| Fafu Ltd | Information & communication | 2024 |
| Fairy Deals Ltd | Wholesale & retail | 2024 |
| Fairytouches Ltd | Administrative & support | 2023 |
| Falcon Group Engineering Ltd | Construction | 2026 |
| Fallowcourt West Limited | Real estate | 2014 |
| Family First Bidco Limited | Financial services | 2022 |
| Family First Day Nurseries Limited | Education | 2017 |
| Family First Flex Limited | Education | 2020 |
| Family First Topco Limited | Financial services | 2022 |
| Fanassa Limited | Real estate | 1985 |
| Farai Ltd | Health & social care | 2023 |
| Fari Court RTM Company Limited | Households | 2016 |
| Farm Fest Ltd | Administrative & support | 2025 |
| Farrell Design Studio Ltd | Professional & scientific | 2018 |
| Farrell Technology Ltd | Administrative & support | 2018 |
| Fast FIX Installations Ltd | Construction | 2023 |
| Fastspeed Couriers Ltd | Transport & logistics | 2015 |
| FCC Trade Ltd | Wholesale & retail | 2025 |
| FCL Welwyn Ltd | Education | 2021 |
| Feast Fusion Ltd | Hospitality | 2024 |
| Featherstone London Limited | Other services | 2024 |
| Fens Commercial Limited | Construction | 2025 |
| Fens Group (Holdings) Limited | Financial services | 2025 |
| Fens Reinstatements Limited | Construction | 2025 |
| Fewchrproof Ltd | Administrative & support | 2024 |
| FGL Properties Ltd | Real estate | 2025 |
| Fibregig Consulting Ltd | Information & communication | 2019 |
| Fieldsource Group Ltd | Administrative & support | 2022 |
| Fieldsource Ltd | Administrative & support | 2018 |
| Film Masters Ltd | Information & communication | 2021 |
| Finan HR Services Ltd | Professional & scientific | 2014 |
| Financial Performance Solutions Ltd | Information & communication | 2013 |
| Finder Media & Technology Limited | Information & communication | 2011 |
| Finder Media Limited | Information & communication | 2010 |
| Fine Point Solutions Ltd | Construction | 2024 |
| Fingerprint FO+ Limited | Manufacturing | 1998 |
| Finial Developments Limited | Wholesale & retail | 2009 |
| Finotive Ltd | Real estate | 2020 |
| Fintech SEO Solutions Ltd | Information & communication | 2024 |
| Fire Horse Development Ltd | Construction | 2026 |
| Fire Risk Assessment and Electrical Compliance Ltd. | Professional & scientific | 2023 |
| First Assets Holdings Ltd | Real estate | 2025 |
| First Impressions Cleaning Services Limited | Administrative & support | 2023 |
| First Line Drains Ltd | Construction | 2024 |
| Fitzrovia Management Ltd | Professional & scientific | 2015 |
| Five of Herts Property Ltd | Households | 2025 |
| Flendy Limited | Transport & logistics | 2021 |
| Flodoc Ltd | Construction | 2025 |
| Flooring Your Home Limited | Wholesale & retail | 2023 |
| Florere Investments Limited | Construction | 2025 |
| Flow & Glow Lymph Therapy Ltd | Health & social care | 2025 |
| Flower Freight Limited | Transport & logistics | 1999 |
| Flowpoint Analytics Ltd | Information & communication | 2022 |
| Fluent Writes Ltd | Wholesale & retail | 2024 |
| Fluorotec Limited | Professional & scientific | 2017 |
| FM Immortal Ltd | Arts & recreation | 2023 |
| FMG Housing Ltd | Real estate | 2025 |
| Focus Global Trading Limited | Administrative & support | 2010 |
| Fodabox Limited | Wholesale & retail | 2011 |
| Follicle Hair Ltd | Wholesale & retail | 2025 |
| Food Adventure Group Limited | Wholesale & retail | 2017 |
| Footings Limited | Construction | 2024 |
| Footsteps Day Nurseries Holdings Limited | Education | 2021 |
| Footsteps Day Nurseries Limited | Education | 2004 |
| Footsteps Stafford Limited | Education | 2016 |
| Fordshire Healthcare Limited | Health & social care | 2022 |
| Forella Limited | Wholesale & retail | 2024 |
| Forever Young People Media Ltd | Manufacturing | 2022 |
| Forever Young People Mentoring Services Ltd | Education | 2021 |
| Fortress Media Limited | Wholesale & retail | 2021 |
| Fountnursery Ltd | Education | 2014 |
| Four Seasons Nursery & Pre-School CIC | Education | 2023 |
| Frances Grace Consulting Limited | Professional & scientific | 2017 |
| French and Lines Limited | Construction | 2010 |
| Frent Ltd | Information & communication | 2024 |
| Freshfields Nursery Schools Limited | Education | 2002 |
| Freshly Brewed Ltd | Professional & scientific | 2021 |
| Fried & Grilled Chicken Ltd | Hospitality | 2023 |
| Friendly Crown Ltd | Wholesale & retail | 2026 |
| Fright Industries Ltd | Real estate | 2025 |
| Frkm Ltd | Construction | 2024 |
| Fruitech Solutions Ltd | Manufacturing | 2023 |
| Fruitpad Media Limited | Information & communication | 2021 |
| Fspn Properties Limited | Real estate | 2017 |
| Ftcn Ltd | Real estate | 2020 |
| Full Living Limited | Extraterritorial | 2015 |
| Funnybones Foodservice Limited | Hospitality | 1989 |
| FUSED365 Ltd | Information & communication | 2024 |
| Fusion Corporate Partners (UK) Limited | Administrative & support | 2011 |
| Fusion Kleen Ltd | Construction | 2020 |
| Future Electric Finance Limited | Financial services | 2013 |
| Future Removals Ltd | Transport & logistics | 2022 |
| FUW Real Estate Group Ltd | Real estate | 2024 |
| G & B Autos Ltd | Wholesale & retail | 2012 |
| G M Leisure Management Services Limited | Professional & scientific | 2018 |
| G Way Contracts Ltd | Construction | 2019 |
| G&Gbrown Ltd | Manufacturing | 2025 |
| G&J Group Ltd | Wholesale & retail | 2026 |
| G.A.C. Projects Limited | Construction | 2025 |
| G.M.I. Aerials Limited | Construction | 2002 |