ClearBridge Energy MLP Opportunity Fund has raised $540 million in an initial public offering (IPO). The portfolio can reach $621 million, if its shareholders plan to exercise their option of overallotment.

Morgan Stanley, Citigroup Global Markets and BofA Merrill Lynch were the underwriters on the sale. The fund began trading of the shares on the New York Stock Exchange from June 10, 2011.

Click here for the release from Business Wire.