| Fiazmogra Ltd | Information & communication | 2026 |
| Fibre Optic Connections Limited | Information & communication | 2013 |
| Fibre Optic Utilities Limited | Construction | 2017 |
| Fibre Studio Leicester Limited | Arts & recreation | 2025 |
| Fibre Technology Solutions Ltd | Information & communication | 2025 |
| Fich & Ramous Clothing Ltd | Manufacturing | 2016 |
| FID Services Limited | Administrative & support | 2015 |
| Fidelis Executive Security Ltd | Administrative & support | 2025 |
| Fidelis Mortgages Ltd | Financial services | 2025 |
| Fidelise Ltd | Health & social care | 2013 |
| Fidem Shipping &Customs Clearance Consultants Ltd | Transport & logistics | 2013 |
| Fidgix Factory Ltd | Wholesale & retail | 2026 |
| Fidoo Transport Ltd | Transport & logistics | 2024 |
| Field & Larder Catering Ltd | Agriculture & fishing | 2024 |
| Field Associates (Contractors) Limited | Wholesale & retail | 1966 |
| Field House Duffield RTM Company Ltd | Households | 2024 |
| Field's Timber Supplies Limited | Manufacturing | 2021 |
| Fields and Farms Ltd | Administrative & support | 2019 |
| Fields Finance Ltd | Professional & scientific | 2019 |
| Fieldsfour Ltd | Financial services | 2016 |
| Fifi & MO Ltd | Wholesale & retail | 2020 |
| Fifi&Gee Ltd | Other services | 2016 |
| Fifteethree Ltd | Wholesale & retail | 2022 |
| Fifth Generation Properties Limited | Real estate | 1971 |
| Fifth Property Ltd | Real estate | 2020 |
| Fifty ISH Consultancy Ltd | Professional & scientific | 2025 |
| Fiftytwo Inc Ltd | Information & communication | 2015 |
| Figa Store Limited | Manufacturing | 2009 |
| Fight Prep Limited | Manufacturing | 2011 |
| Fightlore Limited | Information & communication | 2023 |
| Figure 8 Fashion Limited | Manufacturing | 2014 |
| Figures and Flow Ltd | Professional & scientific | 2025 |
| Figz Holdings Limited | Financial services | 2025 |
| Fiji Foods UK Ltd | Other services | 2018 |
| Fikr Labs Limited | Information & communication | 2026 |
| Fikrah Ltd | Information & communication | 2019 |
| Filbert Property Ltd | Hospitality | 2025 |
| Filiadei Limited | Real estate | 2020 |
| Filigree Heart Limited | Wholesale & retail | 2015 |
| Filipino Express Balikbayan Box Services Ltd | Transport & logistics | 2013 |
| Filiz Kitchen Ltd | Hospitality | 2025 |
| Film Leicester CIC | Administrative & support | 2021 |
| Film RAD Limited | Information & communication | 2018 |
| Filter Foams Ltd | Agriculture & fishing | 2013 |
| Filtr Talent Limited | Information & communication | 2024 |
| FIN Operations Limited | Transport & logistics | 2024 |
| Finaccu Ltd | Professional & scientific | 2025 |
| Final Rigging Solutions Ltd | Professional & scientific | 2016 |
| Finaldrop Ltd | Transport & logistics | 2026 |
| Finance Advice Centre (Ashby) Ltd | Financial services | 2018 |
| Finance Berry Limited | Financial services | 2022 |
| Finance Car Shop Ltd | Wholesale & retail | 2015 |
| Finance Craft Ltd | Professional & scientific | 2024 |
| Finance Market Watch Ltd | Professional & scientific | 2025 |
| Finance My Home Ltd | Financial services | 2020 |
| Financelab (Commercial) Ltd | Financial services | 2025 |
| Financial Choice Solutions Limited | Financial services | 2016 |
| Financial Enterprise Ltd | Information & communication | 2021 |
| Financial Management Consultants (UK) Ltd | Professional & scientific | 2010 |
| Finat Ltd | Transport & logistics | 2019 |
| Finch & Rimington Independent Funeral Directors Limited | Other services | 2023 |
| Finch Probate Limited | Professional & scientific | 2021 |
| Finch Tax and Accountancy Services Limited | Professional & scientific | 2015 |
| Finchpoint Limited | Information & communication | 2021 |
| Finchys Property Limited | Real estate | 2024 |
| Find a Local Gardener Ltd | Households | 2018 |
| Find ME a Car Ltd | Wholesale & retail | 2019 |
| Find UR Style Ltd | Wholesale & retail | 2021 |
| Find Your Home Ltd | Real estate | 2019 |
| Find Your Muse Limited | Manufacturing | 2024 |
| Fine & Country East Midlands Ltd | Real estate | 2020 |
| Fine AF X Ltd | Manufacturing | 2020 |
| Fine and Cultural Tours Limited | Administrative & support | 2023 |
| Fine Knits (UK) Ltd | Manufacturing | 2012 |
| Fine Motors Ltd | Wholesale & retail | 2024 |
| Fine Prestige Homes Ltd | Real estate | 2026 |
| Fine Refinishing Solutions Ltd | Wholesale & retail | 2025 |
| Fine TEC Ltd | Wholesale & retail | 2026 |
| Fine Touch London Ltd | Manufacturing | 2020 |
| Fine Touch Ltd | Manufacturing | 2019 |
| Fine Tubes Limited | Manufacturing | 1943 |
| Fine Wood Finishes Ltd | Manufacturing | 2019 |
| Finella International Limited | Manufacturing | 1997 |
| Finella Properties Ltd | Extraterritorial | 2018 |
| Fineministore Ltd | Wholesale & retail | 2023 |
| Finesse 1999 Ltd | Hospitality | 2025 |
| Finesse Refinishing Ltd | Wholesale & retail | 2015 |
| Finest Fruit & VEG Ltd | Wholesale & retail | 2018 |
| Finest Living Ltd | Real estate | 2025 |
| Finest Stores Leicester Ltd | Wholesale & retail | 2019 |
| Finesthetics Ltd | Real estate | 2019 |
| Fingaurd Limited | Information & communication | 2026 |
| Fingerprints Cafe Limited | Wholesale & retail | 2009 |
| Fingers Crossed Ltd | Arts & recreation | 2025 |
| Finish Line Floors Limited | Manufacturing | 2025 |
| Finite IT Limited | Information & communication | 2019 |
| Finiti Search Limited | Administrative & support | 2007 |
| Finnerty Property Ltd | Real estate | 2026 |
| Finness Limited | Wholesale & retail | 2020 |
| Finney Investments Ltd | Households | 2005 |