| Four Plus Two Ltd | Professional & scientific | 2022 |
| FOX Farm Ltd | Agriculture & fishing | 2019 |
| FOX Spring Property Management Ltd | Real estate | 2020 |
| FP (YE Corner) Limited | Real estate | 2019 |
| Fractional Go to Market Services Ltd | Administrative & support | 2025 |
| Fraggle Limited | Construction | 2023 |
| Freeform Technology Ltd | Manufacturing | 2008 |
| Freesties Ltd | Manufacturing | 2019 |
| Freestone Design House Limited | Professional & scientific | 2025 |
| Fresh Start Catering Limited | Hospitality | 2007 |
| Full Circle Homes Limited | Real estate | 2021 |
| Fulwell Foods Ltd | Wholesale & retail | 2003 |
| G and D Holdcroft Limited | Education | 2023 |
| G H Flooring Specialist Limited | Construction | 2025 |
| G Plant Solutions Ltd | Wholesale & retail | 2023 |
| G Richardson Windows Limited | Construction | 2003 |
| G.W.C Services (Brackley) Ltd | Households | 2024 |
| G44 Solutions Limited | Professional & scientific | 2024 |
| Gallant Girls Ltd | Wholesale & retail | 2020 |
| Gallyot Consulting Limited | Education | 2017 |
| Galpath Ltd | Professional & scientific | 2016 |
| Gambetta Solutions Limited | Professional & scientific | 2026 |
| Gamesvault Brackley Limited | Wholesale & retail | 2025 |
| GAP Risk Consulting Ltd | Administrative & support | 2021 |
| Garage 59 Group Ltd | Arts & recreation | 2015 |
| Garage Conversions UK (Oxon) Ltd | Construction | 2025 |
| Garnex Ltd | Professional & scientific | 2003 |
| GB Scaffolding (Brackley) Limited | Construction | 2020 |
| Geest Consultancy Limited | Professional & scientific | 2011 |
| GEL Ventures Ltd | Information & communication | 2025 |
| Gelato ‘N’ Drench Ltd | Wholesale & retail | 2020 |
| Gemini Transmissions Ltd | Manufacturing | 2008 |
| Geoi Ltd | Information & communication | 2020 |
| GET Yourself Moving Ltd | Arts & recreation | 2025 |
| Ghgservices Limited | Professional & scientific | 2021 |
| Ghss Limited | Professional & scientific | 2012 |
| Gianluca Grasso Catering Limited | Hospitality | 2023 |
| Gibson Estates Limited | Real estate | 2020 |
| Gilberts Plumbing & Heating Services Ltd | Construction | 2024 |
| Gilroy Steel Solicitors Limited | Professional & scientific | 2015 |
| Gilstock Limited | Extraterritorial | 2023 |
| Ginger Dog Engineering Ltd | Professional & scientific | 2019 |
| Glebe Autotech Limited | Wholesale & retail | 2016 |
| Glebe Farm Commercial Lettings Ltd | Real estate | 2021 |
| Glebe Farm Limited | Agriculture & fishing | 2013 |
| Glebe Farm Shop Farthinghoe Ltd | Wholesale & retail | 2024 |
| Glen Iris Limited | Real estate | 2025 |
| Glendon Acres Limited | Financial services | 2020 |
| Global Railway Signalling Ltd | Professional & scientific | 2024 |
| GM Digital Imaging Limited | Professional & scientific | 2008 |
| GMC Roof-Improvements Limited | Construction | 2024 |
| Go Direct Cremations Limited | Other services | 2022 |
| Go-Large Design and Build Ltd | Construction | 2013 |
| Goldcrest 15 Ltd | Households | 2023 |
| Golden Barber 27 Ltd | Other services | 2021 |
| Good for What Ales YA Ltd | Wholesale & retail | 2022 |
| Goodhart Holdings Limited | Real estate | 2019 |
| Goodhart Property Ltd | Real estate | 2020 |
| Goodhart Ventures Ltd | Agriculture & fishing | 2023 |
| Goose Green Property Company Limited | Administrative & support | 1989 |
| Goss Engineering Solutions Ltd | Professional & scientific | 2025 |
| GP Apex Ltd | Arts & recreation | 2024 |
| GPB Digital Ltd | Information & communication | 2017 |
| Grab Hire 123 Ltd | Administrative & support | 2025 |
| Graceful Cuts Ltd | Other services | 2022 |
| Gracey-G Ltd | Professional & scientific | 2014 |
| Grandspire Developments Ltd | Construction | 2025 |
| Green ANT Consulting Ltd | Professional & scientific | 2019 |
| Green ARK Limited | Construction | 2013 |
| Green Mechanical Solutions Limited | Construction | 2013 |
| Greenacres Garage Group Ltd | Wholesale & retail | 2023 |
| Greensleeves Garden Care Limited | Other services | 1998 |
| Greensleeves Holdings Ltd | Financial services | 2019 |
| Greensleeves Lawn Care Limited | Other services | 2004 |
| Grey Simmonds Food Service Equipment Limited | Manufacturing | 1977 |
| Grey Simmonds Limited | Wholesale & retail | 2008 |
| GRN Electrical Ltd | Construction | 2021 |
| Groundline Advisory Limited | Professional & scientific | 2026 |
| Growbag Ventures Limited | Transport & logistics | 2016 |
| GTI Tax Ltd | Administrative & support | 2008 |
| GTR (MK) Limited | Administrative & support | 1995 |
| GTR Property Management Limited | Real estate | 2021 |
| Gurr Graphics Ltd | Professional & scientific | 2024 |
| H-Eng Ltd | Manufacturing | 2023 |
| H. & B.A. Investments Limited | Real estate | 1972 |
| Hair by Meredith Edwards Limited | Other services | 2021 |
| Hall Farm Energy Limited | Energy | 2016 |
| Hallstead Limited | Real estate | 2003 |
| Halpin Homes Ltd | Construction | 2020 |
| Hampers Limited | Wholesale & retail | 2006 |
| Hampers Property Ventures Limited | Real estate | 2020 |
| Hard Stone Firms Ltd | Administrative & support | 2020 |
| Hardcastle Consulting Ltd | Professional & scientific | 2019 |
| Harkwood Homes Ltd | Construction | 2023 |
| Harris Financial Management Ltd | Financial services | 2020 |
| Harris Property Services (Brackley) Ltd | Construction | 2026 |
| Harrison James Ltd | Households | 2023 |
| Harvey Capital Ltd | Real estate | 2023 |
| Harwood Lawns Ltd | Administrative & support | 2018 |
| Harwood Residential Properties Limited | Real estate | 2017 |