PIMCO Total Return Fund is the world's biggest bond fund. The company is run by Bill Gross and in June sustained its weakest monthly performance since September 2008. This was amid the selloff in the US Treasuries and other bonds as shows in the data from Morningstar last Monday.

The fund has around US$285.2 billion in assets. It went down by 2.64% last month which marked its weakest monthly performance since the collapse of Lehman Brothers in the fall of 2008. PIMCO was just ahead of other US intermediate term bond mutual funds that month by 17%.

The fund research firm Morningstar said that the PIMCO Total Return ETF marked its weakest monthly performance since inception in February 2012 by 2.21%.  

In another data, the Morningstar showed that The DoubleLine Total Return Bond Fund was also down by 1.74% last month. The company is the flagship fund of DoubleLine Capital LP. The decrease in performance was its weakest since its inception in April of 2010.