| Ojeengineer Ltd | Professional & scientific | 2022 |
| Orangehat.Dev Limited | Professional & scientific | 2025 |
| Owain Bebb A'I Gwmni Cyfyngedig | Professional & scientific | 2014 |
| Owain FÔN Williams Ltd. | Arts & recreation | 2016 |
| Owain Orwig CYF | Manufacturing | 2019 |
| Owen Electrical Contractors GC Limited | Construction | 2017 |
| P James Estates Ltd | Real estate | 2024 |
| P&M Lets Ltd | Hospitality | 2026 |
| P. P. M. Limited | Manufacturing | 2000 |
| P.E.P Construction Ltd | Construction | 2023 |
| Padarn Hotel Limited | Hospitality | 2016 |
| Palace Cebab Ltd | Hospitality | 2025 |
| Pant-Du CYF | Hospitality | 2012 |
| Parabl CYF | Professional & scientific | 2004 |
| Paraderace Consultancy Limited | | 1994 |
| Parallel Coaching Ltd | Education | 2013 |
| Paravision Ltd | Information & communication | 2013 |
| Parstone Ltd | Mining & quarrying | 2020 |
| Paul Focus Ltd | Information & communication | 2015 |
| Paul’S Easy FIX Ltd | Manufacturing | 2021 |
| PD Weddings Ltd | Administrative & support | 2026 |
| Peblig Garage Ltd | Wholesale & retail | 2019 |
| Peirianneg DRW Engineering CYF | Professional & scientific | 2019 |
| Peisley Asset Management CYF | Real estate | 2026 |
| PEN CEI Ltd | Hospitality | 2021 |
| PEN Solar CYF | Construction | 2023 |
| PEN Y Buarth CYF. | Hospitality | 2023 |
| Penrallt CYF | Wholesale & retail | 2018 |
| Penseiri Elinor Gray-Williams Ltd | Professional & scientific | 2019 |
| Penygroes Grill & Pizzeria Ltd | Hospitality | 2025 |
| Penygroes Tandoori Limited | Hospitality | 2011 |
| Peregrine & Wren Limited | Construction | 2026 |
| Perry’S Gym Caernarfon Ltd | Arts & recreation | 2022 |
| Perthi Holiday Cottages Ltd | Hospitality | 2025 |
| Pete's Eats Ltd | Hospitality | 2007 |
| Pete's Locksmith & Access Control Services Ltd | Administrative & support | 2018 |
| Pete's Sleeps Ltd | Hospitality | 2026 |
| Pharmore Interiors Limited | Transport & logistics | 2013 |
| Phoenix Autobody Ltd | Wholesale & retail | 2023 |
| Phoenix ERP Limited | Information & communication | 2018 |
| Phones Repair Centre Ltd | Wholesale & retail | 2024 |
| Phytorigins Ltd | Professional & scientific | 2012 |
| Phytovation Limited | Manufacturing | 2004 |
| PI Engineering and Technology Ltd | Professional & scientific | 2014 |
| Piggery Pottery Ltd | Manufacturing | 2006 |
| Piggery Pottery Mail Order Ltd | Wholesale & retail | 2022 |
| Pitian Patian Llanwnda CYF | Health & social care | 2012 |
| Pixy Maps CYF. | Information & communication | 2022 |
| Pizza Mazi Ltd | Hospitality | 2025 |
| Plas Gwylan Limited | Hospitality | 2019 |
| Plas Properties Ltd | Construction | 2021 |
| Platinum Holdings Manchester Limited | Financial services | 2016 |
| PMA Caernarfon Ltd | Education | 2023 |
| Popeth Limited | Wholesale & retail | 2024 |
| PR Joinery & Building Ltd | Construction | 2019 |
| Prestige Car Care (MON) Limited | Wholesale & retail | 2015 |
| Pride Expeditions Ltd | Administrative & support | 2016 |
| Pritchard Jones Lane LLP | | 2011 |
| Professional Fitness Solutions Ltd | Arts & recreation | 2005 |
| Proline (Cymru) Ltd | Health & social care | 2014 |
| Protec Physio Limited | Health & social care | 2021 |
| PSR Controls Ltd | Construction | 2020 |
| Purrfect Escapes Ltd | Agriculture & fishing | 2025 |
| PWG Construction Ltd | Construction | 2026 |
| Pwyllgor Pentra Deiniolen CIC | Administrative & support | 2024 |
| R Tung Food Ltd | Hospitality | 2019 |
| R. & I. Jones Limited | Wholesale & retail | 1989 |
| R.Edwards Cleaning Services Ltd | Administrative & support | 2023 |
| R.H. Domagala Limited | Health & social care | 2021 |
| Radde Ltd | Professional & scientific | 2016 |
| Radiant Moon Audio Ltd | Information & communication | 2009 |
| RAS Ryngwladol YR Wyddfa International Snowdon Race | Administrative & support | 2011 |
| Rauni Higson Silver Ltd | Manufacturing | 2014 |
| RAW Adventures Expeditions Limited | Administrative & support | 2018 |
| RAW Adventures Mountain Activities Ltd | Administrative & support | 2010 |
| RAY Wood Photography Ltd. | Professional & scientific | 2000 |
| Reach IT North Wales Limited | Administrative & support | 2024 |
| Red Axis Design Studio Limited | Professional & scientific | 2025 |
| Red Dragon Ebikes Limited | Wholesale & retail | 2023 |
| Redpony Analytics Ltd | Professional & scientific | 2024 |
| Rehoboth Haven Care Limited | Health & social care | 2024 |
| Rejuva Lift Ltd | Manufacturing | 2025 |
| Renan Olisco Limited | Health & social care | 2023 |
| Renewables Project Services Ltd | Professional & scientific | 2022 |
| Renovo Aesthetics Ltd | Other services | 2015 |
| RGO Holdings Limited | Financial services | 2017 |
| RH Cleaning Solutions Ltd | Administrative & support | 2026 |
| Rhandai Penrallt Apartments Limited | Households | 2003 |
| Rheilffordd Llyn Padarn Cyfyngedig | Transport & logistics | 1977 |
| Rheoli Eiddo Caledffrwd Property Management CYF | Real estate | 2026 |
| Rhys Iorwerth CYF. | Professional & scientific | 2016 |
| Richards Caffi Maes CYF | Hospitality | 2018 |
| Ride IT OUT Ltd | Information & communication | 2019 |
| Rirox Ltd | Construction | 2026 |
| RJS Scaffolding Limited | Construction | 1988 |
| RN Technical Support Ltd | Professional & scientific | 2025 |
| Roberts of Port Dinorwic Holdings Limited | Professional & scientific | 2025 |
| Roberts of Port Dinorwic Limited | Manufacturing | 1985 |
| Robin Williams Cyfyngedig | Education | 2016 |
| Rondo Media CYF | Information & communication | 2008 |