| A K Developments Anglesey Ltd | Construction | 2002 |
| A.Specms Limited | Construction | 2015 |
| Abzyma Ltd | Professional & scientific | 2025 |
| Anglesey Auto Locksmith Ltd | Wholesale & retail | 2021 |
| Anglesey Country Cottages Limited | Households | 2013 |
| Anglesey Herbs Limited | Agriculture & fishing | 2020 |
| Anglesey Spring / DWR Ffynnon MON / DWR MON Ltd | Manufacturing | 2015 |
| Azamm CYF | Hospitality | 2024 |
| Bridger Enterprises (UK) Limited | Wholesale & retail | 2012 |
| Cels Character Education & Life Skills Limited | Education | 2024 |
| CPC (NW) Ltd | Transport & logistics | 2018 |
| Creigar Management Limited | Real estate | 2016 |
| Cymuned Cels Community CIC | Education | 2024 |
| Focus Removals North Wales Ltd | Transport & logistics | 2017 |
| From Thistles and Weeds Ltd | Administrative & support | 2020 |
| Gorgeous Grass Ltd | Wholesale & retail | 2014 |
| Grenen Marine Research Ltd | Professional & scientific | 2025 |
| Headlines (Anglesey) Ltd. | Other services | 2003 |
| Horseback Management Ltd | Other services | 2009 |
| Ifan Hewitt Ltd | Administrative & support | 2026 |
| Inshore Clothing Ltd | Extraterritorial | 2021 |
| L Bell Construction Ltd | Construction | 2023 |
| L&D Properties Limited | Households | 2024 |
| Landeg CYF | Real estate | 2018 |
| Leisure Home Solutions Limited | Construction | 2015 |
| Lewis Fast Food Services Ltd | Wholesale & retail | 2016 |
| Lewis Forecourt Holdings Limited | Professional & scientific | 2017 |
| Lewis Property Developments Limited | Construction | 2004 |
| Mack Events Limited | Arts & recreation | 2014 |
| MIJ Joinery & Building Contractors Ltd | Construction | 2018 |
| Millbarn (Services) Limited | Administrative & support | 2013 |
| MON 4 X 4 Limited | Wholesale & retail | 2004 |
| MON Grass Limited | Administrative & support | 2018 |
| MRC Property and Building Services Ltd | Construction | 2017 |
| O'Neill Landscape and Groundworks (Anglesey) Ltd | Construction | 2024 |
| Pentraeth Caravans Limited | Wholesale & retail | 2003 |
| Pf&S Ltd | Construction | 2012 |
| Prysan Ltd | Construction | 2021 |
| RB Phoenix Europe Ltd | Administrative & support | 2014 |
| Saltwater Aquaculture Ltd. | Agriculture & fishing | 2005 |
| Shamrock RRT Limited | Construction | 2019 |
| Shaun Hughes Roofing Ltd | Construction | 2015 |
| Sortmyjob Ltd | Information & communication | 2026 |
| ST. David's Leisure Ltd | Hospitality | 1981 |
| Taihirion Storage Limited | Transport & logistics | 2017 |
| THE Sidings ( Pentraeth ) Management Company Ltd | Real estate | 2014 |
| TK M&C Ltd | Construction | 2024 |
| TK Masonry & Construction Ltd | Construction | 2022 |
| Tryfan Construction Ltd | Construction | 2025 |
| TY FRY Manor & Estate Ltd | Hospitality | 2021 |
| TY Mawr Properties Ltd | Hospitality | 2025 |
| Tyddyn Properties Ltd | Real estate | 2024 |