| Faith Care Ltd | Health & social care | 2015 |
| Fallow Developments Ltd | Real estate | 2020 |
| Family Values Records Limited | Information & communication | 2020 |
| Fantastic Hair Products Ltd | Wholesale & retail | 2019 |
| Fantastic Plastic Recording Company Limited | Information & communication | 2011 |
| FAR Commercial Limited | Real estate | 2024 |
| FAR Freehold Limited | Real estate | 2024 |
| FAR Leasehold Limited | Real estate | 2024 |
| FAR Restaurants Ltd | Real estate | 2023 |
| Farfar Studio Ltd | Information & communication | 2022 |
| Farfly Media Ltd | Information & communication | 2021 |
| Farpoint Productions Ltd | Administrative & support | 2016 |
| Farrar Food Limited | Hospitality | 2025 |
| Fast and Fresh Food Ltd | Hospitality | 2022 |
| Fast Booking Ltd | Information & communication | 2015 |
| Fast Capital Limited | Information & communication | 2012 |
| Faster Cleani̇ng Servi̇ces Limited | Administrative & support | 2025 |
| Fastfix Maintenance and Construction Ltd | Construction | 2022 |
| FAT Flyers (Worthing) Limited | Other services | 2003 |
| FAT PUG Productions Limited | Information & communication | 2010 |
| Fathm Limited | Professional & scientific | 2019 |
| FAY Jones Ltd | Health & social care | 2025 |
| FB Construction Ltd | Information & communication | 2024 |
| Featuretek I.T. Limited | Information & communication | 1999 |
| Feebieair Engineering Limited | Other services | 2019 |
| Feed the Fit Ltd | Arts & recreation | 2021 |
| Feedo.Uk Sweets Limited | Hospitality | 2024 |
| Feher Biborka Ltd | Professional & scientific | 2024 |
| Felce & GUY Partnership LLP | | 2005 |
| Felicio Properties Limited | Real estate | 2026 |
| Felix Consultancy Limited | Professional & scientific | 2021 |
| Felix Court RTM Company Limited | Extraterritorial | 2023 |
| Female Perspective Ltd | Professional & scientific | 2018 |
| Fenna & Freddie Ltd | Professional & scientific | 2023 |
| Fennec Assets Limited | Administrative & support | 2026 |
| Fenway Limited | Professional & scientific | 2016 |
| Ferguson Law Limited | Health & social care | 2022 |
| Fermers Ltd | Real estate | 2025 |
| Fern Road Ltd | Construction | 2020 |
| Fern Road Management Ltd | Households | 2020 |
| Fernandos Bar & Grill Ltd | Hospitality | 2016 |
| Fernglen Advisory Limited | Professional & scientific | 2022 |
| Fernhurst Consulting Ltd | Information & communication | 2011 |
| Fernleigh Chichester Ltd | Other services | 2020 |
| Fernweh Health and Wellness Ltd | Health & social care | 2024 |
| Feruge Ltd | Extraterritorial | 2023 |
| Fetter Lane Restaurant Ltd | Hospitality | 2020 |
| Fforde Building Services Limited | Construction | 2015 |
| FH Mgmt Limited | Households | 2004 |
| FHT Holdings Limited | Health & social care | 2023 |
| FIA Jacobs Ltd | Wholesale & retail | 2025 |
| Fialex Properties Limited | Real estate | 2022 |
| FID Investments Limited | Real estate | 2021 |
| Fidget and Spin Ltd | Arts & recreation | 2025 |
| Fields Garage (Brighton) Limited | Wholesale & retail | 1955 |
| Fieldwatch Properties Limited | Real estate | 2004 |
| Fiena Limited | Health & social care | 2018 |
| Fiery Flying Films Limited | Information & communication | 2015 |
| Fifteen York Road Limited | Real estate | 1997 |
| Fifty-Five Norton Road Hove Limited | Households | 1989 |
| Figjam Limited | Hospitality | 2014 |
| Fiji Property Ltd | Real estate | 2021 |
| Filament Post Production Ltd | Information & communication | 2011 |
| Fileman Antiques Limited | Other services | 2013 |
| Filetest Limited | Extraterritorial | 2000 |
| Filth Records Ltd | Information & communication | 2026 |
| FIN Network Ltd | Information & communication | 2018 |
| Finance Therapy Ltd | Professional & scientific | 2022 |
| Financial Link Investments Ltd | Real estate | 2022 |
| Finch Court Management Company Limited | Households | 2003 |
| Fincham Commercial Decorating Ltd | Construction | 2015 |
| Find Your Spark Ltd | Professional & scientific | 2024 |
| Fine to Fabulous Ltd | Other services | 2024 |
| Finesse Atlantic Ltd | Arts & recreation | 2024 |
| Finestone Contracts Limited | Wholesale & retail | 2005 |
| Finewood Marketing (U.K.) Ltd. | Administrative & support | 1993 |
| Finewood Marketing Ltd. | Administrative & support | 1998 |
| Finid Finance Ltd | Financial services | 2023 |
| Finn Digital Media Ltd | Professional & scientific | 2022 |
| Finn's Vape Store Limited | Wholesale & retail | 2018 |
| Finns Medical Limited | Health & social care | 2016 |
| Finsdale Ltd | Real estate | 2022 |
| Fiona Brooke Limited | Information & communication | 2014 |
| Fiona Bugler Content & Communications Ltd | Professional & scientific | 2005 |
| Fiona's Diggidy Daycare Ltd | Other services | 2017 |
| Firefly Electrics Ltd | Construction | 2024 |
| Firefly Events & Concierge Ltd | Administrative & support | 2018 |
| Fireodds Media Limited | Professional & scientific | 2016 |
| Firestar Holdings Ltd | Real estate | 2022 |
| Firestone Pictures Ltd | Education | 2014 |
| First Call Property Limited | Real estate | 1998 |
| First Format Building Services Limited | Construction | 2002 |
| First Line Mental Health Limited | Health & social care | 2017 |
| First Union Building Co. Limited | Administrative & support | 2004 |
| Firstfix Maintenance & Construction Ltd | Construction | 2026 |
| Fish and Bricks Limited | Hospitality | 2018 |
| Fish Galore (Retail) Ltd | Wholesale & retail | 2016 |
| Fish Galore Investments Ltd | Real estate | 2019 |
| Fish Galore Limited | Wholesale & retail | 2005 |
| Fisher Construction & Remodelling Ltd | Construction | 2005 |