| Flow N Value Limited | Information & communication | 2018 |
| Flow Support Services Limited | Real estate | 2020 |
| Flower Pet Ltd | Wholesale & retail | 2021 |
| Flowers 2000 Private Company Limited | Administrative & support | 2002 |
| Flowlabs Ltd | Information & communication | 2018 |
| Flowstox Ltd | Information & communication | 2024 |
| Floxy Limited | Information & communication | 2023 |
| Flozi Solutions Ltd | Wholesale & retail | 2025 |
| FLR 1 Ltd | Hospitality | 2023 |
| Fluffy Faces Ltd | Wholesale & retail | 2023 |
| Fluffz Beauty Ltd | Other services | 2023 |
| Fluor Services Ltd | Professional & scientific | 2017 |
| Fluoroquinolone Toxicity and Research | Health & social care | 2022 |
| Flute and Harris Online Ltd | Wholesale & retail | 2019 |
| Flux Consultancy Ltd | Professional & scientific | 2025 |
| FLY Simple Ltd | Administrative & support | 2025 |
| FLY Travels Limited | Administrative & support | 2024 |
| Flyaround Ltd | Transport & logistics | 2025 |
| Flying Habibi Ltd | Wholesale & retail | 2026 |
| Flying Piggies Limited | Information & communication | 2025 |
| Flyover WXG Limited | Hospitality | 2013 |
| Flyray Tours Ltd | Transport & logistics | 2023 |
| FM Advisory Services Ltd | Professional & scientific | 2020 |
| FM Beauty Limited | Administrative & support | 2025 |
| FM DRY Cleaners Limited | Other services | 2012 |
| FM Star Service Ltd | Wholesale & retail | 2021 |
| FMJ Services Ltd | Transport & logistics | 2024 |
| FMK International Group UK Ltd | Wholesale & retail | 2024 |
| FN Links Limited | Professional & scientific | 2010 |
| Fnas UK Holdings Limited | Real estate | 2022 |
| FNF Solutions INT Ltd | Wholesale & retail | 2025 |
| Fobs and Locks Ltd | Administrative & support | 2021 |
| Focaccia Camden Ltd | Hospitality | 2026 |
| Focus General Solutions Ltd | Administrative & support | 2026 |
| Focus Support Care Services Ltd | Health & social care | 2025 |
| Focus Training Centre Ltd | Education | 2013 |
| Focuspoint Limited | Real estate | 1994 |
| Focussed Care Solutions and Consultancy Ltd | Public administration | 2018 |
| Foil Ecology Research and Development Ltd | Professional & scientific | 2025 |
| Foil Training Group Ltd | Information & communication | 2020 |
| Foinix UK Ltd | Professional & scientific | 2024 |
| Foley Hospitality Ltd | Hospitality | 2024 |
| Folland Court Limited | Households | 1983 |
| Folly Court (Barkham Road) Management Company Limited | Households | 2015 |
| Fomdore Services Ltd | Health & social care | 2020 |
| Fone Base Limited | Wholesale & retail | 2003 |
| FONES4ALL Ltd | Wholesale & retail | 2021 |
| Fonsekaplus Ltd | Education | 2016 |
| Food & Wine 2025 Ltd | Hospitality | 2025 |
| Food City Supermarket Ltd | Wholesale & retail | 2024 |
| Food for Love Ltd | Hospitality | 2013 |
| Food Habit Ltd | Information & communication | 2021 |
| Food Starts Ltd | Hospitality | 2018 |
| Food Wise Stores UK Ltd | Wholesale & retail | 2014 |
| Foodace Limited | Wholesale & retail | 2021 |
| Foodies N' Spices Ltd | Hospitality | 2019 |
| Foodmak Ltd | Hospitality | 2026 |
| Foodsco Ltd | Wholesale & retail | 2024 |
| Foodstuffs M UK Ltd | Wholesale & retail | 2018 |
| Football Connect Ltd | Arts & recreation | 2022 |
| FOR a Big Life Company Ltd | Wholesale & retail | 2024 |
| FOR Vanity's Sake Ltd | Health & social care | 2024 |
| Force 5 Limited | Wholesale & retail | 2023 |
| Force Design London Limited | Construction | 2023 |
| Ford Catering Ltd | Hospitality | 2026 |
| Fordhouses Properties Ltd | Real estate | 2021 |
| Forest Apartments Bristol Management Limited | Households | 2025 |
| Forest Gate Residents Association Limited | Households | 2002 |
| Forest ROW Properties Ltd | Real estate | 2016 |
| Forever Florescence Limited | Professional & scientific | 2014 |
| Forge 1860 Limited | Manufacturing | 2008 |
| Forge Gable Limited | Construction | 2024 |
| Forge Gate Limited | Information & communication | 2026 |
| Forge Litho Services Limited | Manufacturing | 2002 |
| Forge YR Limited | Education | 2024 |
| Fork Fest Ltd | Hospitality | 2025 |
| Forklift Enterprises Limited | Wholesale & retail | 2008 |
| Forklift Training Solutions Limited | Wholesale & retail | 2019 |
| Formark Scaffolding GB Ltd | Professional & scientific | 2011 |
| Formation Homes Ltd | Real estate | 2023 |
| Former RQ UK Limited | Information & communication | 2019 |
| Formly Ltd | Information & communication | 2020 |
| Formula Drone Ltd | Arts & recreation | 2017 |
| Forrunner Ltd | Wholesale & retail | 2025 |
| Forster a Limited | Professional & scientific | 2020 |
| Fort Manor Developments Limited | Construction | 2018 |
| Fort Simpson Ltd | Wholesale & retail | 2020 |
| Fortenovo London Ltd | Hospitality | 2019 |
| Forth Street Limited | Information & communication | 2016 |
| Fortidata Solutions Ltd | Information & communication | 2025 |
| Fortis Nurture Life Ltd | Health & social care | 2025 |
| Fortnum and Moore Limited | Health & social care | 2017 |
| Fortnum London Property Limited | Real estate | 2018 |
| Fortuna Cleaning Services Ltd | Construction | 2013 |
| Fortuna Communications Limited | Information & communication | 1994 |
| Fortune Flavour Ltd | Wholesale & retail | 2025 |
| Fortune Stars Sports Ltd | Other services | 2025 |
| Fortunexis Capital Management LLP | | 2021 |
| Forum (Bury ST Edmunds) Management Company Limited | Households | 2006 |
| Forum Estates Ltd | Real estate | 2026 |