| Finngrim Studios Ltd | Information & communication | 2020 |
| Finnstock Limited | Information & communication | 2011 |
| Finpro Limited | Real estate | 2023 |
| Finsta Holdings Ltd | Financial services | 2026 |
| Finstin Properties Limited | Real estate | 2025 |
| Fintan Developments Ltd | Construction | 2010 |
| Fintech Business Consultancy Ltd | Professional & scientific | 2025 |
| Fintech Payment Group Ltd | Wholesale & retail | 2021 |
| Fintecx Group Limited | Professional & scientific | 2017 |
| Fintra Business Support Ltd | Professional & scientific | 2019 |
| Fintrack Advisory Ltd | Professional & scientific | 2025 |
| Finwrk Ltd | Professional & scientific | 2025 |
| Fiona Cairns Limited | Manufacturing | 1969 |
| Fiona Lambert Ltd | Other services | 2016 |
| Fiona Mcnaught Management Services Ltd | Administrative & support | 2014 |
| Fiori Brand Works Ltd | Professional & scientific | 2022 |
| Fiori DI Liberta Ltd | Health & social care | 2024 |
| Fircroft Cedars Ltd | Wholesale & retail | 2024 |
| Firdose Limited | Wholesale & retail | 2014 |
| Firdous Designs Ltd | Construction | 2025 |
| Fire & Soul Limited | Professional & scientific | 2017 |
| Fire Damper Compliance Services Limited | Professional & scientific | 2026 |
| Fire Mist Ltd | Construction | 2020 |
| Fire Mountain Ltd | Manufacturing | 2020 |
| Fire N Ice Ltd | Wholesale & retail | 2007 |
| Fire Proof Limited | Administrative & support | 2002 |
| Fire Ride Ltd | Arts & recreation | 2023 |
| Fire Services Systems Ltd | Construction | 2020 |
| Fireaway Corby Ltd | Hospitality | 2026 |
| Fireaway Leicester Limited | Hospitality | 2019 |
| Fireaway Oadby Ltd | Hospitality | 2019 |
| Firebird Estates Limited | Real estate | 2007 |
| Firebird Solutions Ltd | Other services | 2011 |
| Firebird Trading Limited | Hospitality | 2009 |
| Firebrand Ltd | Administrative & support | 2017 |
| Firefly Escapes Ltd | Hospitality | 2021 |
| Firefly Leicester Community Interest Company | Education | 2014 |
| Fireguard Consultants Ltd | Financial services | 2024 |
| Firelight Open Fires Limited | Professional & scientific | 2003 |
| Fireserv Holdings Limited | Financial services | 2024 |
| Fireserv UK (Midlands) Limited | Construction | 2013 |
| Firesight Ltd | Professional & scientific | 2014 |
| Firestone Holdings Limited | Real estate | 2020 |
| Firing Blanks Limited | Wholesale & retail | 2019 |
| Firmain Estates Ltd | Construction | 2004 |
| Firmin Select Ltd | Real estate | 2023 |
| Firs Management Solutions Limited | Professional & scientific | 2008 |
| First 4 Health INT Ltd | Wholesale & retail | 2017 |
| First 4 Maintenance Ltd | Other services | 2015 |
| First AID Specialist Ltd | Wholesale & retail | 2013 |
| First and Fast Plus Ltd | Health & social care | 2020 |
| First Avenue Property Consulting and Management Ltd | Real estate | 2018 |
| First Branch Properties Ltd | Real estate | 2020 |
| First Call Contractors Limited | Construction | 2017 |
| First Call Financial (Leics) Ltd | Financial services | 2006 |
| First Call GAS & Heating Ltd | Construction | 2021 |
| First Care Plus One Ltd | Administrative & support | 2020 |
| First Choice Build Ltd | Construction | 2019 |
| First Choice Care Agency Limited | Health & social care | 2013 |
| First Class Hospitality Group Ltd | Financial services | 2025 |
| First Class Learning LE7 Ltd | Education | 2025 |
| First Class Network Ltd | Professional & scientific | 2025 |
| First Corporate Secretaries Ltd | Professional & scientific | 2025 |
| First for Fire and Security Limited | Administrative & support | 2017 |
| First Hub Gear Motors Limited | Wholesale & retail | 2024 |
| First Images Limited | Administrative & support | 1996 |
| First Line Fencing Ltd | Administrative & support | 2020 |
| First Mediation Ltd | Information & communication | 2025 |
| First Nursing Limited | Health & social care | 2003 |
| First One Services Ltd | Transport & logistics | 2022 |
| First Potteries Limited | Transport & logistics | 1988 |
| First Quality Care Limited | Health & social care | 2022 |
| First Real Solutions Ltd | Public administration | 2018 |
| First Step 110 Ltd | Wholesale & retail | 2026 |
| First Step Real Estate Ltd | Real estate | 2024 |
| First Steps (Beaumont Leys) Ltd | Education | 2016 |
| First Steps Pre-School Limited | Health & social care | 2008 |
| First Team Footballer Ltd | Arts & recreation | 2025 |
| First TRY Ltd | Administrative & support | 2019 |
| First UK Expression Ltd | Manufacturing | 2026 |
| FIRST4AIRPORT Limited | Transport & logistics | 2019 |
| FIRST4TOWBARS Ltd | Wholesale & retail | 2023 |
| Firstchoice Building Solutions Ltd | Construction | 2022 |
| Firsthose (Leicester) Limited | Administrative & support | 2006 |
| Firstpoint CTS Limited | Professional & scientific | 2018 |
| Firstview Construction Ltd | Construction | 2021 |
| Firstworldproblems Ltd | Professional & scientific | 2025 |
| Fischer Commercial Limited | Extraterritorial | 2015 |
| Fischer Developments (Leicester) Limited | Construction | 2018 |
| Fischer Energy PLC | Extraterritorial | 2016 |
| Fischer Future Heat Group Limited | Professional & scientific | 2014 |
| Fischer Heat Electric Limited | Manufacturing | 2022 |
| Fiscora Limited | Information & communication | 2025 |
| Fish & Chips (Leicester) Limited | Hospitality | 2006 |
| Fish Diseases Ltd | Agriculture & fishing | 2024 |
| Fish Shop Supplies Limited | Wholesale & retail | 2011 |
| Fisher King Finance Ltd | Professional & scientific | 2023 |
| Fishlake Results Ltd | Hospitality | 2016 |
| Fishmonger Nottingham Ltd | Wholesale & retail | 2026 |
| Fishpetsreptiles.Co.Uk Ltd. | Wholesale & retail | 2001 |