Fannie Mae's and Freddie Mac's stock prices have lagged behind the S&P 500 and the growth rate of their mortgage portfolios this year, but analysts say the shares could rebound.

Indeed, with concerns over Asian economies driving investors to companies with little foreign exposure, the stocks have had an upswing in recent days. Fannie Mae was trading at $62.1875 at midday on Tuesday, up from $58.875 last Thursday. Freddie Mac was at $47, up from $44.188 last Thursday.

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