China dominates in oil tanker market.

China's demand for crude oil shows no signs of abating. There are currently more supertankers bound for the Asian nation than at any time since the start of 2017 and possibly longer. That could signal that China's refineries are planning to run hard through the end of the year when the shipping industry is moving to cleaner fuel standards.

China could also be working to secure supply following recent tensions in the Middle East. Most of the 109 supertankers observed heading for China in a recent Bloomberg tanker-tracking...