Netscher acquired 20,000 St Barbara shares on-market today, nearly doubling his holding to 43,414 shares.
He paid A$2.955 per share for a total of $59,100.
St Barbara shares dropped 12.3% on Friday as the company resumed trading following the first stage of a $495 million raising to fund the acquisition of Canada's Atlantic Gold.
The stock was down 0.3% today to $2.90, just above the raising price of $2.89.
Netscher is also chairman of Gold Road Resources, where he holds 765,000 shares.