The ClearBridge Energy MLP Opportunity Fund Inc. is a U.S.-domiciled, closed-end equity mutual fund, established on April 5, 2011. It operates under the primary management of Legg Mason Partners Fund Advisor, LLC, with ClearBridge Investments, LLC serving as co-manager. The fund directs its investments towards the public equity markets of the United States, concentrating on the energy sector. Its core strategy involves acquiring equity securities of Master Limited Partnerships (MLPs) that operate within the infrastructure of crude oil, natural gas liquids, and refined products. To build its portfolio, the fund prioritizes companies exhibiting long-lasting assets, consistent cash flow generation, and limited direct exposure to commodity price volatility.