Oil funds that use leverage to juice returns have been among the top-performing exchange-traded funds of 2019, gaining almost 90%. Yet investors have pulled $325 million from the two biggest exchange-traded products that seek to double or triple the daily return of U.S. crude futures contracts, a sign there is more than meets the eye in this obscure and risky market.

Source: Wall Street Journal March 13, 2019 12:00 UTC