| Fentbim Limited | Information & communication | 2024 |
| Fenwick Studio Limited | Professional & scientific | 2022 |
| Ferguson Residential Ltd | Real estate | 2020 |
| Fern LEA Civil Engineering Limited | | 1986 |
| Fernandez Contract Flooring Ltd | Construction | 2022 |
| Ferns IT Consultancy Limited | Information & communication | 2006 |
| Fero Film Ltd | Information & communication | 2023 |
| Ferrer Dewatering UK Ltd | Construction | 2020 |
| Ferretti Company Ltd | Manufacturing | 2015 |
| Ferro Park Management Company Limited | Households | 1990 |
| Ferry Quay Cafe Limited | Hospitality | 2024 |
| Fertility Genetics LLP | | 2019 |
| Festilo Financial Services Limited | Financial services | 2007 |
| Fetch Finish Ltd | Wholesale & retail | 2025 |
| Fetchapet Limited | Other services | 2015 |
| Feverpitch Games Ltd | Manufacturing | 2024 |
| Ffavs Ltd | Manufacturing | 2017 |
| FFM Facility Ltd | Administrative & support | 2023 |
| FH 95 Ltd | Hospitality | 2025 |
| FH Drywall Ltd | Construction | 2021 |
| FHS Execution Ltd | Financial services | 2021 |
| Fibre Optical Solutions Ltd | Construction | 2025 |
| Fidus Risk & Compliance Partners Limited | Administrative & support | 2016 |
| Fiefdom Ltd | Real estate | 2018 |
| Field Oak Developments Limited | Construction | 2019 |
| Fielders Court Management Company Limited | Households | 1995 |
| Fieldland Flooring Ltd | Construction | 2011 |
| Fields Kitchen Trading Limited | Hospitality | 2021 |
| Fifth Season Styling Limited | Arts & recreation | 2024 |
| FIG Tree Talent Limited | Professional & scientific | 2026 |
| Figaro Floor Designs Limited | Construction | 2014 |
| Fightingfit Store Limited | Wholesale & retail | 2025 |
| Filby Hayes Property Ltd | Real estate | 2024 |
| Fillpots Garden Centre LLP | | 2015 |
| Film Noir Cars Ltd | Transport & logistics | 2020 |
| Finalnumber Property Management Limited | Households | 1993 |
| Finch Plumbing & Heating Limited | Construction | 2010 |
| Find a Counsellor Limited | Professional & scientific | 2019 |
| Fine & Country Colchester Ltd | Real estate | 2018 |
| Fine Foods Catering UK Ltd | Hospitality | 2026 |
| Fine Lines Medical Aesthetics Ltd | Health & social care | 2021 |
| Fineform RC Structures Ltd | Construction | 2026 |
| Finely Sliced Visuals Limited | Professional & scientific | 2023 |
| Finesse Executive Limited | Transport & logistics | 2006 |
| Finest Gardens Ltd | Administrative & support | 2018 |
| Finfixpro Ltd | Professional & scientific | 2025 |
| Fingringhoe Church Green Trust Limited | Real estate | 1980 |
| Finhub Tech UK Ltd | Information & communication | 2020 |
| Finitran Limited | Wholesale & retail | 2024 |
| Finnest.App Limited | Information & communication | 2025 |
| Fintex Ltd | Information & communication | 2019 |
| Fircastle Limited | Health & social care | 2007 |
| Fircastle Medical Limited | Health & social care | 2011 |
| Fire and Ice Pizzeria UK Ltd | Hospitality | 2019 |
| Fire Proofing Ltd | Public administration | 2023 |
| Firebolt Technologies Limited | Information & communication | 2019 |
| Firebrand Creative Limited | Professional & scientific | 2010 |
| Fireforce Ltd | Construction | 2024 |
| Firepoint Property Management Ltd | Real estate | 2021 |
| Firepoint-Uk Limited | Administrative & support | 2006 |
| Firmestrecruitment Ltd | Administrative & support | 2024 |
| Firmin Gardens Management Company Limited | Real estate | 2020 |
| Firmin Transport Planning Ltd | Professional & scientific | 2024 |
| Firouzi Holdings Limited | Real estate | 2023 |
| Firs Chase 1959 Limited | Extraterritorial | 2014 |
| First Central Holdings Limited | Financial services | 2017 |
| First City Homes Limited | Real estate | 2023 |
| First Class Business Solutions (Essex) Ltd | Education | 2024 |
| First Class Repairs Ltd | Wholesale & retail | 2018 |
| First Consult Physio Ltd | Health & social care | 2020 |
| First Leap Consulting Limited | Health & social care | 2021 |
| First Mile Fibre Ltd | Information & communication | 2021 |
| First Point Physio Limited | Health & social care | 2017 |
| First Response Roofing Ltd | Construction | 2026 |
| First Route Logistics Ltd | Transport & logistics | 2023 |
| First Tech Consultants Ltd | Information & communication | 2019 |
| Firstborn 2010 Limited | Financial services | 2010 |
| Firstbuild Ltd | Construction | 2024 |
| Firstclass Safety and Control Ltd | Public administration | 2017 |
| Firstpoint Uk.Com Ltd. | Information & communication | 2002 |
| Firstsite Enterprises Ltd | Wholesale & retail | 2012 |
| Firstsite Limited | Arts & recreation | 1994 |
| Fish & Chicken Ltd | Hospitality | 2021 |
| Fish and More Limited | Hospitality | 2016 |
| Fish Cart Ltd | Wholesale & retail | 2025 |
| Fishable Lakes Limited | Agriculture & fishing | 2021 |
| Fisher Brickwork Ltd | Construction | 2020 |
| Fisher Ductwork Services Ltd | Construction | 2017 |
| Fisher Heating & Maintenance Limited | Construction | 2021 |
| Fisher Jones Greenwood LLP | | 2003 |
| Fisher Wealth Services Limited | Financial services | 2013 |
| Fisherscottsupplies Ltd | Wholesale & retail | 2026 |
| Fishies Cuisine Limited | Hospitality | 2022 |
| Fishing Particles Ltd | Wholesale & retail | 2024 |
| Fitc Academy Group LLP | | 2023 |
| Fitch & Fitch Ltd | Administrative & support | 2013 |
| Fitch & Fitch Wealth Limited | Administrative & support | 2023 |
| Fitch Financial Limited | Administrative & support | 2014 |
| Fitnessory Ltd | Wholesale & retail | 2020 |
| Fittek Limited | Information & communication | 2023 |