Fannie Mae and Freddie Mac both continued to grow their mortgage portfolios at a brisk pace during August, with each government-sponsored enterprise purchasing $22 billion in mortgage securities and loans during the month. The purchases boosted Fannie Mae’s portfolio to $684.02 billion from $675.15 billion a month earlier. Freddie Mac’s retained portfolio swelled from $454.49 billion to $465.55 billion during the same period.