After plunging to their lowest levels since the early 1990s on Monday, shares of both Fannie Mae and Freddie Mac, the two largest providers of U.S. mortgage financing, rose this morning after their regulator said they should have adequate returns to raise capital.

Freddie shares were at $12.92 in pre-open trade, up from Monday's close of $11.91, and Fannie shares rose to $16.80, up from Monday's close of $15.74.