| Flip Flop Conversions Limited | Wholesale & retail | 2019 |
| Flip IT UK Limited | Hospitality | 2026 |
| Flip N DIP Ltd | Professional & scientific | 2021 |
| Fliss Ltd | Real estate | 2025 |
| Flittfit Limited | Professional & scientific | 2023 |
| FLM Cladding Ltd | Construction | 2019 |
| FLO & Zara Ltd | Wholesale & retail | 2021 |
| FLO 3D Limited | Manufacturing | 2016 |
| FLO Woodworking Ltd | Manufacturing | 2020 |
| Float PR Limited | Professional & scientific | 2016 |
| Flofax Properties Ltd | Real estate | 2026 |
| Flofinance Limited | Professional & scientific | 2024 |
| Flojoe Ltd | Manufacturing | 2021 |
| Floor Decor (Hillsborough) Limited | Construction | 2016 |
| FLOOR9DESIGN Ltd | Information & communication | 2014 |
| Floorart Creative Installations Limited | Construction | 2003 |
| Floorcrete Limited | Construction | 2008 |
| Flooring Point Ltd | Wholesale & retail | 2025 |
| Flooring Services Group Limited | Construction | 2024 |
| FLOORING4U Ltd | Wholesale & retail | 2025 |
| Floorscan Acoustics Limited | Administrative & support | 1994 |
| Flora (UK) Ltd | Manufacturing | 2014 |
| Flora Devlin Ltd | Information & communication | 2021 |
| Flora Makhsoos Limited | Wholesale & retail | 2025 |
| Flora Weddngs & Events Ltd | Wholesale & retail | 2022 |
| Florence Works Limited | Real estate | 2024 |
| Floreon Technology Limited | Professional & scientific | 2011 |
| Florida Convenience Food Store Limited | Wholesale & retail | 2023 |
| Florida Ltd | Professional & scientific | 2007 |
| Florida Realty T C Ltd | Professional & scientific | 2026 |
| Florida.Co.Uk Ltd | Professional & scientific | 2007 |
| Flouch Engineering Co. Limited | Manufacturing | 1960 |
| Flouch Transport Co. Limited | Transport & logistics | 1968 |
| Flounder Head Bars Ltd | Hospitality | 2024 |
| Flourish Florists Limited | Wholesale & retail | 2017 |
| Flourish in Style Ltd | Health & social care | 2021 |
| Floven Analytics Ltd | Information & communication | 2026 |
| Flow and Flame Heating Limited | Wholesale & retail | 2025 |
| Flow Boxing Company Limited | Arts & recreation | 2022 |
| Flow Simulation Limited | Information & communication | 1987 |
| Flow Solutions Limited | Information & communication | 1986 |
| FLOW365 Automation Ltd | Information & communication | 2026 |
| Flower & Roots Business Exchange Limited | Administrative & support | 2017 |
| Flower Blocks Ltd | Professional & scientific | 2022 |
| FLOWER125HEALTH CIC | Health & social care | 2019 |
| Flowerpot Homes Ltd | Households | 2025 |
| Flowersbyteex Ltd | Wholesale & retail | 2025 |
| Flowing Floors Limited | Construction | 2018 |
| Flowisland Limited | Wholesale & retail | 2025 |
| Flowledger Ltd | Information & communication | 2018 |
| Flowright Services Ltd | Construction | 2026 |
| Flowshell Limited | Health & social care | 1991 |
| FLP Services Limited | Information & communication | 2024 |
| Fluent Films Limited | Information & communication | 2012 |
| Fluffy's FAB World Ltd | Information & communication | 2020 |
| Fluid HD Limited | Information & communication | 2002 |
| Flux Dispatch Freight Limited | Transport & logistics | 2021 |
| Flux Lash Bar Ltd | Other services | 2018 |
| Fluxsupply Ltd | Wholesale & retail | 2025 |
| FLY Foods Ltd | Hospitality | 2024 |
| Fly-Back Festival Ltd | Arts & recreation | 2025 |
| Flyawave Games Ltd | Arts & recreation | 2025 |
| Flycheese Productions Ltd | Information & communication | 2013 |
| Flycheese Studio Limited | Information & communication | 2013 |
| Flydvl Food and Delivery Ltd | Transport & logistics | 2025 |
| Flyerblitz Marketing Ltd | Manufacturing | 2025 |
| Flyford Connect Limited | Information & communication | 2014 |
| Flying Custard Workshop Ltd | Professional & scientific | 2018 |
| Flying Horse Lawn Limited | Agriculture & fishing | 2021 |
| Flying Leopard Productions Ltd. | Information & communication | 2023 |
| Flying Orcas Limited | Information & communication | 2025 |
| Flying Phoenix Group Limited | Information & communication | 2025 |
| Flynn Property Holdings Ltd | Real estate | 2022 |
| FM Deluxe Barber Limited | Other services | 2025 |
| FM Mechanical Ltd | Administrative & support | 2017 |
| FM Medical Service Ltd | Health & social care | 2014 |
| FM Property Management Limited | Real estate | 2004 |
| FME Property Ltd | Real estate | 2023 |
| FMF Medicals Ltd | Health & social care | 2021 |
| Fmjs Services Ltd | Professional & scientific | 2020 |
| FML 247 Ltd | Administrative & support | 2021 |
| FML Global Ltd | Transport & logistics | 2026 |
| FML Information Solutions Limited | Information & communication | 2012 |
| FMT Properties Limited | Real estate | 2023 |
| FNF Joinery Ltd | Construction | 2025 |
| FNP Holdings Limited | Real estate | 2018 |
| FNR FOX Ltd | Hospitality | 2022 |
| Foam Cleaning Ltd | Other services | 2024 |
| Fobbspay Limited | Information & communication | 2025 |
| Focal Light Ltd | Health & social care | 2019 |
| Focal Point Technology Limited | Professional & scientific | 2012 |
| Foclover Ltd | Wholesale & retail | 2025 |
| Focus and Move Limited | Other services | 2019 |
| Focus Family Mediation LLP | | 2011 |
| Focus Food Solutions Ltd | Professional & scientific | 2012 |
| Focus Optical Group Ltd | Health & social care | 2019 |
| FOCUS101 Limited | Administrative & support | 2018 |
| Focused Property Management Ltd | Real estate | 2024 |
| Focussingonphotography Ltd | Professional & scientific | 2014 |
| Fogg Tree Developments Limited | Construction | 2011 |