Raging Capital Management has amassed a 12.9% stake in the Houston-based offshore support vessel giant.

Details of the acquisition emerged from a regulatory filing to the US Securities and Exchange Commission (SEC).

The hedge fund now controls over 3.3m shares in US-listed GulfMark, a stake worth close to $53m at current prices.

Raging Capital, which is led by Chairman William Martin, normally focuses on long-term value investments.

GulfMark’s