| Failte Hotel Limited | Hospitality | 1987 |
| Faith in Film Limited | Manufacturing | 2022 |
| Family Cars (N.I.) Ltd | Wholesale & retail | 2019 |
| Family Stone Ltd | Information & communication | 2025 |
| Farimka Limited | Health & social care | 2020 |
| Farm Source and Supply Ltd | Wholesale & retail | 2024 |
| Farrell Farms Limited | Energy | 2010 |
| Fawn Developments Limited | Construction | 1999 |
| FBO Hamilton Investment Company Ltd | Financial services | 2026 |
| Fcfsni Limited | Hospitality | 2025 |
| FCS Services Limited | Administrative & support | 2017 |
| FDS Trading Limited | Manufacturing | 2019 |
| Federation of Family Practices Antrim & Ballymena C.I.C. | Health & social care | 2016 |
| Federation of Family Practices Causeway C.I.C. | Health & social care | 2016 |
| Federation of Family Practices East Antrim C.I.C. | Health & social care | 2016 |
| Federation of Family Practices MID Ulster C.I.C. | Health & social care | 2016 |
| Feedall Pet Foods Limited | Wholesale & retail | 2001 |
| Ferguson Cleaning Services (N.I.) Limited | Administrative & support | 2023 |
| Ferguson Equine Services Limited | Agriculture & fishing | 2017 |
| Ferguson International Ltd | Transport & logistics | 2018 |
| Fernmoor Farm Limited | Agriculture & fishing | 2014 |
| Fetchtag Global Limited | Information & communication | 2022 |
| Fforest Ltd | Professional & scientific | 2026 |
| Fibin Films NI Limited | Other services | 2024 |
| Fine Feathers Ltd | Wholesale & retail | 2003 |
| Finish Line Logistics Ltd | Transport & logistics | 2020 |
| Finish Line Storage Ltd | Transport & logistics | 2023 |
| Finlaystown Properties Limited | Real estate | 2024 |
| Finmaris Projects Ltd | Professional & scientific | 2015 |
| Fire Risk Consultants Ltd | Administrative & support | 2023 |
| Fire-Protec Ireland Limited | Construction | 2015 |
| Firecert Ltd | Construction | 2010 |
| Firetec (Ireland) Ltd | Construction | 2003 |
| First Chapter Company Limited - the | Real estate | 1991 |
| First Class Furniture (Ballymena) Ltd | Wholesale & retail | 2024 |
| First Premier Properties Ltd | Real estate | 2019 |
| Fitzsimons Optical Limited | Wholesale & retail | 2023 |
| FK Cars and Commercials Limited | Wholesale & retail | 2021 |
| FK Projects Ltd | Financial services | 2020 |
| Flash Competitions Ltd | Wholesale & retail | 2026 |
| Flash in the PAN Bushmills Limited | Hospitality | 2014 |
| Flash in the PAN Ltd | Real estate | 1999 |
| Flash Outside Catering Limited | Hospitality | 2014 |
| Fleck Concrete Limited | Real estate | 1981 |
| Fleetcool Refrigeration Limited | Manufacturing | 2014 |
| Flexible Finance Ltd | Wholesale & retail | 2008 |
| Floored.Online Limited | Wholesale & retail | 2022 |
| Flotec (N.I.) Limited | Construction | 2019 |
| Flu-Plu Ltd | Wholesale & retail | 2015 |
| Flying on Social Media Limited | Professional & scientific | 2016 |
| FM Electrics Limited | Construction | 2026 |
| FMK Architecture Limited | Professional & scientific | 2011 |
| FMS Capital | Professional & scientific | 2023 |
| FOM Holdings Ltd | Financial services | 2023 |
| Foodservice 101 Limited | Financial services | 2024 |
| Foodservice Holdings Limited | Financial services | 2022 |
| Foodservice Support Solutions (N.I.) Limited | Administrative & support | 2009 |
| Forest Management Services Ltd | Agriculture & fishing | 2026 |
| Formula Management Services Ltd | | 1996 |
| Fort Eden Limited | Construction | 2014 |
| Foundraze Ltd | Administrative & support | 2024 |
| Fountain Street Trading Ltd | Hospitality | 2025 |
| Foxmount Properties Limited | Real estate | 2026 |
| Foxton Wood Management Company Limited | Households | 2018 |
| Fractional Advisory Limited | Professional & scientific | 2026 |
| Francey Homes Limited | Construction | 2006 |
| Freary Enterprises Limited | Administrative & support | 1993 |
| French Design Studios Ltd | Professional & scientific | 2023 |
| Frews Chippy Ltd | Hospitality | 2014 |
| Friends of Glenariffe | Arts & recreation | 2011 |
| Friends of Vispa | Other services | 2013 |
| Frydays Chip Shop (Clady) Limited | Wholesale & retail | 2020 |
| Fuel Events | Arts & recreation | 2009 |
| Funerals N.I. Limited | Other services | 2008 |
| Furbies Doggy Daycare Limited | Other services | 2021 |
| Fuse Energy Supply NI Limited | Energy | 2024 |
| Fusion Pipeline Services Ltd | Construction | 2025 |
| Future Belfast Limited | Professional & scientific | 2022 |
| G Kennedy and Sons Ltd | Wholesale & retail | 2024 |
| G O'Kane Builders Ltd | Construction | 2016 |
| G&C Pubs Limited | Hospitality | 2016 |
| Galdanagh Farms Ltd | Agriculture & fishing | 2023 |
| Galdanagh Transport Limited | Transport & logistics | 2012 |
| Galgorm Accountancy Ltd | Professional & scientific | 2023 |
| Galgorm and Gracehill Management Ltd | Real estate | 2023 |
| Galgorm Catering & Hygiene Supplies | Manufacturing | 2023 |
| Galgorm Estates Limited | Hospitality | 2015 |
| Galgorm Flowers Ltd | Wholesale & retail | 2026 |
| Galgorm Group | Wholesale & retail | 2019 |
| Galgorm Holdings Limited | Financial services | 2019 |
| Galgorm Homes Limited | Construction | 2021 |
| Galgorm Hygiene | Wholesale & retail | 1976 |
| Galgorm Meats Limited | Wholesale & retail | 2014 |
| Galgorm Renewables Limited | Energy | 2012 |
| Galgorm Tax Ltd | Professional & scientific | 2021 |
| Galgorm Waste Solutions Ltd | Water & waste | 2026 |
| Gallaher Corporate Trustee Limited | Professional & scientific | 2016 |
| Gamble Port Ltd | Real estate | 2019 |
| Gamore Foods Ltd | Wholesale & retail | 2019 |
| Garage Door Systems Limited | Manufacturing | 1994 |