The listing of analytical science and devices company Trajan Group has made the founders very wealthy with their near 60 per cent stake valued at over $150 million as the share price climbed on its ASX debut.

Its market capitalisation ballooned to $256 million after the first day of trading on Monday. The stock’s open price was $1.86 and went as high as $2.05 before settling the day at $1.98 – a 16.5 per cent gain. The group’s free float stood at 38.87 per cent of its shares.