| Fabron Limited | Real estate | 1977 |
| Facially Flawless Aesthetics Ltd | Administrative & support | 2016 |
| Fact Community Ltd | Extraterritorial | 2016 |
| Factory Automation Expert Ltd | Manufacturing | 1999 |
| Factory Automation Ltd | Extraterritorial | 2011 |
| Fade Lounge Barbers Ltd | Other services | 2021 |
| Faded Men's Barbering Fenham Limited | Other services | 2026 |
| Faded Men’S Barbering Limited | Other services | 2021 |
| Fadi Safar Ltd | Health & social care | 2023 |
| Fair Estates Talk Ltd | Real estate | 2016 |
| Fairfield Management Company (Hexham) Limited | Households | 2026 |
| Fairfields Management Company (North West) Limited | Households | 2022 |
| Fairplay FEC Ltd | Construction | 2025 |
| Fairway Development Planning Limited | Professional & scientific | 2022 |
| Falcombe Trading Limited | Extraterritorial | 2010 |
| Falcombe Trading NO. 1 Limited | Extraterritorial | 2010 |
| Falcombe Trading NO. 2 Limited | Arts & recreation | 2010 |
| Falcon Electrical Solutions (NE) Limited | Construction | 2013 |
| Falconvale Limited | Real estate | 2016 |
| Falcus & Wood Ltd | Wholesale & retail | 2023 |
| Fall Protection UK Holdings Limited | Other services | 2025 |
| Family Estate Planning Solutions Limited | Financial services | 2015 |
| Family's Care Limited | Health & social care | 2024 |
| Famstay Properties Ltd | Real estate | 2025 |
| Fantasia Group Limited | Arts & recreation | 2024 |
| Fantasia Productions Ltd | Arts & recreation | 2019 |
| Fantasy Space Limited | Arts & recreation | 2002 |
| FAR Away Eyes Limited | Professional & scientific | 2014 |
| Farcom Ltd | Wholesale & retail | 2024 |
| Farmer & Carlisle Holdings Limited | Extraterritorial | 2000 |
| Farmer and Carlisle Leicester Limited | Extraterritorial | 1995 |
| Farmer and Carlisle Limited | Extraterritorial | 1975 |
| Farnacres Limited | Hospitality | 2008 |
| Farne View Limited | Real estate | 2021 |
| Farvahar Investments Limited | Real estate | 2019 |
| Fashco Ltd | Professional & scientific | 2023 |
| Fashion Logic Consultancy Ltd | Professional & scientific | 2025 |
| Fast and Furry Ltd | Other services | 2023 |
| Fastfooduk Ltd | Hospitality | 2025 |
| Fattoush & Co NCL Ltd | Hospitality | 2026 |
| Fattoush House Ltd | Hospitality | 2025 |
| Fattoush Lounge Metro Limited | Hospitality | 2018 |
| Fawn and Finch Ltd | Wholesale & retail | 2025 |
| Faworth Limited | Real estate | 1973 |
| Fayms Group Limited | Wholesale & retail | 2015 |
| FB Home Improvements Ltd | Construction | 2018 |
| FE Twenty SIX Limited | Professional & scientific | 2013 |
| Fearon Construction Limited | Construction | 2025 |
| Feel Well Deli Ltd | Hospitality | 2020 |
| Feet Excellence Ltd | Health & social care | 2008 |
| Feiger Holdings Ltd | Real estate | 2017 |
| Feld Limited | Real estate | 2012 |
| Fellgate FX Limited | Professional & scientific | 2021 |
| Felling ABC CIC | Arts & recreation | 2025 |
| Felling by Pass Limited | Extraterritorial | 2021 |
| Felling Cricket Club C.I.C. | Arts & recreation | 2014 |
| Felling Nails & Beauty (Gateshead) Limited | Other services | 2025 |
| Felling Property 2 Ltd | Extraterritorial | 2015 |
| Felt Nowt Productions CIC | Education | 2020 |
| Femaj Group Ltd | Wholesale & retail | 2026 |
| Femeckndu African and Caribbean Shop Ltd | Wholesale & retail | 2023 |
| Fenwick Construction Project Management Consultancy Ltd | Construction | 2024 |
| Fenwick Masonry Limited | Construction | 2013 |
| Ferguson Medical Care Ltd | Health & social care | 2015 |
| FES Building Services Engineers NE Ltd | Construction | 2025 |
| Fetch Dog Films Limited | Information & communication | 2026 |
| Fetching Feet Chiropody Limited | Health & social care | 2026 |
| Fezza Locum Ltd | Health & social care | 2016 |
| FH Forensic Psychology Ltd | Administrative & support | 2017 |
| FHI Solutions Limited | Other services | 2018 |
| Fibo Energy Construction Ltd | Construction | 2021 |
| Fibreline Network Services Ltd | Information & communication | 2020 |
| Fiesta Showland Transport Limited | Administrative & support | 1996 |
| Fifteen Streets Ltd | Real estate | 2022 |
| Fifth Element Wealth Ltd | Real estate | 2021 |
| FIG Enterprises Ltd | Wholesale & retail | 2012 |
| FIG Properties Ltd | Real estate | 2018 |
| Fightbox Ltd | Professional & scientific | 2019 |
| Fighting ALL Cancers Together | Professional & scientific | 2009 |
| Fighting ALL Cancers Together Trading Company Limited | Health & social care | 2010 |
| Fika Gallery Limited | Wholesale & retail | 2024 |
| Filmnova Limited | Information & communication | 1997 |
| Filmosure Studio Ltd | Manufacturing | 2026 |
| Finance 55 Ltd | Financial services | 2015 |
| Financial Advisory Services and Training Ltd | Professional & scientific | 2019 |
| Finato Limited | Information & communication | 2025 |
| Fine Maintenance Ltd | Other services | 2014 |
| Finesse Furnishings Limited | Manufacturing | 2002 |
| Finest Health Supplies Ltd | Health & social care | 2016 |
| Finestone Consultancy Limited | Professional & scientific | 2025 |
| Finfrac Ltd | Professional & scientific | 2024 |
| Finley Ventures Ltd | Real estate | 2011 |
| Fiona Henderson Company Limited | Health & social care | 2017 |
| FIR Tree One Ltd | Construction | 2019 |
| FIR Tree Residential Limited | Administrative & support | 2021 |
| Fire Door Suppliers Limited | Construction | 2021 |
| Fire Industry Solutions Limited | Financial services | 2025 |
| Fire Smart Assessments Ltd | Public administration | 2024 |
| Firedup Pottery Ltd | Arts & recreation | 2025 |
| Firestone Artisan Ltd | Hospitality | 2020 |