| Floor Heating Systems Limited | Wholesale & retail | 2001 |
| Floor IT Ltd | Construction | 2023 |
| Floor Maintenance Services Limited | Real estate | 1976 |
| Floorcraft by C. R. LEE & Sons Limited | Construction | 2005 |
| Floorology Limited | Wholesale & retail | 2018 |
| Floors WE Love Ltd | Construction | 2020 |
| Floorshow (Nottingham) Limited | Professional & scientific | 2014 |
| Floortrade Long Eaton Ltd | Wholesale & retail | 2014 |
| Flor Distribution Ltd | Wholesale & retail | 2025 |
| Floral Innovations Ltd | Wholesale & retail | 2017 |
| Floral Sensations by DAN Ltd | Wholesale & retail | 2025 |
| Floral Street 1979 Limited | Real estate | 2022 |
| Floral Street Investment Properties Limited Liability Partnership | | 2006 |
| Floral Street Property Partners Limited | Real estate | 2005 |
| Floral Weddings & Events Limited | Wholesale & retail | 2020 |
| Floralands at Lambley Limited | Wholesale & retail | 2018 |
| Floralands Farm Park Limited | Arts & recreation | 2017 |
| Floralands Village Limited | Real estate | 2023 |
| Florale Ltd | Wholesale & retail | 2025 |
| Florapac Limited | Wholesale & retail | 2015 |
| Florence Health & Beauty Limited | Manufacturing | 2017 |
| Florence Plumbing and Heating Ltd | Construction | 2024 |
| Florentinos Pizzeria & Kebabs Ltd | Hospitality | 2026 |
| Florentinos Pizzeria (Doncaster) Limited | Hospitality | 2016 |
| Florian Baloiu Driver Ltd | Transport & logistics | 2021 |
| Floribus Limited | Wholesale & retail | 2019 |
| Florii Limited | Extraterritorial | 2024 |
| Florin Properties Limited | Real estate | 2025 |
| FLOSKITCHEN1POOLSTREET Ltd. | Hospitality | 2018 |
| Flotex Ltd | Construction | 2024 |
| Flotex Property Management Ltd | Real estate | 2017 |
| Flow & Roll Collective Ltd | Education | 2025 |
| Flow Chemicals Limited | Wholesale & retail | 2025 |
| Flow Executive Search Ltd | Administrative & support | 2019 |
| Flow Integration Ltd | Information & communication | 2026 |
| Flow Kayaks Limited | Wholesale & retail | 2018 |
| Flow Reformer Studios Ltd | Arts & recreation | 2026 |
| Flow: ELT Services Ltd | Information & communication | 2015 |
| Floware Limited | Extraterritorial | 2024 |
| Flowchemuk Ltd | Wholesale & retail | 2022 |
| Flowerbunny Limited | Wholesale & retail | 2024 |
| Floweredene Properties Ltd | Real estate | 2017 |
| Flowerpetal Limited | Arts & recreation | 2025 |
| Flowers by Susan Ltd | Wholesale & retail | 2008 |
| Flowers on Main Street Ltd | Wholesale & retail | 2024 |
| Flowhouse(Beeston) Limited | Wholesale & retail | 2025 |
| Flowt Holdings Limited | Real estate | 2024 |
| Flowt Ltd | Wholesale & retail | 2021 |
| Flowthermolab Ltd | Professional & scientific | 2022 |
| Flowthinking Ltd | Professional & scientific | 2018 |
| Flowtrail Limited | Professional & scientific | 2026 |
| FLOXY4REAL Estates Ltd | Real estate | 2023 |
| Floyd Legal Limited | Professional & scientific | 2025 |
| Floys Catering Limited | Hospitality | 2018 |
| Fluff NET Ltd | Professional & scientific | 2021 |
| Fluid Dynamics Ltd | Construction | 2008 |
| Fluid Properties Limited | Real estate | 2016 |
| Flux Medical Limited | Information & communication | 2025 |
| Flux Search Ltd | Information & communication | 2025 |
| Flux Thinking Limited | Professional & scientific | 2019 |
| Fluxpoint Advisory Ltd | Professional & scientific | 2026 |
| FLY Investment Group Limited | Real estate | 2024 |
| FLY Light Sky Limited | Transport & logistics | 2023 |
| FLY ME High Ltd. | Information & communication | 2023 |
| FLY Studios Limited | Professional & scientific | 2020 |
| FLY Vintage Ltd | Wholesale & retail | 2025 |
| Flyhoward Ltd | Agriculture & fishing | 2006 |
| Flying Cows Consulting Limited | Administrative & support | 2006 |
| Flying Goat Limited | Health & social care | 2007 |
| Flying High Expressive Arts CIC | Arts & recreation | 2017 |
| Flying High Trust | Education | 2012 |
| Flying Penguin AI Limited | Information & communication | 2026 |
| Flying Student Ltd | Administrative & support | 2017 |
| Flying Wild HOG Holding Limited | Information & communication | 2018 |
| Flyn.App Ltd | Wholesale & retail | 2024 |
| Flynn Forge Ltd | Education | 2026 |
| Flynsec Limited | Administrative & support | 2024 |
| Flyproperty Ltd | Real estate | 2024 |
| FLZ Ltd | Construction | 2025 |
| FM Consultancy Ltd | Health & social care | 2015 |
| FM Holidings and Services Limited | Real estate | 2025 |
| FM QS Ltd | Professional & scientific | 2020 |
| FM SA Ltd | Wholesale & retail | 2025 |
| FM2 Electrical Ltd | Construction | 2019 |
| FMB Haulage Ltd | Transport & logistics | 2025 |
| FMB Landscaping & Driveways Ltd | Administrative & support | 2025 |
| FMB Portfolio Limited | Real estate | 2022 |
| FMB Properties (Midlands) Limited | Real estate | 2025 |
| Fmcg Consult Ltd | Professional & scientific | 2020 |
| FMI Estates Limited | Real estate | 2025 |
| Fmpy Ltd | Information & communication | 2022 |
| FMS House Limited | Construction | 2025 |
| FMT Training Academy Limited | Education | 2026 |
| FN Customs Limited | Transport & logistics | 2018 |
| FN Properties Ltd | Real estate | 2024 |
| FNC Utilities Ltd | Construction | 2019 |
| FNK Designs Ltd | Information & communication | 2014 |
| FNK Ltd | Other services | 2025 |
| FNT Property Ltd | Real estate | 2016 |
| Focal Strength Limited | Professional & scientific | 2012 |