| FK Property Services Ltd | Real estate | 2017 |
| FKM Ltd | Transport & logistics | 2017 |
| Flame'N'Flavor Ltd | Hospitality | 2025 |
| Flanaghan Estates Ltd | Real estate | 2025 |
| Flannery Builders Limited | Construction | 2017 |
| Flash Medical Services Ltd | Health & social care | 2011 |
| Flash Weddings Ltd | Manufacturing | 2025 |
| Flashback Retro Ltd | Wholesale & retail | 2022 |
| Flashware Solutions Limited | Information & communication | 2010 |
| Flass Lane Management Company Limited | Households | 2016 |
| Flawless Aesthetics by Samantha Challinor Ltd | Other services | 2024 |
| Fleet Glazing Limited | Construction | 2021 |
| Fleetgrant Limited | Wholesale & retail | 1984 |
| Fleeting FOX Antiques Ltd | Wholesale & retail | 2019 |
| Fleetrec Ltd | Transport & logistics | 2026 |
| Fletcher Building Services (Yorkshire) Ltd | Construction | 2026 |
| Fletcher Films Ltd | Professional & scientific | 2023 |
| Fletchers Project Managment Ltd | Construction | 2019 |
| Fletchers Property Renovations Ltd | Real estate | 2026 |
| Flex Residential Limited | Real estate | 2021 |
| Flexiworx UK Ltd | Arts & recreation | 2020 |
| Flintwall Investments Limited | Real estate | 2015 |
| Flip and Thrift Limited | Wholesale & retail | 2024 |
| Flipfusion Ltd | Wholesale & retail | 2026 |
| FLO Glham Clothings Ltd | Wholesale & retail | 2026 |
| Flo-Logistic Ltd | Transport & logistics | 2025 |
| Flofort Cleaning Ltd | Administrative & support | 2025 |
| Floor Coverings Local Limited | Construction | 2016 |
| Floor Cure UK Ltd | Construction | 2023 |
| Floor Decor (Doncaster) Limited | Wholesale & retail | 2016 |
| Floor Heating (UK) Limited | Construction | 2012 |
| Florahs Parr Ltd | Wholesale & retail | 2025 |
| Floral Expressions Limited | Wholesale & retail | 2018 |
| Floral Expressions Weddings Limited | Wholesale & retail | 2023 |
| Florence Blanchard Limited | Professional & scientific | 2013 |
| Florentinos TH Limited | Hospitality | 2017 |
| Floriarianna Ltd | Health & social care | 2019 |
| Florin Mucenicu Ltd | Transport & logistics | 2019 |
| Florin O Transport Ltd | Transport & logistics | 2025 |
| Flourishparadise Limited | Hospitality | 2022 |
| Flower POT Lane by Megan Limited | Wholesale & retail | 2024 |
| Flowers @ Foers Ltd | Wholesale & retail | 2024 |
| Flowlane Logistics Ltd | Transport & logistics | 2025 |
| Flowmech Limited | Construction | 2024 |
| Flowtech Mechanical Limited | Construction | 2019 |
| Flowvolt Ltd | Construction | 2025 |
| Fluid Maintenance Solutions Limited | Manufacturing | 2008 |
| Fluxd Beauty Training Group Ltd | Other services | 2021 |
| FLX Entertainment Group Ltd | Arts & recreation | 2025 |
| FLY High Property Investments Ltd | Real estate | 2025 |
| FLY Nexus Limited | Information & communication | 2026 |
| FLY Tours Limited | Administrative & support | 2025 |
| Flyme Limited | Professional & scientific | 2019 |
| FM Aviation Limited | Manufacturing | 2026 |
| FM Evergreen Ltd | Wholesale & retail | 2025 |
| FML Logistics Limited | Transport & logistics | 2023 |
| FNC Alloys & Metals Ltd | Wholesale & retail | 2004 |
| FNS Roofing Ltd | Construction | 2024 |
| Foam Express Ltd | Other services | 2013 |
| Focus Awards Limited | Education | 2011 |
| Foermac Limited | Hospitality | 2015 |
| Foers Contracts Holdings Limited | Professional & scientific | 2006 |
| Foers Engineering Limited | Manufacturing | 2004 |
| Foers Properties Limited | Real estate | 2000 |
| Foleys Flooring Limited | Wholesale & retail | 2020 |
| Folytek Electrical and Mechanical Ltd | Professional & scientific | 2025 |
| Fondazioni Ltd | Education | 2026 |
| Food Gastronomy Ltd | Hospitality | 2024 |
| Food K Limited | Hospitality | 2025 |
| Foodcast Ltd | Information & communication | 2018 |
| Foodie Friends Ltd | Hospitality | 2025 |
| Foodiez Burgers and Shakes Ltd | Hospitality | 2023 |
| Foodkoncept Limited | Hospitality | 2024 |
| Foodova Ltd | Hospitality | 2026 |
| Foodplus Ltd | Wholesale & retail | 2015 |
| Football Performance Coaching Limited | Education | 2025 |
| Footwear Industries UK Limited | Wholesale & retail | 2021 |
| FOR Every Day Ltd | Wholesale & retail | 2024 |
| Forefront Scaffold Solutions Limited | Administrative & support | 2009 |
| Forest Hill Investment Ltd | Real estate | 2021 |
| Forest Town Chippy Limited | Hospitality | 2024 |
| Foresters Arms Honly Ltd | Hospitality | 2020 |
| Foresters S&R Ltd | Hospitality | 2025 |
| Forever Red Communications Ltd | Wholesale & retail | 2021 |
| Forever Swim Ltd | Education | 2021 |
| Forge Agency Ltd | Information & communication | 2015 |
| Forge Clothing Limited | Wholesale & retail | 2021 |
| Forgebyte Labs Ltd | Information & communication | 2025 |
| Forged Gym Holding Ltd | Arts & recreation | 2026 |
| Forged Gym Ltd | Arts & recreation | 2026 |
| Forgemode Ltd | Wholesale & retail | 2026 |
| Forging Innovation Group Ltd | Manufacturing | 2025 |
| Fork Lift Truck & Plant Training Ltd | Transport & logistics | 2013 |
| Forking Awesome Limited | Hospitality | 2024 |
| Forklift Hire & Sales Holdings Limited | Financial services | 2025 |
| Forklift Hire & Sales Limited | Manufacturing | 2014 |
| Form Supplements Ltd | Wholesale & retail | 2025 |
| Form-It UK Limited | Construction | 2009 |
| Former Lloyds Building Rotherham Limited | Financial services | 2024 |
| Formist Ltd | Information & communication | 2015 |