| Four Seasons Publicity Limited | Cheltenham | 2013 |
| Four-Seasons Law Ltd | London | 2024 |
| FOX Fire Solutions Ltd | Sunbury-On-Thames | 2025 |
| Foxbury Solutions Ltd | Cowbridge | 2017 |
| Foxcote Fire Systems Limited | Epsom | 2009 |
| Foxtrot Fire Safety Ltd | Preston | 2026 |
| Foxwood Health Ltd | Liverpool | 2024 |
| Foyle Family Justice Centre C.I.C. | Londonderry | 2021 |
| Foyle Safety Services Ltd | Londonderry | 2013 |
| Fozz Care Limited | Derby | 2024 |
| FR365 Ltd | Seaham | 2022 |
| FRA London Ltd | London | 2025 |
| Fraigneux Limited | Rochester | 2009 |
| Frama Care Services Limited | Wellingborough | 2019 |
| Frame-Jay Support Ltd | Bilston | 2022 |
| Frami Consultancy Limited | Halifax | 2015 |
| Frampton Fire Ltd | Milton Keynes | 2021 |
| Framwellgate IT Limited | Durham | 2017 |
| Francis & SON Construction Limited | Fareham | 2007 |
| Francoch Ltd | Birmingham | 2026 |
| Francophone Lawyers UK CIC | London | 2026 |
| Frankie Family Centre Ltd | Morden | 2024 |
| Frankies Legal Services Ltd | Hartlepool | 2025 |
| Franklin and Mason Healthcare Limited | St. Leonards-On-Sea | 2026 |
| Frankly Health Care Limited | Halifax | 2015 |
| Fraser Health Training Ltd | Greenford | 2020 |
| Fraxel Fire Door Compliance Ltd | West Molesey | 2023 |
| Frazergriffiths Limited | Lichfield | 2024 |
| Frcpass Limited | Liverpool | 2024 |
| Frearson TM Contracts Ltd | Doncaster | 2024 |
| Fredrickson Bobadilla Ltd | Stevenage | 2023 |
| Free Body Challenge Ltd | Swanscombe | 2025 |
| Free Congo DRC C.I.C. | London | 2025 |
| Free From Eczema Ltd | Manchester | 2025 |
| Free Representation Unit | London | 2018 |
| Freedom 1ST Care Ltd | Bedworth | 2022 |
| Freedom Fire & Safety Ltd | Bury | 2021 |
| Freedom for ALL Ltd | London | 2025 |
| Freedom From Abuse Community Interest Company | Bedford | 2018 |
| FREEDOM4BETTERLIFE Ltd | London | 2020 |
| Freeport East Limited | Harwich | 2022 |
| Freesprings Limited | London | 2019 |
| Freestyle Fire Ltd | Castleford | 2025 |
| Freilich Therapies Ltd | London | 2022 |
| Frenchcare Ltd | London | 2022 |
| Fresh Driving Limited | Southampton | 2025 |
| Fresh Haven Healthcare Ltd | Bristol | 2018 |
| Fresh Home Cleaning Services Limited | Amersham | 2022 |
| Fresh Hope Fertility PVT Ltd | Southend-On-Sea | 2025 |
| Fresh Tree Care Services Limited | Basildon | 2019 |
| Fresh Wealth Management Ltd | Leeds | 2018 |
| Friedrich-Ebert-Stiftung London Limited | London | 2022 |
| Friends for Lives C.I.C. | Southend-On-Sea | 2021 |
| Friends of Griff Wood Community Interest Company | Market Rasen | 2015 |
| Friends of Hunts Cross CIC | Liverpool | 2024 |
| FRM London Limited | Brentford | 2022 |
| Frnk Solutions Ltd | Harrogate | 2023 |
| Frontier Fire Doors London Ltd | Windsor | 2026 |
| Frontline Community Protection Ltd | Newton Abbot | 2015 |
| Frontline Safety Training Ltd | Warwick | 2025 |
| Frontlinefire UK Limited | Wigan | 2020 |
| Frontview Healthcare Limited | London | 2025 |
| FRV Consulting Ltd | Chorley | 2022 |
| FS Consultants Limited | Augher | 2024 |
| FS07BAK Ltd | Southampton | 2025 |
| FSA Care Limited | Walsall | 2025 |
| FST - Fire Safety Techs Limited | London | 2018 |
| FTA Extinguishers Limited | Dorking | 2024 |
| FTM 50 Limited | Lincoln | 2015 |
| FTS Training and Safety Ltd | Littlehampton | 2017 |
| Fulcrum Advisory Service Ltd | Liverpool | 2024 |
| Fulcrum Defence Services Ltd | Monmouth | 2020 |
| Fulcrum Healthcare Ltd | Leicester | 2022 |
| Fulfire Limited | Plymouth | 2025 |
| Full Circle Global Development CIC | London | 2025 |
| Full Circle Professional Services C.I.C. | Croydon | 2018 |
| Fullman Fire Protection Ltd | London | 2025 |
| Fums Consultancy Ltd | Leicester | 2026 |
| FUN and Gains Therapy Ltd | Sittingbourne | 2022 |
| Fundermental Ltd | London | 2020 |
| Fundraising Regulator | London | 2016 |
| Furlong Logistics Limited | Bridgnorth | 2025 |
| Furyfire Risk Management Ltd | London | 2020 |
| Fusion Therapeutics Ltd | Manchester | 2024 |
| Fust Fire Ltd | Walsall | 2025 |
| Future Energy Partners Limited | Truro | 2012 |
| Future Fire and Voice Ltd | Kings Langley | 2023 |
| Future Fire Protection Ltd | Lewes | 2013 |
| Future Fire Solutions Limited | Portsmouth | 2013 |
| Future Forces C.I.C. | London | 2023 |
| Future Safety Consultants Limited | Middleton | 2021 |
| Futureplex Limited | London | 2022 |
| Futurus Squared Limited | Chelmsford | 2021 |
| FYA Risk Assessments Ltd | Nottinghamshire | 2023 |
| Fyre Solutions Limited | Norwich | 2024 |
| G & D Farmer PA Limited | Ryde | 2025 |
| G & G Priority Healthcare Limited | London | 2019 |
| G &H Care Limited | Liverpool | 2017 |
| G and K Care Services Ltd | London | 2023 |
| G ASH Consultancy Limited | Fareham | 2024 |