| Front Runner Express Limited | Maidenhead | 2008 |
| Front Street Tynemouth Limited | Morpeth | 2008 |
| Frontbowl Limited | Moulton Seas End | 2008 |
| Frontech Tools and Abrasives Limited | London | 2016 |
| Frontenac Trading Ltd | London | 2025 |
| Frontier Design Automation Ltd | Cambridge | 2012 |
| Frontier Film Projects Ltd | Hereford | 2017 |
| Frontier for International Services Limited | Manchester | 2026 |
| Frontier Oncology Limited | Beaconsfield | 2014 |
| Frontier Payroll Services Limited | Lightwater | 1994 |
| Frontier Peak Advisory Group Ltd | Manchester | 2026 |
| Frontier Software Investments Limited | Surrey | 1965 |
| Frontier Utility Limited | Loughton | 2017 |
| Frontline Building Services Solutions Limited | St Neots | 2022 |
| Frontline Furniture Limited | Hockliffe | 2008 |
| Frontline Home Entertainment Ltd | Skelmersdale | 2014 |
| Frontline Medical Group Ltd | Shenfield | 2020 |
| Frontline Online Ltd | Fakenham | 2020 |
| Frontline Sales Limited | Essex | 2007 |
| Frontline Signs Limited | Stockport | 2008 |
| Frontline Smart Energy Limited | St Neots | 2022 |
| Frontline Training Group Ltd | Dundee | 2020 |
| Frontline UKG Ltd | Bury St Edmunds | 2024 |
| Frontlot Property Management Limited | Rainham | 1990 |
| Frontman Limited | Ayr | 1999 |
| Frontos Properties Ltd | Bangor | 2024 |
| Frontridge Aviation Limited | London | 2013 |
| Fross Property Development Ltd | Bristol | 2026 |
| Frost Bros (Electrical) Limited | Leigh-On-Sea | 2001 |
| Frost Marlborough Ltd | Chippenham | 2012 |
| Frost Valley Capital Holdings Ltd | Manchester | 2026 |
| Frost Van Centre Limited | Newcastle Upon Tyne | 2016 |
| Frost Waves Ltd | London | 2025 |
| Frost-Tech Limited | Oxford | 2010 |
| Frostbite Labs Ltd | Gillingham | 2024 |
| Frosted Peak Capital Management Ltd | Manchester | 2026 |
| Frostology Ltd | Enfield | 2025 |
| Frosty Healthcare Ltd | Barnsley | 2021 |
| Frosty Van Rental Limited | Baildon | 2012 |
| Froyoo Ltd | Manchester | 2021 |
| Frozen Feet Ltd | Poole | 2023 |
| Frozen Fish Food Limited | Ashton-Under-Lyne | 2019 |
| FRR Solutions Limited | Peterborough | 2004 |
| FRT Ltd | Bromley | 2025 |
| Frtn Limited | London | 2019 |
| Frugal Limited | Worksop | 2015 |
| Frugal Trading Ltd | Shipley | 2003 |
| Fruit Hotels Limited | London | 2014 |
| Fruit Logic Limited | Crayford | 2017 |
| Fruitland Ltd | Birmingham | 2021 |
| Fruits DE MER Limited | Ramsgate | 2020 |
| Fruits of Nature Limited | Oldham | 2013 |
| FRY Capital Partners Forestry Limited | Darlington | 2015 |
| FRY Capital Partners Limited | Darlington | 2019 |
| FRY Capital Partners Renewable Energy Limited | Darlington | 2014 |
| FRY Capital Partners Tech Limited | Darlington | 2014 |
| Fryd Limited | London | 2018 |
| Frydman Properties Limited | London | 1955 |
| Fryer & Callis Ltd | Stamford | 2024 |
| Fryer Trustees Limited | Knutsford | 2021 |
| Fryerward Limited | Cirencester | 2014 |
| Frying Holdings Limited | Hull | 2022 |
| FS & M Holdings Ltd | London | 2017 |
| FS Altrincham Limited | Nottingham | 2000 |
| FS Cables Limited | London | 1978 |
| FS Capital Alternative Investments Ltd | Doncaster | 2022 |
| FS Capital Global Equity Limited | Doncaster | 2022 |
| FS Capital Group Ltd | Doncaster | 2022 |
| FS Capital Markets Limited | Doncaster | 2022 |
| FS Capital Mining & Investments Limited | Doncaster | 2022 |
| FS Construction Services Ltd | Romford | 2015 |
| FS Ecom Limited | London | 2023 |
| FS Investments Limited | Waltham Cross | 2015 |
| FS Recruitment Ltd | Huntingdon | 2008 |
| FS Wealth Rank Limited | London | 2024 |
| Fsar Ltd | Stewarton | 2012 |
| FSB Gold Club Limited | Blackpool | 2006 |
| FSB Lyme Regis Ltd | Seaton | 2024 |
| FSB Sales Limited | Blackpool | 2011 |
| FSC Global Limited | London | 2001 |
| FSC Worldwide Limited | Cheddar | 2011 |
| FSE Employee Trustee Limited | Bristol | 2020 |
| FSF Developments Limited | Faversham | 2016 |
| FSJ Investment Limited | London | 2011 |
| FSJ Trans Limited | London | 2011 |
| FSK Group Limited | Birmingham | 2016 |
| FSK Traders Limited | Crawley | 2017 |
| FSL Construction Ltd | Bristol | 2019 |
| Fspg Trustees Limited | London | 2013 |
| FSR UK Holdings Ltd | Ringwood | 2025 |
| FSS Limited | Folkestone | 1999 |
| FSY Consulting Ltd | Blackburn | 2023 |
| FT (Dormant) Limited | London | 1968 |
| FT Dine Ltd | Pontyclun | 2019 |
| FT Tech North America Limited | Sunbury-On-Thames | 2007 |
| FTA Pension Plan Trustee Limited | Tunbridge Wells | 2021 |
| Ftax Limited | Bath | 2016 |
| FTC Asset Tracking Ltd | Leicester | 2014 |
| Ftdi Holding Limited | London | 2021 |
| Ftel Pension Trustee Limited | Bracknell | 2015 |