Doubleline's Jeff Gundlach enters the ETF business By: CNBC.com News February 25, 2015 at 15:42 PM EST Doubleline's Jeff Gundlach has entered the ETF business. His DoubleLine Total Return Tactical ETF had a respectable debut Tuesday. Read More >> Related Stocks: Interm Term Bond ETF Vanguard Pimco Active Bond TR ETF SPDR Doubleline Total Return Tactical ETF