ClearBridge Energy MLP Opportunity Fund Inc. (the Fund) is a non-diversified, closed-end management investment company. The Fund's investment objective is to provide long-term investors a high level of total return with a focus on cash distributions. The Fund focuses on achieving its objective by investing primarily in master limited partnerships (MLPs) in the energy sector. The Fund considers an entity to be within the energy sector if it derives over 50% of its revenues from the business of exploring, developing, producing, gathering, transporting, processing, storing, refining, distributing, mining or marketing of natural gas, natural gas liquids, crude oil, refined petroleum products or coal. The Fund's portfolio includes its investments in MLPs in various areas, such as diversified energy infrastructure, liquids transportation and storage, and shipping. Legg Mason Partners Fund Advisor, LLC is the Fund's investment manager and ClearBridge Investments, LLC is its sub advisor.