| Fairy Glen Brewery Ltd | Manufacturing | 2018 |
| Faith in GOD Ministry Wales Limited | Other services | 2018 |
| Faithguard Ltd | Professional & scientific | 2023 |
| Falcon Equipment Ltd | Manufacturing | 2018 |
| Falcon Patrol Ltd | Other services | 2024 |
| Falconridge Investments Limited | Financial services | 1997 |
| Falconridge Properties Ltd | Real estate | 2018 |
| Falooda Ltd | Hospitality | 2025 |
| Falshaw Homes Limited | Construction | 2012 |
| Famalam 16 Limited | Wholesale & retail | 2016 |
| Family F Properties Ltd | Real estate | 2026 |
| Family Nurseries Ltd | Health & social care | 2022 |
| Familydarts Ltd | Arts & recreation | 2023 |
| Famitech Ltd | Information & communication | 2023 |
| Faqiri Ltd | Wholesale & retail | 2025 |
| Farang London Ltd | Hospitality | 2015 |
| Farm to Fork Catering Limited | Hospitality | 2024 |
| Farm Wight Ltd | Professional & scientific | 2024 |
| Farmbank Towing Centre Ltd | Other services | 2016 |
| Farmers Arms Goldcliff 2025 Ltd | Hospitality | 2025 |
| Farmersarmsgold Limited | Hospitality | 2019 |
| Farming Partners Limited | Agriculture & fishing | 1999 |
| Farney Limited | Real estate | 2011 |
| Farnhamhomes Limited | Real estate | 2007 |
| Farrier Place (Canford) Management Company Limited | Households | 2022 |
| Farries Fish Bar Ltd | Hospitality | 2022 |
| Fashion 29 Limited | Wholesale & retail | 2014 |
| Fashion Enterprises Ltd | Wholesale & retail | 2016 |
| Fast & Perfect Heating Services Ltd | Manufacturing | 2022 |
| Fast Connection Limited | Wholesale & retail | 2022 |
| Fast Delivery 83 Ltd | Transport & logistics | 2025 |
| Fast Fabrications Limited | Manufacturing | 2002 |
| Fast KA Properties Ltd | Real estate | 2025 |
| Fast Road Cars Limited | Wholesale & retail | 2009 |
| Fast Track Car Services Ltd | Wholesale & retail | 2017 |
| Fast Track Flooring UK Limited | Construction | 2016 |
| Fast TRACK91' Limited | Transport & logistics | 2025 |
| Fastloot Ltd | Wholesale & retail | 2026 |
| Fatima Cafe Bristol 1 Ltd | Hospitality | 2021 |
| Fatima Cafe's Bristol 2 Ltd | Hospitality | 2025 |
| Fatima Cafe's Ltd | Wholesale & retail | 2019 |
| Fatima Group Ltd | Financial services | 2021 |
| Fatima Technologies T/A Code Canvas Media Ltd | Information & communication | 2026 |
| Fatziki Ltd | Hospitality | 2026 |
| Fawsitt Consulting Ltd | Professional & scientific | 2021 |
| Fawsitt Holdings Ltd | Financial services | 2021 |
| Fayre Oaks Properties Limited | Real estate | 2025 |
| FAZ Property Ltd | Real estate | 2026 |
| FB Close Management Company Limited | Households | 2020 |
| FC Mill Heath Ltd | Health & social care | 2003 |
| FCE (Wales) Ltd | Construction | 2007 |
| Fe'Male EGO Ltd | Other services | 2024 |
| Feasible Networks Ltd | Information & communication | 2018 |
| Feat Tech Solutions Ltd | Information & communication | 2024 |
| Feedback IW Ltd | Agriculture & fishing | 2016 |
| Felchuma Ltd | Health & social care | 2020 |
| Felfeg International Services Ltd | Wholesale & retail | 2026 |
| Felixtriton Limited | Real estate | 2022 |
| Fell Social Care Ltd | Health & social care | 2012 |
| Femnicity Group Ltd | Information & communication | 2026 |
| Fenergy Glass Limited | Construction | 2021 |
| Fenergy Group Ltd | Financial services | 2024 |
| Fenergy Renewables Ltd | Construction | 2024 |
| Fengyun Limited | Hospitality | 2017 |
| Fentrade Limited | Manufacturing | 2018 |
| Feral Ltd | Other services | 2018 |
| Fern Lodge (IW) Management Company Limited | Households | 2006 |
| Fernando Property Group Limited | Real estate | 2024 |
| Fernando's Oriental Store Limited | Wholesale & retail | 2023 |
| Fernhill Capital Holdings LLP | | 2022 |
| Fernhill Estates Limited | Agriculture & fishing | 1953 |
| Fernhill Property Services Limited | Construction | 2024 |
| Fernlise Ltd | Professional & scientific | 2020 |
| Fernquest Financial Planning Limited | Financial services | 2014 |
| Fernquest Property Limited | Real estate | 2020 |
| Ferreira Logistics Ltd | Wholesale & retail | 2018 |
| Fesel Company Limited | Public administration | 2025 |
| FF Scaffolding Ltd | Construction | 2021 |
| Ffenics Medical Limited | Public administration | 2016 |
| Fferm Gelli Livery Ltd | Agriculture & fishing | 2024 |
| Fferm Gelli Ltd | Hospitality | 2024 |
| Fforest Farms(Pembrokeshire)Limited | Agriculture & fishing | 1954 |
| Ffos Y Fran Properties Limited | Water & waste | 2026 |
| Ffydd Holdings Ltd | Financial services | 2024 |
| FG Business Solutions Limited | Professional & scientific | 2024 |
| FH Blade Repairs Ltd | Professional & scientific | 2023 |
| Fibercon Distribution UK Ltd | Wholesale & retail | 2024 |
| Fides Holdings Ltd | Real estate | 2020 |
| Field Court (Management) Company Limited | Households | 1969 |
| Field Freight Solutions Limited | Transport & logistics | 2025 |
| Fielden Construction Group Ltd | Manufacturing | 2024 |
| Fields Care Home Ltd | Health & social care | 2016 |
| Fields Manor Management Co Limited | Households | 2018 |
| Fields Park Holdings Limited | Financial services | 2021 |
| Fields Park Productions Limited | Information & communication | 2022 |
| Fieldstone Property Limited | Real estate | 2015 |
| Fife Court (Cowes) Management Company Limited | Households | 2005 |
| Fifty Degrees North Consulting Limited | Information & communication | 2016 |
| FIFTY17 Ltd | Professional & scientific | 2021 |
| FIFTYONE3 Limited | Administrative & support | 2011 |