| Fersk Procurement Services Limited | Professional & scientific | 2012 |
| Fete Property Group Ltd | Administrative & support | 2021 |
| FHJ Industries Ltd | Hospitality | 2026 |
| Fiction Explorer Limited | Other services | 2018 |
| Field Street Fitness Limited | Arts & recreation | 2017 |
| Field Street Sports Therapy Ltd | Health & social care | 2023 |
| Fieldbrook Properties Limited | Construction | 1999 |
| Fieldfare Law Limited | Professional & scientific | 2025 |
| FIFTY2 Investment Group Limited | Financial services | 2023 |
| Figtree Family Holdings Ltd | Financial services | 2024 |
| Figtree Property Developments Ltd | Real estate | 2023 |
| Figtree Property Ltd | Real estate | 2023 |
| Figtree Stays Ltd | Hospitality | 2023 |
| Figura Analytics Limited | Professional & scientific | 2020 |
| Filaj Investment Ltd | Real estate | 2023 |
| Filip Valentin Logistics Ltd | Transport & logistics | 2018 |
| Fill Voids Limited | Real estate | 2024 |
| Fillis Consultancy Ltd | Administrative & support | 2010 |
| Film Space Digital Ltd | Information & communication | 2021 |
| FIN Developments Limited | Real estate | 2018 |
| Final Whistle Ltd | Arts & recreation | 2019 |
| Finance Home Limited | Financial services | 2018 |
| Financial Answers Limited | Professional & scientific | 2018 |
| Finch Autocare Limited | Wholesale & retail | 2022 |
| Fine Fit Fasteners Limited | Wholesale & retail | 2019 |
| Fine Living Properties Ltd | Real estate | 2023 |
| Fineapple Limited | Professional & scientific | 2021 |
| Finesse Stage and Screen Limited | Arts & recreation | 2024 |
| Finkin Deli Ltd | Wholesale & retail | 2019 |
| Finkins Shepshed Limited | Hospitality | 2023 |
| Finne Groundworks Ltd | Construction | 2022 |
| Finnevie (UK) Limited | Information & communication | 2014 |
| Fiona Davidson Empire Ltd | Other services | 2023 |
| Fiona Davidson Equestrian Services Ltd | Other services | 2023 |
| Fiona Davidson Exports Ltd | Other services | 2023 |
| Fire & Security Marketing Limited | Administrative & support | 2025 |
| Fire and Security Jobs Ltd | Administrative & support | 2020 |
| Fire Risk Evaluation Ltd | Professional & scientific | 2026 |
| Fire Rock Holdings Ltd | Financial services | 2025 |
| Fireagent Ltd | Wholesale & retail | 2026 |
| Fireaway BH Limited | Hospitality | 2026 |
| Firebird Fashion Ltd | Wholesale & retail | 2016 |
| Firecurtains ISM Ltd | Construction | 2024 |
| First Comes Rock Ltd | Other services | 2016 |
| First Gate Solutions Limited | Professional & scientific | 2026 |
| First Light Sales Ltd | Wholesale & retail | 2020 |
| First Step Leisure Limited | Real estate | 1981 |
| First Step Nutrition Ltd | Health & social care | 2023 |
| Fish and Chip Shop Supplies Limited | Financial services | 2022 |
| Fish Mart Ltd | Wholesale & retail | 2022 |
| Fish Property Investments Limited | Real estate | 2018 |
| Fisher Flooring Ltd | Construction | 2018 |
| Fit Friends Ltd | Other services | 2019 |
| Fitcore Consultancy Ltd | Administrative & support | 2016 |
| FITEG2 UK Limited | Wholesale & retail | 2026 |
| Fitfam Media Ltd | Professional & scientific | 2018 |
| Fitness Foremost Limited | Information & communication | 2026 |
| Five Star Nails (Loughborough) Ltd | Other services | 2023 |
| Fixa Ltd | Real estate | 2024 |
| Fixara Limited | Manufacturing | 2025 |
| Fixara Productions Limited | Manufacturing | 2025 |
| Fixin Ltd | Professional & scientific | 2026 |
| Fixit Digitally Ltd | Wholesale & retail | 2021 |
| FJ Operations Ltd | Wholesale & retail | 2025 |
| FKF Contracts Limited | Construction | 2023 |
| Flahey Holdings Ltd | Financial services | 2021 |
| Flambe Circus Limited | Arts & recreation | 2015 |
| Flare of India Ltd | Hospitality | 2026 |
| Flash Coaching Ltd | Education | 2024 |
| Fleeman Court Management Limited | Households | 2016 |
| Fleet Group Holdings Limited | Financial services | 2022 |
| Fleetfit UK Limited | Wholesale & retail | 2025 |
| Flenjor Snacks Ltd. | Wholesale & retail | 2025 |
| Fletcher Consulting (Yorkshire) Ltd | Other services | 2023 |
| Fliccon Limited | Construction | 2007 |
| FLO & Sang Limited | Wholesale & retail | 2009 |
| Flok Jobs Ltd | Information & communication | 2025 |
| Floors Galore Ltd | Construction | 2026 |
| Floors of Stone Limited | Wholesale & retail | 2008 |
| Flora Designs Limited | Manufacturing | 1985 |
| Flore Transport Ltd | Transport & logistics | 2018 |
| Flotec Holdings Limited | Administrative & support | 1999 |
| Flotec Industrial Limited | Administrative & support | 1994 |
| Flotec Trustees Limited | Administrative & support | 2021 |
| Flowergrange Limited | Agriculture & fishing | 1993 |
| Flowers Associates Limited | Hospitality | 2007 |
| Flowjoy Studio Ltd | Information & communication | 2024 |
| Flowtech Heating Ltd | Construction | 2024 |
| Fluentpal Ltd | Information & communication | 2026 |
| Fluffy PLC | Extraterritorial | 2019 |
| Flush Limited | Extraterritorial | 2024 |
| FLY 4 Real Limited | Education | 2019 |
| Flyaway Competitions Limited | Wholesale & retail | 2025 |
| Flying Buttress Architecture Ltd | Professional & scientific | 2013 |
| Flying Frog Media Ltd | Information & communication | 2026 |
| Flying LAP Holdings Ltd | Professional & scientific | 2019 |
| FMC Management Ltd | Administrative & support | 2012 |
| Fmcg-Recruitment & Training Ltd | Administrative & support | 2019 |
| FMS Enterprise Ltd | Real estate | 2024 |
| FMV Property Ltd | Real estate | 2024 |