| F1 Hoverpod Limited | Other services | 2005 |
| F1 Hoverpod Manufacture Ltd | Manufacturing | 2006 |
| F1 Hoverpod Merchandise Limited | Arts & recreation | 2006 |
| F1 Hoverpod Racing Ltd | Arts & recreation | 2006 |
| F15 Technology Ltd | Information & communication | 2017 |
| F2F Ventures Limited | Wholesale & retail | 2024 |
| F30 Building Products Limited | Wholesale & retail | 2012 |
| FA Market Ltd | Wholesale & retail | 2026 |
| FA Relay Logistics Limited | Transport & logistics | 2026 |
| FA Shaw Limited | Administrative & support | 2008 |
| Faab Store Limited | Wholesale & retail | 2024 |
| Faalkugroup Ltd | Wholesale & retail | 2023 |
| FAB Garden Buildings Limited | Manufacturing | 2022 |
| Fabian Property Management Ltd | Real estate | 2004 |
| Fabiozonaj Limited | Professional & scientific | 2022 |
| Fable Ryzom Limited | Administrative & support | 2026 |
| Fable Technologies Ltd | Information & communication | 2025 |
| Fabri-Mac Mining Limited | | 1986 |
| Fabric Foodtech Ltd | Information & communication | 2024 |
| Fabric Fusion Seating and Upholstery Ltd | Manufacturing | 2025 |
| Fabric Install Limited | Manufacturing | 2015 |
| Fabricated Metals Limited | Manufacturing | 1949 |
| Fabricated Products (UK) Limited | Manufacturing | 2003 |
| Fabrick Interior Design Ltd | Professional & scientific | 2022 |
| Fabrico Marketing Limited | Agriculture & fishing | 2025 |
| Fabs Chicken Ltd | Hospitality | 2021 |
| Fabulous Cleaners Ltd | Administrative & support | 2023 |
| FAC Construction Ltd | Construction | 2022 |
| Face Facts (Buxton) Limited | Other services | 2004 |
| Face Value Performance Psychology Limited | Professional & scientific | 2017 |
| Face&Finish Ltd | Other services | 2025 |
| Facer Thompson Ltd | Professional & scientific | 2025 |
| Facethetics Training Limited | Education | 2015 |
| Facey Family Foundation | Other services | 2011 |
| Facility First Limited | Administrative & support | 2025 |
| Facility Maintenance Solutions Ltd | Construction | 2010 |
| Facility Management Group Ltd | Administrative & support | 2024 |
| Factory Family Group Limited | Other services | 2023 |
| Factory Shisha Lounge Limited | Extraterritorial | 2015 |
| Factory Studios Limited | Information & communication | 1997 |
| Fadfree Nutrition Ltd | Health & social care | 1997 |
| Fadhl Limited | Health & social care | 2016 |
| Fagans Friends Ltd | Hospitality | 2023 |
| Fahd Construct IT Ltd | Construction | 2025 |
| Faie Deals Limited | Wholesale & retail | 2025 |
| Failsafe Heating Limited | Other services | 1999 |
| Fair and Real Limited | Education | 2023 |
| Fair Collective Group Limited | Professional & scientific | 2023 |
| Fair Leisure Ltd | Arts & recreation | 2023 |
| Fair Property Management Ltd | Real estate | 2023 |
| Fairbank Group Holdings Limited | Real estate | 2019 |
| Fairbourne Properties Limited | Real estate | 2011 |
| Fairbridge Estates Ltd | Real estate | 2025 |
| Fairbridge Mount Ltd | Real estate | 2025 |
| Fairburn Mews Health Care Limited | Health & social care | 2001 |
| Fairburn Vale Health Care Limited | Health & social care | 2004 |
| Fairday Research Limited | Information & communication | 2009 |
| Faire Bros.& Co. Limited | Manufacturing | 2008 |
| Fairfield Business Park Limited | Real estate | 2021 |
| Fairfield Moorgate Ltd | Real estate | 2019 |
| Fairhurst Architects Ltd. | Professional & scientific | 2024 |
| Fairhurst Mechanical and Electrical Contracting Engineers Limited | Construction | 2010 |
| Fairhurst Stone Merchants Limited | Manufacturing | 2012 |
| Fairies 4 YOU Ltd | Hospitality | 2021 |
| Fairleigh Development Company Limited | Administrative & support | 1999 |
| Fairmont Cavendish Ltd | Real estate | 2022 |
| Fairmount Nursery Limited | Education | 1997 |
| Fairpoint Developments Ltd | Construction | 2025 |
| Fairport Construction Equipment Ltd | Manufacturing | 2022 |
| Fairshares Association Ltd | Professional & scientific | 2015 |
| Fairway View Management Company Limited | Households | 2002 |
| Fairways & Greens Golf Lounge Ltd | Arts & recreation | 2023 |
| Fairwinds Health Care Limited | Health & social care | 2002 |
| Fairy Nails & Beauty (SH) Limited | Other services | 2019 |
| Fairy Sail LLP | | 2015 |
| Fairy Tale Wedding Cars Ltd | Transport & logistics | 2014 |
| Faisel Hussain Ltd | Transport & logistics | 2026 |
| Faith Health Care Services Limited | Administrative & support | 2012 |
| Faith Jacob Holdings Limited | Financial services | 2025 |
| Faith Legal Services Ltd | Other services | 2020 |
| Faith Temple the Inn of God(Apostolic) Ltd | Administrative & support | 2012 |
| Faithpath Travel and Travel Tours Limited | Administrative & support | 2025 |
| Faithstar LLP | | 2013 |
| FAIZI9 Limited | Real estate | 2021 |
| Falafel FIX Limited | Hospitality | 2024 |
| Falafel Servics Limited | Hospitality | 2012 |
| Falafel Station Original Limited | Hospitality | 2023 |
| Falcon Blinds Limited | Wholesale & retail | 2022 |
| Falcon Clerical Ltd | Administrative & support | 2024 |
| Falcon Commercial Services Ltd | Wholesale & retail | 2005 |
| Falcon Multi Services Limited | Professional & scientific | 2013 |
| Falcon Turbo Developments Ltd | Manufacturing | 2016 |
| FALCON2024 Ltd | Wholesale & retail | 2024 |
| Falconer - Cupitt Investments Ltd | Real estate | 2021 |
| Falconer Homes Ltd | Real estate | 2024 |
| Falkon Residence Ltd | Households | 2026 |
| Fall Protection Solutions Limited | Administrative & support | 2006 |
| Fallon & Sayers (Holdings) Limited | Financial services | 2012 |
| Fallon & Sayers Limited | Financial services | 1996 |
| Fallow Architectural Design Limited | Professional & scientific | 2023 |