Shares in the US-listed OSV owner and operator lost $2.48 to end the trading day at $13.88 per share.
GulfMark shares have lost almost 70% over the past twelve months due to the fall in the oil price and the resulting decline in E&P spending.
On Monday GulfMark reported a first-quarter loss of $5.1m, after reporting a profit in the corresponding period a year earlier.
The
