| Fortis Construct Ltd | Construction | 2020 |
| Fortis Consultancy Ltd | Professional & scientific | 2024 |
| Fortis Facilities Limited | Administrative & support | 2026 |
| Fortis Fleet Holdings Ltd | Financial services | 2025 |
| Fortis Fleet Solutions Ltd | Wholesale & retail | 2025 |
| Fortis Operations Limited | Administrative & support | 2023 |
| Fortis Retail Limited | Administrative & support | 2024 |
| Fortress Plus Ltd | Hospitality | 2020 |
| Fortuitous Estates Limited | Real estate | 2025 |
| Fortumax Limited | Administrative & support | 2019 |
| Fortune Cookie Moorends Ltd | Hospitality | 2025 |
| Fortune Dine Limited | Hospitality | 2019 |
| Forum Sports Management Limited | Arts & recreation | 2022 |
| Forwarding Business Limited | Transport & logistics | 2019 |
| Forza Properties Ltd | Real estate | 2022 |
| Fosco (UK) Limited | Professional & scientific | 2008 |
| Foster & Robins Plastering Limited | Construction | 2004 |
| Foster & Scott Investments Limited | Real estate | 2019 |
| Foster & Scott Ltd | Administrative & support | 2012 |
| Foster & Sons Investments Limited | Other services | 2023 |
| Foster Estates Limited | Construction | 2018 |
| Found My Niche CIC | Information & communication | 2024 |
| Foundation Equipment Support Ltd | Manufacturing | 2019 |
| Foundation Information Technology Limited | Information & communication | 2010 |
| Foundation Old Co Limited | Information & communication | 1996 |
| Foundation Packaging Limited | Administrative & support | 1999 |
| Founders Leisure Ltd | Hospitality | 2023 |
| Foundry Place Residents Limited | Households | 2020 |
| Fountain 22 Limited | Real estate | 2024 |
| Four Corners Property Group Limited | Real estate | 2024 |
| Four First Names Ltd | Professional & scientific | 2023 |
| Four Five Creative Limited | Professional & scientific | 2026 |
| Four Friends Pet Foods Limited | Wholesale & retail | 2013 |
| Four H Enterprise Ltd | Real estate | 2026 |
| Fourleaf (Axholme) Ltd | Wholesale & retail | 1997 |
| Foursix Utilities Ltd | Manufacturing | 2026 |
| Fourways Country Park Ltd | Hospitality | 2015 |
| Fovic Care Ltd | Administrative & support | 2022 |
| Foward Construction Ltd | Construction | 2025 |
| FOX & Faolan Ltd | Wholesale & retail | 2021 |
| FOX Commercials Ltd | Wholesale & retail | 2014 |
| FOX Covert Farm Ltd | Agriculture & fishing | 2020 |
| FOX Ice Cream Tugboat Ltd | Hospitality | 2025 |
| FOX James Productions Limited | Arts & recreation | 2019 |
| FOX Mobile Services Ltd | Wholesale & retail | 2025 |
| FOX Plan & Protect Ltd | Financial services | 2013 |
| FOX Revolution Turbo Ltd | Wholesale & retail | 2022 |
| FOX Scaffolding Limited | Construction | 2024 |
| FOX Technical Ltd | Professional & scientific | 2011 |
| Foxlea Holdings Limited | Extraterritorial | 2022 |
| Foxlow Residents Management Company Limited | Households | 2020 |
| Foxtail Property Ltd | Real estate | 2024 |
| Foxtrot Golf Limited | Extraterritorial | 2026 |
| Foxwood Rentals Ltd | Real estate | 2022 |
| Foxx Homes Limited | Real estate | 2025 |
| Foxxbriar Limited | Financial services | 2012 |
| FP Fulfilment UK Limited | Transport & logistics | 2025 |
| FPB Healthcare Ltd | Administrative & support | 2026 |
| FPC Joinery Ltd | Construction | 2025 |
| Fractionalbyday Ltd | Administrative & support | 2026 |
| Frame IT (UK) Limited | Construction | 2008 |
| Framecourt Homes Limited | Real estate | 1975 |
| Framesprayuk Ltd | Construction | 2018 |
| Fran Needham Music & Events Solutions Ltd | Administrative & support | 2024 |
| Frances Montgomery Ltd | Administrative & support | 2016 |
| Francis Upritchard Ltd | Administrative & support | 2010 |
| Frank Lloyd Wright Limited | Professional & scientific | 2004 |
| Frank Wilson Lifestyle Ltd | Professional & scientific | 2026 |
| Frankies.B.S Limited | Construction | 2023 |
| Frankie’S Baby Boutique Limited | Wholesale & retail | 2023 |
| Franklin Marketing Ltd | Other services | 2024 |
| Frann Limited | Transport & logistics | 2024 |
| Franquemont Ltd | Professional & scientific | 2023 |
| Fraser Craine Ltd | Real estate | 2025 |
| Fraser Developments Ltd | Households | 2024 |
| Fraser Funding Limited | Financial services | 2025 |
| Frcc Limited | Construction | 2021 |
| Frearson TM Contracts Ltd | Public administration | 2024 |
| Fred Camm Recovery Limited | Wholesale & retail | 2010 |
| Fred's OFF License Limited | Wholesale & retail | 2022 |
| Freddy's Doncaster Limited | Hospitality | 2022 |
| Frederick Spence Investments Ltd | Financial services | 2026 |
| Frederick Wellington Ltd | Real estate | 2016 |
| Fredosa Healthcare Services Limited | Health & social care | 2017 |
| Free 24/7 Energy Limited | Construction | 2021 |
| Free Heat Limited | Professional & scientific | 2006 |
| Free-Ways Developments Ltd | Construction | 2025 |
| Freedance Properties Limited | Real estate | 1993 |
| Freelance Consulting (Doncaster) Limited | Professional & scientific | 2017 |
| Freeman Resources Ltd | Administrative & support | 2018 |
| Freemotion Body Therapy Limited | Other services | 2024 |
| Freesiarch Ltd | Extraterritorial | 2013 |
| Freight Solutions Dordrecht Ltd | Transport & logistics | 2022 |
| Freightxpress Limited | Transport & logistics | 2025 |
| French Mobile Home Holidays Limited | Extraterritorial | 2012 |
| French Property & Development Ltd | Real estate | 2023 |
| Frenchgate News & Food Ltd | Wholesale & retail | 2019 |
| Frenchgate Stores Limited | Wholesale & retail | 2024 |
| Frenforest Ltd | Wholesale & retail | 2024 |
| Fresh and Bright Ltd | Administrative & support | 2024 |