| Fletcher International Exports UK Limited | Wholesale & retail | 2022 |
| Fletton Electrics Ltd | Construction | 2009 |
| Fletton Fresh Fruit & VEG Ltd | Wholesale & retail | 2026 |
| Fletton Halal Meat Ltd | Wholesale & retail | 2026 |
| Fletton Management Limited | Households | 1995 |
| Fletton Revenues Ltd | Real estate | 2014 |
| Fleurs Elegantes Ltd | Wholesale & retail | 2025 |
| Flex Connect Legal & Professional Services Ltd | Professional & scientific | 2022 |
| Flexalign Physio Limited | Health & social care | 2025 |
| Flexi Facilities Management Ltd | Administrative & support | 2024 |
| Flexi Print Shop Limited | Manufacturing | 2012 |
| Flexicare Partners Ltd | Administrative & support | 2025 |
| Flexicom Ltd | Transport & logistics | 2020 |
| Flexipod Solutions Ltd | Administrative & support | 2025 |
| Flexitrade Import-Export Ltd | Wholesale & retail | 2012 |
| Flexspace Management Limited | Real estate | 2019 |
| Flexspace NO 1 LLP | | 2014 |
| Flexspace NO 2 LLP | | 2015 |
| Flexspace NO 3 LLP | | 2019 |
| Flick Permanent Makeup Academy Ltd | Other services | 2023 |
| Flight Deck Ready Limited | Education | 2025 |
| Flint House Property Investments Ltd | Real estate | 2024 |
| FLM Sales Limited | Wholesale & retail | 2026 |
| Flo-Mech Holdings Limited | Administrative & support | 2014 |
| Flo-Mech. Limited | Manufacturing | 1974 |
| Float Fish Farm Limited | Agriculture & fishing | 2021 |
| Floe Energy Limited | Wholesale & retail | 2025 |
| Floor Cleaning Solutions Ltd | Administrative & support | 2009 |
| Floor Screed Solutions Ltd | Construction | 2012 |
| Floornest Limited | Construction | 2025 |
| Floorspan Contracts Limited | Construction | 2002 |
| Floorspan Group Limited | Financial services | 2024 |
| Floorspan Holdings Limited | Construction | 2002 |
| Floorspan Investments Limited | Financial services | 2017 |
| Floortastic UK Ltd | Wholesale & retail | 2017 |
| Floppy EAR Ltd | Wholesale & retail | 2020 |
| Flora Care Ltd | Health & social care | 2025 |
| Floravita Ltd | Wholesale & retail | 2015 |
| Flori Aesthetics Limited | Other services | 2026 |
| Floriga Ltd | Transport & logistics | 2018 |
| Florin Dudea Transport Limited | Transport & logistics | 2025 |
| Florinee Homes Ltd | Health & social care | 2017 |
| Florinpop Ltd | Transport & logistics | 2022 |
| Flossy Watt Holdings Limited | Financial services | 2021 |
| Flotrans Ltd | Administrative & support | 2020 |
| Flounte Group Ltd | Health & social care | 2024 |
| Flourish Management Ltd | Professional & scientific | 2017 |
| Flourpot Coffee Ltd | Hospitality | 2025 |
| Flowatch Ltd | Manufacturing | 2019 |
| Flowers & Gifts Designs Ltd | Wholesale & retail | 2014 |
| Flowtech(Uk) Limited | Extraterritorial | 2007 |
| Flps Services Ltd | Construction | 2026 |
| Flue Direct Limited | Professional & scientific | 2001 |
| Flue Liner Direct Limited | Other services | 2013 |
| Fluffy Jacks Limited | Hospitality | 2024 |
| Fluke Group Ltd | Wholesale & retail | 2024 |
| Flumpy Productions Ltd | Information & communication | 2024 |
| FM Accounting Ltd | Professional & scientific | 2016 |
| FM Brickwork Ltd | Construction | 2022 |
| FM Building Services Ltd | Construction | 2020 |
| FM Entertainment Group Ltd | Other services | 2017 |
| FM Motorhomes Ltd | Wholesale & retail | 2021 |
| Fmbuild Ltd | Construction | 2017 |
| FMC Electrical Ltd | Construction | 2025 |
| Fmmk Limited | Wholesale & retail | 2025 |
| Fmmrr Property Limited | Real estate | 2020 |
| Fmpbt Ltd | Construction | 2025 |
| FND Wellbeing Ltd | Health & social care | 2023 |
| Fobit Care Ltd | Health & social care | 2022 |
| Focal Point Advisory Limited | Professional & scientific | 2015 |
| Focus Search & Selection Limited | Administrative & support | 2003 |
| Focus Solutions UK Ltd | Administrative & support | 2003 |
| Foglietta System Excellence Limited | Professional & scientific | 2015 |
| Fogsons Electrical Limited | Construction | 2022 |
| Foksas Driver Ltd | Transport & logistics | 2016 |
| Fol-Naj Limited | Financial services | 2013 |
| Folalabi Farms Limited | Manufacturing | 2025 |
| Folalabi Properties Limited | Real estate | 2024 |
| Folding Picnic Bench Ltd | Administrative & support | 2022 |
| Folgate Legal Limited | Professional & scientific | 2019 |
| Folium Architects Limited | Professional & scientific | 2018 |
| Folksworth Consulting Limited | Professional & scientific | 2020 |
| Folksworth Properties Ltd | Real estate | 2025 |
| Folksworth Village PUB Company Limited | Other services | 2015 |
| Fones & Tones Ltd | Information & communication | 2013 |
| Fonetrader Peterborough Ltd | Wholesale & retail | 2025 |
| Fonezone Accessories Ltd | Wholesale & retail | 2018 |
| Fonezone Repair Clacton Ltd | Other services | 2018 |
| Fontaine Signature Group Ltd | Financial services | 2024 |
| Fontanella's Ltd | Hospitality | 2024 |
| Food Adventure Ltd | Hospitality | 2025 |
| Food Afro-Bean Ltd | Wholesale & retail | 2022 |
| Food OPS Advisory Ltd | Professional & scientific | 2026 |
| Food Sellers Limited | Wholesale & retail | 2001 |
| Food Supplements Ltd | Wholesale & retail | 2025 |
| Food-Crete Ltd | Manufacturing | 2021 |
| Foodafriq.Com Ltd | Hospitality | 2014 |
| Foody MAN Ltd | Hospitality | 2022 |
| Football Factory 4YOU Ltd | Wholesale & retail | 2024 |
| Football VS Cancer Ltd | Arts & recreation | 2024 |