West African pirates boarded a tanker managed by Evangelos Marinakis-controlled Capital Ship Management on Sunday night, kidnapping four crew members.
Security consultancy Dryad Global said the 38,000-dwt Agisilaos (built 2006) was attacked by an unknown number of gunmen while underway in Ghanaian waters, 75 nautical miles (139 km) south of Lome in Togo.
The vessel is understood to have a crew of 22 personnel, including Russian, Romanian and Filipino nationals.
