| Express Environmental Solutions Limited | Water & waste | 2008 |
| Expressessexblinds Ltd | Professional & scientific | 2014 |
| Extreme Rescue Ltd | Administrative & support | 2012 |
| F & I Properties Limited | Real estate | 2020 |
| F Edres Consultancy Ltd | Real estate | 2024 |
| F. R. B. and G. Limited | Professional & scientific | 2023 |
| F1QUOTESTOP Ltd | Wholesale & retail | 2025 |
| F45 Southend Limited | Arts & recreation | 2022 |
| Fabled Tiling Ltd | Construction | 2025 |
| FAC Building and Contractors Ltd | Construction | 2025 |
| Face Value Aesthetics Ltd | Health & social care | 2023 |
| Fairbank Productions Limited | Arts & recreation | 1992 |
| Fannin Painting Contracts Ltd | Construction | 2015 |
| Fantastic Mastic Ltd | Construction | 2025 |
| Farrans Court Limited | Households | 1986 |
| Fast Made Ltd | Manufacturing | 2018 |
| Father's House Properties Ltd | Real estate | 2023 |
| Fazle and Kausar Limited | Health & social care | 2016 |
| Featherstone Barber Company Limited | Other services | 2022 |
| Featherstone Cigar Company Limited | Wholesale & retail | 2023 |
| Felicia Venture Limited | Health & social care | 2019 |
| Felicitas Real Estate Limited | Real estate | 2023 |
| Felicity Aesthetics Limited | Health & social care | 2023 |
| Fenisol Ltd | Manufacturing | 2017 |
| Ferati Drylining Ltd | Construction | 2006 |
| Ferati Interiors Limited | Professional & scientific | 2015 |
| FGK Logistics Ltd | Transport & logistics | 2025 |
| Fiander Plumbing & Heating Limited | Construction | 2008 |
| Fibre 24 Limited | Information & communication | 2025 |
| Field & Co LLP | | 2006 |
| Fielding-Smith Properties Limited | Real estate | 2023 |
| Fierce N Free Limited | Wholesale & retail | 2025 |
| Fifth Contracts Limited | Construction | 2021 |
| Finding Sense Ltd | Health & social care | 2020 |
| Finleyjamesbxr Ltd | Arts & recreation | 2025 |
| Finn Taylor Ltd | Professional & scientific | 2015 |
| Finns Barbers Limited | Other services | 2025 |
| Finstream Ltd | Administrative & support | 2014 |
| Fireplace and Design Limited | Administrative & support | 2009 |
| Fireset Ltd | Public administration | 2025 |
| First Choice Roofers Ltd | Construction | 2025 |
| First Choice Windows Limited | Extraterritorial | 2009 |
| First Class Lets Ltd | Real estate | 2020 |
| First Strike Security Ltd | Administrative & support | 2026 |
| Firstpoint Property Management Ltd | Real estate | 2026 |
| Fisher INK Limited | Professional & scientific | 2002 |
| Fisher Physio Limited | Health & social care | 2013 |
| Fisks Limited | Real estate | 1986 |
| Fitz Fire & Security Limited | Public administration | 2022 |
| Fitz Holdings Limited | Financial services | 2020 |
| Fitzclarence House Freehold Limited | Real estate | 2018 |
| Fitzclarence House RTM Company Limited | Households | 2020 |
| Fitzsimons & SON Limited | Transport & logistics | 2016 |
| Fitzwilliam Place Ltd | Arts & recreation | 2020 |
| Five Nano Limited | Information & communication | 2025 |
| Five Oaks Consulting Limited | Professional & scientific | 2024 |
| Five Trees Dorset Ltd | Hospitality | 2024 |
| FKA Enterprise Ltd | Other services | 2023 |
| Flamin Cheetos Ltd | Construction | 2026 |
| Flawless Services Ltd | Administrative & support | 2022 |
| Flex Gym Health & Leisure Limited | Arts & recreation | 2013 |
| Flourish Arts Network CIC | Arts & recreation | 2025 |
| Flourish Resources Group Limited | Wholesale & retail | 2017 |
| Flow State Office Ltd | Public administration | 2022 |
| Flowers Scaffolding Ltd | Construction | 2021 |
| Flowing Digits Limited | Administrative & support | 2013 |
| FM Walsh Consultancy Ltd | Health & social care | 2022 |
| FOG Whip Limited | Information & communication | 2018 |
| Folgen Services Ltd | Information & communication | 2017 |
| Fontof Limited | Information & communication | 2015 |
| Food Rules Limited | Hospitality | 2012 |
| Football Law Associates Ltd | Professional & scientific | 2014 |
| Footsteps to Health Company Limited | Health & social care | 2022 |
| FOR Food Only Ltd | Hospitality | 2025 |
| Ford Counselling Services Limited | Other services | 2003 |
| Foreright Ltd | Construction | 2026 |
| Forest Construction East Ltd | Real estate | 2022 |
| Forest Homesteads CIC | Real estate | 2024 |
| Forever Young Aesthetics Essex Limited | Other services | 2024 |
| Forge Cleaning Group Ltd | Administrative & support | 2025 |
| Forint Finance Ltd | Wholesale & retail | 2021 |
| Form Completions Limited | Professional & scientific | 2014 |
| Formulate Change Ltd | Professional & scientific | 2011 |
| Fortress Arms Ltd | Wholesale & retail | 2026 |
| Fortuna RE Limited | Financial services | 2014 |
| Forum (NO 2) Limited | Real estate | 2002 |
| Forum Challows Limited | Construction | 2005 |
| Forum Group Limited | Real estate | 1999 |
| Foundation Properties Ltd | Administrative & support | 2014 |
| Four MAU Property Ltd | Real estate | 2021 |
| Foursquare Homes Ltd | Real estate | 2021 |
| FOX and Braces Ltd | Administrative & support | 2017 |
| FOX Conversions Limited | Construction | 2014 |
| FOX Interpreting Limited | Health & social care | 2014 |
| Foxwell Services Ltd | Construction | 2018 |
| Francesca's Flowers Ltd | Wholesale & retail | 2024 |
| Franklin Real Estate Ltd | Administrative & support | 2013 |
| Franmanage Ltd | Professional & scientific | 2026 |
| Frasers Battlesbridge Ltd | Hospitality | 2023 |
| Freelance Aviation Limited | Transport & logistics | 2009 |