Also as part of that trade, Matthew signed an eight-year contract that runs through the 2029-30 season.
The Panthers advanced to the Stanley Cup Final in each of his first three seasons with them, including winning back-to-back championships in 2024 and 2025. Florida (40-38-4) finished seventh in the Atlantic Division this season and missed the playoffs.
Selected by the Flames with the No. 6 pick in the 2016 NHL Draft, Matthew has 670 points (253 goals, 417 assists) in 673 regular-season games with Calgary and Florida, and 84 points (32 goals, 52 assists) in 94 playoff games. Since being traded to the Panthers, the 28-year-old has 288 points (101 goals, 187 assists) in 242 regular-season games, and 69 points (25 goals, 44 assists) in 67 playoff games.
Although next season will be the first time the Tkachuk brothers play together in the NHL, it won't be the first time they've been on the same team.
Brady and Matthew played for Team USA at the 4 Nations Face-Off in February 2025, as well as the 2026 Winter Olympics this past February, when they helped the Americans win the gold medal for the first time since 1980. Brady had five points (three goals, two assists) in six Olympic games; Matthew had six assists in the six games.
"I think you can always dream about it; I don't even think we thought it could be a reality until the Olympics," Brady said. "I think our only dream as a kid was just to make it to the NHL. ... Seeing each other every day for three weeks was the best part, being together and our families being together.
"That was something that was really important, to have our kids grow up together and be close. It's something that's going to be really special for our family."
NHL.com senior writer Tom Gulitti contributed to this report