Just when I thought I was out, they pull me back in. Guggenheim Investments is not The Godfather Part III’s Michael Corleone, but the ETF business is all but inescapable for asset managers nowadays. The company was once a major player in US ETFs, but it sold that $37 billion business line to Invesco in 2017. Last week, it filed for the first such products since, including an Ultrashort Bond ETF and five others: Short Duration Income, Investment Grade CLO, Enhanced Equity Income, Core Plus Bond and Securit ...