Prosiris Capital Management’s main hedge fund has seen assets plunge by more than 70 percent this year as losses mounted at the credit firm run by Goldman Sachs Group Inc. alumnus Reza Ali. The Prosiris Global Opportunities Fund oversaw $284 million as of Sept. 30, according to a performance summary seen by Bloomberg, compared with $999 million as of December 2015. Investors yanked cash as the New York-based fund lagged behind its benchmark,...