Prosecutors say Michael Bivans, 23, is one of two men who burst into a home on Heaton Hill Lane in Huntingdon Valley on May 19, 2012.
They say Bivans and another man held the occupants of the home, including women and children, at gunpoint as they robbed the place.
Prosecutors say Bivans has been linked to the crime through surveillance video and forensic evidence.
A $2,500 reward for information leading to Bivans' arrest is being offered through the Citizens Crime Commission of the Delaware Valley, the Lower Moreland Police Department and the Montgomery County District Attorney's Office.
Tips can be left anonymously by calling 215-546-TIPS (8477).