| Fyning Holdings Limited | Professional & scientific | 2023 |
| FZA Travel Ltd | Transport & logistics | 2024 |
| G & G Holiday Investments Ltd | Administrative & support | 2017 |
| G & H Carpentry Ltd | Manufacturing | 2022 |
| G + J Exports (2000) Limited | Wholesale & retail | 1999 |
| G Clover Limited | Transport & logistics | 2018 |
| G G Carpentry Ltd | Construction | 2019 |
| G I Smith Limited | Construction | 2009 |
| G J Booze Store Ltd | Wholesale & retail | 2018 |
| G M Playback Limited | Information & communication | 2012 |
| G P a Services Limited | Other services | 2016 |
| G S Motors (Aylesbury) Ltd | Manufacturing | 2007 |
| G&C Residential Ltd | Real estate | 2023 |
| G&R Electrical Solutions Ltd | Construction | 2005 |
| G&T Automotive Ltd | Wholesale & retail | 2021 |
| G-Fab Ltd | Construction | 2006 |
| G-Tech Heating & Plumbing Ltd | Construction | 2017 |
| G. Langford Limited | Professional & scientific | 2006 |
| G. Lowe Pharma Limited | Wholesale & retail | 2021 |
| G. Neal Fisheries Ltd | Agriculture & fishing | 2020 |
| G.F. Lift Hydraulics Limited | Other services | 2004 |
| G.P.P Solutions Ltd | Construction | 2019 |
| Gaba Property Investments Ltd | Real estate | 2020 |
| Gaba Workshop & Storage Solutions Ltd | Administrative & support | 2024 |
| Gabeth Limited | Wholesale & retail | 2019 |
| Gabi Trans Ltd | Transport & logistics | 2022 |
| Gabryel Trans Limited | Wholesale & retail | 2016 |
| Gabvic Business Services Ltd | Hospitality | 2024 |
| Gadget Land Limited | Professional & scientific | 2014 |
| Gadgetify Ltd | Wholesale & retail | 2025 |
| Gaia Converter UK Limited | Manufacturing | 2016 |
| Gaido Scientific Limited | Professional & scientific | 2021 |
| Galcap Ltd | Professional & scientific | 2024 |
| Gallery Office Solutions Limited | Wholesale & retail | 2002 |
| Galmviv Ltd | Public administration | 2026 |
| Game of Stones Treasure Hunts Ltd | Other services | 2020 |
| Gameside Ltd | Information & communication | 2024 |
| Gamil (Bucks) Limited | Wholesale & retail | 2014 |
| GAP Transport Limited | Administrative & support | 2017 |
| Gardenforces (Landscaping) Ltd | Administrative & support | 2024 |
| Gardening Ambitions (Landscaping) Limited | Administrative & support | 2017 |
| Garfa-Uk Ltd | Wholesale & retail | 2021 |
| Garnet Enterprise Ltd | Financial services | 2021 |
| Garrad & Lamb Commercials Ltd | Wholesale & retail | 2018 |
| Garrett Medical Aesthetics Ltd | Health & social care | 2025 |
| Gartec Ltd. | Manufacturing | 1994 |
| Gary Christopher Young Limited | Extraterritorial | 2023 |
| Gary Neal Interiors Limited | Construction | 2008 |
| GAS & Electric Certificate Ltd | Construction | 2014 |
| GAS Work and Property Maintenance Ltd | Construction | 2025 |
| Gaspodia Limited | Professional & scientific | 2023 |
| Gastree Ltd | Professional & scientific | 2020 |
| Gatcombe Management Company Limited | Households | 1986 |
| Gate Repairer Limited | Administrative & support | 2025 |
| Gatehouse Diner Ltd | Hospitality | 2022 |
| Gates of Pearls Triumphant Ltd | Information & communication | 2020 |
| Gateway Smart Sourcing Limited | Professional & scientific | 2018 |
| Gathercole Grounds Maintenance Ltd | Administrative & support | 2026 |
| Gathered Hands Limited | Wholesale & retail | 2026 |
| Gatts & Company Limited | Extraterritorial | 2019 |
| Gautam EV Ltd | Information & communication | 2021 |
| Gaze Properties Ltd | Real estate | 2021 |
| Gazelle-O CIC | Wholesale & retail | 2026 |
| Gazelle-O Group Ltd | Professional & scientific | 2023 |
| GB Catering and Packaging Ltd | Wholesale & retail | 2023 |
| GB Coder Ltd | Information & communication | 2013 |
| GB Mail Ltd | Other services | 2017 |
| GB Metal Recycling Ltd | Wholesale & retail | 2019 |
| GB Passive Windows Ltd | Manufacturing | 2017 |
| GB Renewables Investments Ltd | Administrative & support | 2010 |
| GB Renewables Limited | Extraterritorial | 2016 |
| GBR Estates Limited | Extraterritorial | 2010 |
| Gbre Limited | Extraterritorial | 2019 |
| Gbsp Limited | Construction | 2013 |
| GCI Couriers Ltd | Transport & logistics | 2018 |
| GDJ Financial Ltd | Professional & scientific | 2012 |
| GDT Building Solutions Ltd | Extraterritorial | 2016 |
| Gearguru Ltd | Administrative & support | 2025 |
| Geezers of Aylesbury Limited | Other services | 2003 |
| Geezers of Beaconsfield Limited | Other services | 2001 |
| Geliox Ltd | Information & communication | 2023 |
| Gelson Security Limited | Administrative & support | 2019 |
| Gemcro Consulting Limited | Professional & scientific | 2022 |
| Gemini Facilities Limited | Administrative & support | 2009 |
| Gemsfromceylon Limited | Manufacturing | 2016 |
| Genchi Genbutsu Limited | Professional & scientific | 2009 |
| General & Technical Facilities Maintenance Ltd | Administrative & support | 2024 |
| Generic Labels Limited | Wholesale & retail | 2006 |
| Genesis EVB Ltd | Professional & scientific | 2024 |
| Gengenbach Consulting Ltd | Professional & scientific | 2017 |
| Genie Financial Services Limited | Other services | 2010 |
| Genie Media Productions Ltd | Arts & recreation | 2016 |
| Genie Services Limited | Administrative & support | 2005 |
| Gentlebridge Ltd | Health & social care | 2025 |
| Gentry Restorations Limited | Manufacturing | 1999 |
| Genuine Gogot Limited | Hospitality | 2022 |
| Genuine Group Management Ltd | Real estate | 2020 |
| GEO Coffee Roasting Limited | Manufacturing | 2022 |
| Geoffrey James Antiques & Reclamation Limited | Wholesale & retail | 2024 |
| Geoffrey James Developments Limited | Construction | 2020 |