| Gavriluta Construction Limited | Construction | 2026 |
| GB Grips Services Ltd | Administrative & support | 2017 |
| Gb&T Limited | Financial services | 2020 |
| GBP (Swindon) Management Company Ltd | Real estate | 2007 |
| GBP Chichester (Phase 2) Management Company Limited | Real estate | 2017 |
| GBP Chichester (Roadway) Management Company Ltd | Real estate | 2012 |
| GBP Chichester Management Company Limited | Real estate | 2015 |
| GC Contract Services Limited | Administrative & support | 2019 |
| GC Management Group Limited | Real estate | 2025 |
| GCA Fixers Ltd | Construction | 2017 |
| GCH Medical Ltd | Health & social care | 2025 |
| Gclm DC Ltd | Administrative & support | 2025 |
| GD Props Limited | Information & communication | 2012 |
| Gdbim Ltd | Professional & scientific | 2024 |
| Gdrj Limited | Real estate | 2024 |
| GDT Holdings Ltd | Financial services | 2023 |
| GE Engineering Solutions Ltd | Professional & scientific | 2018 |
| GEE JAY Farming Limited | Agriculture & fishing | 2011 |
| Geez Visual Studio Ltd | Professional & scientific | 2016 |
| Geia UK Limited | Financial services | 2024 |
| GEM Gems Ltd | Manufacturing | 2022 |
| Gemec Limited | Construction | 2015 |
| Gemini Capital LLP | | 2011 |
| Gemview Limited | Financial services | 1985 |
| Genaron Media Limited | Professional & scientific | 2011 |
| Generics Group Limited | Manufacturing | 2018 |
| Genesis Educational Consulting Ltd | Education | 2020 |
| Genesis Productions Ltd | Information & communication | 2003 |
| Genesis Publications Limited | Manufacturing | 1975 |
| Genex Consulting Group Ltd | Professional & scientific | 2025 |
| Genie Agency Limited | Administrative & support | 2013 |
| Genie Rentals Limited | Administrative & support | 2016 |
| Gent Properties Management Limited | Real estate | 2021 |
| Gent Property Management Ltd | Real estate | 2020 |
| Gents B Grooming Ltd | Other services | 2026 |
| Genuine Ecommerce Solutions Ltd | Wholesale & retail | 2015 |
| Genwell UK Limited | Health & social care | 2025 |
| GEO & Jesi Limited | Construction | 2007 |
| George Barber Ltd | Other services | 2022 |
| George William Construction Ltd | Construction | 2015 |
| Geoshore Limited | Professional & scientific | 2007 |
| Geostructural Solutions Ltd | Construction | 2004 |
| Gerhok Properties Limited | Real estate | 2016 |
| Gerhosto Bari Limited | Hospitality | 2025 |
| German Car Centre Ltd | Wholesale & retail | 2018 |
| Getjar Limited | Construction | 1980 |
| Getjar Piling Limited | Construction | 2022 |
| Getjar Special Projects Limited | Construction | 2022 |
| Getk Limited | Information & communication | 2021 |
| Getting Older Dressage Society Central Limited | Other services | 2007 |
| Geznetics Communications Ltd | Professional & scientific | 2016 |
| GFF Trading Limited | Wholesale & retail | 2021 |
| GG PPE Limited | Wholesale & retail | 2022 |
| GG4GO Ltd | Transport & logistics | 2024 |
| Ggiuk Ltd | Administrative & support | 2019 |
| GH Creative Ltd | Arts & recreation | 2025 |
| Ghara Leicester Ltd | Hospitality | 2026 |
| Gherhes Ltd | Transport & logistics | 2024 |
| GHO Services Limited | Hospitality | 2025 |
| Ghost & Star Ltd | Wholesale & retail | 2026 |
| Gianni Transport Ltd | Transport & logistics | 2018 |
| Giant Cars Limited | Wholesale & retail | 2023 |
| Gibson Court (N11) RTM Company Limited | Households | 2019 |
| Giesenow Consulting Ltd | Other services | 2017 |
| Gift Healthcare Services Ltd | Administrative & support | 2023 |
| Giggabox Events Limited | Information & communication | 2024 |
| Gilgorlan Ltd | Administrative & support | 2024 |
| Gilnor Limited | Administrative & support | 2016 |
| Gilroz Limited | Real estate | 2020 |
| GIM Valeting Services Ltd | Other services | 2018 |
| Gimenez & Quayle Ltd | Financial services | 2026 |
| Ginger Gifts Limited | Wholesale & retail | 2007 |
| Gingermed Ltd | Health & social care | 2014 |
| Giovanna Ticciati Ltd | Manufacturing | 2001 |
| Girop Properties Limited | Financial services | 2025 |
| Giuseppe Trapasso Limited | Transport & logistics | 2018 |
| Giza LLP | | 2026 |
| GJB Pharma Limited | Wholesale & retail | 2014 |
| GJM Props Ltd | Arts & recreation | 2024 |
| Gjoka Development Service Ltd | Manufacturing | 2024 |
| GKZ Ltd | Education | 2020 |
| GL (Dubai) Limited | Administrative & support | 2017 |
| GL (Slough) Limited | Financial services | 2016 |
| Gladwells Rutland Limited | Wholesale & retail | 2020 |
| Glam Accountancy Limited | Professional & scientific | 2025 |
| Glass & Glazing Services Ltd | Construction | 2023 |
| Glasservice Limited | Construction | 1991 |
| Glasshouse Team Holding Ltd | Financial services | 2022 |
| Glasshouse Team Management 1 Ltd | Financial services | 2022 |
| Glasshouse Team Management 2 Ltd | Financial services | 2024 |
| Glasshouse Team Management 3 Ltd | Financial services | 2025 |
| Glaucus International Limited | Wholesale & retail | 2013 |
| Glebe Music Company Limited | Other services | 1967 |
| Glencoe Plant Services Limited | Construction | 1994 |
| Glengate Limited | Hospitality | 2021 |
| Glenmarine Management Ltd | Real estate | 2023 |
| Glenmore (Dover) Management Company Limited | Real estate | 2008 |
| Glenmore (Fratergate Gosport) Management Limited | Real estate | 2005 |
| Glenmore (J2 Ashford) Limited | Real estate | 2006 |
| Glenmore (Quedgeley) Management Limited | Real estate | 2004 |