| Flying Sausage Ltd | Arts & recreation | 2025 |
| Flypartridge Ltd | Manufacturing | 2011 |
| FM Insight Recruitment Limited | Administrative & support | 2026 |
| FMK Spares Ltd | Wholesale & retail | 2025 |
| Fmktraders Ltd | Wholesale & retail | 2025 |
| FMX Diagnostics Tech Ltd | Wholesale & retail | 2026 |
| FNB Transport Ltd | Transport & logistics | 2021 |
| Footsteps Nursery Limited | Education | 2008 |
| FOR YOU Health Limited | Manufacturing | 2020 |
| Fork Truck Parts U.K Limited | Wholesale & retail | 2018 |
| Form Brands Studio Limited | Professional & scientific | 2018 |
| Forma Automotive Ltd | Wholesale & retail | 2025 |
| Formation Landscapes Ltd | Construction | 2018 |
| Forrest Building Services Limited | Construction | 2025 |
| Forty Bricks Digital Limited | Professional & scientific | 2018 |
| Fortytwo Marketing Limited | Arts & recreation | 2008 |
| Fountain GAS Services Ltd | Construction | 2025 |
| Four Keys Property Group Ltd | Real estate | 2025 |
| Four Ninety Insights Ltd | Professional & scientific | 2026 |
| Fouracre Accountancy Services Limited | Professional & scientific | 2005 |
| Fouracre Consultancy Services Limited | Professional & scientific | 1999 |
| Fourth Chiltern Park (Management) Limited | Households | 1978 |
| Fowles Fitness Limited | Arts & recreation | 2015 |
| FOX Legal Limited | Professional & scientific | 2018 |
| FOX Love Press Limited | Professional & scientific | 2019 |
| Foxfield Securities Limited | Real estate | 1995 |
| Foxvale Properties Limited | Hospitality | 1983 |
| FPL Property Investments Ltd | Financial services | 2008 |
| Franklin-Fergus Property Group Limited | Construction | 2019 |
| Franklins Law Leighton Buzzard Ltd | Professional & scientific | 2018 |
| Freddie and Friends Sunshine Stop C.I.C. | Health & social care | 2017 |
| Freddy Turismo Ltd | Administrative & support | 2019 |
| Frederick Investments Limited | Real estate | 2019 |
| Free Spirit Assets Limited | Real estate | 2009 |
| Free Spirit Automotive Limited | Wholesale & retail | 2004 |
| Fresh Orange Photography Limited | Professional & scientific | 2004 |
| Freshair Filter Ltd | Wholesale & retail | 2024 |
| Friction Marketing Company Limited | Manufacturing | 1991 |
| Fromages DE France Limited | Real estate | 1980 |
| Front 9 to 5 Ltd | Wholesale & retail | 2025 |
| Frontier Development Limited | Professional & scientific | 2008 |
| Frosts Landscape Construction Limited | Administrative & support | 1974 |
| Fuelup Foods Limited | Hospitality | 2025 |
| Funfin Ltd | Professional & scientific | 2022 |
| Funky Snake Escape Ltd | Arts & recreation | 2026 |
| Funtivity Play Village Limited | Arts & recreation | 2023 |
| Furnished Living Estates Ltd | Real estate | 2024 |
| Furzehill Developments Ltd | Real estate | 2018 |
| Fuse Insight Ltd | Professional & scientific | 2019 |
| Futebol DE Salao Mklb Limited | Arts & recreation | 2017 |
| Fuudvibes Catering and Cleaning Services Limited | Hospitality | 2025 |
| G & E Property Investments Limited | Construction | 2013 |
| G & G Barbers (Bletchley) Limited | Other services | 2018 |
| G & G Barbers (LB) Limited | Other services | 2020 |
| G & G Barbers (MK) Limited | Other services | 2018 |
| G & G Inventory Services Limited | Administrative & support | 2008 |
| G a Transport & Storage Ltd | Transport & logistics | 2021 |
| G Franklin Electrical Ltd | Construction | 2019 |
| G J Ellerton Ltd | Manufacturing | 2018 |
| G J F Limited | Real estate | 2000 |
| G R Electrical Contractors Ltd | Construction | 2015 |
| G U Alfonga Limited | Manufacturing | 2012 |
| G&A Facilities Services Limited | Administrative & support | 2005 |
| G.B.I. Farms Limited | Agriculture & fishing | 1988 |
| G.B.I. Properties Limited | Real estate | 2003 |
| G.F. Kite (Glass Merchants) Limited | Construction | 1975 |
| G.P. Builders (Ampthill) Limited | Construction | 1977 |
| G.R. Heating & Plumbing Ltd | Construction | 2011 |
| G1 Car Supermarket Ltd | Wholesale & retail | 2022 |
| G7 Transport Ltd | Transport & logistics | 2021 |
| GA Retail Limited | Wholesale & retail | 2017 |
| Gabor Logistics Ltd | Transport & logistics | 2021 |
| Gabriel Global Foods Imports and Exports Limited | Manufacturing | 2026 |
| Gabriella's Dressing Room Ltd | Wholesale & retail | 2021 |
| Gallafents Ltd | Professional & scientific | 2016 |
| Gallow Ltd | Professional & scientific | 2014 |
| Galvin Properties Limited | Real estate | 1988 |
| Gameplan Europe Limited | Information & communication | 1988 |
| GAP Construction Consultants Limited | Professional & scientific | 2012 |
| Gara RTM Company Limited | Households | 2008 |
| Garage Door Workshop Ltd | Wholesale & retail | 2000 |
| Gartall Limited | Professional & scientific | 2026 |
| Gary Bird Consulting Ltd | Construction | 2015 |
| Gascoigne Halman Group Limited | Financial services | 2015 |
| Gaskets for Classic Vehicles.Com Ltd | Manufacturing | 2019 |
| Gaskets for Classics Limited | Manufacturing | 1999 |
| Gategrove Limited | Administrative & support | 1995 |
| Gatepark Properties Limited | Real estate | 1998 |
| Gateway Telecom Systems Limited | Other services | 2012 |
| GB Independent Claims UK Limited | Administrative & support | 2011 |
| GB Martial Arts Ltd | Arts & recreation | 2025 |
| GBI Cars Limited | Wholesale & retail | 2014 |
| GBK Property Holdings Ltd | Real estate | 2026 |
| Gbma Limited | Real estate | 2009 |
| Gcma Properties Limited | Real estate | 2014 |
| GDM Electrical Buckinghamshire Ltd | Manufacturing | 2010 |
| Gdpartnerz Limited | Transport & logistics | 2025 |
| Geeklabz Digital Ltd | Professional & scientific | 2025 |
| GEM Futures Limited | Administrative & support | 2014 |
| GEN+1 Limited | Other services | 2024 |