| Forest Finance Ltd | Professional & scientific | 2022 |
| Forest Grange (Horsham) Management Company Limited | Households | 1994 |
| Foretia Limited | Health & social care | 2020 |
| Forever Forever Limited | Wholesale & retail | 2013 |
| Forever in Bloom Ltd | Wholesale & retail | 2023 |
| Forge Homes Residential Sales and Lettings Ltd | Real estate | 2014 |
| Fortilitas Ltd | Wholesale & retail | 2026 |
| Fortion Healthcare Limited | Health & social care | 2022 |
| Fortknox Ltd | Administrative & support | 2025 |
| Fortune Edge Limited | Wholesale & retail | 2021 |
| Fortysbar Limited | Professional & scientific | 2022 |
| Fossilised Limited | Wholesale & retail | 2026 |
| Foster Furniture Limited | Wholesale & retail | 2025 |
| Foundation Housing Limited | Real estate | 2021 |
| Fountain Court Properties Ltd | Real estate | 2021 |
| Four Pillars Realty Ltd | Real estate | 2025 |
| Four T Property Ltd | Administrative & support | 2020 |
| Fourqs Consultants Ltd | Professional & scientific | 2019 |
| Fourseasons Health Ltd | Health & social care | 2024 |
| Foxglove Hollow NO. 1 Limited | Households | 2000 |
| Foxglove Management Company Limited | Real estate | 2023 |
| Foxhall Village Management Company Limited | Households | 2013 |
| Foxley Manor Management Company Limited | Households | 1999 |
| FR 1 Management Limited | Real estate | 2025 |
| Fradsco Ltd | Real estate | 2024 |
| Framfield Court, Bush Hill Park (Management) Limited | Households | 1971 |
| Frank Danechz Ltd | Administrative & support | 2017 |
| Frank G. Gates Limited | Wholesale & retail | 1930 |
| Franklyn Osian Limited | Health & social care | 2026 |
| Franks London Limited | Wholesale & retail | 2019 |
| Frankson Insights Limited | Health & social care | 2025 |
| Fraser Beecham Limited | Professional & scientific | 2014 |
| Fraser Steele Design Ltd | Professional & scientific | 2021 |
| Frasers Property Freehold Ltd | Real estate | 2025 |
| Frasers Property Group Ltd | Real estate | 2023 |
| Fraudway Productions Ltd | Arts & recreation | 2025 |
| Fred Newton Newti Ltd | Wholesale & retail | 2020 |
| Freddie Property Limited | Real estate | 2022 |
| Free Seed Films Ltd | Professional & scientific | 2012 |
| Freee Impact Initiative CIC | Professional & scientific | 2026 |
| Freee Recycle Holding Limited | Water & waste | 2021 |
| Freelandsales Ltd | Wholesale & retail | 2017 |
| Frella Solutions Ltd | Professional & scientific | 2024 |
| French & Quarter Ltd | Hospitality | 2023 |
| French Apartments (Freehold) Ltd | Households | 2008 |
| French Coast and Valleys Limited | Professional & scientific | 2015 |
| Frequencysound Limited | Administrative & support | 2014 |
| Fresh Landscapes and Driveways Ltd | Administrative & support | 2019 |
| Fresh Property Contracts -South East Limited | Construction | 2016 |
| Fresh Scaffolding Ltd | Construction | 2026 |
| Fresher Wells Ltd | Information & communication | 2014 |
| Freshly Picked Ltd | Wholesale & retail | 2020 |
| Freshwater Consultants Ltd | Professional & scientific | 2025 |
| Frida London Ltd | Hospitality | 2024 |
| Friendz Corner Limited | Hospitality | 2022 |
| Frog Studio Limited | Professional & scientific | 2024 |
| Frontier AI Partners Ltd | Information & communication | 2026 |
| Frontier Global Partners LLP | | 2014 |
| Frontier Healthcare Holdings Ltd | Real estate | 2024 |
| Frontier Rehab Limited | Information & communication | 2010 |
| Fruitful Vines Limited | Health & social care | 2025 |
| FRV Technologies Limited | Information & communication | 2023 |
| FRY Properties Limited | Households | 2024 |
| FS8 Blackhorse Lane Ltd | Arts & recreation | 2024 |
| Fsandru Engineering Services Limited | Professional & scientific | 2015 |
| FSE Autos & Tyres Ltd | Wholesale & retail | 2017 |
| FSI Healthcare Ltd | Health & social care | 2023 |
| FTB GAS and Heating Ltd | Construction | 2026 |
| Ftmo Limited | Real estate | 2023 |
| FTO Locums Services Ltd | Health & social care | 2019 |
| Ftransport Limited | Transport & logistics | 2015 |
| FTX Management Consult Limited | Professional & scientific | 2016 |
| FTZ Investment Limited | Other services | 2019 |
| Fucix Ltd | Wholesale & retail | 2022 |
| Fuhb Ltd | Hospitality | 2025 |
| Fulcrum Environmental Services Ltd | Construction | 2015 |
| Fulcrum Healthcare Services Ltd | Administrative & support | 2022 |
| Fulfilment Care Services Ltd | Health & social care | 2021 |
| Fulldrive Investments Limited | Professional & scientific | 2002 |
| Fuller Software Ltd | Information & communication | 2020 |
| Fully Paid Business Limited | Manufacturing | 2017 |
| Funk Investment Group Limited | Real estate | 2024 |
| Funk Motorsport Limited | Administrative & support | 2017 |
| Funky Magpie Ltd | Wholesale & retail | 2024 |
| Funky Phones Limited | Administrative & support | 2004 |
| Funmash Limited | Administrative & support | 2025 |
| Furculita's Ltd | Construction | 2022 |
| Furl Close Management Limited | Households | 2024 |
| Furlong Group Limited | Construction | 2018 |
| Furnfield Limited | Manufacturing | 2016 |
| Furnished Quarters UK Ltd | Construction | 2024 |
| Furniture Hire London Limited | Wholesale & retail | 2018 |
| Furteen Limited | Construction | 2013 |
| Fusion (Frome) Management Company Limited | Households | 2006 |
| Futa Limited | Arts & recreation | 2023 |
| Fution Tech Ltd | Wholesale & retail | 2026 |
| Future Focus Education Consultancy Ltd | Education | 2026 |
| Future Leaders Foundation CIC | Other services | 2024 |
| Future Scaffolding Limited | Construction | 2017 |
| Fwali Limited | Professional & scientific | 2011 |