BlackRock Preferred Opportunity Trust is an equity exchange traded fund launched by BlackRock, Inc. The fund is co-managed by BlackRock Advisors, LLC and BlackRock Financial Management, Inc. It invests in the public equity markets of the United States. The fund invests in stocks of companies operating across diversified sectors. It invests in preferred stocks of companies. BlackRock Preferred Opportunity Trust was formed on February 25, 2003 and is domiciled in the United States.