Somppi, 20, skated in 59 games with the Halifax Mooseheads of the Quebec Major Junior Hockey League this season, recording 28 goals and 83 points to go along with 28 penalty minutes. He led the Mooseheads for assists (55), points and plus/minus (+39). Somppi's 55 assists ranked sixth overall in the league. The Helsinki, Finland native has also appeared in two QMJHL playoff games, posting one assist. During the 2017-18 season, he served as an assistant captain for Halifax.

The 6-foot-2, 188-pound forward has skated in 178 career QMJHL games, all with the Mooseheads over the past three seasons, collecting 58 goals and 170 points to go along with 83 penalty minutes. Somppi represented Finland at the 2017 World Jr. Championships, skating in five games and registering one goal.

Somppi was drafted by the Lightning in the seventh round, 206th overall, at the 2016 NHL Draft.