| 26B Coed Pella Road RTM Company | Administrative & support | 2011 |
| 311 Consulting Limited | Education | 2024 |
| 4 Crosses Construction Limited | Construction | 2004 |
| ABC Lettings & Sales Ltd | Real estate | 2009 |
| Absolutely Snow Limited | Administrative & support | 2013 |
| Acwila Ltd | Administrative & support | 2024 |
| Advanced Tech Marine Ltd | Manufacturing | 2022 |
| AJ Developments North Wales Limited | Construction | 2018 |
| Alex Thomas Plumbing & Heating Ltd | Manufacturing | 2015 |
| Alpha Maven Ltd | Information & communication | 2014 |
| Ammaterra Ltd | Health & social care | 2024 |
| Anglesey Boat Trips Limited | Transport & logistics | 2018 |
| Anglesey Choice Limited | Extraterritorial | 2006 |
| Anglesey Ultrasound Clinic Ltd | Health & social care | 2025 |
| Anka Hotels Limited | Hospitality | 1977 |
| Anomaly Group Holdings Ltd | Financial services | 2013 |
| Anomaly Interactive Limited | Administrative & support | 2011 |
| Argraig Associates Limited | Professional & scientific | 2023 |
| Assume Form Ltd | Professional & scientific | 2020 |
| Azzi Properties Ltd | Real estate | 2026 |
| B Atkinson Property Holdings Limited | Real estate | 2024 |
| Bangor High Street (Wales) Ltd | Real estate | 2024 |
| Barnacle & Broom Limited | Hospitality | 2025 |
| Bdsb Nominees | Arts & recreation | 1998 |
| Bert's KG Ltd | Hospitality | 2020 |
| Bilpar Ltd | Wholesale & retail | 2021 |
| Blasus MON Ltd | Hospitality | 2023 |
| Boomerang Recycling Limited | Manufacturing | 2015 |
| Borth Management Ltd | Real estate | 2021 |
| Box Van Burgers Ltd | Hospitality | 2023 |
| Bragdy Nonsens CYF | Manufacturing | 2023 |
| Brewood IT Services Limited | Information & communication | 2007 |
| Bridge Kebab Ltd | Hospitality | 2018 |
| Bulkeley Arms Menai Bridge Ltd | Hospitality | 2018 |
| Bulkeley Arms Ynys MON Limited | Hospitality | 2026 |
| Business Consulting International Services Ltd. | Administrative & support | 2010 |
| BVB Criccieth Ltd | Hospitality | 2025 |
| C G Jones Building Services Ltd | Construction | 2017 |
| Cadnant Construction and Agricultural Ltd | Construction | 2024 |
| Cadnant Construction Co Ltd | Construction | 2018 |
| Calon MÔN Properties Ltd | Construction | 2026 |
| Capsule Holiday Homes Ltd | Wholesale & retail | 2025 |
| Cariad Health Ltd | Information & communication | 2023 |
| Castle Fries Ltd | Hospitality | 2020 |
| Centreline Estates Limited | Real estate | 2020 |
| Centreline Modular Construction Limited | Manufacturing | 2020 |
| Cetocean Consultancy Ltd | Professional & scientific | 2017 |
| Chester Scan MAN Ltd | Health & social care | 2014 |
| Cinnamon of Menai Bridge Limited | Hospitality | 2011 |
| City Cars Liverpool Ltd | Transport & logistics | 2024 |
| Clare's Gourmet Kitchen Ltd | Extraterritorial | 2017 |
| Climbing Wall Services Ltd | Arts & recreation | 2011 |
| Climbinghabits Ltd | Education | 2025 |
| CLW Touring and Broadcast Ltd | Information & communication | 2021 |
| Code Awesome Ltd | Information & communication | 2018 |
| Cognition Research Ltd | Professional & scientific | 2016 |
| Consultnet Limited | Information & communication | 2002 |
| Cressida Designs Limited | Wholesale & retail | 2010 |
| Cromarwhite Limited | Manufacturing | 2012 |
| Cwmni Ty'N Cnwc PAC | | 2016 |
| Cybi Garage Limited | Wholesale & retail | 2007 |
| Cyfathreb CYF | Information & communication | 2024 |
| Cyfrifeg RH CYF | Professional & scientific | 2021 |
| D & N Jones Limited | Real estate | 2023 |
| D G Jones Dairy Ltd | Agriculture & fishing | 2023 |
| David Leyden Physiotherapy Limited | Health & social care | 2015 |
| Debruin Electrical Ltd | Construction | 2022 |
| DLW Plumbing & Heating NW Ltd | Construction | 2021 |
| Douglas Lang Limited | Professional & scientific | 2011 |
| Echology Ltd. | Professional & scientific | 2011 |
| Eco Power Anglesey Limited | Construction | 2024 |
| Edlin Williams Limited | Professional & scientific | 2007 |
| Effdee Development Limited | Education | 2023 |
| Egni Energy Solutions Ltd | Professional & scientific | 2025 |
| Empico Limited | Real estate | 2013 |
| ERW Gron (Bethesda) NO. 1 Management Company Limited | Households | 2005 |
| ESR Capital Holdings Ltd | Real estate | 2025 |
| Etincelle Ltd | Information & communication | 2011 |
| Eurach Parc Management Company Limited | Administrative & support | 2015 |
| Exit 23 Games Limited | Arts & recreation | 2018 |
| Exodus Cloud Technology Solutions Ltd | Information & communication | 2010 |
| Experts in Relocation Ltd | Hospitality | 2023 |
| Firestar Science and Technology Ltd. | Professional & scientific | 2014 |
| First Aesthetics Ltd | Health & social care | 2021 |
| Foundational Economy Alliance Wales Ltd | Other services | 2021 |
| Fron Heulog Management Limited | Households | 1991 |
| G.R. Hullock (1994) Ltd. | Wholesale & retail | 1994 |
| Gabtor Limited | Real estate | 2022 |
| GAD Eiddo CYF | Real estate | 2018 |
| Gadlys Farm Limited | Agriculture & fishing | 2023 |
| GAH (Wales) Properties Ltd | Real estate | 2022 |
| Garreg Fawr Limited | Households | 2020 |
| Gazelle Hotel Ltd | Hospitality | 2025 |
| GER Y Bont Limited | Hospitality | 2022 |
| Ghwp Properties Ltd | Real estate | 2025 |
| Glan Y Fenai Management Company Limited | Households | 2005 |
| Greenward Heating Ltd | Construction | 2023 |
| Griffilms Animation Studio Ltd | Information & communication | 2014 |
| GT Property Group Ltd | Real estate | 2022 |
| Gwyndaf Pritchard Roofing Limited | Construction | 2007 |