Carolina Hurricanes

Following the American's elimination from the playoffs, Geekie signed an Amateur Tryout Agreement with the Hurricanes American Hockey League (AHL), the Charlotte Checkers, for the remainder of their regular season.^[14] On May 10, 2018, Geekie signed a three-year, entry-level contract with the Carolina Hurricanes.^[15] After attending the Hurricanes' training camp, Geekie was re-assigned to the Checkers for the 2018–19 season.^[16] In his first full professional season, Geekie helped the team win their first Calder Cup during the 2019 Calder Cup playoffs.^[17]

On March 7, 2020, Geekie was called up to the Hurricanes and made his NHL debut the following day against the Pittsburgh Penguins.^[18] In his NHL debut, he recorded two goals and an assist in the 6–2 win.^[19] On March 10, 2020 Geekie scored his third goal on only the third shot of his NHL career.

Seattle Kraken

On July 16, 2021, Geekie signed a one year contract extension to remain with the Hurricanes.^[20] However, a few days later, Geekie was selected from the Hurricanes at the 2021 NHL Expansion Draft by the Seattle Kraken.^[21] In the Kraken's inaugural 2021–22 season, Geekie established himself in a regular top-nine forward role, and responded in setting career highs with 7 goals and 15 assists for 22 points in 73 regular season games.

As a restricted free agent in the off-season, Geekie filed for arbitration before settling to a one-year, $1.4 million contract extension with the Kraken on July 24, 2022.^[22]

Boston Bruins

After the 2022–23 season, and with Geekie's contract expiring, the Kraken attempted to trade Geekie's restricted free-agent rights in part due to salary cap considerations, but when a deal could not be made, the team did not extend a qualifying offer to Geekie, allowing him to be released to unrestricted free agency.^[23][24] On July 1, 2023, the opening day of free agency, he signed a two-year, $4 million contract with the Boston Bruins.^[25] Geekie found a comfortable role on the Bruins as somebody who could be placed anywhere in the lineup.^[26] On February 29, 2024, recorded the first NHL hat trick of his career. On March 23, 2024, Geekie scored his 100th career NHL point, an assists against the Philadelphia Flyers. Geekie assisted on Brad Marchand's 400th career goal on April 4, 2024. In his first year with the Bruins, Geekie had a career year, almost doubling his previous career high with 17 goals. He added a career high 22 assists for a career high 39 points, the same as his jersey number with the team.