| Prestige Property Management (NW) Limited | Real estate | 2013 |
| Prime Location Management Company Limited | Real estate | 1995 |
| Princes Gate East Liverpool Feehold Ltd | Households | 2022 |
| Princes Gate East Management Company Ltd | Households | 2015 |
| Prior Studio Limited | Professional & scientific | 2021 |
| Promix (NW) Limited | Construction | 2015 |
| Punterdigital Limited | Information & communication | 2018 |
| PWR Properties Ltd | Real estate | 2006 |
| Quayside Inns Limited | Hospitality | 2015 |
| Quidos AI Limited | Financial services | 2025 |
| Quidos Plus Limited | Information & communication | 2024 |
| Quidos Pure Limited | Information & communication | 2024 |
| Quidos Technologies Limited | Information & communication | 2010 |
| R.S. Bleakley Limited | Extraterritorial | 1990 |
| R.T.A. Associates Limited | Professional & scientific | 2010 |
| Real Insight Limited | Real estate | 2002 |
| Remote Horizon Ltd | Public administration | 2022 |
| Renegade Climbing Ltd | Manufacturing | 2019 |
| Rhodfa Llywelyn Management Company Limited | Real estate | 2005 |
| Rhos Marina Limited | Extraterritorial | 2018 |
| Rhos Marine Limited | Extraterritorial | 2018 |
| Rhoslan Management Company Limited | Households | 2003 |
| Rhosyn Management Company Limited | Households | 2004 |
| Rjvn Ltd | Professional & scientific | 2021 |
| ROB Loves Gardens Ltd. | Administrative & support | 2017 |
| Robert Meakes Associates Limited | Information & communication | 1997 |
| Robertson Geologging Limited | Manufacturing | 1986 |
| Robinhamer Limited | Professional & scientific | 2007 |
| Royal Cambrian Academy of Art | Arts & recreation | 1951 |
| S Bailey Rope Access Ltd | Manufacturing | 2025 |
| Saer Architects Limited | Professional & scientific | 2021 |
| Saer LYS (Mount Street) Flats Management Limited | Households | 1992 |
| Salsbury Developments Limited | Real estate | 2023 |
| Samuel Chambers Ltd | Transport & logistics | 2025 |
| SB Lawn&Hedge Care Limited | Administrative & support | 2026 |
| SD Propinvest Ltd | Real estate | 2019 |
| Seas the Opportunity Ltd | Professional & scientific | 2026 |
| Sentro Properties Ltd | Real estate | 2017 |
| Shamrock Court (Deganwy) Limited | Households | 1965 |
| Sharon Smith Properties Ltd | Real estate | 2015 |
| Siguard Security Limited | Administrative & support | 2024 |
| Siop WYN CYF | Manufacturing | 2019 |
| Slhh Property SPV03 Ltd | Real estate | 2025 |
| Slhh Property SVP02 Ltd | Real estate | 2024 |
| Smoulder Properties Ltd | Construction | 2022 |
| Spark Hypnotherapy Limited | Extraterritorial | 2018 |
| Spark Training Limited | Administrative & support | 2007 |
| Spark Wellness Limited | Extraterritorial | 2020 |
| Spice Safari NW Ltd | Hospitality | 2025 |
| Spillane & Co. Wealth Management Ltd | Financial services | 2005 |
| Spurbase Limited | Households | 1986 |
| Squiggly Production Ltd | Professional & scientific | 2025 |
| SR Security Limited | Administrative & support | 2016 |
| ST Cole Properties Limited | Real estate | 2025 |
| ST. Trillos Court Residents Association Limited | Real estate | 2002 |
| Stands OUT Holdings Ltd | Financial services | 2026 |
| Stands OUT Properties Ltd | Real estate | 2026 |
| Starting Line Limited | Professional & scientific | 1998 |
| Stay, Go, Diversify! Limited | Information & communication | 2018 |
| STC Renewables Limited | Construction | 2024 |
| Steambio Technologies Ltd | Professional & scientific | 2025 |
| Steve Barrett Heating and GAS Services Ltd | Construction | 2021 |
| Steve Wall (Developments) Limited | Construction | 2001 |
| Storetex Limited | Hospitality | 2004 |
| Stormi Ltd | Professional & scientific | 2024 |
| Strange-Pritchard Limited | Wholesale & retail | 2023 |
| Stratthorpe Constable Works Ltd | Manufacturing | 2021 |
| Stuck Coaching Limited | Professional & scientific | 2026 |
| Studio Pendragon Ltd | Arts & recreation | 2020 |
| Studious Investments Ltd. | Real estate | 2017 |
| Summer Camps International Limited | Arts & recreation | 2007 |
| Sumners Caterers Limited | Real estate | 1952 |
| Sunny Shores Management Company Limited | Real estate | 2006 |
| Surf Rider Conwy Ltd | Wholesale & retail | 2012 |
| Swainson Electrical Contractors Ltd | Construction | 2020 |
| Swift Building Solutions Ltd | Administrative & support | 2023 |
| Taganrog Properties Limited | Administrative & support | 1999 |
| TAL Seven LLP | | 2014 |
| Taleight Limited | Real estate | 2015 |
| Tarannau Film Limited | Information & communication | 2016 |
| Taters (NW) Ltd | Hospitality | 2026 |
| Tax 4 U Limited | Professional & scientific | 1996 |
| TCH Projects Ltd | Construction | 2024 |
| Tea-Tree Limited | Wholesale & retail | 1991 |
| TECH992 Ltd | Information & communication | 2025 |
| Technical Infrastructure Management Limited | Information & communication | 2007 |
| Techstapler Ltd | Administrative & support | 2023 |
| Teejay's Bookkeeping Services Ltd | Professional & scientific | 2016 |
| Tegwen Williams CYF | Professional & scientific | 2005 |
| Thalassanoire Ltd | Wholesale & retail | 2025 |
| THE Clemence Restaurant Limited | Hospitality | 1997 |
| THE Clovelly Ltd | Hospitality | 2026 |
| THE Conwy Bakery Limited | Manufacturing | 2017 |
| THE Conwy Sweet Shop Limited | Wholesale & retail | 2019 |
| THE Escape Artists (North Wales) CIC | Arts & recreation | 2014 |
| THE Highways Flats Limited | Real estate | 2009 |
| THE HRH Motor Company Limited | Professional & scientific | 2015 |
| THE Jackdaw Conwy Ltd | Hospitality | 2021 |
| THE Laurels Management Company (Llanrwst Road) Limited | Other services | 2012 |
| THE Learning Business Limited | Education | 1999 |