A supply glut has dragged U.S. crude for May delivery almost $10 a barrel below contracts a year out. This market structure, known as contango, has encouraged traders to shove the most oil in 80 years into storage so they can sell it for more in the future. The problem is, tanks are filling up, according to banks from Bank of America Corp. to Citigroup Inc. and Goldman Sachs Group Inc.
20 Million Barrels of Pure Profit Sitting in U.S. Oil Tanks
