farm Limited | Energy | 2017 |
| Greywaves Solutions Limited | Wholesale & retail | 2021 |
| Grid Design & Engineering Limited | Real estate | 2025 |
| Gridless Solutions Limited | Administrative & support | 2022 |
| Griffin Sports Ltd | Arts & recreation | 2015 |
| GRM2786 Limited | Professional & scientific | 2014 |
| Grobis Ltd | Professional & scientific | 2019 |
| Groffman and Wang Limited | Professional & scientific | 2021 |
| Groon Limited | Professional & scientific | 2010 |
| Grossman Properties Limited | Real estate | 2022 |
| Grosu Consulting Ltd | Professional & scientific | 2024 |