| Flatstones Limited | Information & communication | 2015 |
| Flavio Driver Ltd | Transport & logistics | 2019 |
| Flavory Ltd | Hospitality | 2024 |
| Flavour Horizons Limited | Information & communication | 2017 |
| Flavourz and Soundz Limited | Hospitality | 2025 |
| Flawless Beauty and Laser Clinic Ltd | Other services | 2023 |
| Flax Bourton Village CIC | Administrative & support | 2006 |
| Flax Property Limited | Real estate | 2026 |
| Fledglings Day Nursery (Fishponds) Ltd | Health & social care | 2019 |
| Fleet Force Limited | Professional & scientific | 2009 |
| Fleet Taxis Ltd | Extraterritorial | 2014 |
| Fleetboost Limited | Wholesale & retail | 2026 |
| Fleetbridge Express Ltd | Transport & logistics | 2026 |
| Fleetwheel Limited | Wholesale & retail | 1975 |
| Fleetwise Associates Ltd | Professional & scientific | 2020 |
| Fleetwood E S Holdings Limited | Water & waste | 2016 |
| Fleksihouse UK Ltd | Other services | 2025 |
| Fleming Kicks Ltd | Wholesale & retail | 2024 |
| Fleminngs Ltd | Hospitality | 2021 |
| Flesbis Limited | Health & social care | 2015 |
| Fleshment Theatre Ltd | Arts & recreation | 2025 |
| Fletcher & Sons Building & Renovations Ltd | Construction | 2022 |
| Fletcher Alexander Business Solutions Ltd | Financial services | 2013 |
| Fletcher Shaw & Co. Ltd | Financial services | 2012 |
| Flett Gill Limited | | 1986 |
| Fleur Bell-Hendriks Ltd | Information & communication | 2025 |
| Fleur T Limited | Manufacturing | 2001 |
| Fleurtations Florist Bristol Limited | Wholesale & retail | 2023 |
| Flex Clinic Ltd | Administrative & support | 2026 |
| Flex Digital Ltd | Information & communication | 2019 |
| Flex Digital Solutions Ltd | Professional & scientific | 2025 |
| Flexableit Ltd | Information & communication | 2012 |
| Flexalign Ltd | Wholesale & retail | 2025 |
| Flexe Pilates Limited | Arts & recreation | 2025 |
| Flexfactor Limited | Financial services | 2022 |
| Flexfi Solutions Limited | Information & communication | 2023 |
| Flexi-Solutions Ltd | Administrative & support | 2010 |
| Flexibulk Limited | Wholesale & retail | 1978 |
| Flexiforce U.K. Limited | Manufacturing | 1992 |
| Flexipads World Class Limited | Manufacturing | 2003 |
| Flexistay Properties Ltd | Real estate | 2024 |
| Flexmesh Ltd | Manufacturing | 2025 |
| Flexo Holdings Ltd | Financial services | 2025 |
| Flexo Springs Limited | Manufacturing | 1928 |
| Flexright Ukeig | | 1998 |
| Flexworks HR Consulting Ltd | Administrative & support | 2020 |
| Flexys Solutions Ltd | Administrative & support | 2016 |
| FLI Precast Solutions UK Limited | Construction | 2017 |
| Flibbertigibbet Theatre | Arts & recreation | 2017 |
| Flight Engineering Ltd | Professional & scientific | 2015 |
| Flight Feather Ltd | Professional & scientific | 2020 |
| Flights to Spain Ltd | Extraterritorial | 2024 |
| Flikk Ltd | Information & communication | 1994 |
| Flint and Wild Ltd | Other services | 2014 |
| Flint Branding Limited | Administrative & support | 2008 |
| Flintmore Limited | Professional & scientific | 2007 |
| Flintridge Resources Limited | Mining & quarrying | 2013 |
| Flip the Script (FTS) Ltd | Information & communication | 2023 |
| Flipinvest Ltd | Real estate | 2024 |
| Flippin' Dog Limited | Agriculture & fishing | 2012 |
| Flixbus UK Ltd. | Transport & logistics | 2019 |
| FLK Engineering Ltd | Professional & scientific | 2015 |
| FLK Limited | Other services | 2009 |
| FLL Ltd | Information & communication | 2026 |
| FLO Electrics Limited | Construction | 2016 |
| FLO Grand Work Ltd | Construction | 2023 |
| FLO Rothwell Ltd | Professional & scientific | 2025 |
| Flo-Jo Fabrics Limited | Wholesale & retail | 2018 |
| FLOAT8 Ltd | Construction | 2019 |
| Floating Carousel Transport and Storage Limited | Professional & scientific | 2011 |
| Floating Harbour Films Limited | Information & communication | 2016 |
| Floating Harbour Studios Limited | Information & communication | 2012 |
| Floatmylk Ltd | Manufacturing | 2023 |
| Floatzone Residents Association Limited | Households | 1986 |
| Flock Hospitality Limited | Hospitality | 2025 |
| Flock Hub Ltd | Information & communication | 2026 |
| Flocosu C Couriers Ltd | Transport & logistics | 2023 |
| Flodela Ltd | Wholesale & retail | 2021 |
| Flogic Ltd | Administrative & support | 2012 |
| Flogyourcar Ltd | Other services | 2020 |
| Flojan Ltd | Construction | 2015 |
| Floodsure Ltd | Construction | 2013 |
| Flook Engineering Limited | Manufacturing | 2026 |
| Floor Everest Limited | Construction | 2021 |
| Floor Group Limited | Financial services | 2024 |
| Flooring Konnect Limited | Construction | 2024 |
| Flop Shot Fortune Ltd | Wholesale & retail | 2026 |
| Floq Ltd | Administrative & support | 2024 |
| Flora Drinks Ltd | Professional & scientific | 2024 |
| Flora Moody Limited | Information & communication | 2014 |
| FLORA11 Ltd | Hospitality | 2024 |
| Floral Tours Limited | Administrative & support | 2013 |
| Florence Court (Redland) Management Company Limited | Households | 1979 |
| Florence Heritage Limited | Construction | 2020 |
| Florence Mews Management Company Limited | Households | 2018 |
| Flori Care Ltd | Health & social care | 2021 |
| Floriclean Ltd | Administrative & support | 2015 |
| Floricore Limited | Wholesale & retail | 2026 |
| Florika Limited | Information & communication | 2021 |
| Florin PLASTERING1 Ltd | Administrative & support | 2025 |