The BP Prudhoe Bay Royalty Trust is a United States oil and natural gas royalty trust based in New York, New York. With a market capitalization of US$155 million in early 2020, and an average trading volume of 322,000 shares, BP Prudhoe Bay Royalty Trust is the largest conventional oil and gas trust in the United States. Its assets are in the huge Prudhoe Bay Oil Field, the largest oil field in North America, and at the end of 2006 the Trust claimed to have proved reserves of 85.1 million barrels of crude oil. As of the end of 2018 the Trust claimed to have proved reserves of 15.77 million barrels of crude oil.