| Florin Tudor Transport Limited | Transport & logistics | 2014 |
| Florin X Limited | Administrative & support | 2025 |
| FLORIN76 Ltd | Hospitality | 2019 |
| Florineltrans Ltd | Transport & logistics | 2019 |
| Florin’S Bar Bristol Ltd | Hospitality | 2025 |
| Floris Animal Health Limited | Extraterritorial | 2020 |
| Florza Ltd | Administrative & support | 2023 |
| Flos Vitae Limited | Financial services | 2019 |
| Flourish and Grace Ltd | Wholesale & retail | 2023 |
| Flourish Bioscience Ltd | Professional & scientific | 2025 |
| Flourish in Therapy Ltd | Health & social care | 2026 |
| Flourishing Education Ltd. | Education | 2014 |
| Flow Bookkeeping Ltd | Professional & scientific | 2025 |
| Flow Holding Limited | Wholesale & retail | 2009 |
| Flow Incident Systems Limited | Information & communication | 2026 |
| Flow Skills Online Ltd | Education | 2024 |
| Flow Sure Drains Ltd | Water & waste | 2023 |
| Flow With the Seasons App Ltd | Information & communication | 2024 |
| Flowboard Health Ltd | Information & communication | 2025 |
| Flowcrete Group Limited | Financial services | 1996 |
| Flowcrete International Ltd | Financial services | 1988 |
| Flower & Scoop Ltd | Wholesale & retail | 2025 |
| Flower BOY Ltd | Wholesale & retail | 2024 |
| Flowerpot Productions Limited | Information & communication | 2020 |
| Flowerpot Properties Limited | Real estate | 2019 |
| Flowerpot Publications Limited | Information & communication | 2020 |
| Flowers by Thea Limited | Wholesale & retail | 2012 |
| Flowervision Southampton Limited | Wholesale & retail | 2007 |
| Flowmasta Limited | Construction | 2025 |
| Flowmo Limited | Information & communication | 2006 |
| Floworx Drainage Solutions Ltd | Water & waste | 2025 |
| Flowsultants Limited | Professional & scientific | 2025 |
| Flowtide Limited | Information & communication | 2010 |
| Floyd Gray New Homes Sales Solutions Limited | Professional & scientific | 2019 |
| Flpo Ltd | Construction | 2025 |
| FLS Surveys Ltd | Professional & scientific | 2024 |
| Flsz Ltd | Construction | 2025 |
| FLT Properties Limited | Real estate | 2021 |
| Flue Centres Limited | Real estate | 1995 |
| Fluer DE LYS Management Company Limited | Households | 2025 |
| Fluid Building Services Ltd | Other services | 2017 |
| Fluid Mechanics 101 Ltd | Wholesale & retail | 2020 |
| Fluidsmart Limited | Professional & scientific | 2016 |
| Fluoretiq Limited | Professional & scientific | 2017 |
| Flute Theatre | Arts & recreation | 2014 |
| Flux Consulting Ltd | Administrative & support | 2006 |
| Flux Homes Ltd | Real estate | 2021 |
| Flux Jewellery Ltd. | Manufacturing | 2016 |
| Flux Transport Ltd | Professional & scientific | 2025 |
| Fluxify Ltd | Professional & scientific | 2018 |
| Fluxxo Limited | Wholesale & retail | 2025 |
| FLV Group Limited | Wholesale & retail | 2022 |
| FLY Girl Foundation C.I.C. | Public administration | 2025 |
| FLY Higher Coaching Limited | Other services | 2018 |
| Flybikefly Limited | Transport & logistics | 2013 |
| Flybikefly.Com Limited | Transport & logistics | 2013 |
| Flycat Resources Limited | Financial services | 2025 |
| Flyer DE LYS Ltd | Construction | 2020 |
| Flying Aspidistra Limited | Administrative & support | 2013 |
| Flying Colours Consultancy Limited | Information & communication | 2023 |
| Flying Colours Entertainment Limited | Administrative & support | 2006 |
| Flying IT Ltd | Information & communication | 2015 |
| Flying Quokka Software Limited | Information & communication | 2001 |
| Flynergy Ltd | Construction | 2022 |
| Flytek Limited | Administrative & support | 2014 |
| Flytrans Ltd | Transport & logistics | 2021 |
| Flytrap Limited | Arts & recreation | 2011 |
| Flywing Acro Ltd | Wholesale & retail | 2025 |
| FM Maintenance and Construction Ltd | Construction | 2021 |
| FM Property Improvements Ltd | Manufacturing | 2023 |
| FM VET Solutions Limited | Professional & scientific | 2018 |
| FMA19 Ltd | Manufacturing | 2019 |
| Fmart Global Ltd | Wholesale & retail | 2026 |
| FMD Ventures LLP | | 2022 |
| FMN Drinks (UK) Limited | Manufacturing | 2022 |
| Fmsi Ltd | Information & communication | 2022 |
| FMU Limited | Health & social care | 2026 |
| Fmyts Limited | Construction | 2025 |
| FNC Fresh 'N' Clean Motors Limited | Wholesale & retail | 2015 |
| Fnsc Ltd | Construction | 2025 |
| FO Assets Limited | Real estate | 2020 |
| Foale Trading Limited | Financial services | 2002 |
| Foam Cutting & Design Ltd | Manufacturing | 2000 |
| Foam for Home Wholesale Ltd | Extraterritorial | 2013 |
| Foam Techniques Limited | Manufacturing | 1986 |
| FOB Media Ltd | Hospitality | 2012 |
| Fobisprincipal Limited | Hospitality | 2017 |
| Focal Drinks Ltd | Extraterritorial | 2023 |
| Focus 4 Limited | Education | 2019 |
| Focus Accountancy Limited | Professional & scientific | 2007 |
| Focus and Vision Technology Limited | Wholesale & retail | 2013 |
| Focus Building & Maintenance Services Ltd | Construction | 2011 |
| Focus Design Partnership Limited | Administrative & support | 2002 |
| Focus Productions Limited Partnership | | 1993 |
| Focus Productions West Limited Partnership | | 1994 |
| Focus Property Renovations Limited | Construction | 2021 |
| Focus Publications Ltd | | 1988 |
| Focus Tiger Ltd | Professional & scientific | 2024 |
| Focused Labs UK Ltd | Information & communication | 2025 |
| Focused Wealth Ltd | Financial services | 2026 |