| Fleet Line Ltd | Transport & logistics | 2021 |
| Fleet MKT Ltd | Wholesale & retail | 2025 |
| Fleet Planner Compliance Solutions Ltd | Professional & scientific | 2014 |
| Fleet Sales (Leicester) Limited | Wholesale & retail | 2012 |
| Fleet Vehicle Disposals Limited | Wholesale & retail | 2018 |
| FLEET4ALL Ltd | Transport & logistics | 2026 |
| Fleetcargo Group Ltd | Transport & logistics | 2025 |
| Fleetman Limited | Wholesale & retail | 2023 |
| Fleetwell Management Ltd | Real estate | 2023 |
| Fleksible Deliveries Ltd | Transport & logistics | 2023 |
| Flemdale Ltd | Wholesale & retail | 2025 |
| Fleming Property Limited | Real estate | 2024 |
| Fletcher Andrew Limited | Professional & scientific | 1996 |
| Fletcher Testing Services Ltd | Professional & scientific | 2026 |
| Fleur Care Services Ltd | Health & social care | 2016 |
| Flex Fleet Services Ltd | Wholesale & retail | 2018 |
| Flex Retail Ltd | Wholesale & retail | 2021 |
| Flex-Stone Limited | Wholesale & retail | 2021 |
| Flexcare Recruitment Limited | Administrative & support | 2025 |
| Flexie Accountants Ltd | Professional & scientific | 2019 |
| Flexigo Ltd | Transport & logistics | 2019 |
| Flexiled Ltd | Manufacturing | 2001 |
| Flexistaff Solutions Ltd | Administrative & support | 2014 |
| Flexsquad Records Intl. Ltd | Other services | 2023 |
| Flexx Fitness Ltd | Arts & recreation | 2025 |
| Flexzone Wear Ltd | Wholesale & retail | 2023 |
| Flickmarket Ltd | Wholesale & retail | 2023 |
| Flint Gifts Ltd | Wholesale & retail | 2011 |
| Flint Real Estate Limited | Real estate | 2023 |
| Flipper's Fresh Fish Limited | Administrative & support | 2017 |
| Flipping Houses Ltd | Real estate | 2024 |
| Flipping Properties Limited | Real estate | 2018 |
| Fliximer Ltd | Wholesale & retail | 2025 |
| Flixton Unparalleled Ltd | Transport & logistics | 2015 |
| Flixtonia Ltd | Real estate | 2026 |
| Flknr Limited | Administrative & support | 2024 |
| Flogas Britain Limited | Wholesale & retail | 1970 |
| Flogas Enterprise Solutions (UK) Limited | Professional & scientific | 2010 |
| Floor Sure Ltd | Wholesale & retail | 2024 |
| Floormart Limited | Construction | 2002 |
| Floorpath Limited | Construction | 2002 |
| FLOORTECH360 Limited | Construction | 2025 |
| Flora Bros Contractors Ltd | Construction | 2020 |
| Flora Equip Ltd | Wholesale & retail | 2025 |
| Flora Lettings Ltd | Real estate | 2021 |
| Flora Properties Limited | Households | 2022 |
| Florafair Ltd | Other services | 2024 |
| Floral Imports Ltd | Wholesale & retail | 2016 |
| Florel Healthcare Limited | Health & social care | 2022 |
| Florence Footwear Limited | Arts & recreation | 2016 |
| Florence Grace Photography Ltd | Professional & scientific | 2025 |
| Florence Wragg London Ltd. | Wholesale & retail | 2021 |
| Florin Berzovan Limited | Manufacturing | 2024 |
| Florinsymplu Ltd | Transport & logistics | 2017 |
| Flortranss Ltd | Transport & logistics | 2019 |
| Floryo Transport Ltd | Transport & logistics | 2025 |
| Floss Ltd | Manufacturing | 2024 |
| Flossophy Limited | Health & social care | 2020 |
| Flow and AMY Transport Ltd | Transport & logistics | 2024 |
| Flow Mech Products Limited | Manufacturing | 1992 |
| Flower Company (Leicester) Ltd | Wholesale & retail | 2020 |
| Flower Corner Leicester Ltd | Wholesale & retail | 2024 |
| Flower Cosmetic Ltd | Wholesale & retail | 2019 |
| Flower Fashion Limited | Manufacturing | 2019 |
| Flowers Florist Ltd | Other services | 2024 |
| Flowerworks Ltd | Wholesale & retail | 2004 |
| Flowette Limited | Manufacturing | 2021 |
| Flowmaster Plumbing Limited | Construction | 2011 |
| Fltx (UK) Limited | Wholesale & retail | 2018 |
| Fluffy Fluffy Ltd | Hospitality | 2022 |
| Fluffy Plushy Ltd | Manufacturing | 2026 |
| Fluffy Studio Ltd | Other services | 2023 |
| Fluid Funding Ltd | Financial services | 2016 |
| Fluid Power Recruitment Ltd | Administrative & support | 2017 |
| Flumpy Clothing Ltd | Wholesale & retail | 2024 |
| Flutetoot Marketing Ltd | Information & communication | 2024 |
| Fluxvia Ltd | Professional & scientific | 2025 |
| FLY Green Ltd | Transport & logistics | 2025 |
| FLY Well Travel Limited | Administrative & support | 2000 |
| FLY With B Limited | Administrative & support | 2025 |
| Flyaway Cars Ltd | Administrative & support | 2025 |
| Flych Ltd | Wholesale & retail | 2025 |
| Flyers Inn Ltd | Administrative & support | 2019 |
| Flyes Ltd | Information & communication | 2022 |
| Flying Agri Ltd | Manufacturing | 2023 |
| Flying Dutchman Transport Ltd | Manufacturing | 2016 |
| Flying PIG Pies Limited | Hospitality | 2022 |
| Flying Spares Limited | Wholesale & retail | 2001 |
| Flying Taxi Ltd | Transport & logistics | 2023 |
| Flying Triangle Events Ltd | Arts & recreation | 2023 |
| Flynn Crane Hire (UK) Ltd | Administrative & support | 2025 |
| Flynnconn Limited | Professional & scientific | 2026 |
| Flyover International Ltd | Wholesale & retail | 2020 |
| Flysacred Limited | Transport & logistics | 2022 |
| FM & Willows Plumbing and Heating Limited | Construction | 2019 |
| FM & Willows Property Limited | Real estate | 2025 |
| FM Brothers Ltd | Hospitality | 2025 |
| FM Creators Limited | Wholesale & retail | 2025 |
| FM Driving Academy Ltd | Education | 2023 |
| FM Fabs Ltd | Manufacturing | 2022 |