While billionaire property developer Lang Walker presses ahead with projects in Adelaide and Parramatta, and as the market waits to see what his next move is with the $2.5 billion Collins Square project in Melbourne, he is also dabbling in several listed biotech stocks.

A perennial BRW Rich List member, Mr Walker is also a big shareholder in a string of small and micro-cap companies – more than a decade after a move to float his company on the Australian Securities Exchange, which later had a name change, then privatisation, and is now known as Walker Corporation.