The Red Sox designated Criswell for assignment Thursday, Chris Cotillo of MassLive.com reports.

The Red Sox re-signed Criswell to a one-year contract in early November, but he'll lose his roster spot less than one month later. He spent the majority of the 2025 season with Triple-A Worcester and should have the chance to contribute as a reliever at some point in 2026 if he sticks with the organization.

Samaniego was traded along with Johan Oviedo and Adonys Guzman from the Pirates to the Red Sox in exchange for Jhostynxon Garcia and Jesus Travieso on Thursday, Jeff Passan of ESPN.com reports.

The Pirates added Samaniego to the 40-man roster in mid-November, but he'll now try to reach the majors with the Red Sox. He'll be entering his age-27 season and has yet to pitch above Double-A, though he did post a strong 3.08 ERA and 0.92 WHIP across 26.1 innings with Altoona while working exclusively as a reliever. Samaniego is a strong candidate to begin the 2026 season with Triple-A Worcester, but he could provide depth to the Boston bullpen at some point in 2026.

Oviedo was traded from the Pirates to the Red Sox in exchange for Jhostynxon Garcia and Jesus Travieso on Thursday, Jeff Passan of ESPN.com reports. Tyler Samaniego and Adonys Guzman are also going to Boston in the deal.

After acquiring Sonny Gray earlier in the offseason, the Red Sox remained aggressive in upgrading their rotation this winter. Oviedo rehabbed from Tommy John surgery for much of the 2025 season, though he managed to join the Pirates' rotation for the final two months of the campaign. In nine starts, the right-hander managed a 3.57 ERA,1.21 WHIP and 42:23 K:BB across 40.1 frames. Control has been a consistent concern for Oviedo throughout his 361 innings in the big leagues, but he should be a decent back-end starter for the Red Sox.

The Angels signed Ynoa to a minor-league contract Thursday, Taylor Blake Ward of The Sporting Tribune reports.

Ynoa spent much of the 2025 season pitching in the Mexican League following a brief stint in the Twins organization at Triple-A St. Paul, where he allowing eight runs (five earned) over 4.1 innings. The 27-year-old hasn't pitched in the big league since 2022 and has struggled with elbow and shoulder woes since then.

The Twins signed Hartwig to a minor-league contract with an invitation to spring training Thursday, Darren Wolfson of Channel 5 Saint Paul reports.

Hartwig split the 2025 season between Triple-A Syracuse in the Mets organization and with the Hanshin Tigers of Nippon Professional Baseball in Japan. Slated to turn 28 later this month, Hartwig has collected a 5.14 ERA and 34:19 K:BB over 42 innings during his time at the big-league level.

Mullins signed a one-year, $7 million contract with the Rays on Wednesday, Marc Topkin of the Tampa Bay Times reports.

2025 marked one of Mullins' worst seasons at the plate in the majors, as he finished the year with a .216/.299/.391 batting line over 498 plate appearances alongside 17 homers, 59 RBI, 58 runs scored and 22 steals. With fellow lefty-hitting outfielders Chandler Simpson, Jake Fraley and Josh Lowe already in Tampa Bay, so Mullins may need to improve upon his 2025 numbers to maintain a regular spot in the lineup.

The Guardians signed Brogdon to a one-year, $900,000 contract Wednesday, Zack Meisel of The Athletic reports.

Brogdon made 43 appearances for the Angels in 2025, putting up a 5.55 ERA and 49:18 K:BB over 47 innings. Slated to turn 31 next month, Brogdon hasn't had much success at the big-league level since 2022, but the Guardians felt the right-handed reliever was worthy of a major-league deal. Brogdon will have an additional year of arbitration eligibility in 2027.

The Astros signed Perez to a minor-league contract Nov. 28.

Perez spent all of the 2025 campaign at Triple-A Iowa in the Cubs organization, putting up a .944 OPS with 27 long balls. The 35-year-old last saw action at the big-league level in 2023 and will provide the Astros with experienced catching depth at Triple-A Sugar Land.

Arroyo will begin transitioning from second base to left field this month during the Columbian Winter League, Adam Jude of the Seattle Times reports.

Arroyo played second base exclusively in 2025 between High-A Everett and Double-A Arkansas, slashing .262/.401/.433 with 17 homers and 12 steals between the two stops. He has never played the outfield before, but with the Mariners' infield depth, the organization has elected to move the 21-year-old to left field. Arroyo could push to debut at some point during the 2026 season.

Young is the leading candidate to start at second base for the Mariners next season, Adam Jude of the Seattle Times reports.

Young's playing time tapered off for the Mariners down the stretch of the regular season and he did not play during the playoffs. However, Seattle remains high on the 22-year-old's potential despite a .211/.302/.305 batting line in 77 games this season. The Mariners could acquire a second baseman from outside the organization, but if they don't, the left-handed-hitting Young is the top candidate to start at least against righties. Leo Rivas and Ryan Bliss (knee) will also be in the mix.