BALTIMORE — The Baltimore Orioles agreed to a $155 million, five-year contract with slugger Pete Alonso, according to multiple reports Wednesday.

The deal was pending a physical.

It’s a major move for a Baltimore team that vowed to be aggressive after a last-place finish in the AL East. Alonso hit .272 with 38 home runs and 126 RBIs for the New York Mets this year, posting an .871 OPS that was his highest since he hit 53 home runs as a rookie in 2019.

Alonso, a first baseman who turned 31 on Sunday, hit a franchise-record 264 homers over seven seasons with the Mets. He has earned All-Star honors five times, including each of the past four years.

Nicknamed the Polar Bear, Alonso became a Citi Field fan favorite as a homegrown member of the Mets. He was the NL Rookie of the Year in 2019, when he hit .260 with a major league-high 53 homers — a rookie record — and 120 RBIs. He had a career-high 131 RBIs in 2022.

Alonso batted a career-low .217 in 2023 while hitting 46 homers and driving in 118 runs, and he hit .240 with 34 homers and 88 RBIs in 2024.

After a slow free agent market last winter, Alonso signed a $54 million, two-year contract to stay with the Mets, but he opted out of the final year of the deal, forfeiting $24 million.

Alonso turned down a $158 million, seven-year offer from the Mets in 2023 that would have covered 2024-30. He will wind up earning $205.5 million over those seven seasons, a 30% increase.

Alonso met with teams at the winter meetings in Orlando, Fla.

“Pete lives in Tampa. It’s rather warm there,” his agent, Scott Boras, said Tuesday. “So the polar vortex of last year has kind of thawed. So the prior market, that prior bear market is exhausted.”

The Orioles won the AL East in 2023 and were a wild card last year, but a team full of young talent backslid significantly in 2025. Baltimore’s pitching had a lot to do with that, but the offense wasn’t great either despite the presence of Gunnar Henderson, Adley Rutschman and Jordan Westburg.

Alonso gives the Orioles a veteran power bat in the middle of the lineup, and new manager Craig Albernaz will have some flexibility. Rutschman and Samuel Basallo are options at catcher and designated hitter, with Basallo potentially getting at-bats at first base, too. Alonso has played 162 games each of the past two seasons, almost entirely at first base.

“Christmas came early,” Maryland Gov. Wes Moore said on social media after the news broke.

Earlier this offseason, Baltimore signed reliever Ryan Helsley and traded for outfielder Taylor Ward.

The Mets lost Alonso a day after All-Star closer Edwin Díaz agreed to leave New York for a $69 million, three-year contract with the two-time defending World Series champion Los Angeles Dodgers, a deal still not finalized. New York also traded outfielder Brandon Nimmo to Texas on Nov. 24 for Gold Glove second baseman Marcus Semien.

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