| FC Heating and GAS Ltd | Construction | 2025 |
| FDM Publishing Limited | Information & communication | 2015 |
| Feldeluxe Ltd | Professional & scientific | 2025 |
| Feldon Projects Limited | Information & communication | 2016 |
| Felipe Ventures Limited | Financial services | 2017 |
| Feneley Studio 2 Limited | Professional & scientific | 2016 |
| Fenix Container Line Ltd | Transport & logistics | 2012 |
| Fenix Freight Limited | Transport & logistics | 2012 |
| Ferngate Limited | Real estate | 1962 |
| FFR Audio System Engineering Limited | Information & communication | 2023 |
| Fgaustin Limited | Professional & scientific | 2025 |
| Fhhc Ltd | Health & social care | 2023 |
| Fiadhaich Limited | Professional & scientific | 2025 |
| Fibonacci Reflections Ltd | Professional & scientific | 2014 |
| Fibre Innovations Ltd | Information & communication | 2000 |
| Fieldview Design Limited | Manufacturing | 1991 |
| Film Friendly Ltd | Extraterritorial | 2025 |
| Filmcraze Ltd | Administrative & support | 2025 |
| Filmr Ltd | Information & communication | 2020 |
| Finance-S Consultancy Service Limited | Professional & scientific | 2025 |
| Financialism Limited | Financial services | 2018 |
| Finch House Holdings Limited | Financial services | 2024 |
| Finch House Properties Limited | Financial services | 1996 |
| Finesse Windows Limited | Construction | 1981 |
| Finexos Group Holdings Limited | Information & communication | 2017 |
| Fiona Explores Ltd | Wholesale & retail | 2019 |
| Fire Secure Online Limited | Public administration | 2024 |
| Firefly Handmade Creations Ltd | Wholesale & retail | 2023 |
| Fireplace Beams UK Limited | Manufacturing | 2025 |
| Fireworks Company (West Midlands) Ltd | Wholesale & retail | 2013 |
| First AID Skills Training Emergency Room Ltd | Health & social care | 2026 |
| First Assignment Limited | Real estate | 2021 |
| First Choice Hire and Sales Ltd | Administrative & support | 2025 |
| First Choice Home Improvements (Midlands) Limited | Construction | 2023 |
| First Choice Plumbing & Maintenance Ltd | Construction | 2019 |
| First Flight Security Ltd | Administrative & support | 2025 |
| First Line Property Maintenance Ltd | Construction | 2023 |
| First-Rate Auto Sales Ltd | Wholesale & retail | 2023 |
| Fishlord African Food Stores Limited | Wholesale & retail | 2024 |
| Fit Auto Limited | Construction | 2022 |
| Fitness Concepts Ltd | Arts & recreation | 2017 |
| Fitzpatrick Doors Ltd | Extraterritorial | 2016 |
| Five Five One Limited | Arts & recreation | 2014 |
| Five Star Motors Limited | Transport & logistics | 1989 |
| Fixed Price Registrars Limited | Professional & scientific | 2009 |
| Fixed Wheel Brewery Limited | Manufacturing | 2014 |
| Fiziq Ltd | Manufacturing | 2025 |
| FJD Construction Solutions Limited | Construction | 2020 |
| FJF Limited | Extraterritorial | 2000 |
| FJM Property Investments Limited | Real estate | 2019 |
| Fjrcommerce Ltd | Wholesale & retail | 2024 |
| FLAVA25 KG Limited | Hospitality | 2025 |
| FLC - FOX Landscapes and Construction Ltd | Administrative & support | 2024 |
| Fleet Heating Services Limited | Construction | 2003 |
| Fleetcare (Public Sector Car Scheme Management) Limited | Administrative & support | 1999 |
| Fleetify Limited | Wholesale & retail | 2023 |
| Fleetsoft Limited | Administrative & support | 2008 |
| Fleming Projects Limited | Professional & scientific | 1990 |
| Floppit and Bones Limited | Financial services | 2019 |
| Flower Tots Childminding Ltd | Health & social care | 2022 |
| Flowers Care Limited | Health & social care | 2022 |
| Flowide Limited | Information & communication | 2021 |
| Flowlee Meter Verification Ltd | Manufacturing | 2013 |
| Flowlee Metering & Civils Ltd | Construction | 2025 |
| FML Project Services Ltd | Professional & scientific | 2013 |
| FMV Group Limited | Professional & scientific | 2022 |
| Foam Discs Services Limited | Transport & logistics | 2013 |
| Foley Furniture Sales Limited | Wholesale & retail | 2013 |
| Foley Patterns Limited | Administrative & support | 2002 |
| Foley Technologies Limited | Administrative & support | 2006 |
| Folkes Forge Limited | Manufacturing | 1957 |
| Folkes Forgings Acquisition Limited | Financial services | 2011 |
| Folkes Forgings Limited | Manufacturing | 1990 |
| Folliott's Manor Residents Management Company Limited | Households | 2022 |
| FOOD1979 Ltd | Hospitality | 2018 |
| Football Mundial Limited | Arts & recreation | 2001 |
| Footfall Engineering Ltd | Manufacturing | 2018 |
| Footfall Lighting Limited | Manufacturing | 2015 |
| Forgewood Midlands Ltd | Construction | 2006 |
| Forgeworksgroup Ltd | Arts & recreation | 2026 |
| Form Communications Limited | Professional & scientific | 2000 |
| FORM180 CIC | Education | 2018 |
| Format Architectural Limited | Manufacturing | 1993 |
| Format Audio Ltd | Wholesale & retail | 2024 |
| Formative Studio Ltd | Professional & scientific | 2023 |
| Formidable Marketing Limited | Professional & scientific | 2001 |
| Fortress Groundworks Ltd | Construction | 2019 |
| Forty Studio Ltd | Information & communication | 2009 |
| Forward Project Management Limited | Construction | 2015 |
| Four Ashes Management Services Limited | Real estate | 2005 |
| Four Brothers Limited | Hospitality | 2018 |
| Four Mangos Holdings Ltd | Financial services | 2026 |
| Four Paws Explorers Ltd | Administrative & support | 2021 |
| Fourteenconsultants Ltd | Professional & scientific | 2025 |
| FOX Farm Equestrian Horse Transport Limited | Other services | 2023 |
| Foxfarmequestrian Ltd | Agriculture & fishing | 2012 |
| Fractchannel Limited | Information & communication | 2025 |
| Fradley Manor Management Company Limited | Households | 2021 |
| Francesca's Customs Limited | Arts & recreation | 2013 |
| Frankz Services Ltd | Administrative & support | 2019 |