| Quill Assets LLP | | 2024 |
| Quill Remote Overseas Ownership Structures (Roost) LLP | | 2024 |
| Quill Wills Limited | Professional & scientific | 1990 |
| Quills UNI LLP | | 2025 |
| R B Jones Ltd | Manufacturing | 2016 |
| R C Davies CYF | Agriculture & fishing | 2025 |
| R T & a M Ellis CYF | Agriculture & fishing | 2009 |
| R W Roberts & SON (Funeral Directors) Limited | Other services | 2012 |
| Recoparts Ltd | Wholesale & retail | 2023 |
| Rectory Green Conservation Limited | Real estate | 2002 |
| Red Kite Customs Clearance Ltd | Transport & logistics | 2022 |
| Red Shed Seven Ltd | Other services | 2020 |
| Redpro Residential Limited | Real estate | 2023 |
| Relth Ltd | Real estate | 2017 |
| RF Global Services Limited | Information & communication | 2009 |
| Rheith Limited | Professional & scientific | 2025 |
| Rights: Community: Action Ltd | Professional & scientific | 2019 |
| Rinky Dinky DOO Limited | Construction | 2016 |
| RO & EG Morris CYF | Construction | 2010 |
| Roberts Metal Finishing Limited | Wholesale & retail | 2022 |
| Rogers Roofing & Home Improvements Ltd | Construction | 2021 |
| Roost 219 Control LLP | | 2024 |
| Roost 220 Control LLP | | 2024 |
| Roost 229 Control LLP | | 2024 |
| Roost 230 Control LLP | | 2024 |
| Roost 249 Control LLP | | 2025 |
| Roost Secretary LLP | | 2021 |
| Rossi Family Control LLP | | 2024 |
| Rowlands Logistics Limited | Transport & logistics | 2024 |
| ROY Choudhury Family LLP | | 2005 |
| Royles Property Investments Ltd | Financial services | 2025 |
| RSJ Denbighshire Brickworks Limited | Construction | 2022 |
| S and G Plant Ltd | Administrative & support | 2024 |
| S M R Trade Services Ltd | Construction | 2019 |
| S&M Son's Ltd | Real estate | 2024 |
| S.Bash Barber Ltd | Other services | 2025 |
| Saas Traders Ltd | Hospitality | 2024 |
| Sail Internal Audit Limited | Professional & scientific | 2022 |
| Sales Geek North Wales Ltd | Professional & scientific | 2021 |
| Salt Mine Ltd | Real estate | 2026 |
| Sandplace Projects Limited | Construction | 2022 |
| Sani Family Holding LLP | | 2025 |
| SB Kurdish Barber Ltd | Other services | 2023 |
| Scansure Ltd | Manufacturing | 2025 |
| Schema Therapy Systems Ltd | Professional & scientific | 2020 |
| Scpqs Ltd | Professional & scientific | 2023 |
| Seed to Science Limited | Wholesale & retail | 2019 |
| Segrwyd ISA Farm Ltd | Agriculture & fishing | 2025 |
| Segrwyd Limited | Real estate | 2021 |
| Seictec Limited | Information & communication | 2018 |
| Sentinel Will Storage and Probate Services Limited | Administrative & support | 2008 |
| Sepia Projects Limited | Professional & scientific | 2013 |
| Sepia Properties Limited | Real estate | 2015 |
| Serekinti Limited | Real estate | 2011 |
| Shaws Home and Retail Ltd | Wholesale & retail | 2023 |
| Shorecliffe Training Limited | Education | 1998 |
| Simply Excellence Limited | Administrative & support | 2014 |
| Siop Y Llan CYF | Wholesale & retail | 2025 |
| SK Contracting (North Wales) Ltd | Construction | 2025 |
| Skyarb CYF | Professional & scientific | 2022 |
| Skyline Electrical Ltd | Construction | 2007 |
| Skyline Solar Systems Ltd | Other services | 2024 |
| Skyrocket Training Limited | Professional & scientific | 2010 |
| Smart Energi Ltd | Other services | 2021 |
| Smartpractice CC LLP | | 2012 |
| Snaithquarters Ltd | Real estate | 2025 |
| So-Safe (Europe) Limited | Extraterritorial | 1998 |
| Soapy Carpet Ltd | Real estate | 2015 |
| Sonarc Ventures Limited | Wholesale & retail | 2022 |
| Sophisticat Design Limited | Professional & scientific | 2010 |
| Soveta Property Limited | Real estate | 2023 |
| Specialist Engineering Technical Services Ltd | Construction | 1997 |
| SR Heating & Plumbing (NW) Limited | Construction | 2021 |
| ST Davids Developers Limited | Construction | 2017 |
| ST. Quintin & Mcconnell (Lettings) Limited | Real estate | 2002 |
| St.Brigid's School Limited | Education | 1991 |
| St.Davids Care Limited | Health & social care | 2007 |
| Stables Yard Management Company Limited | Households | 2004 |
| Stad Jones Ltd | Real estate | 2023 |
| Staysud Limited | Real estate | 2022 |
| Storm Power Ltd | Manufacturing | 2011 |
| Studiomade Creative Ltd | Arts & recreation | 2022 |
| Sumlii LLP | | 2025 |
| Supportlend Construction Limited | Administrative & support | 2025 |
| T W & G W Evans Limited | Agriculture & fishing | 2006 |
| Take Stock Van Hire Limited | Administrative & support | 2007 |
| Tanabe MMV International Limited | Information & communication | 2005 |
| Target Consultants Limited | Extraterritorial | 2022 |
| THE Association of Lawyers and Legal Advisors | Professional & scientific | 1996 |
| THE Dash Doctor Ltd | Wholesale & retail | 2024 |
| THE Denbighshire and Flintshire Agricultural Society Limited | Other services | 2001 |
| THE Feminine Connection Limited | Professional & scientific | 2021 |
| THE Khan (Senghennydd) Property Rental LLP | | 2024 |
| THE Llindir Inn Ltd | Hospitality | 2023 |
| THE Quill Group Company Secretary LLP | | 2005 |
| THE Rock Project Limited | Education | 2007 |
| THE Staging Experts Limited | Other services | 2024 |
| THE Swedish Penguin Ltd | Wholesale & retail | 2020 |
| THE Typing Works Limited | Administrative & support | 2009 |
| THE Vlogfest Limited | Administrative & support | 2017 |