Vatrano, 22, appeared in 39 games with the Bruins in 2015-16, recording eight goals and three assists for 11 points with 14 penalty minutes.
Vatrano led the American Hockey League (AHL) in goals in 2015-16, averaging one goal per contest with 36 tallies in 36 games. The 5'9", 201-pound forward had three hat tricks and six multi-goal games on the year at the AHL level, earning First-Team All-Star honors. Vatrano also added 19 assists for 55 total points with 22 penalty minutes and a plus-21 rating.
The East Longmeadow, Massachusetts native was originally signed by the Bruins as a free agent out of the University of Massachusetts at Amherst on March 13, 2015.