| FTS Full Tree Service Ltd | Construction | 2025 |
| FTS888TRADE Limited | Wholesale & retail | 2025 |
| Ftsl Realisations Limited | Manufacturing | 2009 |
| Ftsv Ltd | Other services | 2020 |
| FTW Clothing Ltd | Manufacturing | 2018 |
| FTY Consultation Ltd | Professional & scientific | 2020 |
| FU Consulting Ltd | Professional & scientific | 2023 |
| FU JI GAS Solution Limited | Wholesale & retail | 2019 |
| Fu's Healing Hands Ltd | Other services | 2014 |
| Fuadco Ltd | Information & communication | 2025 |
| FUD Properties Limited | Real estate | 2025 |
| Fudingroupian Limited | Hospitality | 2025 |
| Fuego Incorporated Ltd | Wholesale & retail | 2026 |
| Fuego Wear Ltd | Wholesale & retail | 2025 |
| Fuel Cell Engineering Limited | Manufacturing | 2019 |
| Fuel Fusion Ltd | Health & social care | 2024 |
| Fuel Properties (Norwich) Limited | Construction | 2019 |
| Fuel Stop 2026 Ltd | Wholesale & retail | 2026 |
| Fuelsoft Limited | Information & communication | 2007 |
| Fuente Alamo LP | | 2017 |
| Fueri Trading Limited | Wholesale & retail | 2020 |
| Fuina Care Ltd | Health & social care | 2022 |
| FUKO0TON Ltd | Wholesale & retail | 2025 |
| Fuku Fashion Designer Ltd | Wholesale & retail | 2023 |
| FUL Realisations Limited | Manufacturing | 2006 |
| Fulani Trading Ltd | Wholesale & retail | 2014 |
| Fulbe UK CIC | Professional & scientific | 2023 |
| Fulcrum Capital Investments Ltd | Real estate | 2018 |
| Fulcrum Care Services Ltd | Professional & scientific | 2021 |
| Fulcrum IT Partners Ltd | Financial services | 2022 |
| Fulcrum Pegasus Prodec Exchange Co Ltd | Financial services | 2022 |
| Fulcrum Pegasus Pure Exchange Co Ltd | Financial services | 2022 |
| Fulham Houses Ltd | Professional & scientific | 2016 |
| Fulkoli Mithai Ghor Ltd | Hospitality | 2020 |
| Full Cart Ltd | Wholesale & retail | 2025 |
| Full Construction Consultancy Limited | Construction | 2019 |
| Full Cover Media Limited | Manufacturing | 2024 |
| Full Guard Management Ltd | Financial services | 2026 |
| Full Home Limited | Real estate | 2025 |
| Full Link Ltd | Extraterritorial | 2017 |
| Full Moon (UK) Ltd | Real estate | 2015 |
| Full of Joy Ltd | Real estate | 2020 |
| Full of Ramen Ltd | Hospitality | 2025 |
| Full Sunshine Group Ltd | Wholesale & retail | 2024 |
| Full Works Motorsport Limited | Professional & scientific | 2018 |
| Full-A-Flava Restaurant Ltd | Hospitality | 2020 |
| Fullcircle Property Group Ltd | Real estate | 2022 |
| Fullemploy Limited | Administrative & support | 2012 |
| Fullers Electrical Limited | Construction | 2016 |
| Fullhouse Capital Ltd | Financial services | 2026 |
| Fullhouse Pizza Aston Ltd | Hospitality | 2026 |
| Fullmac Construction Ltd | Construction | 2015 |
| Fullscape Designs Ltd | Administrative & support | 2023 |
| Fullview Estate Limited | Real estate | 2024 |
| Fullwood Properties Ltd | Real estate | 2021 |
| Fully Company Limited | Wholesale & retail | 2021 |
| Fulwood Housing CIC | Real estate | 2022 |
| Fulwood Road Leisure Ltd | Hospitality | 2025 |
| Fumari Automotive Limited | Administrative & support | 2021 |
| Fumari Events Ltd | Hospitality | 2026 |
| Fumari Limited | Real estate | 2025 |
| Fumari the Lounge Ltd | Hospitality | 2021 |
| Fumas Group Ltd | Real estate | 2026 |
| FUN 4 Life | Health & social care | 2007 |
| FUN Accommodation Ltd | Real estate | 2020 |
| FUN at Harvey Road Ltd | Education | 2015 |
| FUN Fest Lichfield Ltd | Health & social care | 2020 |
| FUN Kinks Limited | Wholesale & retail | 2023 |
| FUN Live Ltd | Arts & recreation | 2024 |
| FUN Lord Limited | Administrative & support | 2009 |
| FUN N Bounce Castles Ltd | Arts & recreation | 2025 |
| FUN on the Go Ltd | Wholesale & retail | 2022 |
| FUN Otto Limited | Administrative & support | 2011 |
| FUN Stuff Limited | Wholesale & retail | 2025 |
| FUN Train Limited | Administrative & support | 2009 |
| Fun-Kay Bakery and Catering Services Limited | Hospitality | 2017 |
| Funantics Holiday Kids Club C.I.C. | Health & social care | 2022 |
| Funantics Kids Club Limited | Health & social care | 2018 |
| Func Social Media Ltd | Professional & scientific | 2023 |
| Functional Choice Ltd | Health & social care | 2023 |
| Functional Property Solutions Ltd | Real estate | 2019 |
| Functional Serviced Accommodation Ltd | Real estate | 2022 |
| Fundi Financial Limited | Financial services | 2019 |
| Fundi Holdings Limited | Financial services | 2019 |
| Funding Limited | Wholesale & retail | 2021 |
| Fundinghero Ltd | Professional & scientific | 2022 |
| Fundraising Management Consultancy Limited | Professional & scientific | 2023 |
| Funeral Cost Compare Ltd | Administrative & support | 2025 |
| Funfriend Limited | Information & communication | 2015 |
| Fung Brothers Limited | Real estate | 2021 |
| Fung Sing Hong Company Limited | Real estate | 2021 |
| Fung Wong 666 Ltd | Hospitality | 2024 |
| Fungalist by Nature Ltd | Wholesale & retail | 2026 |
| Funguyspromotions Ltd | Administrative & support | 2025 |
| Funiculì Ltd | Hospitality | 2022 |
| Funkalates Limited | Other services | 2012 |
| Funky Arts Ltd | Wholesale & retail | 2023 |
| Funky Cube Limited | Wholesale & retail | 2025 |
| Funky Financial Solutions Ltd | Financial services | 2022 |
| Funky Floof Ltd | Wholesale & retail | 2021 |