| Flint Shareholdings Limited | Information & communication | 2026 |
| Flint UK Technology Services Limited | Information & communication | 2022 |
| Flmf Services Ltd | Administrative & support | 2025 |
| FLO & Cora Ltd | Construction | 2013 |
| FLO Electrical Solution Ltd | Construction | 2024 |
| Floatmast Ltd | Professional & scientific | 2013 |
| Floppy Fellas Ltd | Arts & recreation | 2024 |
| Floralia Fairytale Ltd | Wholesale & retail | 2018 |
| Floren Transfer Ltd | Construction | 2020 |
| Florence Care 24 Ltd | Administrative & support | 2026 |
| Florence Staging Ltd | Professional & scientific | 2026 |
| Florin Tofan Ltd | Construction | 2017 |
| Florinela Services Limited | Wholesale & retail | 2022 |
| Floss Bidco Limited | Financial services | 2019 |
| Floss Midco Limited | Financial services | 2019 |
| Floss Topco Limited | Financial services | 2019 |
| Flourish at Work Limited | Professional & scientific | 2014 |
| Flourish Bookkeeping Services Ltd | Wholesale & retail | 2019 |
| Flourish Commercial Property Ltd | Financial services | 2022 |
| Flourish Craft Bakery Holdings Ltd | Financial services | 2020 |
| Flourish Craft Bakery Ltd | Manufacturing | 2000 |
| Flourish Holdings Ltd | Financial services | 2022 |
| Flourishing Palms Ltd | Real estate | 2026 |
| Flow Caritas Ltd | Administrative & support | 2004 |
| Flow Speed Plumbing Ltd | Construction | 2025 |
| Flowience Technologies Limited | Information & communication | 2026 |
| Flowtech Commissioning Limited | Construction | 2016 |
| Flowtree Limited | Professional & scientific | 2015 |
| Flowwind Events Ltd | Wholesale & retail | 2026 |
| FLS Construction Ltd | Construction | 2026 |
| Fluffy Bunnies Limited | Information & communication | 2014 |
| Fluffy Tailers Limited | Wholesale & retail | 2025 |
| Fluid Glass Limited | Manufacturing | 2022 |
| Fluid Housing Strategies Ltd | Public administration | 2025 |
| Fluid UK Group Limited | Professional & scientific | 2025 |
| Fluid X Limited | Professional & scientific | 2025 |
| Fluidux Limited | Information & communication | 2016 |
| Flush Floors Limited | Construction | 2025 |
| FLX Art Ltd | Information & communication | 2025 |
| FLY Green Aviation Ltd | Professional & scientific | 2023 |
| FLY Phoenix Ltd | Wholesale & retail | 2019 |
| Flyingmedicine Ltd | Professional & scientific | 2014 |
| FM & Co Accountancy Ltd | Professional & scientific | 2012 |
| FMB Properties Limited | Construction | 2016 |
| FND Technical Solutions Ltd | Wholesale & retail | 2024 |
| FNM Student Consultancy Limited | Education | 2026 |
| FNS Construction Ltd | Construction | 2023 |
| FO Properties Ltd | Real estate | 2025 |
| Focal Estates Ltd | Real estate | 2018 |
| Focal Point Intelligence Limited | Information & communication | 2015 |
| Focal Switch Limited | Professional & scientific | 2005 |
| Focalite Enterprise Ltd | Wholesale & retail | 2020 |
| Focus Displays Limited | Manufacturing | 2011 |
| Focus Eyecare Ltd | Wholesale & retail | 2019 |
| Focus Finance Recruitment Limited | Administrative & support | 2014 |
| Focused Insight Limited | Professional & scientific | 2014 |
| Fogaca & Piotto Ltd | Wholesale & retail | 2018 |
| Fohntech UK Limited | Construction | 2017 |
| Folie Limited | Information & communication | 2018 |
| Folly Lane Ltd | Real estate | 2022 |
| Fone Mate Ltd | Wholesale & retail | 2024 |
| Fonestreet Ltd | Wholesale & retail | 2020 |
| Fons Amoris Beverages Ltd | Hospitality | 2016 |
| Fontaine Studios Limited | Information & communication | 2013 |
| Food for ALL | Health & social care | 1999 |
| Food Italy Limited | Wholesale & retail | 2018 |
| Foodislove Ltd | Manufacturing | 2024 |
| Football FAM Ltd | Information & communication | 2023 |
| Footballfest Limited | Administrative & support | 2019 |
| Forbes & Chappell Limited | Wholesale & retail | 2024 |
| Forbes Loyalty & CRM Services Ltd | Professional & scientific | 2013 |
| Force Majeure Limited | Extraterritorial | 2010 |
| Ford Actuarial Consultancy Limited | Professional & scientific | 2015 |
| Foresight Nexus Limited | Financial services | 2025 |
| Forest View Properties Limited | Construction | 2006 |
| Forever Blessed Designs Ltd | Professional & scientific | 2024 |
| Forever Forward Mgmt Ltd | Administrative & support | 2025 |
| Forge Building Services Ltd | Construction | 2024 |
| Forge Built Properties Ltd | Construction | 2026 |
| Fork and Fingers Italian Limited | Hospitality | 2012 |
| Fork Lifts Limited | Manufacturing | 1997 |
| Fork Truck Tyres (Yorkshire) Limited | Wholesale & retail | 2018 |
| Form Agencies Limited | Administrative & support | 2009 |
| Form Distribution Limited | Administrative & support | 2009 |
| Formset Limited | Wholesale & retail | 1998 |
| Forno Dor'O Restaurant Ltd | Hospitality | 2018 |
| Forsnic Limited | Professional & scientific | 2024 |
| Fortcore Ltd | Information & communication | 2024 |
| Forte Holdings Ltd | Financial services | 2023 |
| Forte Property Group Ltd | Real estate | 2022 |
| Fortibury Services Limited | Information & communication | 2022 |
| Fortis Hosting Limited | Information & communication | 2009 |
| Fortis Money Limited | Information & communication | 2023 |
| Fortress Fencing and Digger Hire Limited | Construction | 2026 |
| Fortune Financials Ltd | Professional & scientific | 2022 |
| Fortune World Limited | Real estate | 2021 |
| Fortx One Limited | Financial services | 2018 |
| Forza 4 Ltd | Real estate | 2020 |
| Forza 4.2 Ltd | Real estate | 2020 |
| Founder Enterprise Ltd | Wholesale & retail | 2026 |