| Fireflyfriends Ltd | Wholesale & retail | 2014 |
| Firestopping Solutions Ltd | Construction | 2008 |
| First Blinds Ltd | Wholesale & retail | 2020 |
| First for Composites Ltd | Construction | 2020 |
| First Forensic Solutions Ltd | Professional & scientific | 2009 |
| First Itech Solutions LLP | | 2024 |
| First Property Experts LLP | | 2024 |
| Fitint LP | | 2019 |
| Fitzgas Ltd | Construction | 2020 |
| Fitzpatrick Tractors Holdings Ltd | Financial services | 2022 |
| FIVEFIVE18 Property Limited | Other services | 2022 |
| FJM Group Holdings Ltd | Financial services | 2025 |
| Flair Showers Ltd | Manufacturing | 2017 |
| Fleet Consult and Logistics Limited | Wholesale & retail | 2015 |
| Fleming Maxwell Peacock T/A WBT Ltd | Financial services | 2013 |
| Flex Fuel Ltd | Arts & recreation | 2026 |
| Flickerpix (Distribution) Limited | Information & communication | 2025 |
| Flickerpix (Luna) Limited | Information & communication | 2025 |
| Flickerpix (Spaced AZ) Limited | Information & communication | 2026 |
| Flickerpix Limited | Information & communication | 2003 |
| Flo-Mix (UK) Ltd | Manufacturing | 2014 |
| Flood Risk Consulting Limited | Professional & scientific | 2015 |
| Flourish (Lisburn) Limited | Extraterritorial | 1991 |
| Flower Boutique Lisburn Limited | Wholesale & retail | 2014 |
| Flowright Belfast Plumbing Ltd | Construction | 2025 |
| Flxw Automotive Ltd | Wholesale & retail | 2026 |
| Flyaway Aerial Studio LLP | | 2015 |
| Focus Floors NI Ltd | Construction | 2020 |
| Fools Gold Events Ltd | Hospitality | 2025 |
| Foreman Consultants Global Ltd | Professional & scientific | 2014 |
| Forever Bridal Boutique Ltd | Wholesale & retail | 2022 |
| Forge Physiotherapy Ltd | Health & social care | 2022 |
| Forgedni Ltd | Real estate | 2020 |
| Forkstab Ltd | Wholesale & retail | 2026 |
| Forthill Gospel Hall Trust | Other services | 2015 |
| Forwardpm Ltd | Professional & scientific | 2026 |
| Foster & Sons Holdings Ltd | Real estate | 2023 |
| Foster & Sons Ltd | Transport & logistics | 2020 |
| Fosters Property (2020) Ltd | Real estate | 2020 |
| Fosters Tyre Services (2021) Ltd | Wholesale & retail | 2021 |
| Fosters Tyre Services Limited | Wholesale & retail | 2015 |
| Fosters Tyres Derriaghy Limited | Wholesale & retail | 2016 |
| Foxhair Limited | Other services | 2003 |
| Foyle Contracting Ltd | Construction | 2020 |
| FPB Cyber Limited | Information & communication | 2023 |
| FPF Contracts Limited | Construction | 2003 |
| Frazer Evans Consultancy Limited | Professional & scientific | 2022 |
| Fred Dalzell (Lisburn) Ltd | Real estate | 2009 |
| Freedom Tyres Ltd | Wholesale & retail | 2025 |
| Freewer LP | | 2018 |
| Fresh Foods and Cafe Ltd | Hospitality | 2020 |
| Fresh Life Church Limited | Other services | 2025 |
| Freshcoatni Limited | Construction | 2026 |
| Friends of Nigeria - RVH Save a Heart Foundation | Health & social care | 2014 |
| Frost Investments Limited | Professional & scientific | 2014 |
| Fruck Foods Ltd | Hospitality | 2026 |
| Fruitvale Farm Ltd | Wholesale & retail | 2020 |
| Fuel-Tec Limited | Manufacturing | 2010 |
| Fugen Construction Services Ltd | Professional & scientific | 2019 |
| Full Circle Infosec Ltd | Information & communication | 2026 |
| Fulmaxgroup Limited | Hospitality | 2021 |
| Fulmaxsolutions Limited | Information & communication | 2018 |
| FUM Limited | Administrative & support | 1996 |
| Function Design Furniture Limited | Manufacturing | 2012 |
| Fungoodstrade LP | | 2022 |
| FX Capital Group LP | | 2021 |
| G & G Leasing Ltd | Administrative & support | 2024 |
| G & K Smiley Ltd | Construction | 2015 |
| G & S Decorators Ltd | Construction | 2019 |
| G Mccalmont Hair Ltd | Other services | 2021 |
| G Millen Contracting Limited | Manufacturing | 2024 |
| G Wilson Cleaning Services Ltd | Administrative & support | 2024 |
| G&T Projects Limited | Professional & scientific | 2012 |
| G. & J. Geddis Ltd. | Other services | 1987 |
| G. P. Marketing Limited | Wholesale & retail | 1994 |
| G.A.D.T Consulting Ltd | Administrative & support | 2010 |
| G5 Gateway Offices Ltd | Construction | 2007 |
| Gacusana Limited | Health & social care | 2021 |
| Gail Marks Podiatry Ltd | Other services | 2019 |
| Galberts Food Products Ltd | Manufacturing | 2024 |
| Galleria Mart Ltd | Wholesale & retail | 2026 |
| Galref Limited | Real estate | 2013 |
| Galway Psychology Practice Ltd | Health & social care | 2023 |
| Game Amusements (NI) Ltd | Administrative & support | 2025 |
| Game on Comps Ltd | Arts & recreation | 2025 |
| Gardiner Farm Equipment Ltd | Wholesale & retail | 2008 |
| Gardiner's Kitchen Ltd | Hospitality | 2008 |
| Garvey Glass & Glazing Ltd | Construction | 2026 |
| Gascoigne Garden & Tree Services Ltd | Agriculture & fishing | 2018 |
| Gatecross Real Estate LLP | | 2018 |
| Gavigan Sales & Recovery Ltd | Transport & logistics | 2025 |
| Gawina Ltd | Wholesale & retail | 2024 |
| Gaxugn Ltd | Wholesale & retail | 2024 |
| Gbee Solutions Ltd | Financial services | 2025 |
| GDC Fire and Security Limited | Administrative & support | 2021 |
| GDC Interiors (UK) Ltd | Professional & scientific | 2023 |
| GDC Workspace Limited | Professional & scientific | 2023 |
| GDE Holdings Limited | Professional & scientific | 2018 |
| GDE Property Holdings Ltd | Real estate | 2022 |
| Geini Limited | Energy | 2013 |