| Falagtey Limited | Health & social care | 2022 |
| Falaran Limited | Wholesale & retail | 2024 |
| Falcan Limited | Professional & scientific | 2020 |
| Falco Global Holdings Group Limited | Water & waste | 2021 |
| Falcon Fairways Limited | Professional & scientific | 2018 |
| Falcon Imports Ltd | Wholesale & retail | 2017 |
| Falcon IT Limited | Information & communication | 2003 |
| Falcon LT Holding Limited | Financial services | 2025 |
| Falcon Stuart Limited | Arts & recreation | 1964 |
| Falcon-Spot Ltd | Information & communication | 2023 |
| Fallon's Angler Ltd | Information & communication | 2014 |
| FAM Sugar Living Care Ltd | Health & social care | 2025 |
| Fambrood Cleaning Services Limited | Administrative & support | 2024 |
| Fameeliar Ltd | Information & communication | 2023 |
| Families Feeling Safe Ltd | Education | 2014 |
| Family Angels Social Care & Recruitment Ltd | Health & social care | 2023 |
| Family Bakes Limited | Manufacturing | 2021 |
| Family Shapes Childminder Limited | Extraterritorial | 2022 |
| Family Touch AI Ltd | Information & communication | 2025 |
| Famina Traders Ltd | Wholesale & retail | 2025 |
| Famous Pictures and Features Limited | Arts & recreation | 1997 |
| FAN Club House Band Ltd | Arts & recreation | 2022 |
| Fancy Shine International Ltd | Wholesale & retail | 2021 |
| Fancy Studio Ltd | Information & communication | 2024 |
| Fanergy Ltd | Other services | 2024 |
| Fang Xian Yang Ltd. | Wholesale & retail | 2025 |
| Fanmedia Limited | Extraterritorial | 2006 |
| Fantastic Enterprise Ltd | Wholesale & retail | 2025 |
| FAO Ltd | Health & social care | 2022 |
| FAR Lawrence (Moulsoe) Management Company Limited | Households | 2020 |
| Farah Akmal Holdings Limited | Financial services | 2024 |
| Faran Change Management Ltd | Professional & scientific | 2026 |
| Farasin Limited | Wholesale & retail | 2024 |
| Fardotec Ltd | Information & communication | 2023 |
| Fareham Car Hire Limited | Administrative & support | 2018 |
| Farhan Construction Ltd | Construction | 2026 |
| Farhanas Beauty & Aesthetics Limited | Other services | 2023 |
| Farho UK Limited | Manufacturing | 2016 |
| Farlando Ltd | Other services | 2023 |
| Farm Day Nurseries Ltd | Health & social care | 2020 |
| Farm Garages Limited | Wholesale & retail | 1996 |
| Farm Support Ltd | Agriculture & fishing | 2024 |
| Farma Biosciences Ltd | Professional & scientific | 2020 |
| Farmann Limited | Construction | 1983 |
| Farmers Private Hire Ltd | Administrative & support | 2017 |
| Farmers Vehicle Engineers Ltd | Wholesale & retail | 2018 |
| Farmk Foods Ltd | Hospitality | 2025 |
| Farringdon Finance Limited | Financial services | 2026 |
| Farthing Brothers Limited | Hospitality | 2022 |
| Farview Consulting Limited | Professional & scientific | 2026 |
| Faryaab Capital Ltd | Wholesale & retail | 2021 |
| Faryhoun Ltd | Wholesale & retail | 2022 |
| FAS Consultancy Limited | Hospitality | 2025 |
| Fascia Fusion Ltd | Construction | 2024 |
| Fashion Desk Studio Limited | Wholesale & retail | 2025 |
| Fashion Finesse Limited | Wholesale & retail | 2002 |
| Fashnetic Ltd | Wholesale & retail | 2024 |
| Fast Cabz Limited | Transport & logistics | 2025 |
| Fast Fibre Limited | Extraterritorial | 2012 |
| Fast Lane Recovery Ltd | Transport & logistics | 2026 |
| Fast Leaflet Drop Ltd | Professional & scientific | 2026 |
| Fast Rabbit Transport Ltd | Transport & logistics | 2024 |
| Fast Reliable Transport Ltd | Transport & logistics | 2020 |
| Fast Taxis MK Ltd | Transport & logistics | 2019 |
| Fast Track Driver Training Limited | Education | 2025 |
| Fast Transflex Ltd | Transport & logistics | 2025 |
| Fastandeazy Ltd. | Information & communication | 2017 |
| Fastax Accountants Ltd | Professional & scientific | 2021 |
| Fastbolt Distributors (UK) Limited | Wholesale & retail | 1982 |
| Fastbox International Transport Limited | Transport & logistics | 2016 |
| Faster Currents Limited | Hospitality | 2022 |
| Fastfit Station MK Ltd | Wholesale & retail | 2014 |
| Fastfoodonthego Ltd | Hospitality | 2025 |
| Fastlift Logistics Ltd | Transport & logistics | 2019 |
| FAT Albert Limited | Manufacturing | 2024 |
| FAT Cat Grafix Limited | Construction | 2009 |
| FAT Twins Reading Ltd | Hospitality | 2022 |
| Fatboy Creative Ltd | Professional & scientific | 2020 |
| Fathiya Ltd | Transport & logistics | 2025 |
| FATIM4 Barbers Limited | Other services | 2023 |
| Fato Solutions Ltd | Information & communication | 2026 |
| Faulconbridge, Lonnergan Enterprises Ltd | Wholesale & retail | 2013 |
| Faulkners Catering Consultancy Ltd | Hospitality | 2002 |
| Faulty Learning Limited | Professional & scientific | 2009 |
| Faustjack Ltd | Health & social care | 2020 |
| Faux King Florals Ltd | Wholesale & retail | 2025 |
| Favar 24 EU Ltd | Information & communication | 2023 |
| Favoreats Limited | Hospitality | 2020 |
| Favoured Ltd | Professional & scientific | 2009 |
| Favouritizm Ltd | Professional & scientific | 2002 |
| Favours Day Nursery Holdings Limited | Health & social care | 2016 |
| Fawcett Transport Limited | Transport & logistics | 2007 |
| Faybre Ltd | Health & social care | 2021 |
| Faymal Limited | Real estate | 2019 |
| Fazal Subhan Ltd | Wholesale & retail | 2022 |
| FB Realisations 2024 Limited | Wholesale & retail | 2023 |
| FBA Sparkle Services Ltd | Administrative & support | 2026 |
| Fchizer Ltd | Wholesale & retail | 2015 |
| FCI INT Ltd | Information & communication | 2023 |
| FCM Properties Limited | Real estate | 2004 |