| Falcon Quality Services Ltd | Professional & scientific | 2025 |
| Falcon Removals and Property Services Ltd | Water & waste | 2025 |
| Falloon Properties Limited | Real estate | 2023 |
| Family Real Estate Ltd | Real estate | 2024 |
| Family Shopper (NE) Limited | Wholesale & retail | 2017 |
| Famous Food Stores Limited | Wholesale & retail | 2017 |
| Fantastic Law Limited | Professional & scientific | 2014 |
| FAR Food Limited | Hospitality | 2019 |
| Farah for Import and Export Ltd | Wholesale & retail | 2024 |
| Fareed by Desire Ltd | Financial services | 2025 |
| Farhaan Fades Ltd | Other services | 2026 |
| Farhaj Ltd | Professional & scientific | 2021 |
| Farid Banu Ltd | Transport & logistics | 2025 |
| Farm Machinery Hire Ltd | Wholesale & retail | 2025 |
| Farooq Logistics Ltd | Transport & logistics | 2026 |
| Farrellys World Ltd | Manufacturing | 2023 |
| Fast Fella Deliveries Limited | Transport & logistics | 2026 |
| Fast Flow Concrete Limited | Administrative & support | 2021 |
| Fault Finder Diagnostics Ltd | Wholesale & retail | 2025 |
| Favour Foods Ltd. | Hospitality | 2026 |
| FAW Trucks UK Limited | Wholesale & retail | 2014 |
| Fawcett & Hetherington Funeral Service Limited | Other services | 2014 |
| Fayhal Limited | Information & communication | 2011 |
| FB Safety Consultants Limited | Professional & scientific | 2026 |
| FB Venture Group Ltd | Professional & scientific | 2025 |
| FC Consulting International Ltd | Arts & recreation | 2022 |
| FC Middlesbrough Ltd | Hospitality | 2024 |
| FCG Logistics Limited | Transport & logistics | 2025 |
| FCL Investments Limited | Financial services | 2025 |
| FCM Services UK Limited | Construction | 2022 |
| FCR Recruitment Limited | Administrative & support | 2005 |
| FDT Focusdaytraining Limited | Health & social care | 2016 |
| FDX Consulting Limited | Health & social care | 2012 |
| Feeding Frenzy Limited | Wholesale & retail | 2025 |
| Feedpulse Ltd | Information & communication | 2025 |
| Feel Good Food Ltd | Wholesale & retail | 2025 |
| Feel Warm Ltd | Construction | 2013 |
| Feenixsolutions Ltd | Information & communication | 2021 |
| Feetus Ltd | Wholesale & retail | 2016 |
| Feline Beauty Ltd | Wholesale & retail | 2025 |
| Female Founder UK Limited | Professional & scientific | 2023 |
| Fenk Services Ltd | Construction | 2026 |
| Fentech Offshore Limited | Professional & scientific | 2025 |
| Fenwick Farm 123 Ltd | Agriculture & fishing | 1988 |
| Ferguson & Sons Developments Ltd | Real estate | 2026 |
| Ferguson Robson Holdings Ltd | Real estate | 2025 |
| Fernandos Group Ltd | Hospitality | 2024 |
| Fernhouse Construction Services Ltd | Construction | 2021 |
| Fernhouse Gardens & Homes Ltd | Construction | 2025 |
| Fernhouse Properties Ltd | Real estate | 2021 |
| Fernies Limited | Hospitality | 2025 |
| Ferns Food Limited | Hospitality | 2019 |
| Fernsoft Limited | Manufacturing | 1992 |
| Fernweh Collective Ltd | Professional & scientific | 2024 |
| Fernwood Ltd | Real estate | 2021 |
| Ferox Engineering Solutions Ltd. | Manufacturing | 2016 |
| Ferox Fishing Ltd | Wholesale & retail | 2019 |
| Feroz Construction Limited | Construction | 2025 |
| Ferret Consultants Limited | Information & communication | 1989 |
| Festival Shop (NE) Limited | Wholesale & retail | 2016 |
| Fewster Installations Ltd | Construction | 2024 |
| FG Scaffolding Ltd | Construction | 2022 |
| FGS Herbals Limited | Wholesale & retail | 2017 |
| FIA Investments Ltd | Real estate | 2023 |
| Fibre MAX Services Ltd | Administrative & support | 2021 |
| Fielding Business Consulting Ltd | Administrative & support | 2022 |
| Fields Construction Ltd | Construction | 2023 |
| Fields Inspection Services Ltd | Professional & scientific | 2020 |
| File Sanctuary Ltd | Information & communication | 2013 |
| Files Ltd | Information & communication | 2018 |
| Film Phones Pro Ltd | Information & communication | 2023 |
| Finance First North East Limited | Financial services | 2009 |
| Finance North East Ltd | Financial services | 2019 |
| Fincat Consultancy Limited | Professional & scientific | 2016 |
| Fine Contract Research Limited | Manufacturing | 2010 |
| Fine Environmental Services Limited | Water & waste | 2010 |
| Fine Facilities Management Limited | Manufacturing | 2010 |
| Fine Industries Limited | Professional & scientific | 2008 |
| Fine Organics Limited | Manufacturing | 1980 |
| Fineline H&S Ltd | Health & social care | 2024 |
| Finishing Touches Commercial Cleaning Ltd | Administrative & support | 2026 |
| Finisterre Marine Services Limited | Transport & logistics | 2012 |
| Finley Incorporated Limited | Construction | 2025 |
| Finn Access Ltd | Construction | 2023 |
| Finnighan Engineering Services Ltd | Professional & scientific | 2019 |
| Finns (Steeplejacks) Knottingley Limited | | 1971 |
| Finregen Limited | Professional & scientific | 2025 |
| Fira Consulting Limited | Professional & scientific | 2016 |
| Fire Pizza (NE) Ltd | Hospitality | 2026 |
| Firecladd Ltd | Construction | 2024 |
| Firefly Industrial Services Limited | Professional & scientific | 2017 |
| Fireplace & Wallpaper Company Limited | Manufacturing | 2011 |
| Firetech Safety Solutions Ltd | Construction | 2025 |
| Firoz Real Estate Limited | Real estate | 2022 |
| First 1 Car Centre Ltd | Wholesale & retail | 2018 |
| First Choice Castles Ltd | Administrative & support | 2026 |
| First Class Body Repairs Ltd | Wholesale & retail | 2025 |
| First Class Financial Centre Ltd | Financial services | 2022 |
| First Glass Windows (North East) Limited | Construction | 2021 |
| First Hand Courier Services Limited | Transport & logistics | 2023 |