BOIL ETF: What Is Going on With the ProShares Ultra Bloomberg Natural Gas Fund? ProShares Ultra Bloomberg Natural Gas Fund (NYSEARCA: BOIL ) has had a turbulent week. The exchange-traded fund (ETF) saw prices plunge yesterday as natural gas futures fell 17%, hitting a three-month low. Today the BOIL ETF is climbing again, but news out of Russia is threatening to complicate matters further. Russian President Vladimir Putin has seized control of Sakhalin Energy Investment Co. , a move that will likely affect Western oil producers. What’s Happening With the BOIL ETF? Even as markets shift in its favor, the BOIL ETF is experiencing volatility. It began this morning by falling 5% only to immediately rebound. As of this writing, it is up more than 8%. After slowly trending upward for most of this week, shares fell 34% yesterday. This marked the lowest point in months for liquefied natural gas (LNG). Prices are back to rising today, but investors still have plenty of cause for concern about the industry. Let’s take a closer look at the factors affecting the LNG field and the BOIL ETF.