| Nipaluna Homes Ltd | Real estate | 2026 |
| NK Nelson Kebab Ltd | Hospitality | 2024 |
| North Revival Ltd | Real estate | 2017 |
| Northrise Carpenters & Builders Limited | Manufacturing | 2019 |
| Novenog Limited | Professional & scientific | 2004 |
| Oddl Ltd | Information & communication | 2018 |
| OM Shreem Group Ltd | Other services | 2018 |
| Oteq Development Ltd | Construction | 2019 |
| Padel Yard Holdings Ltd | Wholesale & retail | 2025 |
| Pantanas Holdings LLP | | 2021 |
| Parkwood Garden Services Ltd | Administrative & support | 2026 |
| Paul Inward Limited | Transport & logistics | 2025 |
| PAY Weekly Carpets Flooring and More Ltd | Wholesale & retail | 2020 |
| PB Engineering Limited | Manufacturing | 2003 |
| Perrott Street Garage Ltd | Wholesale & retail | 2024 |
| PFF Cars Limited | Wholesale & retail | 2019 |
| Phillips Property Finance Ltd | Financial services | 2021 |
| Pili-Pala Property Management Ltd | Real estate | 2024 |
| Pixelvault AI Limited | Wholesale & retail | 2025 |
| Platypus Construction Group Limited | Construction | 2024 |
| PLG Garage Services Ltd | Wholesale & retail | 2025 |
| Plra Consulting Ltd | Administrative & support | 2023 |
| PMP Designs Ltd | Professional & scientific | 2009 |
| POA Accountancy Ltd | Professional & scientific | 2025 |
| Poppybuild Developments Ltd | Construction | 2026 |
| Priva-Cy Essentials Ltd | Information & communication | 2019 |
| Pro Tiling Wales & West Country Limited | Extraterritorial | 2019 |
| Quakers Yard Community Association | Arts & recreation | 2006 |
| Quillpoint Accountancy Services Ltd | Professional & scientific | 2016 |
| R & DT Properties Ltd | Real estate | 2019 |
| Railey Utilities Limited | Construction | 2012 |
| Rainbow Holdings Limited | Administrative & support | 1997 |
| RAP Roofing & Building Ltd | Construction | 2024 |
| Razvan Ltd | Information & communication | 2021 |
| RCA Group Holdings Ltd | Professional & scientific | 2025 |
| Red Ace Properties Ltd | Real estate | 2025 |
| Red Lime Group Ltd | Financial services | 2026 |
| RGE Holdings Ltd | Financial services | 2025 |
| Ride N Shine SW Ltd | Wholesale & retail | 2025 |
| Ridgeon Rail Solutions Ltd | Construction | 2017 |
| River MM Properties Limited | Real estate | 2026 |
| Rlsm Properties Ltd | Real estate | 2024 |
| Rosser Properties Limited | Real estate | 2004 |
| RS Brickwork Solutions Ltd | Construction | 2024 |
| S.M.T. Surveying & Civil Engineering Services Ltd | Construction | 2017 |
| Sbds Aviation Ltd | Manufacturing | 2025 |
| SC Aesthetics and Sunbeds Ltd | Other services | 2022 |
| SD Sprinklers Limited | Construction | 2024 |
| Senw Plumbing & Heating Ltd | Construction | 2020 |
| Serban Accounting Ltd | Professional & scientific | 2020 |
| SGG Mechanical & Electrical Ltd | Professional & scientific | 2020 |
| Shams Stores Limited | Wholesale & retail | 2020 |
| Shawfix Contractors Ltd | Construction | 2021 |
| Shinigami Valley Ltd | Wholesale & retail | 2022 |
| Siteline Civils Limited | Construction | 2013 |
| Siteline Civils SW Limited | Construction | 2022 |
| Siwgr N Sbeis Ltd | Wholesale & retail | 2025 |
| Skateboard Academy UK Limited | Education | 2019 |
| Slate Audio Ltd | Manufacturing | 2016 |
| Smarter Holdings Limited | Households | 2024 |
| Smerdon Farming Services (SFS) Limited | Agriculture & fishing | 2015 |
| Smerdon Holdings Limited | Professional & scientific | 2015 |
| Smerdon Hospitality Services (SHS) Limited | Hospitality | 2015 |
| Smerdon Properties Limited | Financial services | 2020 |
| Smerdon Tree Services (STS) Limited | Agriculture & fishing | 2003 |
| Social Studio Marketing Ltd | Professional & scientific | 2024 |
| Solere Ltd | Administrative & support | 2018 |
| Sophic Business Solutions Ltd | Information & communication | 2016 |
| South Wales Cleaning Services Limited | Administrative & support | 2019 |
| Specialised Hygienist Services Ltd | Health & social care | 2026 |
| Steve Kelland Plumbing & Heating Limited | Construction | 2012 |
| Stoves World Ltd | Other services | 2016 |
| Strongdads CIC | Professional & scientific | 2025 |
| SU Commerce Hub Ltd | Wholesale & retail | 2026 |
| Sundae Surveying Services Ltd | Professional & scientific | 2025 |
| SW Aero Holdings Ltd | Wholesale & retail | 2021 |
| SW Jetting Services Limited | Construction | 2024 |
| Swifty Developments Ltd | Real estate | 2025 |
| Symes Studio's Limited | Administrative & support | 2015 |
| T3 Properties Ltd | Real estate | 2025 |
| Taff Bargoed Development Trust Limited | Health & social care | 1994 |
| Tastyz Dessert Shop Ltd | Hospitality | 2025 |
| Tax Relax Ltd | Professional & scientific | 2018 |
| TCG Facilities Ltd | Administrative & support | 2020 |
| Terelec Technologies Ltd | Wholesale & retail | 2026 |
| THE Angel Inn Ltd | Hospitality | 2021 |
| THE Dan-Y-Graig PUB Limited | Hospitality | 2026 |
| THE Duelling Grounds Ltd | Wholesale & retail | 2026 |
| THE Glantaff Inn Limited | Hospitality | 2017 |
| THE Gym in Treharris Ltd | Arts & recreation | 2025 |
| THE Old Drift Wellness Ltd | Health & social care | 2025 |
| Thornacre Ltd | Agriculture & fishing | 2014 |
| Three Amigo Homestays Ltd | Hospitality | 2023 |
| Time for YOU (Newport) Cleaning Ltd | Administrative & support | 2007 |
| TIN Sang Ltd | Hospitality | 2025 |
| TKE Homes CIC | Hospitality | 2024 |
| TKE Living CIC | Households | 2026 |
| Tlsilcockpropertys Ltd | Real estate | 2025 |
| Tomat Limited | Wholesale & retail | 2011 |
| Tonteg Consultancy Limited | Professional & scientific | 2020 |