(Bloomberg Business) -- The last of the rock star portfolio managers is about to see how big his name really is.

The SPDR DoubleLine Total Return Tactical ETF launches today. It will be managed by Jeffrey Gundlach, who also runs the DoubleLine Total Return Bond Fund, a top-performing mutual fund. The new fund is the 26th ETF to be launched this year, but it is possibly the most important as a test of whether active management can ever thrive inside the ETF industry.

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