| Fiddes & Co Limited | Other services | 2022 |
| Fidelity Transport & Driver Services Ltd | Transport & logistics | 2023 |
| Fidescare Limited | Health & social care | 2024 |
| Fieba Limited | Financial services | 2016 |
| Field & Moyes Property Ltd | Real estate | 2026 |
| Field and Forge Group Ltd | Professional & scientific | 2026 |
| Field of Dreams Farm Limited | Agriculture & fishing | 2017 |
| Field Partners Limited | Professional & scientific | 2019 |
| Fieldbourne Property Ltd | Real estate | 2026 |
| Fiesta Blinds Limited | Manufacturing | 2005 |
| Fifty Four Capital Ltd | Real estate | 2023 |
| Figure Sense Ltd | Professional & scientific | 2010 |
| File My Bloods Ltd | Information & communication | 2026 |
| Filmhaus (Cinemas) Limited | Information & communication | 2015 |
| Filmhaus (Media Group) Ltd | Information & communication | 2019 |
| Filwood Limited | Professional & scientific | 2018 |
| Finaccom Limited | Information & communication | 2014 |
| Final Stop Rescue CIC | Agriculture & fishing | 2024 |
| Financial Implementation Solutions Limited | Professional & scientific | 2010 |
| Financial Visualisation Limited | Information & communication | 2015 |
| Financsory Ltd | Professional & scientific | 2025 |
| Finch Home Interiors Ltd | Wholesale & retail | 2025 |
| Finch Services Limited | Construction | 2016 |
| Finconnect Ltd | Administrative & support | 2010 |
| Fincox Ltd | Real estate | 2023 |
| Find a Way: Psychological Services CIC | Health & social care | 2024 |
| Find My Finance Ltd | Financial services | 2026 |
| Find Pause Ltd | Health & social care | 2024 |
| Find Your Ikigai Ltd | Financial services | 2023 |
| Findasister CIC | Education | 2025 |
| Finding Eco Limited | Other services | 2025 |
| Finematics Technologies Ltd | Information & communication | 2020 |
| Finhubb Ltd | Professional & scientific | 2020 |
| Finicks Properties Ltd | Real estate | 2023 |
| Finishra Material Systems Limited | Manufacturing | 2026 |
| Finlet Properties Ltd | Real estate | 2026 |
| Finn Associates Limited | Professional & scientific | 2024 |
| Finnbro Force Ltd | Wholesale & retail | 2018 |
| Finohost Limited | Information & communication | 2023 |
| Finplanpro UK Ltd | Financial services | 2024 |
| Fintex Fabrics Limited | Manufacturing | 2025 |
| Fiori Luxe Ltd | Wholesale & retail | 2024 |
| Fiortech Recruitment Group Limited | Administrative & support | 2024 |
| Firbank House Ltd | Real estate | 2026 |
| Fire Bandit Limited | Hospitality | 2022 |
| Fire Right Limited | Construction | 2022 |
| Fireworks Echo Ltd | Wholesale & retail | 2025 |
| Firsalryd Limited | Health & social care | 2014 |
| First Accounting Services Ltd | Professional & scientific | 2020 |
| First Call Group Limited | Other services | 2015 |
| First Class Cars (FCC) Ltd | Wholesale & retail | 2004 |
| First Defense Limited | Wholesale & retail | 2024 |
| First for Patients and People Ltd | Health & social care | 2025 |
| First Group (UK) Co., Limited | Financial services | 2017 |
| First Light Outreach Limited | Information & communication | 2021 |
| First Rite Studio Limited | Administrative & support | 2026 |
| First Start Diagnostics Ltd | Wholesale & retail | 2026 |
| First Step Playgroup Limited | Education | 2013 |
| First Stop Cars Limited | Wholesale & retail | 2024 |
| First Stop Travel (East Anglia) Limited | Transport & logistics | 2009 |
| First Thought IP Limited | Professional & scientific | 2006 |
| First Tier Scaffolding Limited | Construction | 2021 |
| First Word Tree Productions Limited | Information & communication | 2017 |
| Firstfix Heating Ltd | Construction | 2020 |
| Firstsay Publishing Ltd | Information & communication | 2026 |
| Fisevalue Limited | Professional & scientific | 2024 |
| Fishblue Limited | Hospitality | 2021 |
| Fisher & Partners Ltd | Other services | 2025 |
| Fisher Property & Developments Limited | Real estate | 2021 |
| Fiso Limited | Arts & recreation | 2000 |
| Fist Club Wrestling Ltd | Arts & recreation | 2026 |
| Fit OUT Four Four Limited | Construction | 2026 |
| Fit ZA Fajt Ltd | Education | 2025 |
| Fitter Together Ltd | Other services | 2023 |
| Fitting Attires Limited | Manufacturing | 2025 |
| Fitzroy Systems Limited | Information & communication | 1994 |
| Five Fifths Group Limited | Professional & scientific | 2024 |
| Five Wells Education Ltd | Education | 2026 |
| Fiveways Garage Ltd | Wholesale & retail | 2019 |
| FIX@ Limited | Wholesale & retail | 2026 |
| Fixbrook Consultancy Limited | Information & communication | 1989 |
| Fixlendra Issue Flow Ltd | Information & communication | 2026 |
| Fixshtel Ltd | Information & communication | 2025 |
| Fixtrd Ltd | Arts & recreation | 2026 |
| FIZ Consultancy Limited | Professional & scientific | 2016 |
| Fizmo Solutions Limited | Wholesale & retail | 2025 |
| FJ Leisure Limited | Hospitality | 2022 |
| Fjelltopp Ltd | Professional & scientific | 2019 |
| Flack Family Thatching Services Ltd | Construction | 2024 |
| Flagship AV Ltd | Information & communication | 2024 |
| Flagship Football Advisory Ltd | Arts & recreation | 2026 |
| Flaminia Limited | Administrative & support | 2002 |
| Flanak Cloud Solutions Ltd | Information & communication | 2023 |
| Flat Glass Solutions Limited | Administrative & support | 2014 |
| Flatland Management Ltd | Real estate | 2024 |
| Flavour Chain Ltd | Wholesale & retail | 2020 |
| Flavour Fellas Limited | Information & communication | 2025 |
| FLB Consulting Ltd | Professional & scientific | 2026 |
| Fletch Customs Ltd | Wholesale & retail | 2026 |
| Fleur DE Luxe Ltd | Wholesale & retail | 2026 |