2. Guggenheim Shipping ETF ( SEA) began trading on Jun. 11, 2010. The fund seeks investment results that correspond generally to the performance of an equity index called the Delta Global Shipping Index. Companies of this maritime shipping industry index that derive revenue from the 'SEA'-borne transport of dry bulk goods, leasing or operating tanker ships, container ships, specialty chemical ships and ships that transport liquid natural gas include Teekay Tankers ( TNK), Knightsbridge Tankers ( VLCCF), and Seaspan ( SSW).