ClearBridge Energy MLP Opportunity Fund Inc. is a US-based closed-ended equity mutual fund managed by Legg Mason Partners Fund Advisor, LLC and ClearBridge Investments, LLC. The fund invests in public equity markets, particularly in the energy industry, focusing on MLPs with long-term and predictable cash flows to build its portfolio. It was formed on April 5, 2011, and primarily invests equity securities in MLPs related to crude oil, natural gas liquids, and refined products infrastructure.