Shares of Fannie Mae and Freddie Mac shot higher on Wednesday after President Donald Trump said they would retain their government guarantees even after going “public”—though they gave back some of those gains after the head of the companies’ conservator said they may not exit government control after all.

Over-the-counter (OTC) shares of Fannie Mae and Freddie Mac rose on Wednesday after U.S. President Donald Trump said he was working on taking the housing giants public.

President Trump says he'll decide soon whether to take Fannie Mae and Freddie Mac public — a move that was vocally sought by Trump ally Bill Ackman.