Adams Natural Resources Fund, Inc. is a publicly owned investment manager. The firm invests in the public equity markets across the globe. It invests in stocks of companies of all market capitalizations operating in the energy and natural resources sector including oil companies, exploration and production, utilities, services, and basic materials sectors. The firm employs a fundamental analysis with a bottom-up stock picking approach while focusing on earnings growth prospects, defendable market position, market competition, macroeconomic backdrop, cash flow generation, valuation, capital allocation, return on capital, mileposts and catalysts, and "point in cycle" identification to make its investments. It benchmarks the performance of its portfolios against a composite index of 80% Dow Jones Oil and Gas Index and 20% Dow Jones Basic Materials Index. The firm was formerly known as Petroleum & Resources Corporation. Adams Natural Resources Fund, Inc. was founded in January 1929 and is based in Baltimore, Maryland with an additional office in Boston, Massachusetts.