| Ezypay Technologies Limited | Professional & scientific | 2013 |
| F D Farming LLP | | 2021 |
| F Rich Consulting Ltd | Professional & scientific | 2025 |
| F. Barber Properties Limited | Hospitality | 1963 |
| F.I.L.M. Systems Limited | Information & communication | 2024 |
| Fabtechai Salesforce Solutions Ltd | Information & communication | 2024 |
| Fagerlund Media Limited | Professional & scientific | 2021 |
| Fair Digital UK Limited | Information & communication | 2012 |
| Faircloth Construction Limited | Construction | 2006 |
| Faircloth Havant Limited | Real estate | 2018 |
| Faircloth Holdings Limited | Financial services | 2018 |
| Fairdene Lodge Care Home Limited | Health & social care | 2010 |
| Fairfax Violins Limited | Manufacturing | 2014 |
| Fairhills Property Engineering and Management Limited | Construction | 2015 |
| Fairlawn House Management (Tunbridge Wells) Limited | Households | 2000 |
| Fairward Data Ltd | Information & communication | 2025 |
| Fairypan Ltd | Manufacturing | 2015 |
| Familatas Consulting Limited | Real estate | 2010 |
| Famorenovo Limited | Information & communication | 2026 |
| Famous BGA Ltd | Professional & scientific | 2021 |
| FAN Parks London Ltd | Arts & recreation | 2025 |
| Fanclub App Ltd | Information & communication | 2020 |
| FAR Shore Consulting Limited | Professional & scientific | 2015 |
| Fargs Limited | Other services | 2005 |
| Fargs Tonbridge Limited | Other services | 2015 |
| Farm and General Insurance Consultants Limited | Financial services | 2004 |
| Farm Field Place Management Company Limited | Households | 2025 |
| Farmcombe Financial Limited | Financial services | 2019 |
| Farooki & Farooki Ltd | Professional & scientific | 2024 |
| Farrell and Co Enterprises LLP | | 2018 |
| Farringdon House (East Grinstead) Management Company Limited | Households | 2019 |
| Farthings Properties LLP | | 2007 |
| FASE6 Marketing Ltd | Manufacturing | 2020 |
| Fashion Carpets Limited | Wholesale & retail | 2011 |
| Fashion Investment Property Limited | Construction | 1992 |
| Fashion Steps Limited | Wholesale & retail | 2016 |
| Fastfoodtogo Limited | Hospitality | 2025 |
| Fastrack Information Systems Limited | Manufacturing | 1997 |
| FAT Tail Ltd | Information & communication | 2025 |
| Father's Embrace Ministries | Other services | 2010 |
| FBL Property Ltd | Real estate | 1998 |
| FC Contracts Ltd | Professional & scientific | 2020 |
| FC Direct Ltd | Construction | 2016 |
| FD Property Developments Limited | Real estate | 2020 |
| Feel Best Ltd | Real estate | 2022 |
| Felton Palatine Limited | Real estate | 2000 |
| Feneli Ltd | Information & communication | 2015 |
| Fenelpi Partners Ltd | Professional & scientific | 2017 |
| Ferguson Financial Holdings Limited | Information & communication | 2015 |
| Fernclyffe Investment Capital Limited | Real estate | 2022 |
| Ferndale (TW) Management Limited | Households | 2001 |
| Ferndale Close RTM Company Limited | Households | 2011 |
| Fernside Management Company Limited | Households | 1986 |
| Ferri Corp Limited | Professional & scientific | 2024 |
| Ferringham Limited | Real estate | 2015 |
| Fetches Limited | Information & communication | 2025 |
| FF Awards Limited | Administrative & support | 2021 |
| FF News Limited | Information & communication | 2022 |
| FFL (Edenbridge) Limited | Construction | 2026 |
| FG Consult Ltd | Financial services | 2012 |
| Fibre Optics Centre Limited | Extraterritorial | 1997 |
| Fidgets Ltd | Education | 2005 |
| Field Food and Country Ltd | Information & communication | 2024 |
| Field Reactors Ltd | Professional & scientific | 2022 |
| Fields of Bloom Limited | Wholesale & retail | 2026 |
| Fieldside Studio Ltd | Information & communication | 2022 |
| Figs on Toast Limited | Wholesale & retail | 2025 |
| Figures Consultancy Ltd | Professional & scientific | 2013 |
| Filling Pieces UK Limited | Wholesale & retail | 2020 |
| Fillo Ltd | Hospitality | 2023 |
| Filmfountaine Limited | Information & communication | 2021 |
| Financial Dimensions Limited | Real estate | 1989 |
| Financial Mechanics Limited | Professional & scientific | 2020 |
| Financial Vision Limited | Professional & scientific | 2016 |
| Fincham Consulting Ltd | Professional & scientific | 2022 |
| Finchcocks Charity Limited(The) | Education | 1984 |
| Finchwood Properties Limited | Real estate | 2011 |
| Fine Design Kitchens (UK) Ltd | Wholesale & retail | 2012 |
| Fine Furniture London Limited | Manufacturing | 2018 |
| Finitor Midco Limited | Financial services | 2021 |
| Finitor Nominees Ltd | Financial services | 2024 |
| Finitor Wealth Group Limited | Financial services | 2021 |
| Finitor Wealth Ltd | Financial services | 2018 |
| Finlock Services Limited | Construction | 2011 |
| Finoaks Actuarial Limited | Financial services | 2026 |
| Finshel Property Investments Ltd | Real estate | 2021 |
| Fintechx Ltd | Information & communication | 2023 |
| Fiona Sheward Ltd | Extraterritorial | 2010 |
| Fiori Flowers Limited | Transport & logistics | 2008 |
| Fire Risk Tracker Ltd | Information & communication | 2023 |
| Firebird Forge Limited | Manufacturing | 2025 |
| Firebird Training Limited | Administrative & support | 2007 |
| Firehaven Safety Ltd | Public administration | 2025 |
| Firestone Recruitment Ltd | Administrative & support | 2026 |
| Firestop Facilities Services Ltd | Construction | 2023 |
| First Choice House Management Ltd | Households | 2015 |
| First Stapleton Management Company Limited | Households | 1983 |
| First Step Finance Recruitment Ltd | Administrative & support | 2026 |
| Firstcom Limited | Information & communication | 1998 |
| Firstplot Limited | Households | 1998 |