Pimco [see profile] co-founder and co-CIO Bill Gross confessed to the Wall Street Journal that he has lost sleep over his investing missteps.

Gross in February got rid of all of Pimco Total Return's Treasury holdings and in March he made use of derivatives to bet against government-related bonds. Those moves were a "mistake," Gross told the WSJ.

Since Gross made those moves, the U.S. Treasury market has rallied. 

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