| G&I Mechanical and Plumbing Ltd | Construction | 2018 |
| G-Clean Cleaning Services Limited | Administrative & support | 2025 |
| G-Clean Commercial & Domestic Services Ltd | Administrative & support | 2025 |
| G. & J. Barry Brickwork Limited | Construction | 2005 |
| G.K Interiors & Decorating Ltd | Construction | 2020 |
| G.K. Services Limited | Manufacturing | 1986 |
| G.K.C. Electrical Engineers Limited | Administrative & support | 1999 |
| G.King Building & Property Maintenance Limited | Construction | 2013 |
| G2 Construction and Consultancy Ltd | Construction | 2020 |
| G7 Removal Ltd | Transport & logistics | 2023 |
| GA & Associates Construction Limited | Construction | 2021 |
| GA IT Ltd | Information & communication | 2013 |
| GAB Decorating Limited | Construction | 2016 |
| Gabrodige Global Service Limited | Health & social care | 2015 |
| Gaby M Ltd | Transport & logistics | 2019 |
| Gadget 4 Service Ltd | Wholesale & retail | 2019 |
| Gadget City Ltd | Wholesale & retail | 2024 |
| Gafton Builders Ltd | Construction | 2018 |
| GAI Properties Ltd | Real estate | 2025 |
| Gaia Facilities & Property Management Ltd | Real estate | 2008 |
| Gakudi Ltd | Other services | 2018 |
| Gale Property Investments Ltd | Real estate | 2026 |
| GAM Civil Engineering Limited | Construction | 2019 |
| Gamoti Enterprise Ltd | Hospitality | 2014 |
| Gapbridge Properties and Constructions Limited | Construction | 2025 |
| Garage 147 Ltd | Wholesale & retail | 2024 |
| Garda Properties Ltd | Real estate | 2021 |
| Garden Care Services (Dunstable) Limited | Administrative & support | 2001 |
| Garden of Lotus Limited | Real estate | 2021 |
| Gardening Delight and Landscaping Ltd | Administrative & support | 2024 |
| Garlina Steel Installations Ltd | Manufacturing | 2017 |
| Garnet Lodder Adolescent Services Limited | Health & social care | 2014 |
| Garrett Roofing Limited | Construction | 2014 |
| GAS Boiler & Heating Ltd | Construction | 2021 |
| Gas-Ka Heating Ltd | Transport & logistics | 2008 |
| Gate Care Limited | Manufacturing | 2012 |
| GAV Solution SPV Ltd | Real estate | 2024 |
| Gavyn Lugsden Ltd | Other services | 2019 |
| GB Access Ltd | Construction | 2026 |
| GBK Asset Management Limited | Real estate | 2021 |
| GBK Property Management Limited | Real estate | 2021 |
| GBM Transport Ltd | Transport & logistics | 2024 |
| GC Cambs Limited | Wholesale & retail | 2023 |
| GCI Trans Ltd | Transport & logistics | 2026 |
| GCN Global Limited | Manufacturing | 2015 |
| Gdantrans Ltd | Transport & logistics | 2026 |
| GDP Electrical Services Ltd | Construction | 2017 |
| Gearha Limited | Real estate | 1998 |
| Gechnology Electrical Limited | Construction | 2025 |
| Gechnology Limited | Construction | 2015 |
| Gechnology Marketing Limited | Professional & scientific | 2017 |
| Gechnology Property Limited | Construction | 2019 |
| Gege Weddings Limited | Other services | 2019 |
| GEM Communication Services Limited | Administrative & support | 2003 |
| Gemini Lion PUB Co Ltd | Hospitality | 2026 |
| GEN Fiber City Limited | Manufacturing | 2020 |
| General Mechanical Services Limited | Manufacturing | 2003 |
| Genesis Engineering Limited | Manufacturing | 2021 |
| Gentac Limited | Professional & scientific | 1990 |
| GEO Express Logistics Ltd | Transport & logistics | 2025 |
| George B Ltd | Construction | 2016 |
| George Hryciuk Ltd | Transport & logistics | 2020 |
| George Pintilie Limited | Construction | 2016 |
| George ST Holdings Ltd | Real estate | 2017 |
| Georgina Service Station Ltd | Wholesale & retail | 2021 |
| Gerrads Cross Limited | Hospitality | 2025 |
| GET Glowing Ltd | Other services | 2024 |
| GET on the Tools Limited | Wholesale & retail | 2020 |
| Gfcs Services Limited | Wholesale & retail | 2001 |
| GFR Rail Ltd | Construction | 2017 |
| GG Landscaping Ltd | Other services | 2023 |
| GG Mechanical Services Ltd | Construction | 2022 |
| GG Transport Services Ltd | Transport & logistics | 2023 |
| GGB Construction Limited | Construction | 2010 |
| GH Environment & Transport Limited | Construction | 2024 |
| Ghar SE Food Craft Ltd | Wholesale & retail | 2026 |
| Gharu's Superstore Limited | Wholesale & retail | 2000 |
| Ghnd Entertainment Limited | Information & communication | 2024 |
| Ghotra Foods Ltd | Hospitality | 2017 |
| Ghotra's Ltd | Transport & logistics | 2017 |
| Gibb Electrical Ltd | Construction | 2020 |
| Gibbon Services London Ltd | Construction | 2022 |
| Gibsoncisp Ltd | Construction | 2018 |
| Giles DRY Liners Ltd | Construction | 2015 |
| Gilson Scientific Limited | Manufacturing | 1987 |
| Gina INT Limited | Construction | 2024 |
| Ginabilli Ltd | Other services | 2019 |
| Ginda Roofer PVT Ltd | Construction | 2026 |
| Ginga Designs Limited | Manufacturing | 2015 |
| Given Projects Ltd | Professional & scientific | 2011 |
| Glamor Hive Ltd | Real estate | 2024 |
| Glas Developments PHP Ltd | Construction | 2018 |
| Glassfinity Ltd | Wholesale & retail | 2020 |
| Glatz Pioneer (UK) Limited | Wholesale & retail | 2003 |
| GLC Medical Limited | Health & social care | 2021 |
| Gleneagle Manor Management Company Limited | Households | 2013 |
| Gleneden Plant Sales Limited | Wholesale & retail | 1998 |
| Gleneden Properties Limited | Construction | 2003 |
| Glider PH Ltd | Hospitality | 2022 |
| GLM Plumbing & Heating Ltd | Construction | 2026 |