| FFB Growth UK Limited | Arts & recreation | 2020 |
| FFF Andy Carr Limited | Arts & recreation | 2025 |
| FFF Mike Sudworth Limited | Arts & recreation | 2024 |
| Ffrsk Ltd | Financial services | 2023 |
| FG Barbers NE Ltd | Other services | 2025 |
| Fgomespropertybusiness Limited | Real estate | 2021 |
| FHM Solutions Ltd | Real estate | 2019 |
| Fiberstream Ltd | Construction | 2023 |
| Fibratus Ltd | Information & communication | 2016 |
| Fibreon Broadband Limited | Information & communication | 2026 |
| Fibrofind IP Ltd | Financial services | 2020 |
| Fibrofind Ltd | Professional & scientific | 2018 |
| Fics Holdings Limited | Financial services | 2022 |
| Fics Optical Ltd | Wholesale & retail | 2018 |
| Fiducia Project Excellence Ltd | Professional & scientific | 2025 |
| Field Homes Limited | Real estate | 2002 |
| Field House RTM Company Limited | Households | 2006 |
| Field Studies Ltd. | Information & communication | 2008 |
| Fielding Park Projects 1 Ltd | Real estate | 2021 |
| Fielding Park Projects Ltd | Households | 2020 |
| Fife Racing Limited | Arts & recreation | 2018 |
| Fifth Element Engineering Ltd | Professional & scientific | 2018 |
| Fifth Element Recruitment Ltd | Administrative & support | 2015 |
| Fifty Grey ST. Limited | Hospitality | 2021 |
| Fight Club UK Tour Limited | Arts & recreation | 2019 |
| Fihsak Atinus Ltd | Wholesale & retail | 2016 |
| Fiju Limited | Manufacturing | 2019 |
| Fikamovement Ltd | Arts & recreation | 2025 |
| Fiki Ltd | Wholesale & retail | 2024 |
| Fileblind Limited | Real estate | 1994 |
| Filematch Limited | Information & communication | 1990 |
| Fill N Squeeze Ltd | Wholesale & retail | 2012 |
| Fillin’In Limited | Health & social care | 2022 |
| Fillworth (UK) Limited | Manufacturing | 2003 |
| Filto Coffee Limited | Hospitality | 2025 |
| Filto Franchise Ltd | Hospitality | 2026 |
| Filto Rolln Bar Limited | Hospitality | 2026 |
| Finalready Property Management Limited | Households | 1994 |
| Finance NE Limited | Financial services | 2025 |
| Finance Tree Limited | Professional & scientific | 2006 |
| Financeed Ltd | Education | 2024 |
| Financial Lyrics Ltd | Administrative & support | 2018 |
| Finchale Training College | Education | 1990 |
| Find My Home Online Limited | Financial services | 2014 |
| Finders Bidco Limited | Financial services | 2015 |
| Finders Holdco Limited | Financial services | 2016 |
| Finders Midco Limited | Extraterritorial | 2015 |
| Finding Your Interests Ltd | Arts & recreation | 2026 |
| Findmeaccommodation.Com Limited | Administrative & support | 2004 |
| Findstylist Ltd | Information & communication | 2026 |
| Fine Art and Crafts Limited | Arts & recreation | 2024 |
| Fine by the Tyne Limited | Real estate | 2016 |
| Fine Coats Ltd | Construction | 2023 |
| Fine Edge Garden Maintenance LLP | | 2021 |
| Fine Edge Landscaping LLP | | 2019 |
| Fine Fish Limited | Hospitality | 2024 |
| Fine Foods NE Ltd | Wholesale & retail | 2024 |
| Fineline Painting & Decorating Services Ltd | Construction | 2022 |
| Finesse Beauty by Coco Ltd | Health & social care | 2022 |
| Finesse UK Engineering Systems Limited | Information & communication | 2013 |
| Finest Barber Shop Ltd | Other services | 2020 |
| Finiqu Ltd | Information & communication | 2021 |
| Finish Golf Ltd | Construction | 2026 |
| Fink Sportswear Limited | Wholesale & retail | 2025 |
| Finley Property Limited | Construction | 2021 |
| Finn Lettings Limited | Real estate | 2024 |
| Finn Motor Works Ltd | Wholesale & retail | 2025 |
| Finnash LLP | | 2025 |
| Finrow Developments Limited | Construction | 2025 |
| Finrow Estates Limited | Real estate | 2025 |
| Fintech Sales International UK Limited | Professional & scientific | 2025 |
| Fintrans Solutions Ltd | Professional & scientific | 2022 |
| Fintry North East Limited | Financial services | 2024 |
| Fiona Ellis Osteopathy Limited | Health & social care | 2017 |
| Fiona Setch Limited | Administrative & support | 2009 |
| Fionda Furnishings Ltd | Manufacturing | 2002 |
| Fiori Design Limited | Wholesale & retail | 2013 |
| Fircombe Ltd | Real estate | 2013 |
| Fire and Thyme Ltd | Hospitality | 2025 |
| Fire Inspect Limited | Administrative & support | 2026 |
| Fire Logistics Limited | Construction | 1999 |
| Fire Protect and Compliance Group Ltd | Professional & scientific | 2024 |
| Fire Safety Inspections Ltd | Public administration | 2023 |
| Fire Technical Services Limited | Manufacturing | 2011 |
| Fires & Living NE Ltd | Wholesale & retail | 2024 |
| Firestone Video Ltd | Information & communication | 2019 |
| Firewater Industries Ltd | Wholesale & retail | 2019 |
| First 4 Social Care Ltd | Administrative & support | 2023 |
| First ACT Theatre | Arts & recreation | 1992 |
| First AID North East Limited | Education | 2014 |
| First AV Limited | Information & communication | 2015 |
| First Call Emergency Response Training Ltd | Education | 2015 |
| First Class Barbers (Newcastle) Limited | Other services | 2017 |
| First Class Learning Gosforth Limited | Education | 2026 |
| First Complete Limited | Financial services | 2005 |
| First Contact Group Limited | Real estate | 2016 |
| First Diamond Car Wash Ltd | Administrative & support | 2019 |
| First Executive Ltd | Transport & logistics | 2018 |
| First for Apprenticeships Limited | Education | 2016 |
| First for Awards Ltd | Education | 2025 |