| Fidus Accounting Ltd | Peterborough | 2018 |
| Field & Fern Ltd | Winchester | 2026 |
| Field and Castle Limited | Harrow | 2014 |
| Field Boxmore Bourne (Holdings) Limited | Nottingham | 1993 |
| Field Boxmore GB Limited | Nottingham | 1932 |
| Field Bros Ltd | Deeside | 2014 |
| Field Court Legal Services Limited | London | 2006 |
| Field Decorating Services Limited | Romford | 2004 |
| Field Fastener Limited | London | 2017 |
| Field First Limited | Nottingham | 1968 |
| Field International Building Materials Co., Ltd | Beckenham | 2024 |
| Field Nominees Limited | Manchester | 2005 |
| Field OIL Limited | London | 2011 |
| Field Projects Limited | Romford | 2009 |
| Field Service TEC Limited | Kinmel Bay | 2012 |
| Field Sport UK Ltd | Derby | 2015 |
| Field View 1960 Limited | Ashbourne | 2014 |
| Fieldcam Limited | Bridgend | 2026 |
| Fieldcraft Training Ltd | Harleston | 2002 |
| Fieldex Limited | Brighton | 2012 |
| Fieldhouse Developments (South East) Limited | London | 2010 |
| Fielding & Cumber Limited | Bristol | 2008 |
| Fielding & Platt International Limited | Wakefield | 2004 |
| Fielding Management Ltd | London | 2013 |
| Fielding&Greenproperties Ltd | Birmingham | 2025 |
| Fieldmouse Limited | Brighton | 2002 |
| Fields Barn (Winfrith) Residents Limited | Dorchester | 2007 |
| Fields of Goodness Ltd | Emsworth | 2025 |
| Fields Veterinary Limited | Bristol | 2006 |
| Fieldsman Management Limited | Altrincham | 1991 |
| Fieldstrike Limited | Ross-On-Wye | 2014 |
| Fieldview Developments Ltd | Bedlington | 2005 |
| Fieldview Partnership Limited | Portsmouth | 2012 |
| Fieldwerk Limited | Brighton | 2024 |
| Fielma Holding Limited | London | 2025 |
| Fielmaas Limited | London | 2025 |
| Fieri Properties Ltd | Enfield | 2023 |
| Fiery Limited | London | 2021 |
| Fiesta City Limited | Ascot | 2010 |
| Fiesta Studios Limited | Taunton | 2026 |
| Fife College Limited | Dunfermline | 2007 |
| Fife College Prison Education Limited | Dunfermline | 2016 |
| Fife PI 2 Limited | Wirral | 2025 |
| Fife Print Centre Ltd | Kirkcaldy | 2017 |
| Fife Resources Limited | London | 1997 |
| Fife Signs Limited | Kirkcaldy | 1989 |
| Fife Silica Sands Limited | Coatbridge | 2002 |
| Fifi Cars Ltd | London | 2024 |
| Fifi Kind Care Ltd | Wakefield | 2019 |
| Fifteen Software Engineering Ltd | London | 2013 |
| Fifteen TEN Consulting Limited | Derbyshire | 2019 |
| Fifth Art Yacht Ltd | London | 2024 |
| Fifth Element Consulting Corporation Holding Limited | London | 2021 |
| Fifth Element Consulting Corporation Limited | London | 2021 |
| Fifth Element Ltd | Battle | 2024 |
| Fifty Albion Limited | London | 2011 |
| Fifty Eight Bramber Road Limited | London | 1998 |
| Fifty Fifty Post Limited | London | 2025 |
| Fifty SIX Helix Road New Freehold Management Company Limited | London | 2013 |
| Fifty SIX Riverdale Ltd | Erith | 2010 |
| Fifty-Seven & Fifty-Eight Limited | London | 2000 |
| FIG and Olive Huddersfield Ltd | Huddersfield | 2020 |
| FIG Consultants Limited | Rochester | 2008 |
| Fight Fit UK Ltd | Haslemere | 2015 |
| Fight Gear Limited | Swansea | 2014 |
| Fighting Fit Personal Training Ltd | Paisley | 2022 |
| Fighting Gear Limited | Swansea | 2023 |
| Fighting UN Limited | Swansea | 2014 |
| Figureweave Accountancy Ltd | Coulsdon | 2011 |
| Fiitstyle Ltd | Doncaster | 2017 |
| Fiji Skin Clinic Limited | Birmingham | 2021 |
| Fijian BBQ UK Ltd | Wantage | 2022 |
| Fiko TR Ltd | London | 2025 |
| Fikula Capital Management Limited | London | 2022 |
| FIL SHP Trustee (UK) Limited | Tadworth | 2024 |
| Filabox Limited | | 2000 |
| Filbuk 313 Limited | Cardiff | 1993 |
| Filde Holdings Limited | Chelmsford | 1998 |
| File Focus Limited | Eastbourne | 2013 |
| File Nominees Limited | Manchester | 2005 |
| Filearm Limited | Bristol | 1989 |
| Filebank Limited | Greenford | 2002 |
| Filepure Limited | Chorley | 1999 |
| Filetest Limited | Hove | 2000 |
| Filethat Limited | Bolton | 2011 |
| Filinarsen Ltd | Wellingborough | 2017 |
| Filing Plus Group Limited | Bilston | 2001 |
| Filing Plus Limited | Bilston | 2000 |
| Filip Entrepenad Invest Limited | London | 2020 |
| Filip Entrepenad Limited | London | 2020 |
| Fill Inner Limited | London | 2020 |
| Fill Macan Limited | Glasgow | 2018 |
| Filled-Valley Link UK CIC | London | 2006 |
| Fillet Steak Ltd | Harrogate | 2012 |
| FILLINGSTATION163 Limited | Prestonpans | 2020 |
| Fillrex Ltd | Kington | 2026 |
| Film Cars Limited | Dalkeith | 2015 |
| Film City Edinburgh Ltd | Glasgow | 2012 |
| Film Friendly Ltd | Halesowen | 2025 |
| Film FX Limited | Sevenoaks | 2015 |