The company says it's investing €300 million at its sites in Grange Castle, Newbridge and Ringaskiddy.
The 300 new manufacturing and lab roles will be filled over the next two or three years.
The company already employs around 4,000 people at six locations around Ireland.
Shaping the Future of Newtownmountkennedy: A Town Team’s Vision for Growth and Community
North Wicklow GP Advice As Flu Season Hits Hard Locally
Wicklow Struggles With Rising Youth Anti-Social Behaviour Amid A Lack Of Collaboration And Resources
Planning A Seasonal Dip? Follow These Water Safety Tips
TD Says No 'Realistic' Rail Plan Evident Amid Failure To Address Growing Commuter Crises For Wicklow