| Facade Holdings Limited | Financial services | 2015 |
| Facebooth Party Hire Ltd | Professional & scientific | 2016 |
| Fair Mitre Properties Ltd | Real estate | 2023 |
| Fairground Music Limited | Information & communication | 2025 |
| Falaise Limited | Real estate | 2001 |
| Family Build Bristol Limited | Real estate | 2021 |
| Family Build London Limited | Real estate | 2022 |
| Family Car Centre Ltd | Wholesale & retail | 2019 |
| Family Click Shop Ltd | Wholesale & retail | 2020 |
| Faraway Tree Kindergarten Ltd | Health & social care | 2017 |
| Fareni Lifecare Ltd | Administrative & support | 2022 |
| Farmtech.Investments Ltd | Financial services | 2025 |
| Farrell Csonka Limited | Professional & scientific | 2015 |
| Farvia Consulting Ltd | Information & communication | 2018 |
| Fast Forward Handyman Ltd | Construction | 2018 |
| Fast Fuel Services Holdings Ltd | Financial services | 2025 |
| Fast Fuel Services Ltd | Manufacturing | 2017 |
| FAT Cat Accounting Ltd | Professional & scientific | 2007 |
| Fayrewood Solutions Limited | Manufacturing | 2015 |
| Fazcorp Limited | Professional & scientific | 2013 |
| Façade Homes Limited | Construction | 2023 |
| FCM Electrical Services Ltd | Construction | 2025 |
| FD Guard Ltd | Construction | 2024 |
| FDS Property Limited | Real estate | 2020 |
| Feirn Engines Limited | Wholesale & retail | 2012 |
| Felsted (Cabinet Makers) Limited | Manufacturing | 2002 |
| Feneur London Limited | Wholesale & retail | 2015 |
| Fenn Legal Consultancy Limited | Professional & scientific | 2015 |
| Fenner Garage Motor Works Ltd | Wholesale & retail | 2022 |
| Fenshaw Independent Financial Advisers LLP | | 2018 |
| Fenton's Customer Care Ltd | Construction | 2026 |
| Fergike Limited | Public administration | 2022 |
| Fern Quarters Limited | Real estate | 2021 |
| Ferntree Accounting Services Ltd | Professional & scientific | 2023 |
| Festive Touch Limited | Wholesale & retail | 2023 |
| Festoon Events Ltd | Administrative & support | 2018 |
| Ffroyo Limited | Professional & scientific | 2019 |
| Fieldshelf Ltd | Manufacturing | 2023 |
| Filcare Ltd | Health & social care | 2021 |
| Finance Merchant Limited | Financial services | 2010 |
| Financial and Investment Solutions Ltd | Financial services | 1997 |
| Finch Drive Properties Limited | Real estate | 2002 |
| Finch Seaman Enfield Group Limited | Professional & scientific | 2001 |
| Finchingfield Lavender Limited | Agriculture & fishing | 2022 |
| Finchingfield Windmill CIC | Arts & recreation | 2025 |
| Fine Line Sheet Metal Engineering Limited | Manufacturing | 1988 |
| Fine Lines Consultancy Limited | Professional & scientific | 2021 |
| Fingercounters Consultancy Limited | Administrative & support | 2014 |
| First & Foremost Entertainment Limited | Arts & recreation | 2011 |
| First & Foremost Events Limited | Arts & recreation | 2014 |
| First & Foremost Limited | Arts & recreation | 2019 |
| First Choice Plastering Limited | Construction | 2019 |
| First Class 1 Ltd | Other services | 2025 |
| First Cloud Accounting Ltd | Professional & scientific | 2011 |
| First National Developments Ltd | Construction | 2019 |
| First National Services Ltd | Administrative & support | 1998 |
| FIRST4 Limited | Education | 2008 |
| Firstsound Limited | Administrative & support | 1993 |
| Fitt Heating & Plumbing Ltd | Construction | 2023 |
| Fivefour Engineering Services Limited | Construction | 2018 |
| Fivefour Generator Services Limited | Construction | 2025 |
| Fivefour Group Limited | Financial services | 2023 |
| FJH Properties Limited | Real estate | 2005 |
| Flamborough Street Development Ltd | Construction | 2017 |
| Flawless Flooring Essex Limited | Construction | 2021 |
| Fleeters Limited | Construction | 2018 |
| Flex Data Installations Limited | Information & communication | 2014 |
| Flex Electrical Services Limited | Construction | 2014 |
| Flex Grill Ltd | Hospitality | 2016 |
| Flexa Family Ltd | Information & communication | 2026 |
| Flexcabinetry Limited | Extraterritorial | 2023 |
| Fliptunesmusic X Ltd | Arts & recreation | 2018 |
| Flockfields Academy Limited | Professional & scientific | 2025 |
| Floki Publishing Ltd | Information & communication | 2021 |
| Floodgates Holdings Limited | Real estate | 2023 |
| Floors on Demand Ltd | Construction | 2022 |
| Floral Desire Florist Ltd | Wholesale & retail | 2022 |
| Florence MAE Investments Ltd. | Real estate | 2016 |
| Florence MAE Ltd | Construction | 2014 |
| Florissant Cinq Limited | Financial services | 2023 |
| FLY Cargo Haulage Ltd | Transport & logistics | 2013 |
| FLY ECHO3 UK Limited | Transport & logistics | 2024 |
| Foil Fast Limited | Manufacturing | 2016 |
| Folabisi Ventures Limited | Real estate | 2025 |
| Folia Landscaping Limited | Administrative & support | 2022 |
| Food 4 Schools Limited | Professional & scientific | 2024 |
| Food Buzz Catering Ltd | Hospitality | 2026 |
| FOOD1 Consultancy Ltd | Hospitality | 2013 |
| Football FUN Factory(Community 103) Limited | Arts & recreation | 2023 |
| FOR Life Limited | Education | 1997 |
| Ford Brothers Limited | Real estate | 2024 |
| Foremost Electronics Limited | Wholesale & retail | 1996 |
| Foremost Electronics Technology Group Limited | Manufacturing | 2013 |
| Forest Square Management Limited | Households | 1987 |
| Forever Photos Ltd | Wholesale & retail | 2026 |
| Forill Limited | Administrative & support | 2018 |
| Forkes Security Solutions Ltd. | Administrative & support | 2017 |
| Form Editions Music Co Ltd | Information & communication | 2026 |
| Formal Technology Limited | Information & communication | 2010 |
| Formentera Investment Holdings Limited | Administrative & support | 2018 |