| FLY Digital Limited | Information & communication | 2014 |
| FLY Inc Ltd | Information & communication | 2026 |
| Flying Projects Limited | Information & communication | 2018 |
| Flytrek Limited | Other services | 1990 |
| Flávia Mayer Design & Illustration Ltd | Professional & scientific | 2018 |
| Fm-Networks Ltd | Information & communication | 2023 |
| Focus Engineering Design Limited | Professional & scientific | 2023 |
| Focus Fabrications Limited | Construction | 2001 |
| Focus Finishing Ltd | Manufacturing | 2025 |
| Focus Secure Limited | Administrative & support | 2024 |
| Folde Dorset Limited | Wholesale & retail | 2020 |
| Fontaine Acquisitions Ltd | Real estate | 2021 |
| Fontaine Brothers LLP | | 2022 |
| Fontaine Capital Ltd | Construction | 2019 |
| Fontaine Group Ltd | Financial services | 2021 |
| Fontaine Holdings Limited | Financial services | 2024 |
| Fontaine Sourcing Ltd | Administrative & support | 2023 |
| Fontaine Stays Ltd | Real estate | 2024 |
| Foobarbaz Ltd | Information & communication | 2017 |
| Footering & Guddling Ltd | Wholesale & retail | 2015 |
| FOR the Love of GUT Limited | Wholesale & retail | 2025 |
| FOR the Wing Limited | Information & communication | 2019 |
| Force 44 Limited | Administrative & support | 2010 |
| Ford CE Limited | Financial services | 2020 |
| Ford Civil Engineering Holdings Limited | Professional & scientific | 2007 |
| Ford Civil Engineering Limited | Construction | 1982 |
| Ford Civils Ltd | Financial services | 2024 |
| Foreman Plumbing & Heating Services Limited | Construction | 2024 |
| Foreseen UK Limited | Information & communication | 2024 |
| Forest in the Tree Limited | Information & communication | 2018 |
| Forest Logistics Limited | Transport & logistics | 2009 |
| Forest Machinery Limited | Wholesale & retail | 2023 |
| Forest North Farms Limited | Agriculture & fishing | 1998 |
| Forest North Holdings Limited | Financial services | 1998 |
| Forest North Inns Limited | Hospitality | 1998 |
| Forged Collective Ltd | Health & social care | 2025 |
| Form & Function Creative Studio Ltd | Professional & scientific | 2013 |
| Form-Ai Limited | Education | 2022 |
| Forming Designs Ltd | Administrative & support | 2023 |
| Formulate Limited | Information & communication | 2014 |
| Fortberg Ltd | Real estate | 2022 |
| Forte Project Management Ltd. | Professional & scientific | 2008 |
| Fortis Ventures Ltd | Wholesale & retail | 2023 |
| Fortune Capital Ltd | Wholesale & retail | 2021 |
| Fortx Limited | Information & communication | 2013 |
| Forum Jewellers Limited | Wholesale & retail | 2002 |
| Forward and Holland Sporting Limited | Other services | 2017 |
| Forward Thinking Consulting Ltd | Information & communication | 2026 |
| Fotheringay Solutions Limited | Information & communication | 2025 |
| Foundation Stone LLP | | 2007 |
| Fountain Lofts Ltd | Real estate | 2022 |
| Four Cats Limited | Hospitality | 2021 |
| Four Seven Advisory Ltd | Professional & scientific | 2026 |
| Fowler and Fowler Accountants Limited | Professional & scientific | 2023 |
| Fowler and Fowler Investments Limited | Financial services | 2022 |
| FOX Field Farm Dorset Limited | Agriculture & fishing | 2024 |
| FOX Lane Engineering Services Limited | Professional & scientific | 2011 |
| FOX View Management Company Limited | Households | 2026 |
| Foxcroft (Oakley Garden Village) Management Company Limited | Households | 1978 |
| Foxcroft Freehold Limited | Households | 2012 |
| Foxilifestyles Ltd | Extraterritorial | 2020 |
| Foxwood Property Company Ltd | Real estate | 2019 |
| Foxy Lady Drivers Club Limited | Other services | 2012 |
| Foxy Lady Limited | Other services | 2006 |
| FP Wealth Management Limited | Financial services | 2004 |
| FPC (Ferndown) Limited | Manufacturing | 2021 |
| Fractalometry Limited | Information & communication | 2015 |
| Fractional Sales Ltd | Information & communication | 2024 |
| Fragment 46 Limited | Information & communication | 2007 |
| Fragorum Fields Freehold Limited | Real estate | 2021 |
| Frampton's Courtyard Flats Limited | Households | 2022 |
| Frampton's Courtyard Limited | Households | 2022 |
| Frampton's Creative Ltd | Information & communication | 2025 |
| Franc. Bridal Ltd | Wholesale & retail | 2025 |
| Frankham Ltd | Information & communication | 2019 |
| FRD Designers & Makers Limited | Administrative & support | 2009 |
| Fred & Fred Ltd | Administrative & support | 2023 |
| Free From Travel Limited | Administrative & support | 2024 |
| Freemind Innovation Ltd | Information & communication | 2004 |
| Frenches Green (Upton) Management Company Limited | Households | 2016 |
| Frens Studio Ltd | Professional & scientific | 2026 |
| Fresco Digital Ltd | Information & communication | 2022 |
| Freshleaf Media Limited | Information & communication | 2007 |
| Froggle Limited | Administrative & support | 2005 |
| From Harm to Healing Limited | Health & social care | 2024 |
| Frontdale Limited | Households | 1978 |
| Frontier Dynamics Limited | Information & communication | 1996 |
| Frontier FOX Ltd | Information & communication | 2015 |
| Frontier Healthcare Services Ltd | Professional & scientific | 2024 |
| Frontier Solutions Group Ltd | Professional & scientific | 2021 |
| Frontline Manufacturing Services Ltd | Manufacturing | 1998 |
| Frost Golf Limited | Arts & recreation | 2008 |
| FSK Investments Limited | Real estate | 2017 |
| Fulcrum Facilities Ltd | Administrative & support | 2024 |
| Full Contact Limited | Professional & scientific | 2013 |
| Fuller Treacy Money Limited | Information & communication | 2013 |
| Fully Worded Limited | Information & communication | 2020 |
| Furusa Consulting Ltd | Information & communication | 2026 |
| Furyan Marine Technology Limited | Manufacturing | 2020 |
| Fusedale Ltd | Professional & scientific | 2023 |