| Faisal Ayub Ltd | Information & communication | 2025 |
| Faith Home Care Ltd | Health & social care | 2020 |
| Faith's Place Ltd | Health & social care | 2018 |
| FAITHFUL2CARE Ltd | Administrative & support | 2024 |
| Faithfulbeautyclinic Ltd | Other services | 2025 |
| Falaq Takeaway Ltd | Hospitality | 2023 |
| Falco Consulting Limited | Information & communication | 2010 |
| Falcon Bowling and Social Club (Chelmsford) Limited (the) | Arts & recreation | 1964 |
| Falcon Bowling Property Limited | Real estate | 2025 |
| Falcon EYE Zero International Ltd | Information & communication | 2026 |
| Falcon EYE Zero Ltd | Construction | 2023 |
| Falcon Management Company Romford Limited | Households | 2007 |
| Falder Matthews Limited | Extraterritorial | 2014 |
| Familia Finance Limited | Financial services | 2019 |
| Families Infocus (Essex) | Information & communication | 1996 |
| Family Digitals Ltd | Wholesale & retail | 2022 |
| Family Home Care Limited | Health & social care | 2009 |
| Family Wholesaler Ltd | Wholesale & retail | 2025 |
| Fanthaisticks Ltd | Hospitality | 2022 |
| Farah Ipswich Ltd | Hospitality | 2024 |
| Fareway Cars Ltd | Transport & logistics | 2019 |
| Fareway Taxis Limited | Transport & logistics | 2008 |
| Farewood Tree Services Ltd | Agriculture & fishing | 2025 |
| Farleigh Hospice | Health & social care | 1982 |
| Farleigh Supplies Limited | Wholesale & retail | 1991 |
| Farm Street Real Estates Advisors Limited | Real estate | 2008 |
| Farmec Solutions Limited | Construction | 2023 |
| Farr O'Neil Limited | Real estate | 2014 |
| Farren Krew Properties Limited | Real estate | 2023 |
| Farrmews Limited | Professional & scientific | 2008 |
| Farrowman Limited | Professional & scientific | 2021 |
| Fass (Duffield) Limited | Wholesale & retail | 2023 |
| Fassaden Expert Ltd | Construction | 2023 |
| Fassuk Ltd | Construction | 2021 |
| Fast Home Properties Ltd | Real estate | 2023 |
| Fast Taxi Limited | Transport & logistics | 2019 |
| Fast Track Consulting Ltd | Professional & scientific | 2022 |
| Fast Track Scaffolding Ltd | Construction | 2024 |
| Fastlane Cricket Limited | Arts & recreation | 2025 |
| Fastline Building Limited | Construction | 2012 |
| Fastsignages Ltd | Manufacturing | 2026 |
| FAT Panda Productions Limited | Other services | 2005 |
| Fata Morgana Ltd | Professional & scientific | 2025 |
| Fatboy Worldwide Limited | Arts & recreation | 2026 |
| Fatmod Records Limited | Wholesale & retail | 2022 |
| Faye's Boutique Limited | Wholesale & retail | 2012 |
| Fayeh Cookery,Hospitality & Educational Services Limited | Hospitality | 2018 |
| Fayre Oaks Home Park Limited | Real estate | 2010 |
| FBB Architects Ltd | Professional & scientific | 2014 |
| FC Highend Ltd | Arts & recreation | 2025 |
| Fcpf Limited | Information & communication | 2011 |
| Feast & Fromage UK Ltd | Hospitality | 2022 |
| Feast Company Catering Limited | Hospitality | 2024 |
| Fedawa Limited | Information & communication | 2016 |
| Fedukovich Ltd | Real estate | 2025 |
| Feel Good Events Ltd | Arts & recreation | 2022 |
| Feel Good Flows Ltd | Arts & recreation | 2024 |
| Feel UN Limited | Wholesale & retail | 2018 |
| Feilin Advisory Ltd | Professional & scientific | 2013 |
| Feilin Tech Limited | Information & communication | 2013 |
| FEL Avionics Limited | Manufacturing | 2019 |
| Feldon Associates Limited | Real estate | 1998 |
| Felix Automotive Ltd | Wholesale & retail | 2023 |
| Felstead Gardening Ltd | Administrative & support | 2014 |
| Femi Isaacs Services Ltd | Health & social care | 2026 |
| FEN Contracts Limited | Other services | 2011 |
| FEN Farming Land Limited | Real estate | 2016 |
| Fenmar Limited | Real estate | 2013 |
| Fennair Flight Services Ltd. | Transport & logistics | 2016 |
| Fennview Ltd | Professional & scientific | 2010 |
| Feno Limited | Health & social care | 2013 |
| Fenton Global Limited | Administrative & support | 2007 |
| Fenton Guitars Ltd | Wholesale & retail | 2024 |
| Ferdinand Football Group Ltd | Arts & recreation | 2021 |
| Ferivet Transport Ltd | Transport & logistics | 2023 |
| Fern Physio Limited | Other services | 2018 |
| Ferndale Holdings Limited | Professional & scientific | 2015 |
| Ferndale Lettings Ltd | Real estate | 2020 |
| Ferrari Healy Limited | Administrative & support | 2007 |
| Ferrers Group Limited | Other services | 2025 |
| Ferrers WOK Limited | Hospitality | 2026 |
| Festii Ltd | Wholesale & retail | 2026 |
| Festival Equipment Hire Limited | Wholesale & retail | 2021 |
| Festival Holdings Limited | Arts & recreation | 2017 |
| Fewkes Transport Services Ltd | Administrative & support | 2019 |
| Feyisara Ltd | Manufacturing | 2025 |
| FFC Sports Ltd | Arts & recreation | 2020 |
| Ffordes (2025) Limited | Financial services | 2025 |
| Ffordes (2026) Limited | Financial services | 2025 |
| Ffordes Investments Limited | Financial services | 2025 |
| Ffordes Trading Limited | Financial services | 2026 |
| FFP Advisory Ltd | Administrative & support | 2020 |
| FG Traders Limited | Wholesale & retail | 2021 |
| FGD Solutions Ltd | Wholesale & retail | 2011 |
| FH Brickwork Ltd | Construction | 2024 |
| FH Care Ltd | Health & social care | 2022 |
| FH Commercial Solutions Limited | Professional & scientific | 2024 |
| FI Procure Tech Ltd | Professional & scientific | 2024 |
| Fibreco Limited | Professional & scientific | 1994 |
| FIDG3T Limited | Administrative & support | 2012 |