| Fess Projects Limited | Manufacturing | 2023 |
| Fess Properties Ltd | Real estate | 2025 |
| Fess Recruitment Ltd | Administrative & support | 2024 |
| Fetch Pet Sitting Services Ltd | Administrative & support | 2025 |
| FFE SPV 2 Limited | Financial services | 2023 |
| FFE SPV Limited | Financial services | 2018 |
| FFL Properties Limited | Extraterritorial | 2024 |
| FGB Trading Ltd | Administrative & support | 2026 |
| FGE Projects Ltd | Construction | 2018 |
| FH Security Ltd | Other services | 2024 |
| Fibe Transport Ltd | Transport & logistics | 2024 |
| Fibre Environmental Ltd | Water & waste | 2017 |
| Fibrely Limited | Information & communication | 2012 |
| Fidelity Audio Limited | Manufacturing | 2020 |
| Fiduworld Group Ltd | Administrative & support | 2016 |
| Field Commercial Limited | Real estate | 2021 |
| Field Design Associates Ltd | Administrative & support | 2008 |
| Field Places Limited | Real estate | 2016 |
| Field Villa Limited | Administrative & support | 2024 |
| Fields END Consulting Limited | Administrative & support | 2008 |
| Fields of Change Limited | Professional & scientific | 2015 |
| Fieldsend Enterprises Limited | Manufacturing | 2001 |
| Fieldstar Network Limited | Other services | 2010 |
| Fifius Fofius Limited | Arts & recreation | 2019 |
| FIFTY3 Design Ltd | Arts & recreation | 2017 |
| FIG Tree Blossom Ltd | Administrative & support | 2023 |
| Figa Z Makiem Ltd | Manufacturing | 2023 |
| Fight for Good CIC | Administrative & support | 2018 |
| FIH Media Ltd | Professional & scientific | 2025 |
| Fiitstyle Ltd | Extraterritorial | 2017 |
| Fika Coffee and Wine Lounge Ltd | Wholesale & retail | 2019 |
| Fildes Roofing Limited | Construction | 1988 |
| Filip Transport Experts Ltd | Transport & logistics | 2014 |
| Filla (Askern) Ltd | Hospitality | 2019 |
| Filling the GAP Ltd | Health & social care | 2022 |
| Filmar Trans Ltd | Transport & logistics | 2022 |
| Fima International Engineering Consulting Ltd | Professional & scientific | 2016 |
| Final Boss Music Ltd | Information & communication | 2024 |
| Final Cuts Barber Shop Ltd | Other services | 2025 |
| Final Straight Ltd | Wholesale & retail | 2024 |
| Finance for Enterprise Limited | Financial services | 1985 |
| Finance Loans Limited | Financial services | 2021 |
| Finance Matters (UK) Limited | Administrative & support | 2012 |
| Financial Funding Limited | Financial services | 2014 |
| Financial Leader Limited | Extraterritorial | 2015 |
| Financial Transformers Ltd | Financial services | 2024 |
| Financing This Way Limited | Professional & scientific | 2024 |
| Finchfield Consultants Ltd | Professional & scientific | 2023 |
| Finchpalm Environmental Limited | Administrative & support | 2017 |
| Finchpalm Limited | Construction | 2013 |
| Find Your Voice C.I.C. | Education | 2017 |
| Finders Keep Beauty Ltd | Other services | 2026 |
| Findlays Electrical Limited | Construction | 2010 |
| Finer Lives Ltd | Administrative & support | 2017 |
| Finger Fittings Limited | Manufacturing | 2021 |
| Fingerprint Properties Limited | Real estate | 2010 |
| Finishing Touch Renovation Ltd | Construction | 2021 |
| Finley TM Ltd | Construction | 2024 |
| Finn Keenan Limited | Arts & recreation | 2019 |
| Finningley Scaffolding Limited | Construction | 2007 |
| Finnytoe Limited | Professional & scientific | 2013 |
| Finovus Ltd | Information & communication | 2026 |
| Finsafe Solution Limited | Information & communication | 2024 |
| Finstop Limited | Administrative & support | 1996 |
| Fiona Trimingham Ltd | Professional & scientific | 2017 |
| Fire Couriers Ltd | Transport & logistics | 2021 |
| Fire International Limited | Wholesale & retail | 1993 |
| Fire LOG Book Ltd | Professional & scientific | 2024 |
| Fire Risk Consulting Limited | Public administration | 2014 |
| Fire WOK Foods Ltd | Hospitality | 2026 |
| Fire-Craft (Doncaster) Limited | Wholesale & retail | 1955 |
| Fired UP Consulting Limited | Professional & scientific | 2023 |
| Firefly Cancer Awareness and Support Limited | Other services | 2009 |
| Fireholt FP Limited | Public administration | 2024 |
| Fireholt Ltd | Construction | 2026 |
| Firejett Limited | Construction | 2016 |
| Firesec (Doncaster) UK Limited | Other services | 2017 |
| Fireworks Megastore Limited | Wholesale & retail | 2016 |
| Firmus Interiors Ltd | Construction | 2019 |
| Firsbyway Working Dogs Limited | Other services | 2017 |
| First 4 Care Limited | Health & social care | 2008 |
| First 4 Construction Ltd | Construction | 2015 |
| First AID Schools Ltd | Public administration | 2022 |
| First Choice Properties (UK) Ltd | Construction | 2006 |
| First Ciao Pizza Ltd | Hospitality | 2025 |
| First Class Design Limited | Professional & scientific | 2009 |
| First Degree Engineering Consulting Ltd | Professional & scientific | 2015 |
| First Fires Games Ltd | Information & communication | 2026 |
| First Global Training Limited | Professional & scientific | 2011 |
| First Group Holdings and Investments UK Ltd | Financial services | 2017 |
| First Impressions Yorkshire Limited | Other services | 2016 |
| First Logistics Limited | Transport & logistics | 2023 |
| First Move Europe Limited | Other services | 2022 |
| Firstcare (Doncaster) Limited | Wholesale & retail | 2012 |
| Firstcare (Mansfield) Limited | Wholesale & retail | 2012 |
| Firstcare (UK) Limited | Wholesale & retail | 2010 |
| Firstcare Consultants Limited | Professional & scientific | 2023 |
| Firstcare Derby Ltd | Wholesale & retail | 2021 |
| Firstcare Estates Limited | Real estate | 2022 |
| Firstcare Newgate 2 Limited | Financial services | 2024 |