| Feathercot Groundworks and Maintenance Ltd | Administrative & support | 2025 |
| Feback Solutions Ltd | Professional & scientific | 2015 |
| Federail Limited | Professional & scientific | 2015 |
| Feed Easy Limited | Hospitality | 2011 |
| Feel Free Social Ltd | Information & communication | 2025 |
| Feelin` Groovy Ltd | Administrative & support | 2004 |
| Feida Trading Ltd | Wholesale & retail | 2017 |
| Felix Racing Syndicate Ltd | Arts & recreation | 2024 |
| Felstone Properties Limited | Households | 1971 |
| Femtech Weekend Ltd | Professional & scientific | 2026 |
| Femud Ltd | Health & social care | 2020 |
| Fenix Yachting Ltd | Extraterritorial | 2025 |
| Fenn's Tree Care Ltd | Agriculture & fishing | 2017 |
| Feraru Group Builders Ltd | Construction | 2017 |
| Fergusson House Ltd | Households | 2025 |
| Fericapital Limited | Real estate | 2025 |
| Ferme Haringay Ltd | Real estate | 2025 |
| Fernandes & Fernandes Limited | Hospitality | 2024 |
| Fernwood Events Ltd | Administrative & support | 2023 |
| FEROZE1888 Mills UK Private Limited | Wholesale & retail | 2025 |
| Ferrari Estates Ltd | Real estate | 2020 |
| Ferraris' Property LLP | | 2021 |
| Ferry Lane (London) RTM Company Limited | Real estate | 2026 |
| Fertilife Industry Limited | Wholesale & retail | 2015 |
| Fetchish Limited | Administrative & support | 2019 |
| FEX Property Ventures Ltd | Real estate | 2024 |
| FF Real Estate Ltd | Real estate | 2012 |
| Fforestt Limited | Wholesale & retail | 2019 |
| FG Aila Limited | Extraterritorial | 2022 |
| Fgkplumbing Ltd | Construction | 2025 |
| FGL Enterprises Ltd | Administrative & support | 2008 |
| FHA Building Solutions Ltd | Construction | 2016 |
| Field Forest Ocean Ltd | Professional & scientific | 2019 |
| Field Interiors Limited | Wholesale & retail | 2005 |
| Fifteen Clarendon Rise (Managements) Limited | Households | 1969 |
| Fifteen Ltd | Professional & scientific | 2025 |
| Fifteen Property Services Ltd | Water & waste | 2026 |
| FIG Labs Limited | Information & communication | 2025 |
| Fiitzone Online Limited | Arts & recreation | 2025 |
| Filegold Limited | Households | 1986 |
| Filipinocreativesuk Ltd | Administrative & support | 2026 |
| Financial Freedom Holdings Ltd | Financial services | 2024 |
| Fincert Consulting Ltd | Professional & scientific | 2018 |
| Find My Project Limited | Construction | 2017 |
| Find OUT Ltd | Professional & scientific | 2024 |
| Fine Constructors Ltd | Construction | 2025 |
| Finess Aesthetics Ltd | Wholesale & retail | 2025 |
| Finest Promotion Limited | Wholesale & retail | 2017 |
| Finger on Pulse Ltd | Wholesale & retail | 2017 |
| Finitron Limited | Information & communication | 2025 |
| Finlayson Builders Ltd | Construction | 2022 |
| Finserve Partners Limited | Information & communication | 2017 |
| Finspite Limited | Professional & scientific | 2022 |
| Finspite Real Estate One Limited | Real estate | 2024 |
| Finsuretex Ltd | Information & communication | 2024 |
| Fintaxel Accounting & Advisory LLP | | 2024 |
| Fintech Legal Services Limited | Professional & scientific | 2025 |
| Fiona Marie Design Ltd | Manufacturing | 2022 |
| Fire Electrical & Security Ltd | Construction | 2016 |
| Fireball Property Investments Limited | Real estate | 2013 |
| Fireteam Limited | Information & communication | 2011 |
| Firle Engineering Ltd | Construction | 2008 |
| First AID 4 Staff Limited | Health & social care | 2018 |
| First Comply Ltd | Professional & scientific | 2026 |
| First Impressions Services Limited | Administrative & support | 2019 |
| First Notification Limited | Information & communication | 2013 |
| First Place Consulting Limited | Information & communication | 2013 |
| First Response Pro Limited | Education | 2023 |
| First Rochford (Slough) Management Company Limited | Households | 1980 |
| First Shinners Management Company Limited | Households | 1984 |
| First XI Vision Ltd | Professional & scientific | 2024 |
| Firth Kershaw Consulting Limited | Professional & scientific | 2012 |
| Fishers Wood Grove Limited | Households | 2018 |
| Fit Birds Limited | Arts & recreation | 2020 |
| Fit for Anaesthesia Ltd | Health & social care | 2017 |
| Fitt and TAN Property Limited | Real estate | 2025 |
| Fittexx Ltd | Information & communication | 2026 |
| Five Oaks Mews Residents' Association Ltd | Households | 2008 |
| Five Star Care & Staffing Limited | Administrative & support | 2023 |
| Five Star Security Limited | Administrative & support | 2016 |
| Five Z Investments Ltd | Real estate | 2023 |
| FIX IT Signs Ltd | Manufacturing | 2024 |
| FIX London Fields Limited | Health & social care | 2011 |
| Fixes & Fuses Ltd | Construction | 2019 |
| Fiya and Flava Ltd | Hospitality | 2026 |
| FJH Consulting Ltd | Professional & scientific | 2022 |
| FL TB Consulting Ltd | Information & communication | 2021 |
| Flabens Ltd | Transport & logistics | 2018 |
| Flair Consulting Group Limited | Information & communication | 2023 |
| Flamebreak Limited | Water & waste | 2025 |
| Flashpoint Photos Ltd | Professional & scientific | 2024 |
| Flats 1 - 5, 42 London Lane RTM Company Limited | Households | 2017 |
| Flawless Spray Limited | Construction | 2013 |
| Fledglings Montessori (Bromley) Limited | Education | 2024 |
| Flexford Vineyard Limited | Manufacturing | 2026 |
| Flexible Rentals Limited | Transport & logistics | 2023 |
| Flexygen Limited | Administrative & support | 2016 |
| Flibberty Gibberty Ltd | Health & social care | 2022 |
| Flicks by Whitney Ltd | Professional & scientific | 2025 |
| Flighteagle Limited | Wholesale & retail | 1985 |