| Footsteps Design Limited | Professional & scientific | 2013 |
| FOR Actors Ltd | Professional & scientific | 2024 |
| FOR Colchester Limited | Hospitality | 2017 |
| Foragemedia Ltd | Professional & scientific | 2022 |
| Foran Solutions Ltd | Professional & scientific | 2014 |
| Force Healthcare Ltd | Wholesale & retail | 2018 |
| Forclaz S&T Ltd | Information & communication | 2015 |
| Ford Mews Management Company Limited | Households | 2015 |
| Ford Retail Group Limited | Wholesale & retail | 1969 |
| Ford Retail Limited | Wholesale & retail | 1923 |
| Ford Training Services Limited | Administrative & support | 2007 |
| Fore Street Docks Ltd | Real estate | 2024 |
| Foremost Financial Management Limited | Financial services | 2025 |
| Foremost U.K. Limited | Professional & scientific | 1994 |
| Forensic Consultancy Solutions Limited | Information & communication | 2018 |
| Forest United (1973) Youth Football Club Limited | Arts & recreation | 2015 |
| Forestmount Ltd | Professional & scientific | 2012 |
| Forethought Productions Limited | Information & communication | 2014 |
| Forge 44 Group Ltd | Construction | 2024 |
| Forge and Frame Marketing Ltd | Professional & scientific | 2025 |
| Forge Fit Pro Ltd | Manufacturing | 2024 |
| Forge Fitness & Nutrition Ltd | Health & social care | 2025 |
| Forged & Gems Limited | Manufacturing | 2025 |
| Forgewell Engineering Ltd | Construction | 2025 |
| Forgione Group Limited | Financial services | 2024 |
| Form Pools Limited | Construction | 2020 |
| Format Wines Ltd | Wholesale & retail | 2020 |
| Formica Shop Fitting Ltd | Construction | 2013 |
| Formosa Events Limited | Hospitality | 2019 |
| Forres Freehold Management Limited | Professional & scientific | 2005 |
| Forrester Park Limited | Arts & recreation | 1992 |
| Fortis Network Security Ltd | Information & communication | 2026 |
| Fortitude Ipswich Limited | Arts & recreation | 2023 |
| Fortress Doors - the Rolling Door Specialist Limited | Administrative & support | 2021 |
| Fortress Property Management Ltd | Real estate | 2025 |
| Fortune House (Colchester) Limited | Hospitality | 2016 |
| Fortysix Group Ltd | Administrative & support | 2020 |
| Forum Design & Manufacturing Limited | Manufacturing | 1995 |
| Forza Financial Partners Ltd | Financial services | 2025 |
| Fosker Holdings Ltd | Wholesale & retail | 2010 |
| Foster Contracting (Geotechnics) Limited | Construction | 2024 |
| Foster Contracting (North) Limited | Construction | 2017 |
| Foster Contracting Holdings Limited | Administrative & support | 2017 |
| Foster Contracting Limited | Construction | 1911 |
| Fosters Financial Limited | Professional & scientific | 2014 |
| Found. Preloved Ltd | Wholesale & retail | 2026 |
| Foundling Limited | Professional & scientific | 2018 |
| Foundry Place (Grundisburgh) Management Company Limited | Households | 2016 |
| Fountaineers Limited | Administrative & support | 1996 |
| Four Bees Ltd | Manufacturing | 2013 |
| Four Colnes - IT Takes a Village C.I.C. | Wholesale & retail | 2022 |
| Fourth State Ltd | Information & communication | 2015 |
| Fowey Harbour Ltd | Real estate | 2020 |
| Fowler Housing Investments Ltd | Real estate | 2022 |
| Fowler's Construction Limited | Construction | 2024 |
| FOX and Pheasant Land Limited | Agriculture & fishing | 2016 |
| FOX and Pheasant Limited | Real estate | 2002 |
| FOX Classics Limited | Wholesale & retail | 2024 |
| Fox's Chandleries Limited | Wholesale & retail | 2000 |
| Fox's Holdings Limited | Professional & scientific | 2006 |
| Fox's Marina Ipswich Limited | Manufacturing | 1985 |
| Foxdata Ltd | Professional & scientific | 2015 |
| Foxes Development Ltd | Construction | 2025 |
| Foxes Rural Limited | Professional & scientific | 2018 |
| Foxglove Place (Felsted) Management Company Limited | Households | 2024 |
| Foxgrove Gardens Residents Company Limited | Households | 2006 |
| Foxstone Limited | Real estate | 2018 |
| FPI (Kelvedon) Limited | Construction | 2025 |
| FPI (Nazeing) Limited | Real estate | 2004 |
| Fppg Ltd | Real estate | 2022 |
| FPS Contracts Ltd | Professional & scientific | 2022 |
| FPT Builders Ltd | Construction | 2026 |
| Fra&Jr Ltd | Professional & scientific | 2024 |
| Fraby Healthcare Ltd | Health & social care | 2016 |
| Fragrance Samples UK Limited | Wholesale & retail | 2017 |
| Fragranceos Ltd | Information & communication | 2025 |
| Frame Unique Ltd | Wholesale & retail | 2021 |
| Framewerks Picture Framing Ltd | Administrative & support | 2009 |
| Francis Access Hire Ltd | Construction | 2017 |
| Francis Terry and Associates Ltd | Professional & scientific | 2016 |
| Frank & Sons Electrical Limited | Manufacturing | 2017 |
| Frank Martin & Sons Limited | Agriculture & fishing | 1949 |
| Frank Raymond's Ltd | Hospitality | 2014 |
| Frank Thomas Plumbing, Heating and Construction Limited | Administrative & support | 2021 |
| Franke Racewear Ltd | Wholesale & retail | 2021 |
| Franklins Group Limited | Wholesale & retail | 2002 |
| Franklins Training Ltd | Education | 2020 |
| Frankly Darling Ltd | Wholesale & retail | 2025 |
| Franknox Holdings Group Limited | Financial services | 2026 |
| Franknox Limited | Construction | 2023 |
| Frankora Limited | Construction | 2026 |
| Franks Motor Company Limited | Wholesale & retail | 2024 |
| Franks Motorcycles Limited | Wholesale & retail | 2020 |
| Franks Service Centre Limited | Wholesale & retail | 2024 |
| Franks Services Limited | Wholesale & retail | 2022 |
| Frankway Property Ltd | Real estate | 2023 |
| Frankwood Property Maintenance Ltd | Water & waste | 2019 |
| Frantronics Development Ltd | Information & communication | 2022 |
| Fraser Technical Limited | Information & communication | 2016 |
| Frating Farm Limited | Construction | 2025 |