| F H & G Limited | Professional & scientific | 2005 |
| F M Property Holdings Limited | Real estate | 2019 |
| F.D.L. Properties Limited | Hospitality | 2015 |
| F.D.L.Property Services Ltd | Real estate | 2018 |
| Fabello Ltd | Manufacturing | 2023 |
| Fabric Cleaning and Protection Ltd | Administrative & support | 2010 |
| Fabryan Ltd | Professional & scientific | 2010 |
| Facts Matter Research Limited | Information & communication | 2019 |
| Fairmile Wood Limited | Construction | 2026 |
| Fairview Roofing Services Ltd | Construction | 2025 |
| Falcon Chauffeurs Worldwide Ltd | Administrative & support | 2016 |
| Falcon Legacy Ltd | Professional & scientific | 2025 |
| Falcon Technology Ltd | Construction | 2013 |
| Family Affaire Limited | Administrative & support | 2013 |
| Fancy Hair and Beauty Limited | Other services | 2017 |
| Fantastic Shop Ltd | Wholesale & retail | 2014 |
| Faraz Barber Ltd | Other services | 2016 |
| Faraz Style Barbers Ltd | Other services | 2025 |
| Farco UK Limited | Professional & scientific | 2001 |
| Fargo 1 Limited | Professional & scientific | 2022 |
| Farimax Ltd | Wholesale & retail | 2022 |
| Farina Beauty House Ltd | Wholesale & retail | 2022 |
| Farranshone Development Limited | Construction | 2014 |
| Farringdon (25 Avenue South) Residents Company Limited | Hospitality | 1990 |
| Fashion Arts Music Limited | Information & communication | 2025 |
| FAT Dragon Ltd | Hospitality | 2019 |
| Faww Ltd | Wholesale & retail | 2026 |
| FAY Consulting Limited | Professional & scientific | 2014 |
| Fazal Financial Services Limited | Professional & scientific | 2019 |
| FBA Guru Ltd | Wholesale & retail | 2024 |
| Featherbrooke Training Services Limited | Information & communication | 2023 |
| Featherwish Ltd | Wholesale & retail | 2020 |
| Fedora Investigations (UK) Limited | Administrative & support | 2011 |
| Fekete Research Ltd. | Professional & scientific | 2009 |
| Fendukly Properties Ltd | Real estate | 2017 |
| Fern Court (Tolworth) Limited | Households | 1994 |
| Ferocious Dance Ltd | Information & communication | 2007 |
| Fesavora Ltd | Professional & scientific | 2025 |
| Feshchakhome Ltd | Construction | 2024 |
| Ffwd Agency Limited | Professional & scientific | 2020 |
| Fifty-Eight the Avenue Limited | Households | 2016 |
| Fiinsh Ltd | Information & communication | 2018 |
| Fill Support Ltd | Arts & recreation | 2025 |
| Film Effects Ltd | Professional & scientific | 2022 |
| Filmfair Limited | Information & communication | 2011 |
| FIN4MATION Limited | Professional & scientific | 2015 |
| Financial Risk Consulting Ltd | Professional & scientific | 2019 |
| Finck Global Ltd | Professional & scientific | 2015 |
| Findi Ltd | Professional & scientific | 2017 |
| Finefix Ltd | Manufacturing | 2020 |
| Finetech Consultancy Ltd | Information & communication | 2020 |
| Fingertip Limited | Other services | 2022 |
| Fintech Veterans Limited | Professional & scientific | 2021 |
| Fiordellisi Electrical Ltd | Construction | 2014 |
| Fire-Cubed (FIRE3) LLP | | 2015 |
| Firepro BG Ltd | Public administration | 2026 |
| Firmline Roofing and Building Limited | Construction | 2026 |
| Firmstone Drives & Patios Limited | Construction | 2014 |
| First Perception Ltd | Education | 2022 |
| Fish Creek Software Limited | Information & communication | 2025 |
| Fitness RP Limited | Arts & recreation | 2025 |
| Fitness Thru Sport Limited | Arts & recreation | 2022 |
| Fitted Lifestyles Ltd | Manufacturing | 2018 |
| Fitzrovia Private Staff Ltd | Administrative & support | 2025 |
| FIX and Build Services Ltd | Construction | 2022 |
| FIX King Ltd | Wholesale & retail | 2022 |
| Fjss Limited | Real estate | 2024 |
| Flare Brand Marketing Ltd | Professional & scientific | 2024 |
| Flavourfield Ltd | Hospitality | 2024 |
| Flawless Money Limited | Professional & scientific | 2000 |
| Flipper House Ltd | Wholesale & retail | 2025 |
| Flofolio Limited | Professional & scientific | 2013 |
| Flood Financial Consultancy Ltd | Professional & scientific | 2023 |
| Flourish Landscaping Ltd | Arts & recreation | 2022 |
| Flpe Ltd | Real estate | 2018 |
| Fluent in Energy Limited | Professional & scientific | 2018 |
| Flux Itsm Consultancy Ltd | Information & communication | 2024 |
| FM Legal Limited | Professional & scientific | 2011 |
| FM Trade Limited | Administrative & support | 2016 |
| Fmft Holdings Limited | Information & communication | 2019 |
| FMK Technical Services Limited | Professional & scientific | 2018 |
| Focus Heating Services Limited | Construction | 1998 |
| Focuswize Ltd | Health & social care | 2025 |
| Folkak Ltd | Real estate | 2024 |
| Food Art Fusion Ltd | Hospitality | 2024 |
| Food Art London Ltd | Hospitality | 2024 |
| Foodelish Ltd | Manufacturing | 2020 |
| Foodie Away Limited | Wholesale & retail | 2022 |
| Foodmetric Ltd | Information & communication | 2024 |
| Forbeswallace Ltd | Transport & logistics | 2010 |
| Forefront Executive Search Ltd | Administrative & support | 2025 |
| Forest Hill Retail Limited | Wholesale & retail | 2021 |
| Formative Projects Limited | Professional & scientific | 2024 |
| Forrest Speech and Language Ltd | Education | 2022 |
| Fortemotion Limited | Professional & scientific | 2017 |
| Fortifi Homes Ltd | Information & communication | 2025 |
| Fortis Access Ltd | Administrative & support | 2023 |
| Fortuna Investments Limited | Real estate | 2005 |
| Fossil Works Projects Ltd | Manufacturing | 2022 |
| Fossimo Industries Ltd | Wholesale & retail | 2019 |