| Eureka Studio Ltd | Wholesale & retail | 2018 |
| Euromech Limited | Professional & scientific | 2018 |
| Eustace and Company Limited | Financial services | 1999 |
| Evans & Chambers Properties Ltd | Real estate | 2024 |
| Evans Group Ltd | Wholesale & retail | 2025 |
| Evans Plumbing Limited | Administrative & support | 2016 |
| Even Keel at Home Ltd | Extraterritorial | 2019 |
| Eventeem Limited | Administrative & support | 2013 |
| Ever Trend Ltd | Wholesale & retail | 2025 |
| Everplass Plastics Ltd | Construction | 2013 |
| EX Cathedra Solutions Limited | Information & communication | 2013 |
| Executive Coaching 365 Limited | Information & communication | 2018 |
| Exodus Services Limited | Administrative & support | 2024 |
| Expercare Ltd | Health & social care | 2024 |
| Expert Repairs Ltd | Manufacturing | 2015 |
| Express Taxi Rental Limited | Transport & logistics | 2022 |
| Express Welding & Engineering Limited | Administrative & support | 2003 |
| EYE for the Detail Ltd | Professional & scientific | 2025 |
| Fablas Ice Cream Limited | Hospitality | 2016 |
| Fabmec Limited | Manufacturing | 1987 |
| Facade Inc Ltd | Construction | 2025 |
| Facilitate Group Ltd | Administrative & support | 2022 |
| Fair Brand Limited | Information & communication | 2025 |
| Fairlight Dental Practice Limited | Health & social care | 2010 |
| Fairway Fashion Ltd | Wholesale & retail | 2023 |
| Family Foods Barry Limited | Hospitality | 2025 |
| Family Kebab and Pizza Limited | Hospitality | 2026 |
| Fancy Pizza Barry Ltd | Hospitality | 2019 |
| Fancy Pizza Ltd | Hospitality | 2025 |
| Fast SYS Limited | Manufacturing | 2024 |
| Fastfoodbarry Ltd | Hospitality | 2019 |
| FAT Boys Takeaway Limited | Hospitality | 2018 |
| Fawcett Fabrications Ltd | Construction | 2024 |
| FDA SA Homes Limited | Hospitality | 2025 |
| Ffilmiau Mynydd HUD Magic Mountain Films Limited | Information & communication | 2021 |
| Fieldgold Limited | Professional & scientific | 2013 |
| Finanvo Ltd | Professional & scientific | 2019 |
| Fire & Safety Services (UK) Limited | Professional & scientific | 2004 |
| First Choice Commissioning Limited | Professional & scientific | 2008 |
| First Class Lawn Care & Maintence Limited | Administrative & support | 2025 |
| First Steps Playgroups (Cardiff) Limited | Education | 2010 |
| Fit to Talk Ltd | Education | 2023 |
| FITAMINS24 Limited | Wholesale & retail | 2026 |
| Five Feng Properties Limited | Real estate | 2022 |
| Flame N Grate Services Limited | Manufacturing | 2008 |
| Flavour UP Ltd | Hospitality | 2026 |
| Flutux Studio Ltd | Information & communication | 2026 |
| FLY Air Wales CYF | Administrative & support | 2026 |
| Focussed Limited | Education | 1997 |
| Folding Rock Ltd | Information & communication | 2024 |
| Fonmon Court Limited | Households | 2006 |
| Fontygary Inn Limited | Hospitality | 2007 |
| Food for Thought (Delicatessen) Limited | Wholesale & retail | 1983 |
| Food for Thought 2 Ltd | Financial services | 2011 |
| FOR One Group Ltd | Real estate | 2025 |
| Forcatious Limited | Information & communication | 2012 |
| Forde Site Services Ltd | Construction | 2026 |
| Fortem & Mode Limited | Administrative & support | 2019 |
| Fortress Financial Services Limited | Financial services | 2019 |
| Four Paws Cattery Ltd | Agriculture & fishing | 2021 |
| Fowler Media Limited | Information & communication | 2019 |
| FOX & Hill Property Limited | Real estate | 2026 |
| FP Management Systems Limited | Professional & scientific | 2015 |
| Fradilles Limited | Hospitality | 2024 |
| Frame 2000 (UK) Limited | Construction | 2005 |
| Frazer Ashton Ltd | Administrative & support | 2023 |
| Fresh Faced Marketing Limited | Professional & scientific | 2022 |
| Freshcup Limited | Wholesale & retail | 2002 |
| Fretko Ltd | Information & communication | 2021 |
| From the Horse's Mouth Ltd | Professional & scientific | 2022 |
| Front Room Hospitality Limited | Hospitality | 2023 |
| Front ROW Properties Management Limited | Households | 2018 |
| Frozen Rainbows Limited | Wholesale & retail | 2022 |
| Fryer Tuck Mario Limited | Hospitality | 2021 |
| FSB Properties Ltd | Real estate | 2019 |
| Fsproperty Limited | Real estate | 2016 |
| FTJ Investments Ltd | Real estate | 2017 |
| Fulcrum Property Management & Repairs Limited | Construction | 2023 |
| Funky Bunny Ltd | Wholesale & retail | 2021 |
| Funky Monkey (Barry) Ltd | Wholesale & retail | 2024 |
| Fusion Five Developments Limited | Real estate | 2018 |
| Future State Transformation Limited | Professional & scientific | 2026 |
| G & C Pharma Limited | Wholesale & retail | 2016 |
| G FORCE2 Ltd | Construction | 2025 |
| G Wood Flooring Limited | Construction | 2008 |
| G&T Investment Properties Ltd | Real estate | 2025 |
| G. S. Consultancies Ltd | Education | 2026 |
| G.J.Binding & Sons (Holdings) Ltd | Financial services | 2025 |
| G.J.Binding & Sons Limited | Transport & logistics | 2009 |
| G30 Digital Ltd | Information & communication | 2018 |
| G9 Fish Bar Ltd | Hospitality | 2009 |
| Gallus Services Ltd | Wholesale & retail | 2024 |
| Gaming Squad Ltd | Other services | 2022 |
| Gammell Antiques Ltd | Wholesale & retail | 2022 |
| Garden Grow Limited | Administrative & support | 2015 |
| Garden Services Swansea Limited | Administrative & support | 2011 |
| Gareth Morgan Consultancy Ltd | Education | 2014 |
| Gareth R Morris Hearing Ltd | Health & social care | 2014 |
| Garland and Hughes Ltd | Professional & scientific | 2026 |
| Gary Dunsford Consulting Ltd | Professional & scientific | 2023 |