This is the glory of FNMA , there are hedges that can buy the entire company, only a portion of the float is up for sale.
There is essentially 0 risk for any group that can afford the market cap, as long as they are savvy in their selling.
We all saw what happened last week when some heavy positions tried to unload above $5 over a short period of time. Since every massive position now understands they will have to be patient there won't be any stopping FNMA.