Corrections Corporations of America was up 43% to $20.42 per share as of 9:49 a.m. ET.
GEO Group, another prison provider, was up 25% to $26.69 at the same time.
President Barack Obama and the Department of Justice announced in August that the federal government would stop using private facilities. Hillary Clinton, Trump's Democratic opponent, supported those measures as well.
These announcements sent the companies' stocks spiraling at the time.
Google Finance