| First Step Children Nurseries Limited | Education | 2007 |
| First Touch Limited | Construction | 2024 |
| First Word Records Limited | Information & communication | 2004 |
| FIRST2PAY Technologies Limited | Information & communication | 2021 |
| Fiscalflow Solutions Ltd | Professional & scientific | 2025 |
| Fish N Chips Ltd | Hospitality | 2012 |
| Fishy Delishy Waltham Cross Limited | Hospitality | 2019 |
| Fit-Ag Scooters Limited | Wholesale & retail | 2021 |
| FIX a Leak Plumber Ltd | Construction | 2022 |
| Fixologi Ltd | Construction | 2022 |
| Fiyin & Grandma (Event) Rentals Ltd | Administrative & support | 2023 |
| Flamingorgeous Ltd | Manufacturing | 2023 |
| Flannan James Limited | Manufacturing | 2021 |
| Flawless Professional Cleaning SVS Limited | Administrative & support | 2018 |
| FLB Consult Limited | Professional & scientific | 2020 |
| Flex Taxis Limited | Transport & logistics | 2017 |
| Flexmire Ltd | Wholesale & retail | 2022 |
| Flightdeck Limited | Other services | 2025 |
| Flightpath Training Limited | Other services | 2016 |
| Flint Building Solutions Ltd | Construction | 2018 |
| Flippin Love Ltd | Construction | 2023 |
| Flooring Imports Limited | Construction | 2013 |
| Floral Fantasy Ltd | Wholesale & retail | 2025 |
| Flying Anvil Ltd | Information & communication | 2011 |
| Flying Colours (Textiles) Limited | Manufacturing | 2007 |
| Flysunways Limited | Administrative & support | 2020 |
| FM Blinds Limited | Wholesale & retail | 2023 |
| FMK Decor Ltd | Construction | 2022 |
| FNC Haulage Limited | Transport & logistics | 2018 |
| Focus Events Xtra Ltd | Hospitality | 2023 |
| Fodel Investments Limited | Real estate | 2025 |
| Fola's Bakery Ltd | Wholesale & retail | 2020 |
| Fonebox Limited | Manufacturing | 2010 |
| Food Connextions International Ltd | Hospitality | 2012 |
| Foodart Direct Ltd | Wholesale & retail | 2020 |
| FOR Frocks Sake Ltd | Wholesale & retail | 2025 |
| Ford Rhodes Accountants Limited | Professional & scientific | 2012 |
| Forden Healthcare Limited | Public administration | 2023 |
| Forest Therapy Centre Limited | Health & social care | 2015 |
| Forever Clean Commercial Limited | Administrative & support | 2008 |
| Forexflow Limited | Financial services | 2017 |
| Formula X Racing Limited | Arts & recreation | 2025 |
| Fortune Business Services Limited | Wholesale & retail | 2014 |
| Fortune HAA Limited | Real estate | 2019 |
| Forward Thinking Therapy Limited | Health & social care | 2021 |
| Four Seasons Luxury Transport Hire Limited | Transport & logistics | 2024 |
| Fourco Ltd | Wholesale & retail | 2003 |
| Fourways Plant Limited | Construction | 1983 |
| Fourways Scaffolding Limited | Professional & scientific | 2006 |
| Fowley Mead Park Limited | Hospitality | 1963 |
| Foxwood Green Management Company Limited | Real estate | 1995 |
| Foxy Girl Ltd | Wholesale & retail | 2019 |
| FP Mailing (West END) Ltd | Administrative & support | 2023 |
| FP Maintenance & Decorating Ltd | Professional & scientific | 2026 |
| FP Maintenance Services Ltd | Professional & scientific | 2024 |
| FPV Training Limited | Other services | 2016 |
| Frances Ekiko Ltd | Information & communication | 2017 |
| Frank's HGV Ltd | Construction | 2025 |
| Franklyn Services Limited | Manufacturing | 2017 |
| Fratelli Barber Studio Ltd | Other services | 2022 |
| Freche Property Management Ltd | Real estate | 2026 |
| Free Your Demons Limited | Wholesale & retail | 2023 |
| Frenzic Games Ltd | Information & communication | 2026 |
| Fresh & Clean Co Solutions Ltd | Administrative & support | 2019 |
| Fresh Juice Interactive Limited | Information & communication | 2017 |
| Freshstart Cleaning Experts Limited | Administrative & support | 2025 |
| Freshview Blinds Ltd | Professional & scientific | 2019 |
| Freshwayuk Ltd | Wholesale & retail | 2022 |
| Freya Liiv Finance Limited | Professional & scientific | 2023 |
| Friern Place Management Company Limited | Households | 2003 |
| Frootco Ltd | Wholesale & retail | 2023 |
| Fruitable UK Limited | Wholesale & retail | 2026 |
| FS Investments Limited | Extraterritorial | 2015 |
| Ftoni Construction Limited | Construction | 2021 |
| FTP Digital Limited | Professional & scientific | 2024 |
| Fuel Measuring Solutions Limited | Manufacturing | 2025 |
| Full GAS Plumbing and Heating Ltd | Construction | 2016 |
| Full Refurb Limited | Construction | 2015 |
| Funkyfish Entertainment Ltd | Arts & recreation | 2017 |
| Furkii Limited | Transport & logistics | 2026 |
| Fusefix Limited | Construction | 2017 |
| Fusion Management Company (Ware) Limited | Households | 2008 |
| Futura Homes (West Cheshunt) Ltd | Construction | 2026 |
| Future-Fit Foundation | Professional & scientific | 2013 |
| Future-Fit Ltd | Information & communication | 2018 |
| G & L Brickwork Limited | Construction | 2005 |
| G a Burt Property Management Limited | Real estate | 2022 |
| G and Y Creative Limited | Professional & scientific | 2025 |
| G B Heating & Plumbing Limited | Construction | 2017 |
| G K Property Services Ltd | Real estate | 2011 |
| G R Macas Limited | Other services | 2015 |
| G S B Resourcing Limited | Administrative & support | 2010 |
| G SEC Group Limited | Administrative & support | 2025 |
| G&B Construction London Ltd | Construction | 2018 |
| G&G Property Holdings Limited | Real estate | 2021 |
| G. Fruit&Veg Ltd | Wholesale & retail | 2019 |
| G.B Building Maintenance Ltd | Construction | 2025 |
| G.E.O.P.A.R Ltd | Administrative & support | 2025 |
| G.Laz. Services (UK) Limited | Other services | 2019 |
| G10 Holdings Limited | Financial services | 2025 |