Doubleline Strategic Opportunity Fund. Replay the stock market charts of OPP day by day, back to 2003. Open long and short positions without spending any money. RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. is a closed ended fixed income mutual fund launched and managed by RiverNorth Capital Management, LLC. The fund is co-managed by DoubleLine Capital LP. It invests in fixed income markets. The fund seeks to benchmark the performance of its portfolio against the Barclays Capital U.S. Aggregate Bond Index. RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. was formed on December 30, 2010 and is domiciled in the United States.