| Future Planning Wealth Management Limited | Financial services | 2015 |
| Future Proof Tax Planning Ltd | Professional & scientific | 2025 |
| Future Roots Property Company Limited | Real estate | 2025 |
| Futureon Limited | Information & communication | 2021 |
| Futuresense Limited | Arts & recreation | 2004 |
| Futuresense Travel Services Limited | Administrative & support | 2001 |
| Futuresmiths Business Support Ltd | Administrative & support | 2023 |
| Futurovate Connects Ltd | Information & communication | 2026 |
| Fuziondot Group Limited | Information & communication | 2024 |
| FYI C.I.C. | Education | 2021 |
| G & C Limited | Professional & scientific | 2017 |
| G & H Property Developments Ltd | Real estate | 2020 |
| G & M RTM Company Ltd | Households | 2019 |
| G & M Services (Swindon) Limited | Manufacturing | 2016 |
| G & P Automotive Limited | Wholesale & retail | 2023 |
| G a Plant and Tool Hire Ltd | Administrative & support | 2015 |
| G B E G Consultants Limited | Professional & scientific | 2013 |
| G C Quantity Surveying Limited | Professional & scientific | 2023 |
| G Catering Ltd | Wholesale & retail | 2023 |
| G Grueso Ltd | Information & communication | 2024 |
| G J House Maintenance Limited | Other services | 2021 |
| G J Services (Swindon) Limited | Construction | 2008 |
| G K Takeaway Ltd | Hospitality | 2024 |
| G L M (Swindon) Limited | Hospitality | 2024 |
| G L Motors Limited | Wholesale & retail | 2010 |
| G Metals Ltd | Wholesale & retail | 2024 |
| G Mmas Limited | Health & social care | 2014 |
| G R and SON Roofing Limited | Construction | 2013 |
| G R F Construction Ltd | Construction | 2015 |
| G R Services (Swindon) Limited | Construction | 2002 |
| G Rock Ltd | Information & communication | 2011 |
| G&J Structural Engineers Ltd | Construction | 2015 |
| G&W Contracting Holdings Limited | Financial services | 2020 |
| G&W Contracting Limited | Administrative & support | 2010 |
| G. & T. Williams (Course) Limited | Arts & recreation | 1970 |
| G. J. Handy (Holdings) Ltd | Professional & scientific | 2015 |
| G. J. Handy (Properties) Ltd | Real estate | 2015 |
| G. J. Handy (Trading) Ltd | Wholesale & retail | 1955 |
| G. Teuchmann Limited | Health & social care | 2022 |
| G.B Contracts Limited | Wholesale & retail | 1998 |
| G.Keen & Sons(Swindon)Limited | Real estate | 1963 |
| G.M.Authentic Ltd | Other services | 2022 |
| G.M.G Slomian Ltd | Transport & logistics | 2015 |
| G.P. Burners (CIB) Limited | Manufacturing | 2011 |
| G.S.C. Logistics & Transport Limited | Transport & logistics | 2015 |
| G.V. Hall Limited | Construction | 2004 |
| G2 Facilities Group Limited | Construction | 2022 |
| G2 Facilities Limited | Construction | 2022 |
| G2 Installations Limited | Construction | 2021 |
| G2 Landscaping Limited | Administrative & support | 2022 |
| G2 Maintenance Limited | Construction | 2022 |
| G2 Security Services Limited | Administrative & support | 2022 |
| G5 Evolution Elite LLP | | 2023 |
| G6 Electrical Limited | Construction | 2018 |
| GA Property Holdings Ltd | Real estate | 2019 |
| Gabeso Limited | Information & communication | 2010 |
| Gabriella Baker Ltd | Professional & scientific | 2023 |
| GAC Roofline Ltd | Construction | 2023 |
| Gafari Properties Limited | Real estate | 2022 |
| Gaffney Renewables Limited | Professional & scientific | 2021 |
| GAG Developments Ltd | Construction | 2024 |
| Gaha Property Ltd | Real estate | 2019 |
| Gaia Construction Ltd | Construction | 2015 |
| Galasso Ltd | Real estate | 2023 |
| Galaxy Aggregate Limited | Transport & logistics | 2018 |
| Galen View Technologies Ltd | Information & communication | 2026 |
| Galileo UK Devco Ltd | Professional & scientific | 2022 |
| Gallan Park Cannock Management Company Limited | Extraterritorial | 2010 |
| Gallant Security Services Ltd | Other services | 2019 |
| Gallery 23 Ltd | Wholesale & retail | 2024 |
| Galloper Wind Farm Holding Company Limited | Financial services | 2015 |
| Galloper Wind Farm Limited | Energy | 2010 |
| Galo Fine Foods Ltd | Wholesale & retail | 2018 |
| Galteo Ltd | Hospitality | 2025 |
| GAM Security Solutions Limited | Administrative & support | 2018 |
| Gamada Ltd | Transport & logistics | 2020 |
| Gambigo Ltd | Information & communication | 2026 |
| Games Media Limited | Professional & scientific | 2020 |
| Games Talk (Supplies) Limited | Manufacturing | 1998 |
| Games Talk Limited | Extraterritorial | 2004 |
| Gamlet Co Limited | Real estate | 2024 |
| Gamscore Limited | Information & communication | 2025 |
| Gandsa Ltd | Health & social care | 2024 |
| Ganea Trans Ltd | Transport & logistics | 2023 |
| Gannicott Enterprises Ltd | Real estate | 2012 |
| Gaoth Mara Energy Construction Limited | Professional & scientific | 2022 |
| Gapes Ltd | Other services | 2025 |
| Garage Door Rescue Limited | Construction | 2014 |
| Garantell Limited | Wholesale & retail | 2016 |
| Garazo Ltd | Real estate | 2023 |
| Garden Close (Sutton Benger) Management Company Ltd | Households | 2024 |
| Garden Doctors Landscapes Ltd | Administrative & support | 2005 |
| Garden Ezee Limited | Construction | 2015 |
| Garden of Eden (Conservatories) Limited | Manufacturing | 1986 |
| Gardenfresh Limited | Extraterritorial | 2009 |
| Gardening Naturally Limited | Wholesale & retail | 2003 |
| Gardensrus Wilts Ltd | Administrative & support | 2018 |
| Gareth Andrew Davies Ltd | Arts & recreation | 2021 |
| Gareth Mark Britten Limited | Extraterritorial | 2025 |
| Gareth Neal Limited | Manufacturing | 2003 |