| FHT Haulage Limited | Transport & logistics | 2024 |
| Fi-Tech Europe Limited | Professional & scientific | 1991 |
| Fibre Harvest Limited | Manufacturing | 2006 |
| FIBRE2BLOW Limited | Information & communication | 2023 |
| Fibreglass Insulations Limited | Extraterritorial | 2001 |
| Fidavid Healthcare Ltd | Health & social care | 2025 |
| Fidavid Motors Ltd | Wholesale & retail | 2026 |
| Fidelity Art Limited | Wholesale & retail | 2010 |
| Fidelity Forecasting Limited | Administrative & support | 2020 |
| Fidens Press Ltd | Information & communication | 2025 |
| Field Blends Ltd | Wholesale & retail | 2023 |
| Field Cycles Limited | Manufacturing | 2014 |
| Field Heritage Ltd | Real estate | 2023 |
| Field Music Limited | Arts & recreation | 2005 |
| Field Service CRM Ltd | Information & communication | 2010 |
| Field-Brook Consulting Limited | Professional & scientific | 2025 |
| Fieldcraft Group LLP | | 2025 |
| Fielder+Smith Ltd | Professional & scientific | 2021 |
| Fieldhead Road Flats Management Company Limited | Households | 2001 |
| Fielding Risk Services Limited | Financial services | 2016 |
| Fieldrose Limited | Hospitality | 1992 |
| Fields Flowers Limited | Wholesale & retail | 2021 |
| Fieldshaw 2017 Limited | Administrative & support | 2017 |
| Fieldsy Properties Ltd | Real estate | 2023 |
| Fierce Panda Records Ltd | Administrative & support | 1998 |
| Fiero Limited | Hospitality | 2018 |
| Fifteen Photography Limited | Professional & scientific | 2016 |
| Fifteen Reds Holdings Limited | Financial services | 2024 |
| Fifteen Reds Limited | Arts & recreation | 2024 |
| Fifteen Reds Venues Limited | Real estate | 2024 |
| Fifteen-Thirty Group Ltd | Financial services | 2025 |
| Fifth ARC Ltd | Professional & scientific | 2025 |
| FIFTY6 Developments Ltd | Construction | 2025 |
| Figaro Originals Ltd | Professional & scientific | 2019 |
| Fight Within CIC | Health & social care | 2023 |
| Fight Zone Media Ltd | Arts & recreation | 2019 |
| Fightersphysique Ltd | Education | 2025 |
| Figtree House Management Company Limited | Administrative & support | 2015 |
| Figueira DS Ltd | Information & communication | 2025 |
| Figurebygurleen Ltd | Arts & recreation | 2021 |
| FIGURESK8 Ltd | Wholesale & retail | 2016 |
| Figuro Design Limited | Construction | 2014 |
| Filey Bay Direct Ltd | Hospitality | 2021 |
| Filippos (FLP) Limited | Construction | 2024 |
| Fill My Diary Trades Ltd | Construction | 2026 |
| Film & TV Accounts Ltd | Information & communication | 2014 |
| Film Camera Store Limited | Wholesale & retail | 2021 |
| Filmcraft Limited | Arts & recreation | 1994 |
| Filmfam CIC | Professional & scientific | 2025 |
| Fimbly Ltd | Information & communication | 2023 |
| FIN Moda Limited | Wholesale & retail | 2007 |
| Finale Guitar Limited | Wholesale & retail | 2023 |
| Finale Music School Limited | Education | 2023 |
| Finalkurt Studios Ltd | Administrative & support | 2022 |
| FINANCE4FUTURES CIC | Education | 2026 |
| Financial Inclusion Services (Yorkshire) Ltd | Information & communication | 2004 |
| Financial Private Clients Ltd | Financial services | 2004 |
| Finanz Technik Limited | Information & communication | 2016 |
| Find a University Ltd | Information & communication | 2001 |
| Find Narrative Ltd | Professional & scientific | 2023 |
| Findlater Enterprises Ltd | Professional & scientific | 2025 |
| Fine CNC Ltd | Administrative & support | 2017 |
| Fine Cocoa Ltd | Wholesale & retail | 2025 |
| Fine Edge Machine Knives Ltd | Wholesale & retail | 2011 |
| Fine Finish Decor Ltd | Construction | 2024 |
| Fine Food & Wine Limited | Wholesale & retail | 2018 |
| Fine Kiss Ltd | Hospitality | 2014 |
| Fine Leaving Media Ltd | Information & communication | 2021 |
| Fine Sign Ltd | Manufacturing | 2019 |
| Fine Thanks Limited | Information & communication | 2017 |
| Finer Detail Decor Ltd | Construction | 2024 |
| Finesse Boats Ltd | Manufacturing | 2016 |
| Finesse Bodyworx Ltd | Wholesale & retail | 2022 |
| Finesse Property UK Ltd | Real estate | 2024 |
| Finesse Renewables Limited | Construction | 2024 |
| Fingle Holdings Limited | Administrative & support | 2017 |
| Fininns Limited | Hospitality | 2024 |
| Finishing Touch Pointing Ltd | Construction | 2017 |
| Finkle Green Ltd | Hospitality | 2020 |
| Finley Joinery Ltd | Construction | 2022 |
| Finnexia Technology Ltd | Financial services | 2016 |
| Finnxtrading Ltd | Wholesale & retail | 2025 |
| Finoptus Consulting Limited | Professional & scientific | 2018 |
| Finoptus Limited | Professional & scientific | 2018 |
| Finovex Consulting Ltd | Information & communication | 2025 |
| Finp Circle Ltd | Information & communication | 2026 |
| Fintrel Group Limited | Professional & scientific | 2025 |
| Fintrel Investment Management Limited | Professional & scientific | 2025 |
| Fintrel Limited | Professional & scientific | 2025 |
| Fintrel Private Client Limited | Professional & scientific | 2025 |
| Fiona Garden Ltd | Professional & scientific | 2021 |
| Fiona Goddard Advanced Skincare Clinic Limited | Other services | 2015 |
| FIR Tree Installations Limited | Construction | 2020 |
| Firanova Ltd | Wholesale & retail | 2025 |
| Fire & Blood Ltd | Real estate | 2025 |
| Fire and Security Drawings Limited | Administrative & support | 2014 |
| Fire Armour Electrical Limited | Construction | 2026 |
| Fire Armour Services Ltd | Construction | 2022 |
| Fire at the Disco Ltd | Arts & recreation | 2021 |
| Fire Defence Training & Consultancy (UK) Limited | Professional & scientific | 2007 |