The move has been expected since Bartiromo's departure from CNBC, CNN Money reported.
Fox said Bartiromo will have a program on weekdays during the period when the markets are open and a Sunday morning slot. The weekday program will be similar to "Closing Bell," which she anchored from 3 p.m. to 5 p.m. on CNBC.
"I tapped Maria to report live from the floor of the New York Stock Exchange while at CNBC, and I am delighted to have her join me once again alongside our star lineup at Fox Business," Ailes said in a statement.
CNBC has far higher ratings than Fox Business, which was launched six years ago, while Fox News has outpaced CNN and MSNBC.