| Falcons Court (Kesgrave) Management Company Limited | Households | 2005 |
| Falsely Accused Ltd | Professional & scientific | 2016 |
| Family Anchor Limited | Administrative & support | 2024 |
| Farm Factory Limited | Arts & recreation | 2015 |
| Fast-Track Ironmongery Limited | Wholesale & retail | 2006 |
| Fastmove Ltd | Financial services | 2023 |
| Fatum Retail Ltd | Wholesale & retail | 2021 |
| Favortech Ltd. | Other services | 2014 |
| Favour Care Home Limited | Health & social care | 2025 |
| Fayrewai Ltd | Professional & scientific | 2025 |
| FC Eleven Media Limited | Professional & scientific | 2024 |
| Feasible Automotive Solutions Limited | Administrative & support | 2002 |
| Fellowes Plain Homes (NO.2) Management Company Limited | Households | 2003 |
| Felmore Park Residents Association Limited | Households | 1983 |
| Fencewell Landscapes Ltd | Administrative & support | 2022 |
| Fenchurch Facilities Company Limited | Administrative & support | 2018 |
| Fenman Gardens (Two) Management Company Limited | Households | 1994 |
| Fibron BX Limited | Manufacturing | 1987 |
| Fibs Electrical Compliance Ltd | Manufacturing | 2019 |
| Field Top Court Management Company Ltd | Households | 2013 |
| Fieldings Road Limited | Construction | 2015 |
| Fields END Management Company Limited | Households | 2006 |
| Filter X Limited | Wholesale & retail | 2026 |
| Finalytiq Limited | Financial services | 2013 |
| Finance Nexus Limited | Financial services | 2023 |
| Findon Avenue Residents Association Ltd | Households | 2022 |
| Fineve Ltd | Other services | 2016 |
| Finleyvp Ltd | Information & communication | 2026 |
| Finnacc (UK) Ltd. | Professional & scientific | 2006 |
| Fircroft (Englefield Green) Management Company Limited | Households | 2005 |
| Fire Engineering Solutions Limited | Construction | 2014 |
| Firecheck Sprinklers Limited | Construction | 2013 |
| First Bloomsbury Mews Management Company (Islington) Limited | Households | 1989 |
| First Granite Ltd | Construction | 2013 |
| First Lyntons Management Company (Southwark) Limited | Households | 1988 |
| First Octagon Management Company Limited | Households | 1994 |
| First Shirewood Management Company Limited | Households | 1994 |
| First Stop Holdings Ltd | Wholesale & retail | 2018 |
| Fitness Focus Limited | Arts & recreation | 2004 |
| Fitzgibbon Travel Limited | Administrative & support | 2019 |
| FL Investments Ltd | Professional & scientific | 2009 |
| Flame Tech Limited | Construction | 2016 |
| Fleet & Smith (UK) Ltd | Professional & scientific | 2003 |
| Fleetwood Harbour Management Company Limited | Households | 2010 |
| Fletch D B Limited | Professional & scientific | 2015 |
| Flexiblecarhire.Com Limited | Administrative & support | 2007 |
| Flexicontact Limited | Information & communication | 2010 |
| Flopsy Wood Community Project CIC | Health & social care | 2022 |
| Florin Court Limited | Households | 2004 |
| Flow Leak Detection Limited | Construction | 2024 |
| FLT Bearings Limited | Wholesale & retail | 2004 |
| Fluffy FOX Studios Limited | Information & communication | 2021 |
| Fluid MEP Services Ltd | Administrative & support | 2026 |
| Flush Builders Ltd | Construction | 2021 |
| Flux Engine Ltd | Information & communication | 2018 |
| FM2G Construction Limited | Construction | 2020 |
| FM2G Maintenance Solutions Limited | Construction | 2020 |
| Fmac Group Limited | Energy | 1992 |
| Focused Landscapes Limited | Administrative & support | 2015 |
| Fogal UK Limited | Construction | 1999 |
| Fogmaker UK Ltd | Extraterritorial | 2016 |
| Foley Builders Ltd | Construction | 2014 |
| Ford Park (the Beeches) Management Company Limited | Real estate | 2016 |
| Foress Food Limited | Wholesale & retail | 2020 |
| Forest Heights Halton Limited | Households | 2018 |
| Forest Park (Marston Green) Management Company Limited | Households | 2003 |
| Forge Place (Wellingborough) Management Company Limited | Households | 2023 |
| Formas Transformation Group Limited | Administrative & support | 2026 |
| Formas Transformation Services Limited | Administrative & support | 2026 |
| Formora Limited | Construction | 2025 |
| Fortress Security Systems Limited | Administrative & support | 1993 |
| Foto Ltd | Professional & scientific | 2023 |
| Foundation Property Holdings Ltd | Real estate | 2026 |
| Foundry House (Freehold) Limited | Households | 1995 |
| Four Paws Fitness Ltd | Professional & scientific | 2019 |
| Fourways Management Limited | Households | 1977 |
| Fowlers Carpentry Limited | Construction | 2013 |
| FOX Meadows Management Company Limited | Households | 2018 |
| Foxbury Place (Fareham) Management Limited | Households | 2006 |
| Foxlow Manor Management Company Limited | Households | 2013 |
| Fpsc Ltd | Wholesale & retail | 2022 |
| Franc@Dinos Ltd | Other services | 2022 |
| Frascio U.K. Limited | Administrative & support | 2000 |
| Fraser Hamilton Research Limited | Information & communication | 2024 |
| Freedom Surfacing Limited | Construction | 2019 |
| French-Seven Limited | Professional & scientific | 2005 |
| Fresh Parking Solutions Ltd. | Administrative & support | 2018 |
| Freshlines Produce Ltd. | Manufacturing | 1999 |
| Friendly Pictures Ltd | Information & communication | 2025 |
| Frisco (U.K.) Sales Limited | Other services | 1981 |
| Frobisher Gardens (Chafford) Flats Management Company Limited | Households | 2004 |
| From Nature 2U Ltd | Administrative & support | 2024 |
| Froom & Co Limited | Water & waste | 1998 |
| FSL Investments Limited | Wholesale & retail | 2007 |
| Full Circle Commercial Ltd | Construction | 2023 |
| Function SIX Limited | Information & communication | 2020 |
| Funky Tips Limited | Other services | 2012 |
| Furniture Painters Business Academy Ltd | Other services | 2021 |
| Furzedown Films Ltd | Information & communication | 2021 |
| Fusion D&B Ltd | Construction | 2016 |