| Forgewell Limited | Real estate | 2025 |
| Forging North Ltd | Information & communication | 2025 |
| Forgotten Place Developments Ltd | Construction | 2023 |
| Forgotten Place Ltd | Professional & scientific | 2024 |
| Fork on Purpose Ltd | Hospitality | 2023 |
| Forkest Limited | Professional & scientific | 2018 |
| Forkprint Limited | Information & communication | 2025 |
| Forks N Knives Limited | Wholesale & retail | 2022 |
| Forliving Limited | Real estate | 2017 |
| Form Clinics Ltd | Other services | 2023 |
| Form Consultants Ltd | Professional & scientific | 2026 |
| Form Design Associates Limited | Construction | 2017 |
| Form Development Management Limited | Real estate | 2023 |
| Form Filed Limited | Real estate | 2002 |
| Form Flow Ltd | Wholesale & retail | 2025 |
| Form Furniture Solutions Ltd | Wholesale & retail | 2022 |
| Form Lifestyle Store Ltd | Wholesale & retail | 2024 |
| Form Online Assets Management Limited | Administrative & support | 2005 |
| Form Online Business Services Limited | Financial services | 2012 |
| Form Online Limited | Administrative & support | 2006 |
| Form Property Management Limited | Real estate | 2017 |
| Forma Creative Studios Ltd | Information & communication | 2022 |
| Forma's Technical Services Ltd | Information & communication | 2018 |
| Formasons Group Ltd | Real estate | 2022 |
| FORMAT3A Ltd | Wholesale & retail | 2016 |
| Formation Pilgrims Ltd | Education | 2019 |
| Formby SPV Limited | Construction | 2025 |
| Formcase UK Ltd | Wholesale & retail | 2025 |
| Forme Brows Ltd | Wholesale & retail | 2026 |
| Forme Physiotherapy Limited | Health & social care | 2022 |
| Formerglory Developments Limited | Construction | 2016 |
| Formerglory Management Limited | Households | 2019 |
| Formerly Known AS Limited | Wholesale & retail | 2022 |
| Formico Ltd | Other services | 2024 |
| Formin Engineering and Construction Ltd | Professional & scientific | 2016 |
| Formisimo Ltd | Information & communication | 2014 |
| Formula (MCR) Ltd | Professional & scientific | 2022 |
| Formwork & Structures Engineering Ltd | Construction | 2022 |
| Formwork & Structures Limited | Construction | 2020 |
| Formwork & Structures Plant Hire Ltd | Administrative & support | 2022 |
| Formwork Salford UK Ltd | Construction | 2017 |
| Formwork Services Ltd | Construction | 2018 |
| Forrest North Consulting Ltd | Information & communication | 2022 |
| Forrester Electrical Limited | Energy | 2013 |
| Forshaws Fencing Limited | Construction | 2004 |
| Forshaws Properties Limited | Real estate | 2024 |
| Forster Asbestos Services Limited | Professional & scientific | 2018 |
| Forsyth Brothers Holdings Limited | Financial services | 2024 |
| Forsyth Glasgow LLP | | 2023 |
| Fort Knox Asset & Wealth Management Ltd | Professional & scientific | 2025 |
| Fort Search Ltd | Information & communication | 2022 |
| Fort William Assets Limited | Extraterritorial | 2014 |
| Fort William Leisure Ltd | Hospitality | 2026 |
| Fort William Retail Assets Limited | Real estate | 2015 |
| FORT3 Ltd | Wholesale & retail | 2023 |
| Fortaleza UK Ltd | Health & social care | 2024 |
| Fortay Connect Ltd | Information & communication | 2018 |
| Fortbridge Holdings Ltd | Information & communication | 2026 |
| Forte Bidco Limited | Information & communication | 2017 |
| Forte Residences Ltd | Real estate | 2025 |
| Forte Topco Limited | Information & communication | 2017 |
| Forte Wealth Management Limited | Financial services | 2017 |
| Fortelux Secure Ltd | Administrative & support | 2026 |
| Fortex Gaming Ltd | Wholesale & retail | 2026 |
| Fortexa Nexaro Trading Ltd | Extraterritorial | 2026 |
| Forth Action Invest Ltd | Real estate | 2018 |
| Forthergill Island Health Care Limited | Health & social care | 2014 |
| Forthplus Pensions Limited | Financial services | 2012 |
| Fortia Analytics Limited | Professional & scientific | 2018 |
| Fortify Clinic Limited | Health & social care | 2019 |
| Fortify Security Group Ltd | Administrative & support | 2025 |
| Fortifya Limited | Wholesale & retail | 2025 |
| Fortiori Limited | Professional & scientific | 2020 |
| Fortis Accounts Ltd | Professional & scientific | 2026 |
| Fortis and SOL Limited | Extraterritorial | 2026 |
| Fortis by Fortitude Ltd | Wholesale & retail | 2025 |
| Fortis Corporation Limited | Real estate | 2025 |
| Fortis Head Office Ltd | Professional & scientific | 2018 |
| Fortis Holdco Limited | Financial services | 2022 |
| Fortiswill Solutions Limited | Transport & logistics | 2025 |
| Fortitude Brands Limited | Wholesale & retail | 2023 |
| Fortitude Equip Build and Construction Ltd | Construction | 2025 |
| Fortitude Fitness and Training Limited | Arts & recreation | 2023 |
| Fortix Solutions Ltd | Information & communication | 2025 |
| Fortmap Ltd | Wholesale & retail | 2025 |
| Fortnite Ltd | Professional & scientific | 2019 |
| Fortress Care Limited | Administrative & support | 2016 |
| Fortress Childcare Ltd | Education | 2023 |
| Fortress Developers Ltd | Construction | 2019 |
| Fortress for Investment Limited | Extraterritorial | 2026 |
| Fortress Hill Properties Investment Limited | Real estate | 2020 |
| Fortress Incorporation Limited | Health & social care | 2017 |
| Fortress Security Services Limited | Administrative & support | 2018 |
| Fortuna BIZ Solutions Ltd | Information & communication | 2026 |
| Fortuna Commercial Ltd | Real estate | 2025 |
| Fortuna Services Ltd | Administrative & support | 2020 |
| Fortuna Technologies SS Ltd | Information & communication | 2026 |
| Fortunabayglobal Ltd | Professional & scientific | 2026 |
| Fortune 4U Limited | Wholesale & retail | 2012 |
| Fortune Bricks Ltd | Real estate | 2022 |