Originally selected by the Blues in the third round (93rd overall) of the 2019 NHL Draft, Ellis is coming off his best season as a pro in 2023-24.
In 21 games with the ECHL's Orlando Solar Bears, Ellis posted a .923 save percentage, 2.45 goals-against average, and a 12-5-1 record. After his recall to the T-Birds, he went 7-9-0 with a .924 save percentage and 2.89 goals-against average in 16 games.
Ellis found himself near the top of a number of AHL goaltending categories in the 2024-25 season. In 42 games, he posted a 22-14-3 record, an AHL-high 1253 saves, three shutouts, and a 2.63 goals-against average (19th in AHL). His .922 save percentage was 4th in the AHL. Though he could not get Springfield past Providence in the Calder Cup Playoffs, Ellis was stellar in the postseason with a 2.32 goals-against average and .933 save percentage in the three-game First Round series.
For his efforts, Ellis was rewarded with a two-year, two-way contract extension by the St. Louis Blues, which will run through the end of the 2026-27 season.
Entering the 2025-26 season, Ellis has posted a record of 30-26-5 in his AHL career.