Star Bulk Carriers' shares have taken a tumble after the Petros Pappas-led company on Tuesday revealed a stock incentive plan for company executives.

The Nasdaq-listed owner said up to 4 million shares will be on offer depending on performance.

Following the morning announcement, the company's shares have fallen 12.4% to $9.15, taking $5.1m off a deal that hours before was worth $41.7m.