| Foody Shared Service Ltd | Manufacturing | 2021 |
| FOR HER Service Limited | Transport & logistics | 2025 |
| Forces Cars Direct (Holdings) Limited | Financial services | 2025 |
| Forces Cars Direct Limited | Other services | 1997 |
| Forces Equine Ltd | Other services | 2012 |
| Foreshore Homes Ltd | Real estate | 2017 |
| Forest Pharmaceutical Ltd | Wholesale & retail | 2024 |
| Forever Properties (Lincoln) Limited | Real estate | 2024 |
| Forman Bros. Limited | Wholesale & retail | 2023 |
| Formed Group Limited | Wholesale & retail | 2011 |
| Formie Studio Limited | Arts & recreation | 2025 |
| Fornox Ltd | Hospitality | 2026 |
| Forrest Feeds Limited | Wholesale & retail | 2011 |
| Forterro UK 123 Insight Limited | Information & communication | 2002 |
| Forterro UK Orderwise Limited | Information & communication | 2003 |
| Fortex Engineering Limited | Manufacturing | 2013 |
| Fortex Limited | Construction | 2025 |
| Fortex Motors Limited | Wholesale & retail | 2023 |
| FOS Europe Ltd | Wholesale & retail | 2018 |
| FOS International (UK) Limited | Professional & scientific | 2009 |
| Fossdyke Group Ltd | Financial services | 2025 |
| Fossdyke Holdings Limited | Financial services | 2019 |
| Fossdyke Paddock Management Limited | Households | 2021 |
| Fosse Way Academy Ltd | Education | 2011 |
| Fosse Way Care Developments Limited | Construction | 2016 |
| Fosseway Thermal Group Limited | Construction | 2022 |
| Fosseway Thermal Insulation Limited | Construction | 2022 |
| Fosseway Thermal Trace Heating Limited | Construction | 2022 |
| Foster & Sims Limited | Wholesale & retail | 2004 |
| Foster & Sims Windscreens Limited | Wholesale & retail | 2004 |
| Foster Brothers Lincoln Limited | Real estate | 2024 |
| Foster Tuition Ltd | Extraterritorial | 2024 |
| Fosters Building Limited | Construction | 2018 |
| Fosterslettings Ltd | Real estate | 2021 |
| Fothergill Training & Consulting Ltd | Professional & scientific | 2016 |
| Foulston and Smith Developments Limited | Construction | 2023 |
| Foundation Holdings Limited | Information & communication | 2018 |
| Foundry Consulting & Residences Ltd | Real estate | 2025 |
| Foundry Leisure Limited | Arts & recreation | 2023 |
| Four Candles Performance Development Ltd | Education | 2012 |
| Four-Legged Stool Ltd | Hospitality | 2015 |
| Fourmotion Mechanical Services Ltd | Wholesale & retail | 2024 |
| Fowler Financial Services Ltd | Financial services | 2014 |
| FOX Cabs Ltd | Transport & logistics | 2026 |
| FOX Contracting (Owmby) Limited | Construction | 1991 |
| FOX Electrical Supplies Limited | Wholesale & retail | 2006 |
| FOX Red Aerospace Ltd | Professional & scientific | 2025 |
| FOX Red Forensics Ltd | Health & social care | 2017 |
| FOX Waste Limited | Administrative & support | 2006 |
| Foxby Court Management Limited | Real estate | 1996 |
| Foxstern Limited | Professional & scientific | 2022 |
| Foxwold Plant Limited | Wholesale & retail | 2010 |
| FR33 Ltd | Professional & scientific | 2024 |
| Fractal Climbing Ltd | Hospitality | 2025 |
| Fractalyser Limited | Extraterritorial | 2025 |
| Fragrances UK Limited | Manufacturing | 2010 |
| Framework Architecture and Urban Design Limited | Professional & scientific | 2004 |
| Franchise Funding Consultancy Ltd | Professional & scientific | 2018 |
| Franchise Resales Limited | Professional & scientific | 2007 |
| Francis Building Works Ltd | Construction | 2025 |
| Francis Painting Contractors Limited | Administrative & support | 2018 |
| Francy Puthussery Ltd | Health & social care | 2015 |
| Frank Bell (Lincoln) Ltd | Health & social care | 2013 |
| Frankeys Ltd | Real estate | 2008 |
| Franklin & Hall Properties Limited | Real estate | 2006 |
| Franklin Management Limited | Real estate | 2014 |
| Franks Italian Barbers Limited | Other services | 2025 |
| Franluka Limited | Other services | 2011 |
| Fransom Ltd | Professional & scientific | 2014 |
| Fraser Fenwick Racing Limited | Arts & recreation | 2025 |
| Freckleface Productions Limited | Arts & recreation | 2018 |
| Freedman Scientific Ltd | Professional & scientific | 2022 |
| Freedom Fire & Security Maintenance Limited | Administrative & support | 2007 |
| Freedom Fire Properties LLP | | 2012 |
| Freemac Developments Ltd | Construction | 2025 |
| Freeman Builders Lincoln Limited | Construction | 2014 |
| Freeston Football Limited | Arts & recreation | 2024 |
| Freethought Group Limited | Financial services | 2023 |
| Freethought Internet Limited | Information & communication | 2006 |
| Freethought Services Limited | Information & communication | 2020 |
| Freewatt (Solar 4) Ltd | Energy | 2023 |
| Freewatt Group Limited | Administrative & support | 2013 |
| French New Builds Ltd | Construction | 2019 |
| Frend and Sons Ltd | Construction | 2019 |
| Frendli Ltd | Wholesale & retail | 2025 |
| Fresh Approach Care Training Ltd | Health & social care | 2023 |
| Fresh Scent Fragrance Ltd | Wholesale & retail | 2025 |
| Fresh Vision Consultancy Services Ltd | Professional & scientific | 2022 |
| Frevelo LLP | | 2020 |
| Freya Loren Limited | Information & communication | 2025 |
| Friary Investments Limited | Real estate | 2003 |
| Friends of Nocton School CIC | Financial services | 2025 |
| Frilion Real Estate Ltd | Real estate | 2021 |
| Frith a Limited | Wholesale & retail | 2018 |
| Frog Developments Limited | Real estate | 2017 |
| Frog Letting Limited | Real estate | 2015 |
| Frog Property Management Limited | Real estate | 2025 |
| From Lincolnshire Ltd | Wholesale & retail | 2021 |
| Frontgold Energy Resource UK Limited | Wholesale & retail | 2018 |
| Frontline Combat Ltd | Arts & recreation | 2017 |