| Fine Italian Dining Limited | Hospitality | 2026 |
| Fine Physics Limited | Professional & scientific | 2023 |
| Fine Structural Designs Ltd | Professional & scientific | 2020 |
| Fine Touch Beauty Tool Ltd | Wholesale & retail | 2025 |
| Finecal Environmental Systems Limited | Other services | 1979 |
| Finecal Group Limited | Wholesale & retail | 1975 |
| Finecal Labels Limited | Manufacturing | 2024 |
| Finedon SL Limited | Construction | 2021 |
| Finelead Limited | Professional & scientific | 2018 |
| Fineline Lighting Limited | Administrative & support | 2010 |
| Fineline Limited | Manufacturing | 2007 |
| Finesse Blinds & Installations Ltd | Wholesale & retail | 2024 |
| Finesse Consultancy Limited | Professional & scientific | 2017 |
| Finest Electrical Limited | Construction | 2021 |
| Finest Oils Ltd | Wholesale & retail | 2020 |
| Fineworks (South West) Limited | Administrative & support | 2005 |
| Finiscope Group Limited | Professional & scientific | 2019 |
| Finlay Hire Limited | Administrative & support | 1992 |
| Finlay Plant (Northern) Limited | Wholesale & retail | 1992 |
| Finlay Plant (Southern) Limited | Administrative & support | 1992 |
| Finlay Plant (UK) Limited | Professional & scientific | 2007 |
| Finlay Plant S.W. Limited | Wholesale & retail | 1998 |
| Finlay Plant Sales Limited | Wholesale & retail | 2005 |
| Finlight DG UK Ltd | Energy | 2023 |
| Finlink Ltd | Administrative & support | 2020 |
| Finmac Capital Ltd | Professional & scientific | 2022 |
| Finmark Properties Limited | Real estate | 2022 |
| Finn Consulting South Limited | Real estate | 2024 |
| Finnix Properties Ltd | Real estate | 2020 |
| Finqle UK Ltd | Professional & scientific | 2022 |
| Finres Limited | Real estate | 1990 |
| Finssist Limited | Information & communication | 2024 |
| Finswimming UK LLP | | 2017 |
| Fintech Construction Ltd | Construction | 2022 |
| Fintech South Ltd | Other services | 2024 |
| Fintech West Ltd | Administrative & support | 2018 |
| Fintra Apparel Ltd | Wholesale & retail | 2025 |
| Finucane Consulting Ltd | Professional & scientific | 2021 |
| Finvestable Ltd | Professional & scientific | 2026 |
| Finvexa Ltd | Information & communication | 2026 |
| Finvora Ltd | Wholesale & retail | 2025 |
| Finzuler Ltd | Extraterritorial | 2008 |
| Fiona Powley Change Coach Ltd | Professional & scientific | 2021 |
| Fiora Limited | Information & communication | 2005 |
| Fipelwa Ltd | Health & social care | 2021 |
| FIR Farm Holdings Limited | Agriculture & fishing | 2012 |
| FIR Farm Limited | Agriculture & fishing | 2021 |
| FIR Tree Lodge Limited | Hospitality | 2015 |
| FIR Tree Paving Limited | Hospitality | 2011 |
| Fira Landscape Practice Limited | Professional & scientific | 2007 |
| Fira Pastry&Cakes Ltd | Wholesale & retail | 2022 |
| Firdy Consultancy Services Ltd | Professional & scientific | 2021 |
| Fire & Furnish Limited | Wholesale & retail | 2021 |
| Fire & Light Consultancy Limited | Administrative & support | 2025 |
| Fire & Safety Training Ltd | Other services | 2012 |
| Fire and Flood Property Restoration Ltd | Construction | 2023 |
| Fire Consultant Ltd | Professional & scientific | 2016 |
| Fire Damper Testing Ltd | Wholesale & retail | 2023 |
| Fire Design Paris Limited | Arts & recreation | 2002 |
| Fire Door Direct Ltd | Manufacturing | 2020 |
| Fire Immunity Group Ltd | Financial services | 2022 |
| Fire Immunity Ltd | Public administration | 2019 |
| Fire Safety & Compliance Ltd | Professional & scientific | 2022 |
| Firebee Ltd | Manufacturing | 2009 |
| Firebird Theatre | Arts & recreation | 2006 |
| Firecheck Manufacturing Limited | Manufacturing | 2023 |
| Firecove Ltd | Information & communication | 2025 |
| Firefly Creative Limited | Professional & scientific | 2023 |
| Firefly Green Fuels Limited | Manufacturing | 2022 |
| Firefly Tutoring Limited | Education | 2024 |
| Firehaus Ltd | Professional & scientific | 2019 |
| Fireside Fundraising Ltd | Professional & scientific | 2022 |
| Firestopsouthwest Ltd | Public administration | 2025 |
| Fireteach Ltd | Other services | 2023 |
| Firewok Ltd. | Manufacturing | 2011 |
| Firewood Store UK Ltd | Wholesale & retail | 2025 |
| Firleaze Consulting Limited | Professional & scientific | 2024 |
| Firleaze LLP | | 2012 |
| Firm Foundations Bristol Limited | Construction | 2014 |
| Firm Solutions Limited | Professional & scientific | 2026 |
| Firmer Derma Ltd | Other services | 2014 |
| Firmstone Consortia One Limited | Real estate | 2017 |
| Firmstone Consortia Two Limited | Real estate | 2018 |
| Firmstone Developments Limited | Construction | 2007 |
| Firmstone UK LLP | | 2008 |
| Firmtrade Home Improvements Ltd | Construction | 2026 |
| First 4 Pools Ltd | Construction | 2013 |
| First AID Education Ltd | Education | 2016 |
| First AID Training (Bath) Limited | Education | 2016 |
| First AID Training Bristol Limited | Education | 2018 |
| First Alert (Double Glazing) Limited | Manufacturing | 2000 |
| First Assured Ltd | Information & communication | 2026 |
| First Auto Care Techs Ltd | Wholesale & retail | 2018 |
| First British Revivals Limited | Wholesale & retail | 2017 |
| First Call Financials (SW) Limited | Professional & scientific | 2013 |
| First Call Flooring Limited | Construction | 2019 |
| First Care HH Limited | Health & social care | 2025 |
| First Choice Mechanics Limited | Wholesale & retail | 2006 |
| First Class (Bristol) Limited | Other services | 2003 |
| First Class Care Limited | Health & social care | 2010 |