| FIN Technet Ltd | Information & communication | 2012 |
| Finance Philosophy Ltd | Professional & scientific | 2015 |
| Finchley Court Freeholders Limited | Real estate | 1981 |
| Find a Coach Ltd | Education | 2022 |
| Find Your Industry Ltd | Manufacturing | 2025 |
| Findgoodcare Ltd | Health & social care | 2019 |
| Findikci Ltd | Wholesale & retail | 2021 |
| Fine Building & Hire Limited | Financial services | 1967 |
| Finepoint Glass London Ltd | Construction | 2013 |
| Finesse London 018 Limited | Wholesale & retail | 2020 |
| Finesse Studios Limited | Other services | 2012 |
| Finest Properties (NW) Ltd | Real estate | 2018 |
| Finest Properties Two ( NW2) Ltd | Real estate | 2018 |
| Fingertips Administration Limited | Other services | 2015 |
| Finish Decorating Limited | Construction | 2025 |
| Fink Tank Ltd | Information & communication | 2013 |
| Finley Temple Williams Ltd | Extraterritorial | 2024 |
| Finologie Limited | Information & communication | 2021 |
| Finoptions Consulting Ltd | Information & communication | 2011 |
| Finora Consultancy Limited | Professional & scientific | 2023 |
| Fintech Fusion Consultancy Limited | Professional & scientific | 2024 |
| Fintechlab Group Ltd | Information & communication | 2018 |
| Finwiz Ltd | Information & communication | 2024 |
| Finyte Limited | Professional & scientific | 2025 |
| Fircroft Tree Surgery Limited | Agriculture & fishing | 2014 |
| Fire and Security Integrated Solutions Ltd | Administrative & support | 2017 |
| Fire Art (UK) Limited | Professional & scientific | 2022 |
| Fire Art International Limited | Professional & scientific | 2018 |
| Fire Safe FM Ltd | Construction | 2024 |
| Fire Systems Management Ltd | Construction | 2021 |
| Fireaway Woodhouse Limited | Hospitality | 2021 |
| Firebird Property Ltd | Real estate | 2019 |
| Firecrest Consulting Limited | Information & communication | 2015 |
| Firefly Associates Limited | Professional & scientific | 2013 |
| Firehand Limited | Arts & recreation | 2015 |
| Firestone Estates Limited | Construction | 2002 |
| Firetechzone Ltd | Other services | 2017 |
| Firm Mentality Limited | Professional & scientific | 2016 |
| Firmo Management Limited | Households | 2014 |
| First Engineering MEP LP | | 2017 |
| First Gear Limited | Wholesale & retail | 1995 |
| First Stop Forensics Ltd | Professional & scientific | 2020 |
| First UK House Ltd | Real estate | 2021 |
| Firstline Motor Cycles Limited | Wholesale & retail | 1976 |
| Fiskardo Ltd | Wholesale & retail | 2022 |
| Fiske Human Factors Engineering Limited | Professional & scientific | 2014 |
| Fit OUT London Limited | Construction | 2019 |
| Fitliftride Ltd | Manufacturing | 2024 |
| Fitness Workspace Limited | Arts & recreation | 2018 |
| Fitzroy-It Ltd | Information & communication | 2015 |
| Five Conversation Styles Limited | Professional & scientific | 2018 |
| Five Highbury Grove Limited | Administrative & support | 1996 |
| Five Intrepid Recruitment Limited | Administrative & support | 2023 |
| Five Rosecroft (Management) Limited | Real estate | 1970 |
| Five Star Nails (Watford) Limited | Other services | 2014 |
| Five Star Nails London Limited | Other services | 2014 |
| FIX Centre Limited | Construction | 2023 |
| FIX IT Smart Ltd | Wholesale & retail | 2023 |
| Fiyorla Ltd | Information & communication | 2026 |
| FJ Sporting Solutions Ltd | Education | 2023 |
| FJM Accountants Ltd | Professional & scientific | 2023 |
| FJM Homes Ltd | Real estate | 2017 |
| FK Division Ltd | Administrative & support | 2024 |
| FKA Holdings Limited | Professional & scientific | 2019 |
| Fknwings Limited | Hospitality | 2025 |
| Flagship Computing Limited | Information & communication | 1997 |
| Flahive Brickwork Holdings Limited | Construction | 2020 |
| Flahive Brickwork Limited | Construction | 1985 |
| Flahive Developments Limited | Real estate | 1981 |
| Flahive Holdings Limited | Real estate | 2018 |
| Flame Embroidery & Print Limited | Professional & scientific | 2014 |
| Flame Limited | Extraterritorial | 2018 |
| Flamingo Healthcare Ltd | Wholesale & retail | 2026 |
| Flamingo Luxury Services Ltd | Education | 2024 |
| Flanm Holdings Ltd | Administrative & support | 2024 |
| Flashing Light Ltd | Professional & scientific | 2020 |
| Flat (1) 206 Gammons Lane Ltd | Real estate | 2019 |
| Flat (2) 206 Gammons Lane Ltd | Real estate | 2019 |
| Flat (3) 206 Gammons Lane Ltd | Real estate | 2019 |
| Flat Five Records Limited | Information & communication | 2018 |
| Flatsapp Limited | Professional & scientific | 2024 |
| Flavour Empire Foods Ltd | Manufacturing | 2022 |
| Flawless E-Commerce Solutions Ltd | Information & communication | 2025 |
| Flawless Gems Ltd | Wholesale & retail | 2020 |
| Fleur Hunt Design Ltd | Construction | 2019 |
| Flexatal Limited | Administrative & support | 2019 |
| Flexedge Consulting Ltd | Real estate | 2025 |
| Flexi Ride Limited | Wholesale & retail | 2022 |
| Flexible Motor Contracts Ltd | Wholesale & retail | 2018 |
| Flexicloud Consulting Limited | Information & communication | 2021 |
| Flexicomm (UK) Limited | Information & communication | 2010 |
| Flexify Digital Ltd | Information & communication | 2023 |
| Flexroyal Magnates Ltd | Construction | 2022 |
| Flexycon LLP | | 2015 |
| FLG Contractors Ltd | Construction | 2015 |
| Flights Cruise & Holiday Ltd | Administrative & support | 2026 |
| Flint Consulting Limited | Information & communication | 1999 |
| Flint Digital Transformation Solutions Ltd | Information & communication | 2026 |
| Flint Dormant Limited | Information & communication | 2022 |
| Flint International Holdings Limited | Information & communication | 2023 |