| Oceans Edge Restaurant Limited | Hospitality | 2021 |
| Open Sea Aquaculture LLP | | 2023 |
| Parkfield Grass Converters Limited | Agriculture & fishing | 2021 |
| Parry Business Solutions Limited | Professional & scientific | 2003 |
| Parys Mountain Mines Limited | Mining & quarrying | 1968 |
| Pathfinder Thirteen Limited | Wholesale & retail | 2017 |
| PED Engineering Services Ltd | Administrative & support | 2018 |
| Peninsula Windows Limited | Construction | 1984 |
| Pensieri Caravan Park Ltd | Hospitality | 2020 |
| Pensieri Limited | Agriculture & fishing | 1977 |
| Penultimate Properties Ltd | Households | 2024 |
| PH Grass Converters Limited | Agriculture & fishing | 2018 |
| Plas Garnedd Care Limited | Health & social care | 2005 |
| Porthladd Rhydd Ynys MÔN Limited | Administrative & support | 2024 |
| Positive Potions Limited | Agriculture & fishing | 2017 |
| Premier Late Shop Limited | Wholesale & retail | 2006 |
| Presaddfed Estate Limited | Hospitality | 1965 |
| Pritchard Brothers Limited | Construction | 2004 |
| Q Marketing & PR Limited | Professional & scientific | 2005 |
| Ravenspoint Films Ltd | Information & communication | 2023 |
| Red Boat Ltd | Wholesale & retail | 2010 |
| Red Wharf Developments Limited | Construction | 1990 |
| Red Wharf Property Management Limited | Households | 2019 |
| Red Wharf Systems Limited | Agriculture & fishing | 2001 |
| Rowen Limited | Administrative & support | 2016 |
| Russell-Hughes CYF. | Professional & scientific | 2005 |
| Sbjj Crown Bodedern Ltd | Hospitality | 2023 |
| Sbjj Group Ltd | Financial services | 2023 |
| Sebeva Investments Limited | Financial services | 2025 |
| Shear Ease Ltd | Manufacturing | 2003 |
| Silvercrown Trading Limited | Professional & scientific | 2004 |
| Simplifyr Ltd | Professional & scientific | 2016 |
| Snowdon Farms Limited | Agriculture & fishing | 1955 |
| Star Hand Car Wash and Valet Ltd | Other services | 2019 |
| Steel Export Limited | Construction | 2016 |
| Stermat Hardware (Gwynedd) Limited | Wholesale & retail | 1978 |
| Stuart Benson Pension Trustees Limited | Professional & scientific | 2020 |
| Sutton Express Food & Wine Ltd | Wholesale & retail | 2019 |
| Swift Windows Ltd | Construction | 2022 |
| Tebbutt Farms Limited | Agriculture & fishing | 1961 |
| Textile Developments (UK) Limited | Wholesale & retail | 2014 |
| THE Bodorgan Trust Company Limited | Real estate | 2005 |
| THE Fishing Warehouse Limited | Wholesale & retail | 2007 |
| THE Islander Magazine Limited | Information & communication | 2024 |
| THE Ucheldre Centre | Arts & recreation | 1991 |
| THE Wiltshire Horn Sheep Society Limited | Health & social care | 2008 |
| Thompson Russell Associates | | 1994 |
| TIR Enterprises Limited | Real estate | 2000 |
| Tregarnedd Fawr Main House Management Company 2022 Limited | Administrative & support | 2022 |
| Trisant Design Solutions Ltd | Agriculture & fishing | 2025 |
| Tropic Studio Ltd | Information & communication | 2020 |
| Turbine Transfers Limited | Transport & logistics | 2009 |
| TY Chwarel (2022) LLP | | 2024 |
| TY Mawr Farm Limited | Agriculture & fishing | 2018 |
| TYN Towyn Holidays Limited | Hospitality | 2025 |
| Tynlon Garage Limited | Wholesale & retail | 1987 |
| Valley Dental Limited | Other services | 2017 |
| W E Jones & Sons Limited | Construction | 2005 |
| W.E. Knees Limited | Construction | 1977 |
| Window Medic Ynys MON Limited | Construction | 2007 |
| Wonderfully Wild Limited | Administrative & support | 2014 |
| Xpose Media Ltd | Manufacturing | 2003 |