| F5 Computing Ltd | Information & communication | 2011 |
| F5ECC Yorkshire Limited | Wholesale & retail | 2026 |
| FA Digital Systems Ltd | Information & communication | 2020 |
| Faaiz-Khalil Services Limited | Agriculture & fishing | 2023 |
| FAB Bars Ltd | Hospitality | 2024 |
| Fabprint Limited | Manufacturing | 2024 |
| Fabric Corner Lincoln Ltd | Wholesale & retail | 2013 |
| Fabric Design Consultants Ltd | Professional & scientific | 2020 |
| Fabricate.London Limited | Professional & scientific | 2016 |
| Fabriccity Limited | Wholesale & retail | 2025 |
| Face O'Clock by ELI Sobon Ltd | Professional & scientific | 2023 |
| Fade Barber Lincoln Ltd | Other services | 2022 |
| Fairburn Enterprises Limited | Wholesale & retail | 2023 |
| Fairclear Limited | Construction | 1997 |
| Fairfax Management Consultants Limited | Professional & scientific | 1999 |
| Fairfield Bloodstock Ltd | Agriculture & fishing | 2022 |
| Fairfield Vision Ltd | Professional & scientific | 2024 |
| Fairhurst Carpets & Flooring Ltd | Construction | 2024 |
| Fairlawns Properties Ltd | Real estate | 2021 |
| Fairlawns Radiology Limited | Health & social care | 2016 |
| Fairview Safety Solutions Limited | Professional & scientific | 2015 |
| Fairways Management Company (Torksey) Limited | Real estate | 2005 |
| Fairy Glam Ltd | Wholesale & retail | 2010 |
| Faith Williams Law Limited | Professional & scientific | 2019 |
| Faithful's Fisheries (Tropical) Limited | Wholesale & retail | 1962 |
| Falcon Tech Solutions Ltd | Manufacturing | 2024 |
| Falkinder Holdings Limited | Financial services | 2017 |
| Falkinder Investments Limited | Real estate | 2017 |
| Famet Foods Ltd | Hospitality | 2025 |
| Family Dlar Ltd | Hospitality | 2026 |
| Family Law Arbitration Limited | Professional & scientific | 2011 |
| Family Team Ltd | Other services | 2017 |
| Familyhq Ltd | Information & communication | 2025 |
| Famlets Ltd | Real estate | 2025 |
| FAN Merch Ltd | Wholesale & retail | 2022 |
| FAN Spares UK Limited | Wholesale & retail | 2015 |
| Fanfair Group Limited | Financial services | 2024 |
| Fanfair Sport Limited | Manufacturing | 2024 |
| Fantastic Tea Ltd | Manufacturing | 2025 |
| FAR Reach Club Ltd | Administrative & support | 2026 |
| Farcap Investments Limited | Professional & scientific | 2025 |
| Faria and Evans Ltd | Hospitality | 2017 |
| Farm 2 Kitchen Ltd | Hospitality | 2025 |
| Farmacy PLC | Agriculture & fishing | 2006 |
| Farmb Labs Ltd | Professional & scientific | 2024 |
| Farmgate Properties (Retford) Limited | Construction | 2025 |
| Farmgem Limited | Wholesale & retail | 2009 |
| Farming Nerg Limited | Agriculture & fishing | 2025 |
| Farmmaster Machinery Limited | Wholesale & retail | 2026 |
| FARMNET360 Ltd | Financial services | 2025 |
| Farmtran Limited | Administrative & support | 2016 |
| Farnaught & FOX Holdings Limited | Real estate | 2026 |
| Farrow Design & Developments Limited | Construction | 2019 |
| Farthing House Limited | Professional & scientific | 2013 |
| FASCIN8TORS Limited | Extraterritorial | 2020 |
| Fastech International, Inc. | | 1997 |
| Fatima Meal Ltd | Hospitality | 2026 |
| Faun Trading Limited | Real estate | 2003 |
| Favor Sound Ltd | Arts & recreation | 2017 |
| Favourite Gifts UK Limited | Transport & logistics | 2026 |
| Fawcett Aggregates Limited | Mining & quarrying | 2021 |
| Fawcett Construction Lincoln Ltd | Construction | 2015 |
| Faye Cooper Consultancy Limited | Professional & scientific | 2019 |
| FBA by JB Ltd | Wholesale & retail | 2023 |
| FBA247 Holdings Limited | Information & communication | 2016 |
| FBA247 Ltd | Professional & scientific | 2013 |
| FC Online Sales Ltd | Wholesale & retail | 2025 |
| FCG Accounting Limited | Information & communication | 2018 |
| FCR Services Ltd | Construction | 2023 |
| FE Resources (Lincoln) Ltd | Administrative & support | 2011 |
| Featherstitch House Ltd | Manufacturing | 2020 |
| Feet on the Ground Events Limited | Administrative & support | 2007 |
| Feet on the Ground Training Limited | Administrative & support | 2003 |
| Feetprint Ltd | Extraterritorial | 2009 |
| Feggs Engineering Limited | Professional & scientific | 2025 |
| Felgate & SON Ltd | Hospitality | 2024 |
| Fellowship Consulting Ltd | Education | 2025 |
| FEN Farm Limited | Agriculture & fishing | 2017 |
| Fen-Bay Group Limited | Manufacturing | 2017 |
| Fen-Bay Services Limited | Manufacturing | 1999 |
| Fenlake Developments Limited | Construction | 2021 |
| Fenlake Estates Limited | Construction | 2019 |
| Fenland Farms Ltd | Agriculture & fishing | 2022 |
| Fenland Fitness Limited | Arts & recreation | 2026 |
| Fenland Hideaway Ltd | Hospitality | 2022 |
| Fenland Property Care Limited | Real estate | 2025 |
| Fenton Global Holdings Limited | Financial services | 2018 |
| Fenwell Lincoln Limited | Real estate | 2020 |
| Fernandes Enterprise Limited | Administrative & support | 2024 |
| Fertco Limited | Wholesale & retail | 2017 |
| Fetch Analytics (UK) Limited | Information & communication | 2020 |
| FF Electrical Ltd | Manufacturing | 2020 |
| FGM Inns Limited | Hospitality | 2023 |
| FHW Properties Limited | Real estate | 1986 |
| Fibre 143 Ltd | Information & communication | 2025 |
| Fibre Flex Limited | Information & communication | 2021 |
| Fidelis Law Limited | Professional & scientific | 2018 |
| Fidelis Legal Services Limited | Professional & scientific | 2016 |
| Fidus Business Limited | Financial services | 2026 |
| Field Estates Company Limited | Construction | 1973 |