| F1 47 Warwick Road Ltd | Real estate | 2024 |
| F1 Accountancy Services Ltd | Professional & scientific | 2019 |
| F2 47 Warwick Road Ltd | Real estate | 2024 |
| F2-WCR Limited | Information & communication | 2017 |
| FAB8 Ltd | Administrative & support | 2019 |
| Fabgyft Ltd | Wholesale & retail | 2019 |
| Fabula Ltd | Information & communication | 2010 |
| Facebetter Limited | Households | 1986 |
| Fairfield Cleaning Limited | Administrative & support | 2026 |
| Fairfield Investments (London) Limited | Construction | 2007 |
| Fairgreen Court Management Limited | Administrative & support | 1995 |
| Fairkin Holdings Limited | Administrative & support | 2021 |
| Fairline Ltd | Real estate | 2017 |
| Fairmead Court (Whetstone) Limited | Households | 2002 |
| Fairview Facilities Management Ltd | Administrative & support | 2018 |
| Fairway Court Property Management Co.Limited | Households | 1965 |
| Fairway Heating & Plumbing Services Ltd | Construction | 2017 |
| Faith & Love Nursery Ltd | Education | 2021 |
| Faithful Freehold Limited | Administrative & support | 2022 |
| Fame Global Ventures Limited | Professional & scientific | 2023 |
| Familia Ltd | Administrative & support | 2025 |
| Family Circle (Consultancy) Limited | Administrative & support | 2013 |
| Family Support Practise Limited | Education | 2010 |
| Family Support Properties Ltd | Real estate | 2016 |
| Fanfare Limited | Information & communication | 2012 |
| Fanu Limited | Manufacturing | 2017 |
| Farashkam Ltd | Health & social care | 2014 |
| Farcon Properties Limited | Construction | 2012 |
| Farfrom Limited | Arts & recreation | 2013 |
| Fargo Limited | Financial services | 2006 |
| Farlan Automotive Limited | Wholesale & retail | 2020 |
| Farlows Leisure LLP | | 2014 |
| Farmes View Ltd | Wholesale & retail | 2026 |
| Farmhouse Pizza (South Oxhey) Ltd | Hospitality | 2019 |
| Farmhouse Pizza New Barnet Limited | Hospitality | 2025 |
| Farralith CIC | Information & communication | 2026 |
| Farriery Tuition Ltd | Education | 2022 |
| Farya Barlas Ltd | Professional & scientific | 2024 |
| Fashion Course Equipment Limited | Extraterritorial | 2018 |
| Fashion Edge UK Limited | Transport & logistics | 2009 |
| Fashion Exchange (UK) Limited | Wholesale & retail | 2015 |
| Fast Food Barnet Limited | Hospitality | 2026 |
| Fastepc.Co.Uk Ltd | Other services | 2017 |
| Fastxe Ltd | Information & communication | 2026 |
| Fatfacades Ltd | Professional & scientific | 2012 |
| Faulkner Family Investments Ltd | Financial services | 2021 |
| Faves Limited | Real estate | 2025 |
| Faynes Developments Sandy Ltd | Construction | 2025 |
| FB & H Co Ltd | Health & social care | 2022 |
| FB5 Sgpt Ltd | Arts & recreation | 2017 |
| FBM Holdings Limited | Water & waste | 2015 |
| FBM Metals (UK) Limited | Water & waste | 1975 |
| FBW2022 Limited | Real estate | 2022 |
| FC Exports West Africa Limited | Wholesale & retail | 2014 |
| FCM Bioenergy Limited | Other services | 2015 |
| FCN CLEANING24 Ltd | Real estate | 2020 |
| FCS West Africa Limited | Professional & scientific | 2014 |
| FD Consulting Ltd | Financial services | 2017 |
| FDO Trade Ltd | Professional & scientific | 2007 |
| FE Maintenance Ltd | Construction | 2021 |
| Fear Free Life CIC | Education | 2023 |
| Featherbeats Limited | Wholesale & retail | 2015 |
| Feature Property Group Limited | Real estate | 2017 |
| Febring Limited | Professional & scientific | 2026 |
| Federal Motors England Ltd. | Manufacturing | 2004 |
| Feel Good Fitness Group Training Ltd | Health & social care | 2024 |
| Feel the Difference Limited | Administrative & support | 2001 |
| Feeling Social Group Limited | Health & social care | 2022 |
| Feetrac UK Ltd | Manufacturing | 2009 |
| Felix Grove Limited | Real estate | 2017 |
| Fells Ltd | Professional & scientific | 2020 |
| FEM & V Limited | Real estate | 2026 |
| Femiluxe Hair & Beauty Ltd | Other services | 2020 |
| Fennes Fishing Ltd | Agriculture & fishing | 2022 |
| Fennes Shoot School Ltd | Arts & recreation | 2014 |
| Fennland Limited | Households | 1980 |
| Fenrock Capital Limited | Professional & scientific | 2025 |
| Fens Developments Limited | Construction | 2019 |
| Fenton Financial Consulting Ltd | Professional & scientific | 2023 |
| Ferguson & Ferguson the Online Tutoring Co Limited | Education | 2019 |
| Fermal LLP | | 2006 |
| Fermauk Ltd | Transport & logistics | 2017 |
| Ferncroft Properties Limited | Real estate | 2005 |
| Fernhall Management RTM Limited | Households | 2007 |
| Fernwood RTM Company Limited | Households | 2009 |
| Ferryfield Developments Ltd | Extraterritorial | 2011 |
| Festi Bars Limited | Hospitality | 2013 |
| FFF Antonio Soares Limited | Arts & recreation | 2025 |
| FGS Healthcare Ltd | Health & social care | 2022 |
| FHW Ventures Ltd | Information & communication | 2026 |
| Field Fixers Limited | Agriculture & fishing | 2025 |
| Field Matters Limited | Administrative & support | 2015 |
| Fieldbyte Limited | Real estate | 2000 |
| Fifi Laroux Limited | Wholesale & retail | 2019 |
| Fifth AGE Equity Ltd | Financial services | 2025 |
| FIG & Olive Ltd | Real estate | 2023 |
| FIG-1 (2000) Limited | Arts & recreation | 1999 |
| Fight 2 Fit Ltd | Arts & recreation | 2012 |
| Fight Factory Legacy Ltd | Arts & recreation | 2019 |
| Fileacross Company Limited | Wholesale & retail | 1993 |