Generally, it is a very poor idea to own the United States Natural Gas Fund (NYSEARCA:UNG), which holds front month natural gas futures, as an investment. Normally, natural gas prices are in contango, not backwardation, meaning the front month futures contract is lower priced than the next month further out, and so forth. Thus, most of the time the United States Natural Gas Fund has to roll their contracts from month-to-month, and natural gas futures are in contango, then the United States Natural Gas Fund (UNG) is absorbing a loss from the negative roll yield.