| Fibres Workshop Limited | Manufacturing | 2025 |
| Fibulna Property Services Ltd | Real estate | 2024 |
| Fictitious Capital Limited | Manufacturing | 2011 |
| Ficurso Limited | Real estate | 2025 |
| Fidans Cafe Ltd | Hospitality | 2018 |
| Fidelis Accountancy and Taxation Services Ltd | Professional & scientific | 2017 |
| Fidon Services Limited | Health & social care | 2025 |
| Fidor Consultancy Limited | Professional & scientific | 2026 |
| Fidra Piping Engineering Ltd | Professional & scientific | 2020 |
| Field Energy Services Ltd | Mining & quarrying | 2021 |
| Field Lane Garage Ltd | Wholesale & retail | 2026 |
| Field Lane Management Co. Limited | Real estate | 2004 |
| Fieldcross Properties Limited | Real estate | 1998 |
| Fielder & RAO Ltd | Real estate | 2020 |
| Fielding Ambrose SA Limited | Real estate | 2026 |
| Fielding Property Group Limited | Real estate | 2024 |
| Fields Developments Ltd | Construction | 2025 |
| Fields Joinery Ltd | Construction | 2021 |
| Fields of Éire Ltd | Arts & recreation | 2025 |
| Fields Property Group (North West) Ltd | Construction | 2025 |
| Fieldstone END 2 Limited | Construction | 2026 |
| Fieldway Compliance Ltd | Construction | 2006 |
| Fieldway Construction Ltd | Construction | 2023 |
| Fieldway Consulting Ltd | Professional & scientific | 2025 |
| Fieldway Group Limited | Professional & scientific | 2018 |
| Fiercelove Design Ltd | Professional & scientific | 2017 |
| Fifteen TEN Architects Ltd | Professional & scientific | 2021 |
| Fifteen Victoria Street Management Limited | Households | 1999 |
| Fifty Four Dowhills Limited | Construction | 2023 |
| Fifty One Estates Ltd | Real estate | 2019 |
| Fiftyeight Global Limited | Professional & scientific | 2010 |
| Figh Noone Ltd | Wholesale & retail | 2025 |
| Fight Game Management Ltd | Arts & recreation | 2024 |
| Fight Industries Limited | Arts & recreation | 2010 |
| Fight Like a Girl Community Interest Company | Health & social care | 2026 |
| Fightingforfitness Limited | Arts & recreation | 2022 |
| Figura Property Investment Ltd | Real estate | 2019 |
| Filament Productions Ltd | Information & communication | 2025 |
| Filecrown Limited | Administrative & support | 1997 |
| Filesafe (Document Storage Solutions) Limited | Administrative & support | 2001 |
| Filis-Goran Ltd | Other services | 2018 |
| Film 1ST (Native) Limited | Information & communication | 2013 |
| Film MAN Ltd | Information & communication | 2022 |
| Film Solutions Bros Limited | Information & communication | 2016 |
| Filmpack Ltd | Manufacturing | 2016 |
| Films by Greg Limited | Information & communication | 2024 |
| Filorga Ltd | Construction | 2025 |
| Filter (by Molly-Mae) Ltd | Wholesale & retail | 2019 |
| Filter Bay Holdings Limited | Hospitality | 2018 |
| Filter Union Limited | Arts & recreation | 2017 |
| Fimsa Limited | Real estate | 2017 |
| Fina James Ltd | Information & communication | 2023 |
| Finaco Solutions Ltd | Professional & scientific | 2026 |
| Final Warning Ltd | Administrative & support | 2020 |
| Finalfix Structural Ltd | Construction | 2021 |
| Finance for Business Solutions Limited | Financial services | 2015 |
| Finance for Business UK Limited | Financial services | 2009 |
| Finance Partnering Services Limited | Professional & scientific | 2023 |
| Finance Services Limited | Financial services | 2006 |
| Financial Services Education Limited | Education | 2004 |
| Finbar Engineering Solutions Ltd | Professional & scientific | 2022 |
| Finbar Kent Bloodstock Limited | Agriculture & fishing | 2024 |
| Finbl Limited | Information & communication | 2026 |
| Finch Group Contracts Ltd | Professional & scientific | 2017 |
| Finchmart Ltd | Wholesale & retail | 2025 |
| Find Your Calm Sanctuary C.I.C. | Health & social care | 2021 |
| Find Your Eden Lettings Ltd | Real estate | 2022 |
| Findexiq Ltd | Financial services | 2021 |
| Finding the Music Inside Consultancy Ltd | Professional & scientific | 2025 |
| Finding the Solution CIC | Information & communication | 2025 |
| Fine Air Engineering Limited | Construction | 2011 |
| Fine Design (Liverpool) Limited | Wholesale & retail | 1999 |
| Fine Grain Productions Limited | Wholesale & retail | 2022 |
| Fine Line Clinical Cosmetics Ltd | Other services | 2017 |
| Fine Line Music Ltd | Arts & recreation | 2025 |
| Fine Surrounds Liverpool Limited | Wholesale & retail | 2022 |
| Finesse Clinical Aesthetics Ltd | Other services | 2025 |
| Finesse Locums Ltd | Wholesale & retail | 2023 |
| Finest Aquatics Holdings Limited | Financial services | 2015 |
| Finest Aquatics Ltd | Wholesale & retail | 2011 |
| Finest Fish Food Ltd | Wholesale & retail | 2012 |
| Finest Grocery Ltd | Wholesale & retail | 2025 |
| Finestone Build & Maintenance Ltd | Construction | 2011 |
| Finford Escapes Limited | Hospitality | 2026 |
| Finford Estates Limited | Real estate | 2017 |
| Finfree Ltd | Administrative & support | 2016 |
| Fingalpoint Limited | Administrative & support | 1990 |
| Finis Valor Commercial Ltd | Professional & scientific | 2023 |
| Finishcraft Ltd | Construction | 2025 |
| Finite 8 Ltd | Financial services | 2023 |
| Finley Including Lynsey & Mark Ltd | Real estate | 2020 |
| Finley JAD Properties Ltd | Real estate | 2026 |
| Finney Mclelland Ltd | Other services | 2019 |
| Finnigan and Sons Ltd | Professional & scientific | 2025 |
| Finnis Sports Ltd | Arts & recreation | 2016 |
| Finnstiff Property Company Limited | Real estate | 2019 |
| Fiona Cross Limited | Administrative & support | 2022 |
| Fiore Trans Limited | Transport & logistics | 2017 |
| Fiorie Limited | Wholesale & retail | 2025 |
| Firany U Kasi W UK Ltd | Wholesale & retail | 2023 |