| Flytippers R US Limited | Luton | 2023 |
| FM Metals Limited | Enniskillen | 2012 |
| FM Waste Limited | Preston | 2018 |
| FME Waste Management and Removals Ltd | York | 2025 |
| FML Waste Solutions Limited | Rainham | 2022 |
| Foam Solutions Limited | Pontefract | 2001 |
| Focus HSE Consultancy Ltd | Salford | 2020 |
| Focus Rubbish Removals Limited | Folkestone | 2025 |
| FOD Waste Clearance Limited | Cheltenham | 2025 |
| Fog-Wash Limited | Northwood | 2022 |
| Fogcheck Ltd | Cwmbran | 2020 |
| Foila Birmingham Limited | Milton Keynes | 2024 |
| Foila Ipswich Limited | Milton Keynes | 2024 |
| Foila London Limited | Milton Keynes | 2024 |
| Foila Nottingham Limited | Milton Keynes | 2024 |
| Foila Teesside Limited | Milton Keynes | 2023 |
| Foilcycle Ltd | Chester | 2024 |
| Folee Recycling Waste Ltd | London | 2025 |
| Follaton Water Services Ltd | Shepton Mallet | 2004 |
| Folley & SON Ltd | Marlow | 2021 |
| Fontus Water Ltd | Farnham | 2018 |
| Food 4 Soil Ltd | Southport | 2023 |
| Food Waste 4 Autism C.I.C. | Belfast | 2018 |
| Food Waste Diversion Limited | Strabane | 2015 |
| Food Waste Services Ltd | Bournemouth | 2018 |
| Food Waste Solutions Ltd | London | 2025 |
| Footprint Properties Ltd | Sheffield | 2011 |
| Foottit & Whatley (Shopfitters) Limited | | 1958 |
| Forbes Inc Ltd | Ashford | 2021 |
| Force Drainage Ltd | Crawley | 2024 |
| Forceshift (Contracting) Limited | Boston | 1989 |
| Forceshift Skip Hire Limited | Boston | 2010 |
| Fordaskip Limited | Eastbourne | 2023 |
| Forde's Reclamations Ltd | Birmingham | 2021 |
| Fordhelp Limited | Bristol | 2012 |
| Fordpad Limited | Swansea | 1982 |
| Forearth Limited | Aylesbury | 2023 |
| Foresight Resources Ltd | London | 2024 |
| Forest Metals Limited | Coleford | 2019 |
| Forest Park Ground Care Limited | Dungannon | 2021 |
| Forest Recycling Project Limited | London | 1989 |
| Forestry and Agricultural Restoration Ltd | Workington | 2016 |
| Forever Changes Strip OUT Limited | Harrogate | 2025 |
| Forevergreen Environmental Remediation Ltd | London | 2025 |
| Forge Holdings Limited | Hull | 1991 |
| Forge Metal Recycling Limited | Milton | 2015 |
| Forge Recycling (Scotland) Ltd | Dumbarton | 2019 |
| Forge Recycling (UK) Limited | High Wycombe | 2010 |
| Forgeq Ltd | Birmingham | 2021 |
| Formet Resources Limited | London | 2022 |
| Formulaoutsourcing Limited | Coventry | 2018 |
| Fornax (North East) Limited | Norwich | 2020 |
| Forrester Consultancy Services Limited | Redditch | 2017 |
| Forsa Utilities Limited | Gravesend | 2024 |
| Forth Land Care Ltd | North Berwick | 2007 |
| Forth Resource Management Limited | North Berwick | 2002 |
| Forth Valley Waste Solutions Ltd | Glasgow | 2026 |
| Fortis IBA (Calvert) Limited | Eastleigh | 2019 |
| Fortis IBA (Scotland) Limited | Edinburgh | 2020 |
| Fortis IBA (South East) Limited | Eastleigh | 2019 |
| Fortis IBA DC Limited | Eastleigh | 2026 |
| Fortis IBA Holdco Limited | Eastleigh | 2019 |
| Fortis IBA Limited | Eastleigh | 2017 |
| Fortitude Environmental Limited | Southampton | 2012 |
| Fortress Architectural Ltd | Dawdon Seaham | 1991 |
| Fortress FM Ltd | Oldbury | 2025 |
| Fortress Recycling and Resource Management Ltd | Warwick | 1986 |
| Fortress Recycling Ltd | Lichfield | 2018 |
| Forward Drains Limited | Birmingham | 1985 |
| Forward Environmental Limited | Sheffield | 2005 |
| Forza Recycling Ltd | Bradford | 2021 |
| Fosse Services Ltd | Hull East Yorkshire | 1995 |
| Fosse Water Treatment Limited | Grimsby | 2004 |
| Foster Risk Solutions Ltd | Eastleigh | 2025 |
| Fosters Waste Services Limited | Worcester | 2019 |
| Foundry Steels Ltd. | Grangemouth | 2005 |
| Four Counties Metal Recycling Limited | Sunninghill | 2022 |
| Four Leaf Clover Properties Limited | Carlisle | 2012 |
| Fouroaks Grab Hire Essex Ltd | Chipping Ongar | 2025 |
| FOX Brothers (Storefitters) Limited | Bradford | 1948 |
| FOX Skips Ltd | London | 2024 |
| FOX Waste Water Services Limited | Peterborough | 2010 |
| Foxcub Collections Limited | Birstall | 2019 |
| Foxhall Demolition Ltd | Birstall | 2024 |
| Foxhall Environmental Services Limited | Birstall | 2009 |
| Foxtrot Consultancy Ltd | London | 2024 |
| Foxwell Trading Limited | Chelmsford | 2023 |
| Foxy Sewage Ltd | Redhill | 2026 |
| FPW Services Ltd | London | 2014 |
| Fpwm Limited | Holmfirth | 2013 |
| Frank Recycling Ltd | Axminster | 2020 |
| Frank's Waste Ltd | Bristol | 2026 |
| Franks Portlock Consulting Limited | Sunderland | 2006 |
| Frankwood Property Maintenance Ltd | Colchester | 2019 |
| Fraser Evans & Sons Limited | Witney | 2002 |
| Fraser Water Services Ltd | London | 2011 |
| Frasers Waste Management Ltd | Tarbert | 2020 |
| Frater Urban Quarry Ltd | Bristol | 2021 |
| Fratia Reunion Ltd | Loughborough | 2025 |
| Frayling Limited | | 1945 |