Shifting tides: The fall of container shipping stocks, the rise of tankers

Sometimes stocks in all ocean shipping segments move up or down in unison. Now is not one of those times. Shares of container lines and container-ship leasing companies are down double digits. Shares of ocean carrier Zim (NYSE: ZIM) have lost more than half their value year to date. In contrast, tanker stocks are up double and in some cases triple digits. Shares in product carrier owner Scorpio Tankers (NYSE: STNG) hit yet another 52-week high on Tuesday. They're up 257% year to date. For perspective on what's driving the divergence and on who's investing in these stocks, American Shipper…