| Flaresprout Architeconics Limited | Professional & scientific | 2024 |
| Flash Cleaning Service Ltd | Households | 2013 |
| Flash Forward Consulting Limited | Information & communication | 2012 |
| Flashroute Ltd | Transport & logistics | 2026 |
| Flask Thirst Ltd | Wholesale & retail | 2026 |
| Flat 6 Automotive Ltd | Wholesale & retail | 2023 |
| Flat CAP SEO Services Limited | Information & communication | 2021 |
| Flat FEE Recruiter Limited | Administrative & support | 2012 |
| Flat Moon Ltd | Arts & recreation | 2024 |
| Flat OUT Leads Ltd | Professional & scientific | 2026 |
| Flaunt Digital Ltd | Professional & scientific | 2015 |
| Flaunt Investments Limited | Real estate | 2019 |
| Flavell Wealth Management Ltd | Extraterritorial | 2012 |
| Flavius 12345 Ltd | Transport & logistics | 2025 |
| Flavorfusion Firehouse Limited | Hospitality | 2025 |
| Flavour Bliss Limited | Hospitality | 2024 |
| Flavour Kingdom Leeds Limited | Hospitality | 2025 |
| Flavourium Vending Station Ltd | Wholesale & retail | 2026 |
| Flavours Frozen Food Limited | Hospitality | 2025 |
| Flavoursfromhome Ltd | Hospitality | 2024 |
| Flawlessfab Hair Salon Ltd | Other services | 2024 |
| Flax Consulting Limited | Professional & scientific | 2020 |
| Flaxton Court (Bradford) Management Company Limited | Households | 2008 |
| FLC Productions Ltd | Wholesale & retail | 2025 |
| Fleadh Electronics Limited | Professional & scientific | 1998 |
| Flearywell Ltd | Education | 2023 |
| Fleek Marketing Limited | Professional & scientific | 2017 |
| Fleeky Furniture Ltd | Manufacturing | 2025 |
| Fleet Care (Leeds) Limited | Wholesale & retail | 2014 |
| Fleet Lane Consulting Ltd | Professional & scientific | 2023 |
| Fleet N Surface Solutions Ltd | Administrative & support | 2026 |
| Fleet Vehicle Sales Limited | Wholesale & retail | 2025 |
| Fleet Vision 360 Ltd | Wholesale & retail | 2022 |
| Fleetivo Ltd | Transport & logistics | 2026 |
| Fleetsec Ltd | Information & communication | 2024 |
| Fleetsure Logistics Ltd | Administrative & support | 2025 |
| Flender Limited | Manufacturing | 2017 |
| Flesher and Flesher Limited | Manufacturing | 2008 |
| Fletcher & Gill Ltd | Professional & scientific | 2025 |
| Fletcher Electric Ltd | Construction | 2013 |
| Fletcher Hixon Limited | Professional & scientific | 2024 |
| Fletcher Scaffolding (Leeds) Limited | Construction | 2019 |
| Fletchers Beds Limited | Wholesale & retail | 2025 |
| Fletchers Brickwork Ltd | Construction | 2024 |
| Fletchers Roofing Limited | Construction | 2025 |
| Flettner Holdings Ltd | Professional & scientific | 2025 |
| Flex Accommodation Ltd | Real estate | 2024 |
| Flex Electrical Contractors Ltd | Construction | 2018 |
| Flex-Ability Limited | Manufacturing | 1987 |
| Flexibitions Limited | Manufacturing | 2010 |
| Flexible Distribution Solutions Limited | Transport & logistics | 2000 |
| Flexible Drivers Hire Limited | Transport & logistics | 2018 |
| Flexico (Sheff) Collections Limited | Real estate | 2023 |
| Flexico Workspace Limited | Real estate | 2023 |
| Flexico YBN Collections Limited | Real estate | 2023 |
| Flexicore Services Limited | Information & communication | 2024 |
| Flexpack Ltd | Other services | 2025 |
| Flexprint Services Limited | Manufacturing | 2009 |
| Flextank Limited | Professional & scientific | 1968 |
| Flight of K Limited | Arts & recreation | 2023 |
| Flightsea Limited | Construction | 2023 |
| Fligl Ltd | Information & communication | 2017 |
| Fling Limited | Wholesale & retail | 2024 |
| Flint Pension Trustees Limited | Professional & scientific | 2024 |
| Flint Research Limited | Professional & scientific | 1992 |
| Flintwick Limited | Financial services | 2021 |
| Flintwick Lydney Devco Limited | Financial services | 2022 |
| Flintwick Lydney Propco Limited | Financial services | 2022 |
| Flintwick Midco VB Limited | Financial services | 2022 |
| Flip Consulting Limited | Professional & scientific | 2009 |
| Flipfy Technology Group Ltd | Professional & scientific | 2024 |
| Flippin ECK Yorkshire Ltd | Wholesale & retail | 2023 |
| Flipside Engineering Limited | Administrative & support | 2007 |
| Flipstockuk Ltd | Wholesale & retail | 2023 |
| Flite Properties Limited | Real estate | 2002 |
| FLN Property Group Ltd | Real estate | 2025 |
| Flnt Ltd | Professional & scientific | 2025 |
| FLO & Dani Ltd | Transport & logistics | 2019 |
| FLO Communications Ltd | Information & communication | 2017 |
| Float Delivery Ltd | Wholesale & retail | 2024 |
| Floating Abodes Limited | Real estate | 2025 |
| Flockton Gerald Associates Limited | Administrative & support | 2015 |
| Flockton Pickles Estates Limited | Real estate | 2026 |
| Flockton Pickles Investments Ltd | Financial services | 2026 |
| Flocum Ltd | Wholesale & retail | 2025 |
| Flode Limited | Wholesale & retail | 2023 |
| Floeberg Ltd | Administrative & support | 2017 |
| Flongold UK Ltd | Real estate | 2025 |
| Flood Risk UK Ltd | Professional & scientific | 2013 |
| Floodshield Limited | Manufacturing | 2018 |
| Flooring 4 UK Limited | Wholesale & retail | 2021 |
| Flooring Wholesale Yorkshire Ltd | Wholesale & retail | 2022 |
| Floors for Paws Limited | Construction | 2018 |
| FLOORSTORE(2) Ltd | Wholesale & retail | 2018 |
| Floortex Limited | Construction | 1990 |
| Flora Healthcare Limited | Health & social care | 2022 |
| Floral Muse by Joyce Limited | Wholesale & retail | 2025 |
| Florena Cuts & Colour Ltd | Other services | 2026 |
| Florence Nibble Limited | Financial services | 2022 |
| Florenzz Ltd | Wholesale & retail | 2024 |