Fannie Mae and Freddie Mac are losing ground in the unusually soft mortgage market of 2014, according to a new analysis by Inside The GSEs. The two companies accounted for 66.3 percent of new single-family mortgage-backed securities during the second quarter of this year That was down from 73.8 percent for all of 2013 and represented the lowest combined GSE share of new MBS since the second quarter of 2011.