| Fieldhouse Inn Ltd | Hospitality | 2018 |
| Fieldhouse Riding Equipment Limited | Wholesale & retail | 1981 |
| Fields Fish Bar Ltd | Hospitality | 2021 |
| Fifteen Seven Event Limited | Hospitality | 2023 |
| Fill GAS Ltd | Other services | 2026 |
| Fillets Takeaway (Sleaford) Ltd | Hospitality | 2008 |
| Filmate Video Production Limited | Information & communication | 2019 |
| Filmnet Ltd | Information & communication | 2026 |
| Filterserve Limited | Professional & scientific | 1999 |
| Finance Box Consultancy (UK) Limited | Professional & scientific | 2022 |
| Finch Property Services Ltd | Construction | 2025 |
| Finch's Finest Restorations and Repairs Limited | Construction | 2025 |
| Fine Touch Decorators Ltd | Construction | 2026 |
| Finesse Landscaping Ltd | Administrative & support | 2022 |
| Finesse Paints Ltd | Construction | 2020 |
| Finest Mortgage Solutions Ltd | Financial services | 2021 |
| Finestmove Limited | Real estate | 2022 |
| Finn TK Limited | Real estate | 2022 |
| Fintech AI Fusion Ltd | Wholesale & retail | 2025 |
| Firaki Limited | Wholesale & retail | 2018 |
| Fire Door Certification Limited | Construction | 2016 |
| Firebird Firewalks Limited | Arts & recreation | 2025 |
| Firecheck Services (UK) Limited | Professional & scientific | 2013 |
| Fired UP Theatre Company Limited | Arts & recreation | 2006 |
| Firetyre Limited | Wholesale & retail | 2025 |
| First Alert GAS & Plumbing Ltd | Construction | 2022 |
| First Choice Living Ltd | Hospitality | 2020 |
| First Choice Locums Limited | Administrative & support | 2012 |
| First Class Cricket Academy Limited | Education | 2012 |
| First Class Cricket Tours Limited | Education | 2012 |
| First Class Salons Limited | Other services | 2024 |
| First Holdings Limited | Financial services | 2016 |
| First Image Cleaning Consultants Limited | Administrative & support | 2017 |
| First Managed Services Limited | Administrative & support | 2005 |
| First Orchard Limited | Financial services | 2013 |
| First Outsourcing Limited | Administrative & support | 2007 |
| First Personnel Group Limited | Administrative & support | 1994 |
| First Personnel Limited | Other services | 1989 |
| First Premium Direct Limited | Financial services | 2014 |
| First Recruiting Ltd | Administrative & support | 2021 |
| First Secure Limited | Administrative & support | 2022 |
| First Start Properties Limited | Real estate | 2017 |
| First Step Housing Association | Hospitality | 2010 |
| First Step Mortgages Ltd | Financial services | 2020 |
| First Stop Autos Ltd | Wholesale & retail | 2026 |
| First Stop Mortgage Shop Limited | Financial services | 1998 |
| First Tier Properties (UK) Ltd | Real estate | 2017 |
| First Tier Visas UK Ltd | Professional & scientific | 2023 |
| Fiscal Associates UK Limited | Professional & scientific | 2009 |
| Fischer Engineering Products (UK) Ltd | Manufacturing | 2012 |
| Fisher and Daughters Homes Ltd | Construction | 2024 |
| Fisher Carpentry Holdings Ltd | Financial services | 2025 |
| Fisher Carpentry Limited | Construction | 2003 |
| Fisher Leak Automation Limited | Manufacturing | 2006 |
| Fisher Leak Group Limited | Financial services | 2007 |
| Fisher Leak Systems Limited | Manufacturing | 1999 |
| Fishley Court Management Company Limited | Hospitality | 2006 |
| Fitch Autos Limited | Wholesale & retail | 2007 |
| Fitfam Ltd | Wholesale & retail | 2022 |
| Fitfood Meal Prep Ltd | Manufacturing | 2019 |
| Fitovate Limited | Financial services | 2022 |
| Five Limes Property Ltd | Real estate | 2024 |
| Five Star Catering (Walsall) Limited | Hospitality | 2023 |
| Five Star Community Centre Limited | Hospitality | 2019 |
| Five Star Day Centre Ltd | Health & social care | 2018 |
| Five Star Legal Limited | Professional & scientific | 2017 |
| Five Star Support Limited | Health & social care | 2015 |
| Five Stars Trans Ltd | Transport & logistics | 2019 |
| FIX the Meal Ltd | Health & social care | 2025 |
| Fixit Insulation Ltd | Construction | 2025 |
| FIZ Property Cleaning Ltd | Administrative & support | 2026 |
| Fizzy Global Services Limited | Administrative & support | 2021 |
| Fjmu UK Alumni CIC | Education | 2026 |
| FJS Property Clearance Limited | Transport & logistics | 2019 |
| FK Trading Ltd | Wholesale & retail | 2025 |
| Flagship Interiors Ltd | Professional & scientific | 2019 |
| Flair Models Limited | Manufacturing | 2005 |
| Flame HUT Walsall Ltd | Hospitality | 2023 |
| Flamecrust Ltd | Hospitality | 2026 |
| Flash PAY Payment Solutions Ltd | Real estate | 2019 |
| Flashfit Ltd | Wholesale & retail | 2021 |
| Flat White Games Ltd | Information & communication | 2025 |
| Flavoree Ltd | Wholesale & retail | 2025 |
| Fleet Alignment Services Limited | Wholesale & retail | 2024 |
| Fleet Inc Limited | Wholesale & retail | 2013 |
| Fleetfuse Ltd | Transport & logistics | 2026 |
| Fleetora Ltd | Administrative & support | 2026 |
| Fleetstar Transport Limited | Transport & logistics | 2026 |
| Fleming Consultancy Ltd | Other services | 2026 |
| Fletchers Cake Studio Limited | Hospitality | 2002 |
| Flex to Sleep Ltd | Manufacturing | 2017 |
| Flicker of Light Ltd | Wholesale & retail | 2026 |
| Flmg-Medical Ltd | Health & social care | 2021 |
| FLO Law Consultants Ltd | Real estate | 2025 |
| FLO Maintenance Limited | Administrative & support | 2005 |
| Floors R Yours Ltd | Wholesale & retail | 2025 |
| Floorstak Limited | Other services | 2017 |
| Flopeace Company Ltd | Health & social care | 2023 |
| Flora Investments Ltd | Real estate | 2017 |
| Florist House Limited | Wholesale & retail | 2021 |