| Fine Burger Catering Co Ltd | Extraterritorial | 2023 |
| Fine Care Services Ltd | Health & social care | 2023 |
| Fine Home Building Ltd | Construction | 2012 |
| Finealta Ltd | Real estate | 2021 |
| Finecut Finishing Ltd. | Manufacturing | 1989 |
| Finedge Ltd | Information & communication | 2024 |
| Finelined Limited | Wholesale & retail | 2021 |
| Finemill Limited | Financial services | 2013 |
| Fineplan Securities Limited | Wholesale & retail | 1966 |
| Finer Stays Ltd | Real estate | 2023 |
| Finergy Partners Ltd | Professional & scientific | 2014 |
| Finesse PDR Limited | Wholesale & retail | 2023 |
| Finest Punjabi Cuisine Limited | Hospitality | 2024 |
| Finfraction Ltd | Professional & scientific | 2025 |
| Finger Store Films Limited | Information & communication | 2006 |
| Finish First Production Limited | Information & communication | 2023 |
| Finite Inc Global Limited | Other services | 2018 |
| Finix Wealth Ltd | Financial services | 2026 |
| Finnegan Associates Limited | Professional & scientific | 2007 |
| Finnese Ltd | Transport & logistics | 2019 |
| Finnley Property Ltd | Real estate | 2024 |
| Finsa Holdings Limited | Financial services | 2016 |
| Finsbury Court Felixstowe Limited | Real estate | 2024 |
| Fintaxwise Accountants Ltd | Professional & scientific | 2019 |
| Fintech Maverick Ltd | Information & communication | 2024 |
| Fintract Limited | Professional & scientific | 2025 |
| Finu Carpentry Ltd | Administrative & support | 2022 |
| Finverse Tech PTE. Ltd | Information & communication | 2019 |
| Finvestify Ltd | Administrative & support | 2025 |
| Finzo Accountants Ltd | Extraterritorial | 2020 |
| Finzo Company Ltd | Professional & scientific | 2021 |
| Finzo Ltd | Professional & scientific | 2020 |
| FIR Talent Limited | Administrative & support | 2024 |
| Fire and Safety Industrial Products Limited | Wholesale & retail | 2019 |
| Fire Link Couriers and Haulage Ltd | Transport & logistics | 2024 |
| Fire Safetech Services Limited | Construction | 2017 |
| Fire Systems Services Limited | Administrative & support | 2002 |
| Fireaway Pizza Sittingbourne Limited | Hospitality | 2019 |
| Fireaway Sunbury-On-Thames Ltd | Hospitality | 2021 |
| Fireblade Ltd | Transport & logistics | 2025 |
| Firecraft West London Limited | Wholesale & retail | 2011 |
| Fireflex Limited | Manufacturing | 1948 |
| Firefly Properties Limited | Real estate | 2022 |
| Firetruck East of England Limited | Hospitality | 2026 |
| Firework Corner Ltd | Wholesale & retail | 2010 |
| Firmsure Limited | Construction | 2020 |
| First 1 2 1 Care Ltd | Other services | 2016 |
| First 4 Packaging Limited | Wholesale & retail | 2017 |
| First Charge Limited | Other services | 2019 |
| First Choice (Look & Listen) Ministry Ltd | Hospitality | 2026 |
| First Choice Premium Mechanics & Tyres Ltd | Wholesale & retail | 2022 |
| First Choice Trading Ltd | Transport & logistics | 2021 |
| First Class Beauty Academy Ltd | Education | 2025 |
| First Class Beauty Centre Ltd | Other services | 2022 |
| First Class Cleaners Direct Ltd | Administrative & support | 2021 |
| First Class Signs Ltd | Other services | 2013 |
| First Corporation Limited | Wholesale & retail | 2016 |
| First Dental Healthcare Limited | Health & social care | 2020 |
| First Empire M Ltd | Real estate | 2025 |
| First Executive Estates Limited | Real estate | 1996 |
| First Finance London Limited | Financial services | 2018 |
| First for Fuels Ltd | Other services | 2018 |
| First Fork Restro Ltd | Hospitality | 2026 |
| First Formers IT Limited | Wholesale & retail | 2021 |
| First Glass Solutions Ltd | Manufacturing | 2018 |
| First Grovelands Management Company Limited | Households | 1984 |
| First Hand Locums Limited | Health & social care | 2010 |
| First London Property Ltd | Real estate | 2014 |
| First Person Counselling Ltd | Other services | 2017 |
| First Physiotherapy Limited | Administrative & support | 2014 |
| First Project Holding Ltd | Financial services | 2025 |
| First Rate Tuition Ltd | Education | 2017 |
| First Resort International Travel Limited | Administrative & support | 1994 |
| First Step Travels Ltd | Administrative & support | 2023 |
| First Steps Infant Care Ltd | Health & social care | 2022 |
| First Take Limited | Arts & recreation | 1989 |
| First Tiles Services Ltd | Construction | 2023 |
| First Vision Solutions Limited | Administrative & support | 2008 |
| First Years PRE School Ltd | Education | 2021 |
| First@Safety Ltd | Education | 2007 |
| Firstbricks Properties Ltd | Real estate | 2024 |
| Firstcrest Limited | Real estate | 2016 |
| Firstentsol Limited | Information & communication | 2006 |
| Firstqa Systems Limited | Information & communication | 2018 |
| Firststep Care Limited | Wholesale & retail | 2008 |
| Fiscal Finserve Limited | Financial services | 2023 |
| Fish & Meat (Harrow) Limited | Wholesale & retail | 2022 |
| Fish Creek Advisory Limited | Administrative & support | 2023 |
| Fish Help Concept Ltd | Agriculture & fishing | 2024 |
| Fisher PUB Limited | Hospitality | 2023 |
| Fit & Fine Ltd | Wholesale & retail | 2024 |
| Fit Labs Kensington Limited | Arts & recreation | 2016 |
| FIT4GROWTH Limited | Professional & scientific | 2005 |
| Fitch Investments Ltd | Other services | 2019 |
| Fitmind Training CIC | Health & social care | 2020 |
| Fitness & Gadgets Ltd | Wholesale & retail | 2025 |
| Fitness Direct Ltd | Wholesale & retail | 2014 |
| Fitpa ORG Ltd | Information & communication | 2025 |
| Fitpharm Limited | Wholesale & retail | 2023 |
| Fitzbrick Brickwork Ltd | Construction | 2021 |