| Fyfe Wilson Ltd | Manufacturing | 1921 |
| Fyne Dynamics Limited | Manufacturing | 2001 |
| FYS Ltd | Professional & scientific | 2015 |
| FZQ Ltd | Health & social care | 2025 |
| G & a Transit Limited | Transport & logistics | 2016 |
| G & L Coffee Ltd | Hospitality | 2023 |
| G & O Services Limited | Transport & logistics | 2015 |
| G & S Lodges Limited | Construction | 2017 |
| G & S Restaurants Limited | Hospitality | 2024 |
| G a Walker Transportation Ltd | Manufacturing | 2018 |
| G Brics Ltd | Information & communication | 2019 |
| G F Dragusin Limited | Transport & logistics | 2015 |
| G J Lane Services Ltd | Construction | 2021 |
| G Jadczyszyn Limited | Construction | 2015 |
| G Johns Holdings Limited | Professional & scientific | 2020 |
| G M a Capital Advisers Ltd | Information & communication | 2014 |
| G M C Marketing Limited | Wholesale & retail | 2004 |
| G R Wright Holdings Limited | Financial services | 2026 |
| G T Jarvis Roofing Contractors Ltd | Construction | 2011 |
| G Wingate Electrical Ltd | Construction | 2026 |
| G&A Management and Construction Ltd | Construction | 2019 |
| G&S Mechanical Services Ltd | Construction | 2026 |
| G-Lan Limited | Information & communication | 2006 |
| G-Motion Transportation Ltd | Transport & logistics | 2018 |
| G. Harmas Ltd | Information & communication | 2026 |
| G.3.SAFE Ltd | Wholesale & retail | 2021 |
| G.A.Precision Products Limited | Manufacturing | 1974 |
| G.B. Air Limited | Construction | 2018 |
| G.F.D Logistics Limited | Transport & logistics | 2016 |
| G.Johns & Sons Limited | Wholesale & retail | 1943 |
| G.M. Briton Limited | Professional & scientific | 1985 |
| G.P.S. Driving School Ltd | Education | 2024 |
| G.R.Wright & Sons Limited | Manufacturing | 1913 |
| G36RECORDS Limited | Information & communication | 2022 |
| G3MEDICAL Ventures Ltd | Health & social care | 2021 |
| GAB & Eliz Ltd | Information & communication | 2021 |
| GAB Consultancy Ltd | Information & communication | 2015 |
| Gabicox Ltd | Administrative & support | 2016 |
| Gaby&Auto Ltd | Wholesale & retail | 2018 |
| Gadget BUG Limited | Wholesale & retail | 2015 |
| Gadgetplant Ltd | Wholesale & retail | 2021 |
| Gadgie Shakes Ltd | Manufacturing | 2020 |
| Gaerty Properties Ltd | Real estate | 2025 |
| Gainsborough Lodge Freehold Limited | Households | 2009 |
| Gainsborough Lodge Management Company Limited | Households | 1990 |
| Gainsthorpe Limited | Real estate | 2015 |
| Gakima Care Services Limited | Health & social care | 2015 |
| Galaxy Medical Limited | Health & social care | 2024 |
| Gallant Bridge Ltd | Health & social care | 2022 |
| Gambian OWL Limited | Information & communication | 2020 |
| Gambino Transport Ltd | Transport & logistics | 2023 |
| Gami Brothers Ltd | Wholesale & retail | 2012 |
| Gami Group Ltd | Professional & scientific | 2024 |
| Gamma Systems (Maintenance) Ltd. | Construction | 2020 |
| Gamma Systems Limited | Information & communication | 1999 |
| Ganfric Limited | Health & social care | 2024 |
| GAQ Consulting Limited | Professional & scientific | 2024 |
| Garden of India Essex Ltd | Hospitality | 2018 |
| Garden Take Away Ltd | Hospitality | 2025 |
| Gardencraft Drives & Patios Ltd | Administrative & support | 2026 |
| Garnet Construction Ltd | Construction | 2015 |
| Garrett Property Ventures Ltd | Administrative & support | 2026 |
| Garry Phillips Interiors Limited | Construction | 2007 |
| Garten Energy & Construction Ltd | Construction | 2026 |
| Gary Wayne Clarke Limited | Transport & logistics | 2017 |
| GAS Alley Ltd | Real estate | 2024 |
| Gaspar Expeditions Ltd | Transport & logistics | 2019 |
| Gates Financial Solutions Limited | Extraterritorial | 1938 |
| Gates Group Limited | Real estate | 1995 |
| Gates Leasing Limited | Administrative & support | 2004 |
| Gateway Freedom Church, Harlow | Other services | 2003 |
| Gatoblu Limited | Other services | 2025 |
| GAZ Traders Ltd | Administrative & support | 2023 |
| GB Acraman Ltd | Administrative & support | 2026 |
| GB Exterior Cleaning Ltd | Administrative & support | 2020 |
| GB Property Holdings Limited | Extraterritorial | 2021 |
| Gbit Consulting Ltd | Information & communication | 2007 |
| Gbshopspot Ltd | Information & communication | 2017 |
| GC QP Consulting Ltd | Professional & scientific | 2023 |
| GCE UK Motors Ltd | Wholesale & retail | 2022 |
| Gcv.Building Ltd | Construction | 2022 |
| GD & D Limited | Administrative & support | 2016 |
| GD Catering Ltd | Hospitality | 2024 |
| GD Services Ltd | Manufacturing | 2022 |
| Gdefor and Co Services Ltd | Professional & scientific | 2021 |
| GDI Engineering Limited | Professional & scientific | 2021 |
| GDI Life Services Ltd | Health & social care | 2022 |
| Gears on the Go Limited | Administrative & support | 2025 |
| Gearshift Car Parts Ltd | Wholesale & retail | 2025 |
| Gedmusic Ltd | Arts & recreation | 2012 |
| GEE & Garnham (International) Limited | Wholesale & retail | 2011 |
| GEE GAF Limited | Construction | 2025 |
| GEE Interiors Limited | Construction | 2025 |
| Geek Consultants Limited | Health & social care | 2016 |
| Gemar Limited | Health & social care | 2006 |
| Gemini Roofing and Leadwork Ltd | Construction | 2025 |
| GENER8 Electrical Ltd | Construction | 2025 |
| General 91 Ltd | Construction | 2019 |
| General Services Team Ltd | Construction | 2018 |
| General Team Ltd | Real estate | 2021 |