| Flip Computing Ltd | Education | 2023 |
| FLO Plumbing & Heating Ltd | Construction | 2025 |
| Flora Associates Ltd | Construction | 2024 |
| Florence Bell Gallery Limited | Wholesale & retail | 2021 |
| Florence Consult Limited | Health & social care | 2018 |
| Florence Nightingale AID in Sickness Trust | Administrative & support | 2014 |
| Florent Marrou Ltd | Professional & scientific | 2017 |
| Florida Court Limited | Households | 1995 |
| Florose Plumbing Limited | Construction | 2018 |
| Flourish IT Limited | Information & communication | 2011 |
| Flourish Landscapes & Garden Maintenance Ltd | Administrative & support | 2015 |
| Flourish Mabel Ltd | Health & social care | 2022 |
| Flourish Overhauls & Garden Maintenance Ltd | Administrative & support | 2015 |
| Flourishing Horizons Community Interest Company | Health & social care | 2025 |
| Flourishing Property Management Limited | Real estate | 2023 |
| Flower Fresh Cleaning Ltd | Other services | 2020 |
| Flowfleet Limited | Wholesale & retail | 1990 |
| Flowstate Media Productions Ltd | Professional & scientific | 2025 |
| Flowstate Records Limited | Wholesale & retail | 2022 |
| Flowtech Services Ltd | Water & waste | 2003 |
| Fluid Pictures Limited | Professional & scientific | 2005 |
| Flush-Line Ltd | Construction | 2021 |
| Flutterby X Ltd | Wholesale & retail | 2025 |
| FLY Fast Further First Limited | Transport & logistics | 2022 |
| Flyser Ltd | Professional & scientific | 2018 |
| FME Property Solutions Ltd | Construction | 2026 |
| FMP Property Investments Limited | Hospitality | 2021 |
| FMS Mechanical Ltd | Construction | 2026 |
| Foam on Tour Ltd | Arts & recreation | 2024 |
| Focus Building Services Limited | Construction | 2008 |
| Focus Educational Consulting Services Limited | Administrative & support | 2014 |
| Focus Skills Limited | Education | 2005 |
| Focus UK Trading Ltd | Wholesale & retail | 2025 |
| Fodmarket Ltd | Wholesale & retail | 2017 |
| Follett Solutions Ltd | Transport & logistics | 2023 |
| Fones Direct Ltd | Wholesale & retail | 2019 |
| Food Tour Europe Ltd | Hospitality | 2022 |
| Foodies Heaven Limited | Hospitality | 2024 |
| Foot Revival Limited | Health & social care | 2006 |
| Football Sixes UK Ltd | Arts & recreation | 2025 |
| Football- Boy.Com Ltd | Information & communication | 2018 |
| Forage Botanicals Limited | Health & social care | 2014 |
| Forbes Performance Coaching Ltd | Arts & recreation | 2021 |
| Forbs Properties Limited | Real estate | 2022 |
| Foreign! Limited | Arts & recreation | 2023 |
| Foremost Consultants Limited | Administrative & support | 2003 |
| Forest Lawns Residents Association Limited | Households | 2013 |
| Forester Holdings (Europe) Limited | Professional & scientific | 1995 |
| Forester Life Limited | Financial services | 1994 |
| Forever Your Puppy Ltd | Administrative & support | 2022 |
| Forfar Renewables Battery Limited | Construction | 2021 |
| Forma Petts Wood Ltd | Hospitality | 2026 |
| Formahaus Ltd | Wholesale & retail | 2025 |
| Formuleyes Ltd | Wholesale & retail | 2019 |
| Forrest Capital Solutions Ltd | Other services | 2017 |
| Forschell Properties Limited | Households | 1972 |
| Forte Concierge Limited | Other services | 2016 |
| Fortey Limited | Professional & scientific | 1998 |
| Fortune 4 Real Estate Limited | Financial services | 2025 |
| Forty Eight Blenheim Crescent Limited | Households | 1981 |
| Forty Eight Valley Road Limited | Households | 1978 |
| Forward Teaching Limited | Administrative & support | 2016 |
| Fost & Co Developments Limited | Construction | 2020 |
| Fost & Co Limited | Construction | 2017 |
| Foster and Coleman Limited | Professional & scientific | 2019 |
| Foster Bryce Limited | Information & communication | 2001 |
| Found ALL Limited | Administrative & support | 2018 |
| Found Design Limited | Administrative & support | 2007 |
| Found Hired Limited | Administrative & support | 2019 |
| Foundationstones Resources Ltd | Information & communication | 2019 |
| Founders House (London) RTM Company Limited | Real estate | 2025 |
| Fountain Court (Freehold) Limited | Households | 2003 |
| Fountain Court (Sydenham) Limited | Households | 2001 |
| Four Corners Bookkeeping Limited | Professional & scientific | 2019 |
| Four Freelands Road Limited | Households | 1978 |
| Four Keen Inns Bromley Ltd | Hospitality | 2018 |
| Four Keen Inns Greenwich Ltd | Hospitality | 2018 |
| Four Seasons Cuisine (Chislehurst) Ltd | Hospitality | 2012 |
| Four Seasons Cuisine (Masonic Events) Ltd | Hospitality | 2025 |
| Four Seasons Cuisine (Shirley Park) Ltd | Hospitality | 2019 |
| Four Seasons Cuisine (Sidcup Masonic) Ltd | Hospitality | 2024 |
| Four Seasons Cuisine (West Kent) Ltd | Hospitality | 2024 |
| Four Seasons Decoration Limited | Other services | 2022 |
| Fourcees Trading Limited | Wholesale & retail | 1995 |
| Fourfour Productions Ltd | Administrative & support | 2008 |
| Fourhayes Limited | Households | 1993 |
| Fourth Estate Creative Ltd | Manufacturing | 2018 |
| FOX and Castle Ltd | Transport & logistics | 2019 |
| FOX Hill (Upper Norwood) Managements Limited | Households | 1971 |
| FOX in the Box Events Ltd | Hospitality | 2025 |
| FOX Silver Limited | Manufacturing | 1993 |
| Foxbury Allotments Limited | Arts & recreation | 2020 |
| Foxes Dale Residents Association Limited | Households | 1961 |
| Foxgrove Consultants Ltd | Real estate | 2024 |
| Foxgrove Court Management Limited | Households | 1970 |
| Foxgrove Heights Management Limited | Households | 2005 |
| Foxgrove Investments Limited | Real estate | 2018 |
| Foxwood Chase Residents Company Limited | Households | 1999 |
| FOY Site Services Ltd | Construction | 2019 |
| Frampton's Ground Maintenance Ltd | Real estate | 2018 |