Gwnaeth y cwmni gaffael tir ym Mharc Tŷ Gwyn gan Lywodraeth Cymru i adeiladu'r safle newydd 13,700 o droedfeddi sgwâr ac mae'r buddsoddiad diweddar gan GMJ wedi arwain at gwmnïau eraill yn buddsoddi ar y safle.
The company acquired land on Parc Ty Gwyn from the Welsh Government to build their new 13,700 sq ft premises and the recent investment by GMJ has resulted in other companies investing on site.