| Vale of Rheidol Trading Limited | Manufacturing | 2014 |
| Vallis Management Limited | Households | 2013 |
| Valuelook Limited | Hospitality | 1987 |
| Vamos Polo Ltd | Arts & recreation | 2019 |
| Venice Barberz Ltd | Other services | 2024 |
| Venice Nice Barber Ltd | Other services | 2021 |
| Vertikit Ltd | Wholesale & retail | 2021 |
| Verzyme (UK) Limited | Professional & scientific | 2006 |
| VIA Urbana Ltd | Hospitality | 2026 |
| Vibrat-Ion Ltd | Manufacturing | 2021 |
| Volkstrek Ltd | Wholesale & retail | 2018 |
| W & H Thomas Limited | Hospitality | 2003 |
| W C T Pugh Limited | Agriculture & fishing | 2026 |
| Wardens Theatre Company Ltd | Arts & recreation | 2014 |
| Washtell-Blaise Limited | Administrative & support | 2016 |
| Watchobsession Ltd | Wholesale & retail | 2014 |
| Waypoint Software Limited | Wholesale & retail | 2019 |
| Weir Electrical Ltd | Manufacturing | 2015 |
| Weird Beard IT Limited | Information & communication | 2025 |
| Welsh Fisherman's Association-Cymdeithas Pysgotwyr Cymru Limited | Agriculture & fishing | 2011 |
| West Wales Campervan Hire Ltd | Administrative & support | 2021 |
| West Wales Domestic Abuse Service Ltd | Health & social care | 2009 |
| Westerly Ltd | Real estate | 2011 |
| Western Welsh Financial Services (Ceredigion) Limited | Financial services | 2011 |
| Where's My Pony Ltd | Arts & recreation | 2025 |
| William Jones 1917 Ltd | Households | 2023 |
| Winsor Healthcare Ltd | Wholesale & retail | 2011 |
| Wisewoods Wales | Manufacturing | 2012 |
| Wishful Thinking Fundamentals Limited | Information & communication | 2017 |
| Wishing Wellbeing Ltd | Wholesale & retail | 2018 |
| WL Trading Company (Wales) Ltd | Manufacturing | 2012 |
| Woodland FUN Ltd | Agriculture & fishing | 2020 |
| Woodlands Caravan Park Limited | Hospitality | 1986 |
| Wordmasonry Limited | Information & communication | 2016 |
| WOW Wales One World Film Festival Ltd | Information & communication | 2001 |
| WR Aberystwyth Ltd | Construction | 2025 |
| Wwec Ltd | Construction | 2019 |
| Xiancai Limited | Wholesale & retail | 2026 |
| Y Clwb 1965 Ltd | Hospitality | 2025 |
| Y Crwban Limited | Hospitality | 2025 |
| Y Dafarn Datws (2017) CYF | Hospitality | 2017 |
| Y Lanfa Residential Management Limited | Households | 1995 |
| Y Lolfa Cyfyngedig. | Manufacturing | 1979 |
| Y Selar Limited | Information & communication | 2009 |
| Yardcard Limited | Wholesale & retail | 2022 |
| Yellowmoth Jewellery Ltd | Manufacturing | 2025 |
| Ymgynghorwyr Seilo CYF | Construction | 2014 |
| Ynyslas Visitor Centre Legal Campaign Ltd | Other services | 2025 |
| Your Creative Nature CIC | Health & social care | 2024 |
| YR HEN Aelwyd CYF | Real estate | 2005 |
| Ystrad Nursery and Agricultural Supplies Ltd | Wholesale & retail | 2016 |
| Ystumtec Ltd. | Manufacturing | 2011 |
| Ystwyth Cleaning Services Ltd | Administrative & support | 2022 |
| Ystwyth Garage Limited | Wholesale & retail | 2026 |
| Ystwyth Holdings Ltd | Agriculture & fishing | 2025 |
| Ystwyth Homes Limited | Construction | 1986 |
| Ystwyth Investment Properties Limited | Real estate | 1998 |
| Zamas Medical Ltd | Health & social care | 2025 |
| Zentron UK Ltd | Manufacturing | 2026 |
| Zone SIX Studios Ltd | Education | 2024 |
| Zyra Enterprises Ltd | Information & communication | 2013 |