$INSW (+150% YTD) vs $TNK (+90% YTD): Weighing Two Leading Tanker Stocks Both INSW and TNK are leading tanker shipping companies focused on crude oil and petroleum product transportation, benefiting from elevated freight rates in recent market activity. INSW holds a larger market capitalization of approximately $5.3 billion compared to TNK's roughly $3.5 billion, with stronger year-to-date gains exceeding 150 percent versus about 90 percent for TNK. $INSW $TK $FRO $DHT $STNG