| Friends of Frank Ltd | Agriculture & fishing | 2024 |
| From Limited | Wholesale & retail | 2011 |
| FS Pallet Solutions Limited | Administrative & support | 2001 |
| Fuel the Fire Limited | Professional & scientific | 2006 |
| Full Moon Holdco 4 Limited | Administrative & support | 2006 |
| Full Moon Holdco 5 Limited | Administrative & support | 2006 |
| Full Moon Holdco 6 Limited | Administrative & support | 2006 |
| Full Moon Holdco 7 Limited | Administrative & support | 2015 |
| FULLMOONPROPCO1 Limited | Professional & scientific | 2014 |
| FULLMOONPROPCO2 Limited | Real estate | 2024 |
| FULLMOONPROPCO3 Limited | Real estate | 2025 |
| FULLMOONPROPCO4 Limited | Real estate | 2025 |
| FULLMOONPROPCO5 Limited | Real estate | 2025 |
| FULLMOONPROPCO6 Limited | Real estate | 2026 |
| FULLMOONPROPCO7 Limited | Real estate | 2026 |
| Fundamentum Services Limited | Construction | 2023 |
| Funkybunnie Direct Limited | Wholesale & retail | 2002 |
| Future Work (Recruitment) Ltd | Administrative & support | 2012 |
| Futurefabric Limited | Professional & scientific | 2008 |
| G & L Trading Limited | Wholesale & retail | 1997 |
| G a Carpentry Limited | Construction | 2015 |
| G&P1 Limited | Real estate | 2022 |
| G&P2 Limited | Real estate | 2022 |
| G.M.Q. Ltd. | Education | 1993 |
| G.P GAS Limited | Construction | 2019 |
| Galahad Consulting Ltd | Professional & scientific | 2023 |
| Gallant (Thame) Limited | Wholesale & retail | 2012 |
| Garage Door Expert Ltd | Manufacturing | 2015 |
| Garsington RDA Ltd | Health & social care | 2010 |
| Garthside Consulting Limited | Professional & scientific | 2023 |
| Gary Porter Consultancy Services Limited | Financial services | 2015 |
| Gcloud Management Ltd | Wholesale & retail | 2021 |
| Geckosquared Limited | Professional & scientific | 2017 |
| Gemma Randall Weddings Ltd | Professional & scientific | 2026 |
| Gemsoft Limited | Information & communication | 2008 |
| General Products Ltd | Information & communication | 2011 |
| Generative Imagination Ltd | Information & communication | 2024 |
| Geoenergy Design Ltd | Professional & scientific | 2020 |
| George Anderson Coaching Limited | Other services | 2006 |
| George Anderson Speaking Limited | Professional & scientific | 2022 |
| Gerard Skinner Media Limited | Information & communication | 2011 |
| Ghost Rider Haulage Ltd | Transport & logistics | 2023 |
| Giggli Ltd | Information & communication | 2018 |
| GJC Automotive Ltd | Other services | 2018 |
| GJS Data Solutions Ltd | Information & communication | 2025 |
| Glo-Ed Ltd | Administrative & support | 2021 |
| Glynswood Thame Ltd | Wholesale & retail | 2025 |
| Goldcup Fresh Holdings Limited | Financial services | 2024 |
| Golden EGG Innovation Limited | Professional & scientific | 2015 |
| Good Imports Ltd | Wholesale & retail | 2020 |
| Goplanetary Ltd | Professional & scientific | 2024 |
| GP Chambers Limited | Professional & scientific | 2011 |
| Grainman Limited | Wholesale & retail | 2000 |
| Grant Wardrop Productions Limited | Information & communication | 2013 |
| Graphic Works Limited | Information & communication | 2004 |
| Grasslands Legal Limited | Professional & scientific | 2023 |
| Gray Investment Group Limited | Financial services | 2020 |
| Gray Productions Ltd | Professional & scientific | 2023 |
| Greatflair Limited | Administrative & support | 2000 |
| Green Ammonia Working Group Ltd. | Professional & scientific | 2021 |
| Green END Barn Limited | Real estate | 2019 |
| Greenopez Ltd | Real estate | 2022 |
| Greens of Thame Ltd | Wholesale & retail | 2023 |
| Greenstone Plumbing and Heating Limited | Construction | 2022 |
| Greenx Technology Ltd | Professional & scientific | 2023 |
| Grendon Independent Financial Services Limited | Financial services | 2004 |
| Greys Mead Limited | Information & communication | 2009 |
| Groba TV Limited | Arts & recreation | 2018 |
| Groundforce (UK) Ltd | Other services | 2014 |
| Grove END Barns Management Limited | Households | 1996 |
| Groves of Thame (Holdings) Limited | Financial services | 2014 |
| Groves of Thame Limited | Wholesale & retail | 1975 |
| Grow Create Limited | Information & communication | 2012 |
| Growth Seeker Publishing Ltd | Information & communication | 2025 |
| Guestkey Cloud Limited | Information & communication | 2025 |
| Guestkey Group Limited | Financial services | 2019 |
| Guestkey Limited | Information & communication | 1991 |
| Guestkey Property Limited | Administrative & support | 2021 |
| Gupta Medical Services Limited | Health & social care | 2026 |
| GUY Hatfield Limited | Information & communication | 2006 |
| H.S.G. Events Limited | Arts & recreation | 2004 |
| H2O Water Based Paints Limited | Construction | 2019 |
| Habitas Architects Limited | Professional & scientific | 2014 |
| Hadan Delucy Ltd | Professional & scientific | 2022 |
| Haddenham Healthcare Limited | Health & social care | 1998 |
| Haka Advisory Ltd | Information & communication | 2022 |
| Halling Howells Ltd | Information & communication | 2008 |
| Halls House of Colour Ltd | Construction | 2026 |
| Hannah Brooke Ltd | Professional & scientific | 2016 |
| Hanover Project Management Limited | Professional & scientific | 2016 |
| Harber Homes Ltd | Real estate | 2018 |
| Harris Electrical Limited | Wholesale & retail | 1942 |
| Harrison Catering Services Limited | Hospitality | 1993 |
| Harrison SD Holdings Limited | Financial services | 2006 |
| Hawkstone Commercial Finance Ltd | Professional & scientific | 2024 |
| Hawthorn Real Estate Development Ltd | Real estate | 2019 |
| Haynes Solutions Ltd | Professional & scientific | 2013 |
| Hazelton Management Limited | Households | 2017 |
| HBH (Farming) Limited | Agriculture & fishing | 2002 |
| Healix Property LLP | | 2009 |