| FES Engineering Limited | Administrative & support | 2022 |
| Festival Boost Store Limited | Wholesale & retail | 2024 |
| Feyn Properties Limited | Real estate | 2018 |
| FFJ Photo & Consulting Ltd | Professional & scientific | 2018 |
| FGB Validation Limited | Professional & scientific | 2019 |
| FGC Consultancy Ltd | Administrative & support | 2026 |
| FH Packaging Ltd | Administrative & support | 2020 |
| Fibre-Ology Ltd | Information & communication | 2023 |
| Fibreglass Roof Kits Ltd | Construction | 2025 |
| FIC Property Ltd | Real estate | 2025 |
| Fiddlers Ferry Trading Limited | Arts & recreation | 2024 |
| Fideliti Ltd | Administrative & support | 2005 |
| Field UK Services Limited | Other services | 2018 |
| Field's Cross (Management Company) Limited | Real estate | 2007 |
| Fields View Management Company Limited | Households | 2024 |
| Fieldspring Consulting Ltd | Professional & scientific | 2015 |
| Fientech Ltd | Professional & scientific | 2021 |
| Fierce Leotards Ltd | Wholesale & retail | 2024 |
| Fifth Percentile Limited | Administrative & support | 2016 |
| Fight Equipment UK Limited | Wholesale & retail | 2014 |
| Fighter Blueprint Online Limited | Education | 2024 |
| Figrd Limited | Information & communication | 2018 |
| Figueira & SON Ltd | Construction | 2014 |
| Fill the GAP Limited | Administrative & support | 2020 |
| Filler HQ Limited | Other services | 2025 |
| Film Hub Limited | Arts & recreation | 2025 |
| Filmex CZ Ltd. | Information & communication | 2015 |
| Filmtransport.Com Limited | Administrative & support | 1986 |
| Filters.Co.Uk Ltd | Manufacturing | 2001 |
| Filtration Medic Ltd | Professional & scientific | 2007 |
| Fin-Insight Limited | Administrative & support | 2025 |
| Finance Solutions (UK) Limited | Financial services | 2008 |
| Financeforce Limited | Financial services | 1994 |
| Financial Edge Limited | Information & communication | 2003 |
| Finbay Consulting Limited | Professional & scientific | 2022 |
| Finch Lettings Ltd | Real estate | 2021 |
| Finch Surveyors Ltd | Professional & scientific | 2017 |
| Finconsu Limited | Administrative & support | 2024 |
| Find a Physio Ltd | Information & communication | 2026 |
| Find My House Ltd | Financial services | 2021 |
| Find Surfaces Limited | Construction | 2017 |
| Find-Theone Ltd | Wholesale & retail | 2024 |
| Findsfab Ltd | Manufacturing | 2026 |
| Fine Arrangement Limited | Wholesale & retail | 2022 |
| FINESQUASH76667 Ltd | Extraterritorial | 2016 |
| Finesse Blinds Ltd | Wholesale & retail | 2026 |
| Finishing Room Ltd | Manufacturing | 2026 |
| Finmax Construction Ltd | Construction | 2026 |
| Finn's Contract Tiling Ltd | Construction | 2025 |
| Finnalo Ltd | Other services | 2026 |
| Finneran Psychotherapy Limited | Health & social care | 2023 |
| Fino Cleaning Services Ltd | Administrative & support | 2023 |
| Fino Footwear Ltd | Wholesale & retail | 2018 |
| Finorm Studio Ltd | Professional & scientific | 2023 |
| Finsure Marketing Ltd | Professional & scientific | 2023 |
| Finwines Ltd | Other services | 2018 |
| Fiona Lawrence Interiors Limited | Professional & scientific | 2019 |
| Fire and Security Engineers Limited | Manufacturing | 2018 |
| Fire and Security National Partners Limited | Administrative & support | 2013 |
| Fire Protection Compliance Limited | Administrative & support | 2010 |
| Fire Protection Direct Limited | Wholesale & retail | 2022 |
| Fire Protection Sprinklers Ltd | Wholesale & retail | 2022 |
| Fire Regulated Solutions Limited | Public administration | 2011 |
| Fire Sector Federation Limited | Financial services | 2019 |
| Fireaway Northenden Limited | Hospitality | 2020 |
| Firebird Design Limited | Administrative & support | 2011 |
| Fireblade Transport Limited | Transport & logistics | 2013 |
| Firecheck (North West) Limited | Administrative & support | 2003 |
| Fired on Friday Famous by Monday Ltd | Arts & recreation | 2026 |
| Firefly Labs Ltd | Administrative & support | 2026 |
| Fireflyprog Limited | Information & communication | 2017 |
| Firegold Services Ltd | Information & communication | 2025 |
| Fireheart Digital Limited | Information & communication | 2020 |
| Firepro Solutions Limited | Administrative & support | 2007 |
| Firezom Ltd | Wholesale & retail | 2019 |
| Firs Lane Management Company NO.1 Limited | Extraterritorial | 2007 |
| Firs Lane Management Company NO.2 Limited | Extraterritorial | 2007 |
| Firs Lane Management Company NO.3 Limited | Extraterritorial | 2007 |
| Firs Park Associates Ltd | Professional & scientific | 2014 |
| First AID Holdings Limited | Financial services | 2017 |
| First AID Supplies Limited | Wholesale & retail | 2005 |
| First Choice Nurseries UK Ltd | Health & social care | 2025 |
| First Click Marketing Limited | Professional & scientific | 2018 |
| First Health Imaging Limited | Health & social care | 2007 |
| First Lighting Projects Limited | Manufacturing | 2008 |
| First Northern Developments Limited | Households | 2003 |
| First Objective Limited | Information & communication | 2011 |
| First OWL Enterprise Limited | Professional & scientific | 2018 |
| First Placed Ltd | Information & communication | 2016 |
| First Rate Cars Ltd | Wholesale & retail | 2010 |
| First Recruitment Group Limited | Administrative & support | 2026 |
| First Resilience Ltd | Extraterritorial | 2013 |
| First Steps Nursery Limited | Extraterritorial | 2001 |
| First Steps Private Day Nursery (Lowton) Limited | Health & social care | 2001 |
| First Teachers Recruitment Limited | Education | 2025 |
| First Technical Recruitment Limited | Administrative & support | 1997 |
| First Water Hygiene Ltd | Water & waste | 2020 |
| Firstkind (Singapore) Ltd | Health & social care | 2017 |
| Firstkind Ltd | Professional & scientific | 2010 |
| Firstkind Research and Development Ltd | Health & social care | 2023 |