Mailloux signed a one-year, $850,000 contract extension with the Blues on Tuesday.
Mailloux has produced just two points over 31 appearances with the Blues this season, but the defenseman has done enough to keep the team's interest. He'll likely finish out 2025-26 in a third-pairing role, and he'll have to compete for his spot in 2026-27, though his contract is a one-way deal.