| Forest Gate Taxi Ltd | Transport & logistics | 2023 |
| Forest Hill Auto Centre Ltd | Wholesale & retail | 2017 |
| Forest House Dental Surgery Limited | Health & social care | 2007 |
| Forest House Property Limited | Real estate | 2016 |
| Forest Leicester Holdings Ltd | Financial services | 2024 |
| Forest Leicester Ltd | Financial services | 2024 |
| Forest Robin Property Services Ltd | Wholesale & retail | 2024 |
| Forest Rock Day Nursery Limited | Education | 2019 |
| Forest Town Valeting Ltd | Wholesale & retail | 2021 |
| Forest View (Botcheston) Management Company Limited | Real estate | 2005 |
| Forestlea Ltd | Administrative & support | 2020 |
| Forestzone Limited | Construction | 2023 |
| Forever Green Vintage Ltd | Wholesale & retail | 2024 |
| Forever Memoir Ltd | Wholesale & retail | 2024 |
| Forever Nails Limited | Other services | 2012 |
| Forever Pictures Studios Limited | Professional & scientific | 2023 |
| Forever Safe Homes Ltd | Health & social care | 2026 |
| Forever Savvy | Education | 2011 |
| Forever Tunnel Limited | Wholesale & retail | 2024 |
| Forewood Limited | Transport & logistics | 2025 |
| Forge END Management Company Limited | Households | 1999 |
| Forget ME Knot Limited | Wholesale & retail | 2003 |
| Forget ME NOT Holidays Limited | Hospitality | 2025 |
| Forgotten Birthday Films Limited | Arts & recreation | 2022 |
| Fork Lift Training Services Limited | Education | 2025 |
| Forkland Training Ltd | Education | 2023 |
| Formal Lettings Limited | Real estate | 2013 |
| Formal Saints Ltd | Wholesale & retail | 2018 |
| Formalnew Property Management Limited | Administrative & support | 1997 |
| Formatix AI Ltd | Information & communication | 2024 |
| Formers (UK) Limited | Manufacturing | 1992 |
| Formiq Design Studio Ltd | Professional & scientific | 2025 |
| Formique Limited | Manufacturing | 2000 |
| Formula Driving School Limited | Education | 2022 |
| Formwell Plastics Limited | Manufacturing | 1991 |
| Forr Transport Ltd | Transport & logistics | 2025 |
| Forry Beauty Limited | Other services | 2026 |
| Fort Area Limited | Hospitality | 2025 |
| Fort Improvements Ltd | Construction | 2021 |
| Fort Installation Ltd | Construction | 2024 |
| Fort Properties and Investments Ltd | Real estate | 2021 |
| Fortcrest Limited | Real estate | 1984 |
| Forte AGE Ltd | Construction | 2025 |
| Forte Architectural Ltd | Construction | 2025 |
| Forte Cleaning Ltd | Administrative & support | 2018 |
| Forte HR Consulting Ltd | Administrative & support | 2020 |
| Forte Investing Ltd | Financial services | 2019 |
| Fortevita Limited | Hospitality | 2012 |
| Fortis Future Limited | Information & communication | 2025 |
| Fortis Hub Ltd | Professional & scientific | 2022 |
| Fortis Private Wealth Limited | Professional & scientific | 2021 |
| Fortitude (ZW) Ltd | Health & social care | 2023 |
| Fortitude Legal Services Ltd | Professional & scientific | 2024 |
| Fortitude Transformations Ltd | Professional & scientific | 2021 |
| Fortmews Limited | Real estate | 1999 |
| Fortress Accountancy Services Ltd | Professional & scientific | 2014 |
| Fortress Assets Limited | Real estate | 2018 |
| Fortrex Ltd | Information & communication | 2024 |
| Fortron International Limited | Wholesale & retail | 1997 |
| Fortune Delight Limited | Hospitality | 2023 |
| Fortune Group of Companies Ltd | Real estate | 2022 |
| Fortune Prime Ltd | Wholesale & retail | 2026 |
| Fortune Store Ltd | Wholesale & retail | 2024 |
| Fortune Work Limited | Hospitality | 2017 |
| Forty 4 Events Limited | Administrative & support | 2025 |
| Forty Four Holdings Ltd | Real estate | 2026 |
| Forty Two Enterprises Limited | Hospitality | 2025 |
| Forty Two Functions Limited | Education | 2026 |
| FORTY2 Technologies Ltd | Professional & scientific | 2019 |
| Fortyashburner Limited | Professional & scientific | 2019 |
| Forum Holding LP | | 2017 |
| Forward Day Services Ltd | Other services | 2011 |
| Forward Electronics Limited | Manufacturing | 1980 |
| Forward Microsystems (Leicester) Limited | Professional & scientific | 2004 |
| Forward Microsystems (Properties) Limited | Real estate | 2019 |
| Forward Microsystems Limited | Information & communication | 1984 |
| Forward Plus West Midlands Ltd. | Health & social care | 2017 |
| Forward Thinking Movement and Dance CIC | Arts & recreation | 2013 |
| Forwardculture CIC | Education | 2016 |
| Forza X Limited | Professional & scientific | 2024 |
| Fosse Accountants Limited | Professional & scientific | 2011 |
| Fosse Adprac Ltd | Administrative & support | 2014 |
| Fosse Asset Finance Limited | Wholesale & retail | 2008 |
| Fosse Bar Limited | Hospitality | 2024 |
| Fosse Bits Limited | Professional & scientific | 2022 |
| Fosse Building (Leicester) Management Company Limited | Real estate | 2005 |
| Fosse Demolition Contracts Limited | Construction | 2021 |
| Fosse Electrics (UK) Ltd | Construction | 2026 |
| Fosse Electronics Ltd | Wholesale & retail | 2019 |
| Fosse Fitness 365 Limited | Arts & recreation | 2012 |
| Fosse Golf Company(Leicester)Limited(The) | Real estate | 1903 |
| Fosse Group Ltd | Construction | 2024 |
| Fosse Healthcare Limited | Health & social care | 2002 |
| Fosse Limited | Wholesale & retail | 2001 |
| Fosse Medics Ltd | Health & social care | 2024 |
| Fosse Mini Market Ltd | Wholesale & retail | 2025 |
| Fosse OIL Heating and Plumbing Services Ltd | Construction | 2011 |
| Fosse Plumbing and Heating Ltd | Construction | 2025 |
| Fosse Recruitment Limited | Administrative & support | 2000 |
| Fosse Rentals Limited | Administrative & support | 2025 |