| Filia Partnership Ltd | Hospitality | 2019 |
| Filipa Retail Ltd | Wholesale & retail | 2019 |
| Fill Flawless Ltd | Other services | 2021 |
| Fill GAP Ltd | Health & social care | 2015 |
| Fille Garçon Ltd | Wholesale & retail | 2024 |
| Fillings Limited | Hospitality | 2019 |
| Fillip Media Ltd | Financial services | 2018 |
| Film Club Entertainment Limited | Arts & recreation | 2022 |
| Filmaluation Limited | Arts & recreation | 2013 |
| Filmitvfxstudios Limited | Information & communication | 2025 |
| Filmlevision Productions Ltd | Information & communication | 2023 |
| Filura Limited | Professional & scientific | 2025 |
| Fimx Limited | Wholesale & retail | 2025 |
| FIN App Ltd | Other services | 2025 |
| Financial Additions Limited | Administrative & support | 2020 |
| Financial Divisions (City) LLP | | 2010 |
| Financial Divisions Limited | Administrative & support | 2010 |
| Financial Services London Limited | Financial services | 2022 |
| Financial Understanding, Empowerment and Literacy CIC | Education | 2025 |
| Financin Ltd | Education | 2020 |
| Finanza London Ltd | Financial services | 2018 |
| Finavarra Ltd | Real estate | 2026 |
| Finberry Estate Management Limited | Households | 2014 |
| FINCELER8 Limited | Professional & scientific | 2016 |
| Finch Hardware & DIY Limited | Wholesale & retail | 2015 |
| Finch Park (Tyldesley) Management Company Ltd | Households | 2020 |
| Fincsol Accountancy Limited | Professional & scientific | 2023 |
| Find ME a MAN Ltd | Extraterritorial | 2013 |
| Findley’S Kitchen Ltd | Hospitality | 2021 |
| Findon Catering Limited | Hospitality | 2024 |
| Findsy Group Limited | Professional & scientific | 2024 |
| Fine and Clean Ltd | Administrative & support | 2024 |
| Fine Constructions Ltd | Construction | 2021 |
| Fine Crafts Ltd | Wholesale & retail | 2020 |
| Fine Touch Building Limited | Construction | 2015 |
| Fine Woodworking Creations Ltd | Construction | 2017 |
| Finedon Convenience Store Limited | Wholesale & retail | 2004 |
| Finescalps Ltd | Other services | 2022 |
| Finesscity Ltd. | Wholesale & retail | 2013 |
| Finesse Auto Detailing Ltd | Administrative & support | 2024 |
| Finesse Financial Services Ltd | Financial services | 2023 |
| Finesse Foreva Ltd | Administrative & support | 2017 |
| Finesse Republic Ltd | Wholesale & retail | 2024 |
| Finest Cafe Ltd | Hospitality | 2023 |
| Finest Household Limited | Wholesale & retail | 2025 |
| Fingers Kebab Ltd | Hospitality | 2025 |
| Finny Repair and Management Services Ltd | Other services | 2024 |
| Finovo Accountants Limited | Professional & scientific | 2026 |
| Fins Next Limited | Professional & scientific | 2025 |
| Finsley Consulting Limited | Professional & scientific | 2003 |
| Finstitch Limited | Information & communication | 2026 |
| Finteam Ltd | Information & communication | 2023 |
| Fintech Analytics Limited | Administrative & support | 2017 |
| Fintiple Advisors Limited | Professional & scientific | 2025 |
| Fire & Flavour Grill Limited | Hospitality | 2025 |
| Fireaway Tunbridge Wells Ltd | Hospitality | 2023 |
| Firedoc Ltd. | Information & communication | 2019 |
| Firefi Capital Ltd | Financial services | 2019 |
| Fireflies Nursery Limited | Health & social care | 2015 |
| Firehorse International Limited | Education | 2023 |
| Firepool Crescent (Taunton) Management Company Limited | Households | 2016 |
| Firm Foundation Properties Ltd | Real estate | 2021 |
| Firm Q Ventures LLP | | 2022 |
| Firm Recruitment Ltd | Administrative & support | 2024 |
| Firma Italiana Ltd | Professional & scientific | 2017 |
| Firovia Limited | Other services | 2010 |
| Firoz & Co Limited | Professional & scientific | 2002 |
| Firs Brighton Ltd | Health & social care | 2024 |
| First Bagleys Lane Management Company Limited | Households | 1982 |
| First Choice Hats Limited | Wholesale & retail | 2015 |
| First Choice Property Holdings Limited | Construction | 2022 |
| First Choice Saving Experts Ltd | Other services | 2019 |
| First Choice Systems Finance Limited | Financial services | 2003 |
| First Class Care Solutions Ltd | Health & social care | 2024 |
| First Come First Served Limited | Hospitality | 1998 |
| First Container Lines UK Ltd | Transport & logistics | 2022 |
| First Dalethro Limited | Information & communication | 2012 |
| First Glance Hair Salon Limited | Other services | 2016 |
| First Key Property Ltd | Real estate | 2026 |
| First Level Construction Limited | Construction | 2024 |
| First Pilgrims Management Company Limited | Households | 1985 |
| First Point Cleaning LP | | 2011 |
| First Power Solution Ltd | Construction | 2011 |
| First Precedent & Visa Services Ltd | Professional & scientific | 2001 |
| First Solutions Ltd | Administrative & support | 2007 |
| First Step at Nursery Ltd | Education | 2025 |
| First Step Care, Services Limited | Health & social care | 2026 |
| First Step Learn Limited | Education | 2020 |
| First Steps Nurseries Limited | Other services | 2004 |
| First Technology Transfer Limited | Professional & scientific | 1991 |
| First Transport UK Ltd | Transport & logistics | 2015 |
| First UK Cleaning Limited | Administrative & support | 2022 |
| First Within Limited | Professional & scientific | 2022 |
| First-Hand Ltd | Education | 2019 |
| Firstax Accountant Limited | Professional & scientific | 2010 |
| Firstline Training, Advisory and Business Services Ltd | Real estate | 2025 |
| Firstviewing Limited | Real estate | 2005 |
| Fish and Chippy Limited | Hospitality | 2019 |
| Fish Bowl Limited(The) | Wholesale & retail | 1974 |
| Fish on the Hill Limited | Hospitality | 2016 |