| FOREVER31 Ltd | Wholesale & retail | 2026 |
| Forfar Property Ltd | Real estate | 2017 |
| Forfit Ltd | Professional & scientific | 2025 |
| Forge EDM Group Ltd | Financial services | 2025 |
| Forge Lane Property Holdings Limited | Financial services | 2017 |
| Forge North Developments Ltd | Real estate | 2024 |
| Forge Planning Ltd | Professional & scientific | 2026 |
| Forgeborn Ltd | Manufacturing | 2025 |
| Forged Forest Timbers Ltd | Manufacturing | 2024 |
| Forging Assets Ltd | Real estate | 2017 |
| Forgingbricks Ltd | Wholesale & retail | 2023 |
| Forgotten Lines Limited | Information & communication | 2012 |
| Forlove Health Limited | Health & social care | 2013 |
| Form Bespoke Jewellers Limited | Manufacturing | 2004 |
| Forma Fitouts Ltd | Construction | 2025 |
| Formation 3D Ltd | Professional & scientific | 1990 |
| Formation Consultancy Limited | Administrative & support | 2022 |
| Formcon Contractors Ltd | Construction | 2014 |
| Formercue Limited | Arts & recreation | 2016 |
| Formersquare Limited | Administrative & support | 2017 |
| Formidable Medical Services Limited | Health & social care | 2011 |
| Forms IT Ltd | Information & communication | 2018 |
| Formula Print (Leeds) Ltd | Manufacturing | 2013 |
| Formula Print Holdings Limited | Financial services | 2026 |
| Formula Print Ltd | Manufacturing | 2001 |
| Forrest Joinery and Construction Contracts Limited | Construction | 2003 |
| Forsta Projects Ltd | Professional & scientific | 2020 |
| Forsta Studio Ltd | Professional & scientific | 2025 |
| Forster Mews Management Company Limited | Households | 2007 |
| Forster Place (Bradford) Limited | Real estate | 2012 |
| Forster Place Apartments Ltd | Real estate | 2015 |
| Fort.Solutions Ltd | Information & communication | 2015 |
| Fortanix IP Holding Limited | Administrative & support | 2025 |
| Forte Stone Construction Ltd | Construction | 2026 |
| Fortentra Ltd | Information & communication | 2026 |
| Fortexo FM Ltd | Administrative & support | 2021 |
| Forth Electrical Limited | Construction | 2002 |
| Forth Health Holdings Limited | Construction | 2006 |
| Forth Health Limited | Construction | 2006 |
| Fortify Healthcare Services Ltd | Administrative & support | 2022 |
| Fortify Stock Ltd | Real estate | 2025 |
| Fortis Developments (Leeds) Limited | Construction | 2025 |
| Fortis Foods Limited | Manufacturing | 2015 |
| Fortis VGL Group Limited | Financial services | 2025 |
| Fortitude Training Collective Ltd | Arts & recreation | 2026 |
| Fortitude Training Limited | Education | 2019 |
| Fortiva Logistics Ltd | Transport & logistics | 2025 |
| Fortrea Clinical Research Unit Limited | Professional & scientific | 1991 |
| Fortrea Development Limited | Professional & scientific | 1986 |
| Fortrea UK Holdings Limited | Professional & scientific | 1991 |
| Fortress Windows and Doors Ltd | Construction | 2022 |
| Fortuna Claims Limited | Other services | 2024 |
| Fortuna Football Training Ltd | Education | 2025 |
| Fortuna Systems Ltd | Information & communication | 2014 |
| Fortunadrive Ltd | Transport & logistics | 2024 |
| Fortune Developments Ltd | Real estate | 2018 |
| Fortune Infra Ltd | Real estate | 2023 |
| Forty Eight Consulting Limited | Professional & scientific | 2021 |
| Forty First Creative Ltd | Professional & scientific | 2025 |
| FORTY4THREE Limited | Information & communication | 2015 |
| Forwade Site Services Ltd | Construction | 2022 |
| Forward Directors Ltd | Professional & scientific | 2007 |
| Forward Facilities Management Limited | Administrative & support | 2016 |
| Forward Investment Group LLP | | 2015 |
| Forward Investment LLP | | 2006 |
| Forward Investment Pannal LLP | | 2015 |
| Forward Investment Properties Harrogate LLP | | 2022 |
| Forward Ladies Limited | Other services | 2005 |
| Forward Music Limited | Arts & recreation | 2014 |
| Forward Recycling (Yorkshire) Ltd | Construction | 2007 |
| Forward Security Services Ltd | Other services | 2022 |
| Forward Technologies Ltd | Information & communication | 2023 |
| Forward Thinking EHS Limited | Hospitality | 2023 |
| Forward-Minds Research Consulting Ltd | Professional & scientific | 2018 |
| Forwells Investments Ltd | Real estate | 2021 |
| Forza AW Limited | Manufacturing | 2006 |
| Forza Foods Limited | Manufacturing | 2010 |
| Foss ROW Management Company (York) Limited | Households | 2001 |
| Fosse SIL WY Ltd | Construction | 2020 |
| Fossgate Developments Ltd | Construction | 2013 |
| Fossi Trading Ltd | Wholesale & retail | 2026 |
| Fosso Healthcare Ltd | Health & social care | 2017 |
| Fossview House (York) RTM Company Limited | Households | 2014 |
| Foster Engineering Services Ltd | Manufacturing | 2020 |
| Foster Financial Consulting Ltd | Professional & scientific | 2024 |
| Foster IT Consultants Ltd | Professional & scientific | 2014 |
| Foster Macrow Limited | Professional & scientific | 2007 |
| Foster Plant Hire & Excavations Contractors Ltd | Construction | 2026 |
| Foster Properties (Leeds) Limited | Real estate | 2003 |
| Fostert Limited | Wholesale & retail | 2025 |
| Fotsing Courier Services Ltd | Transport & logistics | 2023 |
| Fotsing Multi Service Ltd | Health & social care | 2023 |
| Foulds Cleaning Solutions Limited | Administrative & support | 2022 |
| Foulridge Investments | Financial services | 2019 |
| Found & Flow Ltd | Wholesale & retail | 2025 |
| Found Barbers Ltd | Other services | 2024 |
| Found Recruitment Group Ltd | Administrative & support | 2013 |
| Foundation for Credit Counselling | Financial services | 1992 |
| Foundation for the Sociology of Health and Illness | Administrative & support | 1999 |
| Foundation Mental Health Limited | Education | 2024 |