| FDK Healthcare Limited | Health & social care | 2022 |
| FDM Enterprises Ltd | Wholesale & retail | 2021 |
| FDP Consultancy Services Ltd | Health & social care | 2014 |
| FDS Divine Care Ltd | Health & social care | 2017 |
| Fearless Community Leicester CIC | Education | 2026 |
| Feast India Events Ltd | Administrative & support | 2025 |
| Feat Group Limited | Professional & scientific | 2026 |
| Feather and Hammer Management Solutions Limited | Wholesale & retail | 2009 |
| Feathers Creation Ltd | Wholesale & retail | 2019 |
| Febirian Limited | Wholesale & retail | 2021 |
| Fechi & Co Ltd | Professional & scientific | 2020 |
| FED Fast Logistics Ltd | Transport & logistics | 2022 |
| Federal Finance Incorporated Ltd | Extraterritorial | 2016 |
| Federal Finance Ltd | Financial services | 2014 |
| Federalguardppe Ltd | Wholesale & retail | 2025 |
| Federation of Muslim Organisations (Leicestershire) | Other services | 2008 |
| Feel Heard Ltd | Other services | 2026 |
| Feet & Co (UK) Ltd | Health & social care | 2007 |
| Felden Trading Ltd | Transport & logistics | 2015 |
| Felderland Haulage Ltd | Transport & logistics | 2014 |
| Feldmann Architects Limited | Professional & scientific | 2013 |
| Feldon Limited | Health & social care | 2023 |
| Felgate Industries Limited | Information & communication | 2012 |
| Feline Fine Cat Care Ltd | Other services | 2025 |
| Feljeez Limited | Wholesale & retail | 2022 |
| Felonic Ltd | Wholesale & retail | 2025 |
| Femi Health & Beauty Limited | Health & social care | 2015 |
| Femi Health Limited | Health & social care | 2017 |
| Femina Polskie Centrum CIC | Health & social care | 2023 |
| Femme Fashion Ltd | Wholesale & retail | 2024 |
| Femme-Tasse Limited | Wholesale & retail | 2020 |
| Fengxuan Asian Supermarket Ltd | Wholesale & retail | 2024 |
| Fenix Bespoke Interiors Ltd | Manufacturing | 2021 |
| Fenix Monitoring Limited | Administrative & support | 2025 |
| Fenixhealthcare Ltd | Wholesale & retail | 2022 |
| Fenlon Ltd | Administrative & support | 2014 |
| Fennell Holdco Limited | Financial services | 2023 |
| Fennessy Property Group Ltd | Households | 2021 |
| Fenrir Digital Ltd | Information & communication | 2018 |
| Fenrir Property Management Limited | Real estate | 2022 |
| Fenserv Consultancy Ltd | Professional & scientific | 2024 |
| Fenu Healthcare Ltd | Health & social care | 2021 |
| Fenwick Universal Ltd | Wholesale & retail | 2025 |
| Feps Global Services Ltd | Administrative & support | 2020 |
| Ferah Private Capital Ltd | Real estate | 2026 |
| Feral Enterprise Limited | Wholesale & retail | 2021 |
| Ferdi's Grill Ltd | Hospitality | 2021 |
| Fergie's Gifts Ltd | Wholesale & retail | 2024 |
| Fern Collection Limited | Financial services | 2025 |
| Fern Hospitality Limited | Hospitality | 2025 |
| Fern Real Estate Limited | Real estate | 2025 |
| Fernandes Consultancy (UK) Ltd | Other services | 2024 |
| Fernandes Futures Ltd | Real estate | 2019 |
| Fernandes.Media Limited | Information & communication | 2026 |
| Fernandez Enterprises Ltd | Real estate | 2025 |
| Ferndale Property Partnership Limited | Real estate | 2019 |
| Ferndale Wyatt Ltd | Wholesale & retail | 2024 |
| Fernee Limited | Real estate | 2024 |
| Fernie Property Group Limited | Real estate | 2022 |
| Fernleighs Bar and Bistro Limited | Hospitality | 2025 |
| Ferns Formwork Limited | Construction | 2015 |
| Ferns Windows and Doors Ltd | Construction | 2025 |
| Feroash Ltd | Real estate | 2020 |
| Feroxis Limited | Hospitality | 2025 |
| Feroz Gaibie Ltd | Health & social care | 2019 |
| Ferraby Equities Ltd | Financial services | 2025 |
| Ferrando & Massone London Limited | Transport & logistics | 2011 |
| Ferrari Italia 4U Ltd | Hospitality | 2019 |
| Ferrel PT Limited | Transport & logistics | 2024 |
| Ferrol Investments Limited | Real estate | 2019 |
| Ferron Optics Ltd | Health & social care | 2024 |
| FES Mangal BBQ Limited | Hospitality | 2023 |
| Fest Half Bars Ltd | Hospitality | 2025 |
| Fest Half Holdings Ltd | Financial services | 2025 |
| Fest Half Limited | Arts & recreation | 2022 |
| Festing Estates Limited | Real estate | 2017 |
| Festival Rideshare Limited | Transport & logistics | 2012 |
| Fete & Fable Ltd | Hospitality | 2026 |
| Fever Properties Ltd | Real estate | 2021 |
| FF Clothing Ltd | Manufacturing | 2026 |
| FFA Construction Ltd | Construction | 2025 |
| FFF Richard Slevin Limited | Arts & recreation | 2025 |
| Ffiona's Property Company Ltd | Real estate | 2016 |
| Ffomo Ltd | Wholesale & retail | 2014 |
| FFR Automotive Ltd | Administrative & support | 2018 |
| FFS (2023) Limited | Manufacturing | 1992 |
| FFS Care Limited | Households | 2025 |
| FFS Group (2023) Limited | Professional & scientific | 2005 |
| FFS Group Holdings (2023) Limited | Professional & scientific | 2013 |
| FFS INK (2023) Limited | Manufacturing | 2018 |
| Ffsc Limited | Information & communication | 2026 |
| Ffsd Ltd | Information & communication | 2022 |
| FG Enterprize Ltd | Wholesale & retail | 2017 |
| FGI Roban Limited | Manufacturing | 2022 |
| FGS Investments Ltd | Administrative & support | 2006 |
| FH Group (Leics) Ltd | Real estate | 2022 |
| FH Motor Group Limited | Wholesale & retail | 2026 |
| FHA Services Ltd | Administrative & support | 2021 |
| FHC Property Management Ltd | Real estate | 2024 |
| FHK Traders Ltd | Wholesale & retail | 2021 |