| Forge Sheffield Ltd | Professional & scientific | 2017 |
| Forge Specialist Rehabilitation Limited | Health & social care | 2019 |
| Forge Steel Fabrications Ltd | Manufacturing | 2025 |
| Forge Strategic Ltd | Information & communication | 2026 |
| Forge UK Ltd | Manufacturing | 2006 |
| Forge Valley Heating Ltd | Construction | 2022 |
| Forged Equipment Ltd | Wholesale & retail | 2024 |
| Forged in Wonder Limited | Education | 2026 |
| Forged Performance Limited | Professional & scientific | 2025 |
| Forgemasters Racing Ltd | Transport & logistics | 2022 |
| Forgepoint Consulting Ltd | Professional & scientific | 2026 |
| Forgetmenot Hair & Beauty Studio Ltd | Other services | 2026 |
| Forgis Ltd | Professional & scientific | 2026 |
| Foris Solutions Ltd | Wholesale & retail | 2002 |
| Forishkar Ltd | Administrative & support | 2025 |
| Fork Inc Ltd | Real estate | 2024 |
| Form & Fields Ltd | Wholesale & retail | 2021 |
| Form BIO Ltd | Wholesale & retail | 2026 |
| Form Data Solutions Ltd | Information & communication | 2020 |
| Form Pilates Studio Ltd | Arts & recreation | 2024 |
| Forman Performance Limited | Professional & scientific | 2007 |
| Forman Sushi Limited | Hospitality | 2021 |
| Formerton Limited | Extraterritorial | 1975 |
| Formerton Sheet Sales Limited | Extraterritorial | 1983 |
| Formkraft Limited | Wholesale & retail | 1992 |
| Formm Ltd | Construction | 2010 |
| Formotive Ltd | Information & communication | 2018 |
| Formula Hair Innovation Ltd | Other services | 2012 |
| FORMULA10 Ltd | Health & social care | 2025 |
| Forrest and FUR Ltd | Wholesale & retail | 2025 |
| Forrest Mills Ltd | Hospitality | 2025 |
| Forster Eyecare Limited | Wholesale & retail | 2016 |
| Fort Noks Ltd | Construction | 2015 |
| Forta Fitness Ltd | Arts & recreation | 2021 |
| Fortay Media Limited | Professional & scientific | 2022 |
| Fortex Guard Ltd | Administrative & support | 2026 |
| Fortexa Limited | Professional & scientific | 2025 |
| Forth Valley Community Impact CIC | Education | 2026 |
| Fortified Property Ltd | Real estate | 2013 |
| Fortitude Omnis Group Ltd | Information & communication | 2025 |
| Fortium Surveying Limited | Professional & scientific | 2021 |
| Fortix Ltd | Real estate | 2021 |
| Fortlock Estates Ltd | Real estate | 2025 |
| Fortnum Commerce Ltd | Wholesale & retail | 2025 |
| Fortress Technologies Ltd | Information & communication | 2023 |
| Fortune House ZP Ltd | Hospitality | 2024 |
| Fortune London Limited | Hospitality | 2024 |
| Fortwilliam Ltd | Real estate | 2017 |
| Forty Two Tattoo Ltd | Other services | 2020 |
| Fortyfoot Ltd | Hospitality | 2025 |
| Forums International Ltd. | Administrative & support | 2015 |
| Forward Assist Finance Ltd | Professional & scientific | 2024 |
| Forward Environmental Limited | Water & waste | 2005 |
| Forward Realty Limited | Real estate | 2012 |
| Forward Realty Partnership Limited | Construction | 2015 |
| Forwardpush Limited | Information & communication | 1996 |
| Forza Equity Group Limited | Professional & scientific | 2024 |
| Forza Estates Limited | Real estate | 2024 |
| Forza Heights Limited | Real estate | 2026 |
| Fosse Medical Aesthetics Ltd | Health & social care | 2026 |
| Fossoway Consulting Limited | Real estate | 2017 |
| Foster Care Organisation International Limited | Health & social care | 1992 |
| Foster Dispatch Limited | Transport & logistics | 2025 |
| Foster's Party's and Event's Limited | Hospitality | 2025 |
| Fosters of Thrybergh Limited | Wholesale & retail | 1959 |
| Fotovalue Limited | Extraterritorial | 1954 |
| Foujia Ltd | Wholesale & retail | 2021 |
| Foulstone Forge Limited | Manufacturing | 1990 |
| Found Recruitment Services Limited | Administrative & support | 2024 |
| Foundation Plant and Equipment Limited | Administrative & support | 2006 |
| Founders United Ltd | Professional & scientific | 2024 |
| Foundry Adventure Centre Limited | Arts & recreation | 2002 |
| Foundry Catering Services Ltd | Hospitality | 1999 |
| Foundry Climbing Coaching Ltd | Education | 2015 |
| Foundry Coffee Roasters Limited | Wholesale & retail | 2012 |
| Foundry Electronics Limited | Manufacturing | 2017 |
| Foundry Medical Group (Workforce) Ltd | Health & social care | 2018 |
| Foundry Medical Group Limited | Health & social care | 2016 |
| Fountain & Fountain Limited | Real estate | 2019 |
| Fountside Consulting Limited | Information & communication | 2025 |
| Four Elements Brew Co Ltd | Manufacturing | 2026 |
| Four Hands Support Service Ltd | Public administration | 2019 |
| Four MAN Walk Investments Limited | Professional & scientific | 2018 |
| Four Seasons Cantonese Restaurant Ltd | Hospitality | 2017 |
| Four Seasons Home Improvements Limited | Manufacturing | 2023 |
| Four Seasons Vehicle Solutions Ltd | Wholesale & retail | 2016 |
| Four Sticks Limited | Households | 2019 |
| Four Tree Design Limited | Professional & scientific | 2025 |
| Four Walls Property Limited | Real estate | 2016 |
| Foureleven Business Solutions Limited | Professional & scientific | 2009 |
| Fourjaw Manufacturing Analytics Ltd | Information & communication | 2020 |
| Fourjaw Systems Ltd | Information & communication | 2023 |
| Fourth Decade Fitness Ltd | Health & social care | 2023 |
| Fourth Propco Ltd | Real estate | 2017 |
| Fourways Traffic Management Ltd | Construction | 2021 |
| Fowler Sandford LLP | | 2014 |
| FOX Aluminium Limited | Construction | 2001 |
| FOX and Hounds PH Ltd | Hospitality | 2025 |
| FOX Audio Hire Limited | Administrative & support | 2011 |
| FOX Catering Equipment Ltd | Other services | 2011 |