| Farranti Limited | Information & communication | 2010 |
| Farvera Ltd | Construction | 2023 |
| Farz Investments Limited | Real estate | 2023 |
| FAS & KAS Ltd | Other services | 2008 |
| Fasna Immigration & Consultants Limited | Professional & scientific | 2025 |
| Fast & Simple IT Limited | Information & communication | 2015 |
| Fast ETA Limited | Transport & logistics | 2017 |
| Fast EU Corps Limited | Extraterritorial | 2019 |
| Fast Forward Logistics Limited | Transport & logistics | 2024 |
| Fast IT Services Ltd | Information & communication | 2017 |
| Fast Rail OCS Ltd | Professional & scientific | 2023 |
| Fastremoval Limited | Transport & logistics | 2025 |
| Fastset Ltd | Construction | 2023 |
| Fastwheels Limited | Transport & logistics | 2010 |
| FAT GUY JIU Jitsu Ltd | Wholesale & retail | 2025 |
| FAT MAN Design Limited | Professional & scientific | 2010 |
| Fatboyoz Ltd | Wholesale & retail | 2023 |
| Fatema Trading Ltd | Wholesale & retail | 2024 |
| Favbet Invest LLP | | 2012 |
| FAY Sweepers Ltd. | Administrative & support | 2024 |
| Fayaz Rashid Ltd | Health & social care | 2016 |
| Fayz Ltd | Information & communication | 2015 |
| Fazelat Properties Ltd | Real estate | 2021 |
| FB Insight Ltd | Professional & scientific | 2013 |
| FBM Build Ltd | Construction | 2021 |
| FBM Electrical Ltd | Construction | 2015 |
| FC Platinum Accommodation Ltd | Real estate | 2022 |
| FCD Electrical Ltd | Construction | 2025 |
| FCP Hospitality Limited | Administrative & support | 2026 |
| FD Finance Ltd | Professional & scientific | 2022 |
| FDA Limited | Extraterritorial | 1998 |
| FDK Consulting Services Limited | Administrative & support | 2017 |
| FDL Netsolutions Limited | Information & communication | 2017 |
| Fdrs Grill Limited | Hospitality | 2025 |
| FDS Solutions Limited | Information & communication | 2012 |
| Fearnwood Construction Limited | Construction | 2001 |
| Featherstone Cairns Limited | Information & communication | 2015 |
| Feature Friday Holdings Ltd | Arts & recreation | 2024 |
| Fedepi Ltd | Information & communication | 2014 |
| Federal & European Group Limited | Construction | 1983 |
| Federallogisticsuk Ltd | Transport & logistics | 2026 |
| Feeling Mutual Limited | Professional & scientific | 2010 |
| Fehal Global Products Sale Ltd | Wholesale & retail | 2026 |
| Fekri Holdings Ltd | Real estate | 2025 |
| Feldman & Feldman (RF) Limited | Professional & scientific | 2003 |
| Felis Construction Ltd | Construction | 2022 |
| Fellow Carer Ltd | Health & social care | 2024 |
| Fellows Talent Solutions Ltd | Real estate | 2024 |
| Feminity Savage Ltd | Wholesale & retail | 2026 |
| Femtalent Ltd | Other services | 2020 |
| Fencing Hertfordshire CIC | Education | 2016 |
| Fener Cafe Ltd | Hospitality | 2026 |
| Feniks Limited | Construction | 2014 |
| Fenleys Ltd | Professional & scientific | 2002 |
| Fennecmedia Ltd | Information & communication | 2021 |
| Fentech Management Limited | Administrative & support | 2017 |
| Fentech Systems Limited | Extraterritorial | 2017 |
| Fenton Film Limited | Information & communication | 2022 |
| Feoni Ltd | Administrative & support | 2017 |
| Ferdinando Verderi Studio UK Ltd | Professional & scientific | 2021 |
| Ferguson Consultancy Limited | Professional & scientific | 2017 |
| Ferhat Stores Limited | Wholesale & retail | 2015 |
| Fernandes and Richards Consulting Limited | Information & communication | 2018 |
| Fernfutures Ltd | Administrative & support | 2017 |
| Feroria Limited | Wholesale & retail | 2017 |
| Feros Kitchen Ltd | Hospitality | 2024 |
| Ferrobyte Ltd | Professional & scientific | 2024 |
| Ferry Contracting Ltd | Other services | 2018 |
| Fertilico Ltd | Health & social care | 2019 |
| Festive Market Ltd | Wholesale & retail | 2026 |
| Festmarc Property Holdings LLP | | 2022 |
| Fettishaw Properties Limited | Construction | 1971 |
| Fezziwigs Four Seasons Limited | Wholesale & retail | 2024 |
| FF Distribution Ltd | Construction | 2026 |
| FF Management Solutions Ltd | Construction | 2013 |
| FFG Legal Limited | Professional & scientific | 2025 |
| Ffuosky Company Limited | Health & social care | 2023 |
| Fharco Limited | Administrative & support | 2012 |
| FHH Advisory Ltd | Financial services | 2024 |
| Fibreops Ltd | Construction | 2021 |
| Fibrewave Broadband Ltd | Information & communication | 2023 |
| Fida Car Limited | Administrative & support | 2025 |
| Fides HZ Ltd | Real estate | 2022 |
| Fidu Consultancy Limited | Extraterritorial | 2019 |
| Fiduciam Advisory Limited | Professional & scientific | 2023 |
| Field Gate House and Mews 2 RTM Company Limited | Administrative & support | 2010 |
| Fieldcrown Developments 1 Ltd | Construction | 2019 |
| Fieldcrown Developments Limited | Construction | 1999 |
| Fieldworkhub Ltd | Professional & scientific | 2018 |
| Fievel Healthcare Limited | Other services | 2015 |
| Fifthstreet Limited | Professional & scientific | 1992 |
| FIG Ventures Ltd | Real estate | 2015 |
| Fightscope AI Ltd | Information & communication | 2026 |
| Fikile Care Provider Limited | Health & social care | 2014 |
| Filatov Group Ltd | Information & communication | 2018 |
| Filby Sound & Vision Limited | Information & communication | 2015 |
| Film Nouveau Ltd | Information & communication | 2012 |
| Filter Theatre | Arts & recreation | 2009 |
| Filtrans Express Ltd | Transport & logistics | 2026 |
| Fimag Ltd | Construction | 2025 |