| FDS Director Services Limited | Professional & scientific | 2014 |
| FDS Employee Ownership Trust Limited | Professional & scientific | 2020 |
| FE Professional Services Ltd | Education | 2023 |
| Feathers & Tails Ltd | Wholesale & retail | 2021 |
| Federation of Disability Sports Organisations Limited | Arts & recreation | 2011 |
| Feig Limited | Administrative & support | 2012 |
| Felicity Living Ltd | Manufacturing | 2025 |
| Femhall 4X4 Vehicle Hire Ltd | Administrative & support | 2025 |
| Fenestration Central Ltd | Other services | 2014 |
| Fenner Verwaltung Limited | Professional & scientific | 2010 |
| Fenton Finance Limited | Financial services | 2006 |
| Fentrose Limited | Real estate | 2022 |
| Feroz Holdings Limited | Hospitality | 2024 |
| Ferry 1967 Limited | Extraterritorial | 2013 |
| Fettle Home Ltd | Manufacturing | 2025 |
| FF Health Ltd | Health & social care | 2019 |
| FGB Minerals Limited | Mining & quarrying | 2008 |
| FHC Consulting Limited | Administrative & support | 2006 |
| Fhsa Ltd | Real estate | 2024 |
| Fibre Cat Solutions Ltd | Information & communication | 2024 |
| Fibre Construction Ltd | Construction | 2024 |
| Fibrenet Holding | Construction | 2016 |
| Fielding & Platt International Limited | Extraterritorial | 2004 |
| FIF Ltd | Education | 2019 |
| Fifi Kind Care Ltd | Extraterritorial | 2019 |
| Filey Parade Limited | Hospitality | 2022 |
| Filotumi Ltd | Real estate | 2019 |
| Finances Sorted Limited | Financial services | 2002 |
| Financetech Limited | Real estate | 1998 |
| Financetech Property Holdings Limited | Construction | 2016 |
| Financial Services Marketing Limited | | 1988 |
| Find IT Sell IT LET IT Limited | Extraterritorial | 2008 |
| Findsy Ltd | Wholesale & retail | 2025 |
| Fine ASH Limited | Administrative & support | 2012 |
| Fine Finds Ltd | Wholesale & retail | 2023 |
| Finedoor (UK) LLP | | 2012 |
| Finesse P&I Ltd | Construction | 2025 |
| Finfrey Limited | Financial services | 2024 |
| Finley B Limited | Real estate | 2024 |
| Fino Pizza Ltd | Hospitality | 2024 |
| Fino Pizzeria & Cicchetti Ltd | Hospitality | 2019 |
| Finsterer Limited | Construction | 2012 |
| Firdous Group Limited | Wholesale & retail | 2021 |
| Firdous Healthcare Ltd | Health & social care | 2016 |
| Fire & Slice Ltd | Hospitality | 2024 |
| Fire and Ice Spa Ltd | Other services | 2025 |
| Firebird Aesthetics Ltd | Other services | 2025 |
| Firmaplus(+) Ltd. | Information & communication | 2007 |
| Firmport Limited | Professional & scientific | 1996 |
| First 4 Properties (Yorkshire) Limited | Real estate | 2002 |
| First Avenue (Newton Hill) Management Limited | Real estate | 2012 |
| First Chemical and Cleaning Supplies Ltd | Administrative & support | 2025 |
| First Choice Advantage LLP | | 2012 |
| First Choice Electrical Ltd | Construction | 2019 |
| First Choice Landscapes Limited | Agriculture & fishing | 2002 |
| First Class Cricket Coaching Limited | Arts & recreation | 2011 |
| First Class Windows (Yorkshire) Limited | Construction | 2004 |
| First Excellence Housing and Estate Managment Ltd | Real estate | 2022 |
| First Inline Design Limited | Administrative & support | 2007 |
| First Inline Products Limited | Manufacturing | 2020 |
| First Resource Group AG | Professional & scientific | 2020 |
| First Response Security Yorkshire Ltd | Construction | 2019 |
| FIRST4MEDIA Ltd | Information & communication | 2026 |
| Firstslot Residents Management Limited | Extraterritorial | 1987 |
| Fisher Hall Limited | Real estate | 2006 |
| Fisili Limited | Extraterritorial | 2008 |
| Fitbeam Limited | Wholesale & retail | 2024 |
| Fitfix Rehab Ltd | Health & social care | 2023 |
| Fitness World 24 Limited | Administrative & support | 2006 |
| Fitzgerald RC Structures and Groundworks Ltd | Construction | 2020 |
| Five Hearts Holdings Ltd | Real estate | 2025 |
| FIX and Connect Ltd | Wholesale & retail | 2025 |
| FK Events Ltd | Arts & recreation | 2026 |
| Flagtails Ltd | Wholesale & retail | 2025 |
| Flair and Square Limited | Construction | 2016 |
| Flair Care Solutions Limited | Health & social care | 2022 |
| Flames Fireplace & Heating Centre (Wakefield) Ltd. | Wholesale & retail | 1999 |
| Flanshaw Garage Limited | Wholesale & retail | 2017 |
| Flaru Management Ltd. | Professional & scientific | 2011 |
| Flash Fleet Couriers Ltd | Transport & logistics | 2025 |
| Flashgb Ltd | Wholesale & retail | 2023 |
| Flavoursome Limited | Manufacturing | 2022 |
| Flawless Global Logistics Ltd | Transport & logistics | 2024 |
| Fleet Comms Holdings Limited | Financial services | 2023 |
| Fleet Comms Limited | Administrative & support | 2008 |
| Fleet Transport Consultants Ltd | Professional & scientific | 2023 |
| Fleet Valet UK Limited | Administrative & support | 2023 |
| Fleetshine Limited | Wholesale & retail | 2015 |
| Fleming Ecology Limited | Professional & scientific | 2015 |
| Fletcher-Smillie Investments | Financial services | 2021 |
| Flex Commercials Limited | Other services | 2007 |
| Flex Properties Limited | Real estate | 2014 |
| Flex-Telecom Limited | Information & communication | 2009 |
| Flexi Time Planner Limited | Information & communication | 2018 |
| Flexicore Tech Solutions Ltd | Information & communication | 2025 |
| Flight Avionics Limited | Manufacturing | 1987 |
| Flink & Sauber Gebaeudeservice Limited | Administrative & support | 2015 |
| Flip-Flop Bernard Limited | Administrative & support | 2007 |
| Flok 74 Ltd | Professional & scientific | 2021 |
| Floor Guru Ltd | Information & communication | 2026 |