| FMK Landscapes Ltd | Administrative & support | 2025 |
| Fndlincs CIC | Health & social care | 2025 |
| Fomo Promotion Ltd | Administrative & support | 2026 |
| Fone Trader 1 Limited | Wholesale & retail | 2024 |
| Food Connect Solutions Limited | Professional & scientific | 2017 |
| Food Procurement Services Limited | Professional & scientific | 2009 |
| Food Safety Management Systems Limited | Professional & scientific | 2010 |
| Food Specifications and Artwork Services Limited | Professional & scientific | 2014 |
| Foodfab Ltd | Extraterritorial | 2015 |
| Foodline Management Limited | Administrative & support | 2011 |
| Football DNA Limited | Education | 2017 |
| FOR COD Sake Limited | Hospitality | 2020 |
| Fordaire Aviation Limited | Manufacturing | 2010 |
| Forestry Management Limited | Agriculture & fishing | 2016 |
| Forever Last Roofing Ltd | Construction | 2023 |
| Foreverlast Roofing and Building Ltd | Construction | 2025 |
| Fortune Brickworks Ltd | Construction | 2026 |
| Fortzu Trans Ltd | Administrative & support | 2017 |
| Fosdyke Accountancy Services Limited | Professional & scientific | 2018 |
| Fosse Storage and Lets Ltd | Transport & logistics | 2025 |
| Foster and SON Roofing Services Ltd | Construction | 2023 |
| Fosters Group Ipswich Ltd | Construction | 2024 |
| Foulger Engineering Ltd | Professional & scientific | 2026 |
| Founders' Haven Ltd | Real estate | 2025 |
| Four Winds Equine Assisted C.I.C. | Agriculture & fishing | 2022 |
| FOUR04 Packaging Limited | Administrative & support | 2004 |
| Fowler Brothers Limited | Manufacturing | 2021 |
| Fowler Welch (Felixstowe) Limited | Real estate | 1999 |
| Fowler Welch Limited | Transport & logistics | 1971 |
| Fowlers Refinishers Limited | Wholesale & retail | 2013 |
| FR Midland Ltd | Transport & logistics | 2024 |
| Franklin Bros Limited | Financial services | 2011 |
| Franklyn's Forum Limited | Professional & scientific | 2023 |
| Franko Property Ventures Ltd | Real estate | 2023 |
| Fratelli Pizzeria 1 Ltd | Hospitality | 2023 |
| Freckleface Coffee Co. (York) Ltd | Wholesale & retail | 2023 |
| Freckleface Coffee Co. Ltd | Hospitality | 2021 |
| Freckleface Home Fragrance Ltd | Wholesale & retail | 2020 |
| Freckleface Property Ltd | Real estate | 2022 |
| Freckleface Retail (Cambridge) Ltd | Wholesale & retail | 2020 |
| Freckleface Retail (Lincoln) Ltd | Wholesale & retail | 2023 |
| Freckleface Retail (Stamford) Ltd | Wholesale & retail | 2020 |
| Freckleface Retail (TEN) Ltd | Wholesale & retail | 2021 |
| Freckleface Retail (York) Ltd | Wholesale & retail | 2021 |
| Freckleface Retail 6 Ltd | Wholesale & retail | 2025 |
| Fred Thorpe & Sons Limited | Agriculture & fishing | 1947 |
| Freda Trans Ltd | Transport & logistics | 2018 |
| FREE2MOVE Limited | Administrative & support | 2007 |
| Freeworld Foods Limited | Wholesale & retail | 2007 |
| Freiberger (UK) Limited | Wholesale & retail | 1989 |
| Fresh Creations Limited | Professional & scientific | 2010 |
| Fresh Forever Limited | Financial services | 2024 |
| Fresh Growth Solutions Limited | Administrative & support | 2011 |
| Fresh Hub Group Limited | Financial services | 2020 |
| Fresh Roots Limited | Wholesale & retail | 2013 |
| Fresh Start Research Limited | Professional & scientific | 2024 |
| Fresh Walls Ltd | Construction | 2025 |
| Freshlinc Group Limited | Financial services | 2008 |
| Freshlinc Limited | Transport & logistics | 2000 |
| Freshnest London Cleaning Ltd | Administrative & support | 2026 |
| Frisby Estates Limited | Real estate | 2010 |
| Fruit Forever Limited | Wholesale & retail | 2018 |
| Fruit World International Ltd | Wholesale & retail | 2023 |
| Frygo Ltd | Transport & logistics | 2018 |
| Fsas (Lincs) Ltd | Transport & logistics | 2016 |
| Fubini Investments Limited | Manufacturing | 2009 |
| Fuel and Carbon Saving Limited | Wholesale & retail | 2025 |
| Fulney Investments Limited | Professional & scientific | 2002 |
| Fulney Roads Management Limited | Construction | 1986 |
| Fulney Sand and Gravel Ltd | Wholesale & retail | 2021 |
| FUN Farm (Lincoln) Limited | Arts & recreation | 2007 |
| FUN Farm Holding Company Limited | Financial services | 2021 |
| FUN Farm Investments Limited | Arts & recreation | 2022 |
| FUN Farm Limited | Arts & recreation | 1997 |
| Funfulness Inc. Limited | Other services | 2019 |
| Funfulness Limited | Other services | 2024 |
| Fungai Mavhiya Ltd | Health & social care | 2014 |
| Funky Frogs Catering Ltd | Hospitality | 2011 |
| Furry Blue Hamster Limited | Information & communication | 2026 |
| Future Builders Ltd | Construction | 2016 |
| Future Drivers Ltd | Administrative & support | 2018 |
| Future Roofing Ltd | Construction | 2026 |
| Future S.E Ltd | Transport & logistics | 2019 |
| Futureproof Recruitment Ltd | Administrative & support | 2016 |
| Fvas Engineering Ltd | Manufacturing | 2020 |
| FWD Communications Limited | Administrative & support | 1999 |
| FYL Trans Ltd | Transport & logistics | 2026 |
| G & a Ellis Heating (Lincs) Ltd | Manufacturing | 2011 |
| G & a Hotels Limited | Hospitality | 2011 |
| G & G Transport Limited | Transport & logistics | 2018 |
| G & J Drivers Ltd | Transport & logistics | 2015 |
| G & J Roffe Limited | Professional & scientific | 2017 |
| G & L Plumbing & Heating Ltd | Construction | 2013 |
| G & M Accountancy Ltd | Professional & scientific | 2015 |
| G and a Groves Ltd | Agriculture & fishing | 2017 |
| G and K Fairfield (Holdings) Limited | Financial services | 2012 |
| G and M Property Rentals Limited | Real estate | 2015 |
| G C Baxter & Associates (Norfolk) Ltd | Professional & scientific | 2022 |
| G F Property Limited | Real estate | 2001 |
| G F Services & Sweeper Hire Ltd | Administrative & support | 2026 |