DBRS was the most active rating service in the non-agency MBS market during the first six months of 2018, according to a new Inside MBS & ABS analysis. DBRS rated 26 non-agency MBS totaling $14.08 billion during the first half of the year, which represented 43.5 percent of total issuance. Its market share was up 4.0 percentage points from 2017. Fitch Ratings grew its market share in rating non-agency MBS, which rose from 31.0 percent last year to ... [Includes two data charts]