| Foard SJ Limited | Information & communication | 2016 |
| Focal Plastics Limited | Manufacturing | 1980 |
| Focus on Outcomes Ltd | Professional & scientific | 2014 |
| Focus Resources Ltd | Information & communication | 1998 |
| Focus Trans Consult Ltd | Transport & logistics | 2025 |
| Focusmain Ltd | Professional & scientific | 2004 |
| FOG Consulting Ltd | Administrative & support | 2021 |
| Fogless Limited | Extraterritorial | 1988 |
| Foley Civil Engineering Ltd | Construction | 2012 |
| Folley Electrical Services Ltd. | Construction | 2003 |
| Folvat Services Limited | Health & social care | 2014 |
| Fomo UN- Ltd | Other services | 2021 |
| Fone Club Pro Limited | Wholesale & retail | 2025 |
| Fone Club TEC Ltd | Wholesale & retail | 2022 |
| Fonnereau House Limited | Households | 1989 |
| Fonnereau Management Company Limited | Households | 1994 |
| Fonture Transportation Limited | Transport & logistics | 2022 |
| Food Delight Ltd | Wholesale & retail | 2020 |
| Food Twist Stores Ltd | Wholesale & retail | 2023 |
| Foodix-Trade Ltd | Wholesale & retail | 2024 |
| Foodsteps Ltd | Professional & scientific | 2018 |
| Foot Kandi Ltd | Other services | 2020 |
| Football FUN Factory ( Community 091 ) Limited | Arts & recreation | 2023 |
| Footnote Books Limited | Arts & recreation | 2011 |
| Footprints (EA) Ltd | Health & social care | 2017 |
| Footsport Dynamics Ltd | Arts & recreation | 2025 |
| Footstars C.I.C. | Arts & recreation | 2012 |
| FOR People Work Limited | Construction | 2023 |
| Fordham Farm Company Limited | Professional & scientific | 2001 |
| Fordham House Limited | Agriculture & fishing | 2022 |
| Fordham Property Investments Limited | Real estate | 2020 |
| Fordley Land Company Limited | Real estate | 1977 |
| Fordon Asset Management Ltd | Real estate | 2017 |
| Fore Street Pubs Ltd | Hospitality | 2021 |
| Foregain East Limited | Financial services | 2021 |
| Foregain Holdings Limited | Financial services | 2014 |
| Foregain Limited | Other services | 1999 |
| Foremost Garage Doors Limited | Construction | 2003 |
| Foreshore Accountancy LLP | | 2011 |
| Forest TEC Limited | Wholesale & retail | 2016 |
| Forever Bright Cleaning Ltd | Administrative & support | 2026 |
| Forever Home Transformations Limited | Construction | 2026 |
| Forever ME Ltd | Other services | 2015 |
| Forever Support Services Ltd | Health & social care | 2023 |
| Forewood Floors Ltd | Manufacturing | 2013 |
| Forge Commercial Property LLP | | 2023 |
| Forgefocus Ltd | Professional & scientific | 2024 |
| Fork-Spec Ltd | Manufacturing | 2025 |
| Forking Nuts About Gardening Ltd | Administrative & support | 2011 |
| Formarch Property Limited | Real estate | 2020 |
| Formation Three Limited | Extraterritorial | 1999 |
| Former Athletes Mentoring Limited | Arts & recreation | 2026 |
| Formula Group Holdings Ltd | Construction | 2023 |
| Fort West END Asset Ltd | Hospitality | 2018 |
| Fort West END Hotel Management Company Ltd | Hospitality | 2018 |
| Fortegate Inter Ltd | Extraterritorial | 2026 |
| Fortezza Ltd | Real estate | 2022 |
| Fortify Running Performance Ltd | Arts & recreation | 2026 |
| Fortitude BJJ Ltd | Arts & recreation | 2026 |
| Forward Law Ltd | Professional & scientific | 2019 |
| Foskers Holdings Limited | Construction | 2021 |
| Foskers Limited | Wholesale & retail | 2008 |
| Foskett Willows Limited | Manufacturing | 2012 |
| Fosse Urban Projects Limited | Construction | 2018 |
| Foster & Cranfield Limited | Financial services | 1997 |
| Foster Dawson LLP | | 2007 |
| Foster Ventures LLP | | 2008 |
| Fosters Roofing and Guttering Ltd | Construction | 2025 |
| Foulgers Dairy Limited | Wholesale & retail | 2007 |
| Foundation Properties (Construction) Ltd | Construction | 2014 |
| Fountain of Health Ltd | Health & social care | 2014 |
| Four Lion's Co Ger-Can Limited | Real estate | 1995 |
| Four Paws Tails Ltd | Agriculture & fishing | 2018 |
| Fouroneeight Technology Limited | Information & communication | 2022 |
| Fourway Pallet Recycling Ltd | Hospitality | 2010 |
| FOW Productions Ltd | Information & communication | 2025 |
| FOX Corner Renovations Ltd | Construction | 2026 |
| FOX Red Properties Ltd | Real estate | 2025 |
| FOX Wood Wild Limited | Agriculture & fishing | 2017 |
| Fox&Flowers Ltd | Information & communication | 2022 |
| Fox's Yacht Service Limited | Manufacturing | 2018 |
| Fox's Yachts Limited | Wholesale & retail | 2023 |
| Foxglove Inns Ltd | Hospitality | 2018 |
| Foxgrove Management Limited | Real estate | 2016 |
| Foxhall DRY Cleaning Ltd | Other services | 2019 |
| Foxhall Estate Agents Ltd | Real estate | 2019 |
| Foxhall Estates Limited | Real estate | 2025 |
| Foxhall Groomers Ltd | Other services | 2024 |
| Foxhall Risk Management Ltd | Financial services | 2022 |
| Foxhall Solutions Limited | Information & communication | 1999 |
| Foxhaul Logistics Limited | Transport & logistics | 2021 |
| Foxram Ltd | Wholesale & retail | 2019 |
| Foxsel Limited | Professional & scientific | 2018 |
| Foxtail Interiors Ltd | Professional & scientific | 2026 |
| Foxtail Properties LLP | | 2012 |
| FP Pro Ltd | Construction | 2023 |
| FR Stores Ltd | Wholesale & retail | 2024 |
| FRA Online Ltd | Wholesale & retail | 2024 |
| Frabosa Maritime Ltd | Financial services | 2025 |
| Framlingham Aviation Maintenance Company Limited | Manufacturing | 2013 |