| Finaura Payments Ltd | Financial services | 2021 |
| Finchsheer Limited | Real estate | 1984 |
| Find & Scale Ltd | Professional & scientific | 2026 |
| Find a Way by LC Ltd | Arts & recreation | 2025 |
| Find Carers Limited | Information & communication | 2023 |
| Find ME the Leads Limited | Administrative & support | 2018 |
| Find on Flow LLP | | 2021 |
| Find on Flow UK Ltd | Information & communication | 2021 |
| Find Your Brave Ltd | Professional & scientific | 2022 |
| Find Your Fabulous Limited | Other services | 2017 |
| Finden Business Finance Limited | Financial services | 2017 |
| Findit Fixit Leak Detection Ltd | Construction | 2025 |
| Findray Limited | Health & social care | 1989 |
| Findx Ltd | Information & communication | 2023 |
| Fine & Dandy Ltd | Arts & recreation | 2017 |
| Fine Finish Contracts Limited | Manufacturing | 2002 |
| Fine Focus Services Ltd | Construction | 2025 |
| Fine Line Strategies Ltd | Administrative & support | 2026 |
| Fineline Decorators Limited | Construction | 2019 |
| Fineline Market Research Ltd | Professional & scientific | 2014 |
| Finelook Limited | Construction | 1984 |
| Fineprint (Nottingham) Limited | Manufacturing | 1986 |
| Finer Landscapes Limited | Administrative & support | 2024 |
| Finessing Motors Ltd | Wholesale & retail | 2017 |
| Finest Way Property Investment Limited | Real estate | 2022 |
| Fingertrix @ Shipley Limited | Other services | 2008 |
| Fingertrix Hair and Beauty Limited | Other services | 2012 |
| Finishing Touch Drycleaning Limited | Administrative & support | 2003 |
| Finlake Limited | Professional & scientific | 2021 |
| Finn Alexander Limited | Information & communication | 2012 |
| Finnis UK Ltd | Professional & scientific | 2016 |
| Finovo Ltd | Professional & scientific | 2025 |
| Finq Limited | Professional & scientific | 2024 |
| Finspark Technologies Ltd | Information & communication | 2025 |
| Fintech Dynamics Limited | Information & communication | 2025 |
| Fintop Financial Services Limited | Professional & scientific | 2026 |
| Fiona Harrison Architect Ltd | Construction | 2013 |
| Fiona Heron Limited | Arts & recreation | 2008 |
| Fiona Marquick Design Ltd | Manufacturing | 2020 |
| Fiori's Finds Ltd | Wholesale & retail | 2026 |
| FIR Property Ltd | Real estate | 2022 |
| FIR Tree Farm Properties Limited | Real estate | 2021 |
| FIR Tree Timber Limited | Wholesale & retail | 2019 |
| Firasa Ltd | Wholesale & retail | 2020 |
| Firaya Limited | Information & communication | 2020 |
| Firber Engineering Limited | Manufacturing | 1968 |
| Fircroft Textiles Limited | Administrative & support | 2017 |
| Fire & Ice Ripley Limited | Other services | 2024 |
| Fire Consultancy Specialists Ltd | Other services | 2020 |
| Fire Grill Ltd | Hospitality | 2026 |
| Fire Risk Assessments Employee Trustee Limited | Extraterritorial | 2023 |
| Fire Stoppers Limited | Manufacturing | 2016 |
| Fire Tape Adhesive UK Ltd | Manufacturing | 2021 |
| Fire Window Limited | Manufacturing | 2020 |
| Fireaway Peterborough Ltd | Hospitality | 2026 |
| Firechain Limited | Wholesale & retail | 2016 |
| Firecom Systems Limited | Public administration | 2006 |
| Fired UP Stoves Ltd | Construction | 2025 |
| Firedean Limited | Professional & scientific | 1985 |
| Firefly Online Limited | Information & communication | 2008 |
| Firefly Wedding Studios Ltd | Information & communication | 2024 |
| Firenze Bidco Ltd | Financial services | 2020 |
| Firenze Bidco One Ltd | Financial services | 2020 |
| Firenze Holdco Ltd | Financial services | 2020 |
| Fireoak Enterprises Limited | Manufacturing | 2006 |
| Fireoak Holdings Limited | Financial services | 2019 |
| Firesurv Ltd | Public administration | 2019 |
| Firetop Mountain Limited | Wholesale & retail | 2001 |
| Firetracer Suppression Limited | Professional & scientific | 1992 |
| Firma Risk Services Limited | Financial services | 2021 |
| Firmager Funeral Service Limited | Extraterritorial | 2000 |
| Firmbureau Limited | Information & communication | 1987 |
| Firmcrete Limited | Construction | 2008 |
| Firme.Uk Ltd | Professional & scientific | 2019 |
| Firmin Way Management Company Limited | Households | 2021 |
| Firoz&Sons Ltd | Wholesale & retail | 2020 |
| Firoza Ltd | Information & communication | 2021 |
| First & Last Creative Studios Ltd | Arts & recreation | 2025 |
| First Advantage Europe Ltd | Administrative & support | 1997 |
| First Bridge Properties Ltd | Real estate | 2026 |
| First Carton Group Ltd | Financial services | 1997 |
| First Carton Thyne Ltd | Extraterritorial | 1938 |
| First Catering Distribution Ltd | Wholesale & retail | 2023 |
| First Choice Electrical Services Limited Limited | Construction | 2019 |
| First Choice Healthcare Ltd | Health & social care | 2018 |
| First Choice Nanny Agency Limited | Other services | 2007 |
| First Choice Play Centres Limited | Other services | 2011 |
| First Class Cleaning TD Ltd | Administrative & support | 2024 |
| First Class Trading Ltd | Hospitality | 2017 |
| First Class Worldwide Limited | Arts & recreation | 2012 |
| First Cliq Technologies Limited | Extraterritorial | 2025 |
| First Dental Limited | Construction | 1951 |
| First Enterprise Business Agency | Administrative & support | 1993 |
| First Fixation Ltd | Information & communication | 2020 |
| First for Extraction Ltd | Manufacturing | 2011 |
| First Growth Properties Limited | Professional & scientific | 2020 |
| First Healthcare Services Ltd | Health & social care | 2019 |
| First Line Student Services Ltd | Administrative & support | 2022 |
| First Love Music Limited | Information & communication | 2013 |
| First Mile Technologies Ltd | Professional & scientific | 2023 |