United States Commodity Funds LLC (USCF) is a US company based in Oakland, CA, specializing in managing exchange-traded commodity funds, which are often referred to as commodity-based exchange-traded funds (ETFs). USCF was one of the earliest issuers of exchange-traded commodity funds in the United States. It is best known for launching in 2006 the first crude oil based exchange traded commodity fund in the United States, United States Oil Fund, LP (ticker: USO), as well as launching in 2007 the first natural gas exchange traded commodity fund, United States Natural Gas Fund, LP (ticker: UNG). USO and UNG are two of the most actively traded ETFs in the United States. As of June 30, 2016, USCF managed eleven different exchange traded commodity funds with total assets of approximately $5 billion.