| Forric Homes (Budle Bay) Ltd | Construction | 2026 |
| Forric Homes (Hamsterley) 1 Ltd | Real estate | 2025 |
| Forric Homes (Hamsterley) Limited | Construction | 2021 |
| Forric Homes (Riding Mill) Limited | Construction | 2021 |
| Forric Homes (Rowlands Gill) Ltd | Construction | 2023 |
| Forric Homes (Ulgham) Ltd | Construction | 2023 |
| Forric Homes Ltd. | Construction | 1991 |
| Forric Properties Limited | Real estate | 2023 |
| Forster Court Management Company Limited | Real estate | 2000 |
| Forster Jones Consulting Limited | Professional & scientific | 2022 |
| Forsters Waste Site Limited | Real estate | 2018 |
| Forsyth Properties (UK) Limited | Real estate | 1998 |
| Forte Sales and Marketing Ltd | Professional & scientific | 2011 |
| Forth Assets Realty Limited | Financial services | 2023 |
| Forth England Limited | Administrative & support | 2012 |
| Forthcastle LLP | | 2004 |
| Fortify ES Ltd | Administrative & support | 2025 |
| Fortioris Enterprise Ltd | Wholesale & retail | 2021 |
| Fortis Green Energy Limited | Professional & scientific | 2016 |
| Fortress Dwellings & Estates Ltd | Real estate | 2022 |
| Fortuna Dominium Limited | Professional & scientific | 2024 |
| Fortuna Gaming Limited | Professional & scientific | 2017 |
| Fortuna Homes Limited | Real estate | 2023 |
| Fortune 2025 Limited | Hospitality | 2025 |
| FORTUNE100 Limited | Wholesale & retail | 2018 |
| Fortunegenie.Pvt Limited | Real estate | 2015 |
| Forty Two Project Site Services Ltd | Professional & scientific | 2019 |
| Forza Basso Ltd | Wholesale & retail | 2017 |
| FOS Tech Engineering Services Ltd | Construction | 2018 |
| Fosso (UK) Ltd. | Construction | 2011 |
| Fossway Tandoori Ltd | Hospitality | 2025 |
| Fossway Tandoori Takeaway Ltd | Hospitality | 2025 |
| Fossway Turbinia Limited | Hospitality | 2019 |
| Foster Findlay Associates (EBT) Limited | Extraterritorial | 2011 |
| Foster Findlay Associates Limited | Information & communication | 1987 |
| Fosters Tyres Ltd | Wholesale & retail | 2011 |
| Fotos for Art Ltd | Arts & recreation | 2022 |
| Found in Translation Ltd | Professional & scientific | 2023 |
| Found IT Limited | Professional & scientific | 2005 |
| Foundation Chiropractic Limited | Health & social care | 2017 |
| Foundation Futures Community Interest Company | Education | 2014 |
| Foundational Years CIC | Education | 2026 |
| Foundations Building Services Ltd | Extraterritorial | 2020 |
| Founders Place LLP | | 2020 |
| Foundry Farm Country Getaways Ltd | Hospitality | 2025 |
| Foundry Farm Holidays Ltd | Hospitality | 2023 |
| Fountains Walk Residents Management Company Limited | Real estate | 2024 |
| Four Flat Fish Ltd | Information & communication | 2010 |
| Four Lane Enterprises Ltd | Professional & scientific | 2023 |
| Four Leaf Clothing Ltd | Wholesale & retail | 2025 |
| Four Q'S Security Ltd | Administrative & support | 2026 |
| Four Seasons Agriculture Ltd | Agriculture & fishing | 2025 |
| Four Seasons Lounge Ltd | Hospitality | 2019 |
| Four Walls PR Limited | Professional & scientific | 2017 |
| Foutah Djallon Cleaning Services Ltd | Administrative & support | 2025 |
| Fowbery Auto Bodyshop Limited | Construction | 2025 |
| FOX Red Property Ltd | Real estate | 2024 |
| FOX Tooth Tattoo Limited | Other services | 2023 |
| Foxhills Consulting Limited | Professional & scientific | 2020 |
| Foximedics Limited | Health & social care | 2007 |
| Foxton Capital Limited | Professional & scientific | 2013 |
| Foxton Court Maintenance Limited | Households | 1976 |
| Foxton's Estates Limited | Real estate | 2023 |
| Foxwood Court, Lanchester (Management) Limited | Households | 2002 |
| FP (Manchester) Ltd | Hospitality | 2026 |
| FP (Newcastle) Ltd | Hospitality | 2024 |
| FP Experiences Ltd | Hospitality | 2018 |
| FP Realisations 2025 Ltd | Manufacturing | 1996 |
| FPC Realisations Limited | Manufacturing | 1992 |
| FPP Design Limited | Professional & scientific | 1996 |
| FPP Group Limited | Professional & scientific | 1997 |
| FPS Energy Solutions Ltd | Professional & scientific | 2025 |
| Fracado Ltd | Administrative & support | 2016 |
| Fractals Co-Operative Ltd | Professional & scientific | 2022 |
| Fraction ERP Ltd | Information & communication | 2020 |
| Fradley Residential LLP | | 2015 |
| Fragrance OIL Studio Ltd | Administrative & support | 2018 |
| Fragrant Harbour Limited | Real estate | 2001 |
| Fraine F TIC | Financial services | 2026 |
| Fraine Family PIC | Financial services | 2026 |
| Frame of Mind (Vocational Training) CIC | Manufacturing | 2006 |
| Framewerk Ltd | Information & communication | 2003 |
| Framlington Place Limited | Real estate | 2026 |
| Franbo Cleaning Care Ltd | Administrative & support | 2015 |
| Francesca's Barrow Ltd | Hospitality | 2024 |
| Franchise Catering Limited | Hospitality | 2019 |
| Francis Cloud Consulting Ltd | Information & communication | 2014 |
| Francy AC Limited | Wholesale & retail | 2025 |
| Francy Coffee Company Limited | Wholesale & retail | 2023 |
| Frangofrango Ltd | Wholesale & retail | 2023 |
| Frank & Bird Ltd | Hospitality | 2014 |
| Frank Damiani Limited | Financial services | 2015 |
| Frank Fagleman Jewellers Limited | Wholesale & retail | 2009 |
| Frank Recruitment Group Limited | Financial services | 2013 |
| Frank Recruitment Group Services Limited | Administrative & support | 2012 |
| Frank Recruitment Group Services USA Ltd | Financial services | 2016 |
| Frank Recruitment Group UK Services Limited | Administrative & support | 2018 |
| Frankfield Mews (Great Ayton) Management Company Limited | Households | 2002 |
| Frankham Farm (Fourstones) Management Company Limited | Households | 2015 |
| Frankie and Tonys Sandwich Bar Ltd | Hospitality | 2019 |