| Date | Player | Last Season Stats | Experience | Age | Old Team | New Team | Notes |
|---|---|---|---|---|---|---|---|
| 01-11-2024 | Angel Macuare (P) | Minor League | 0 | 24 | HOU | MIA | Minor League contract |
| 01-11-2024 | Luke Weaver (P) | 3-6, 62 K, 4.25, in 65.2 IP. | 7 | 30 | NYY | NYY | one-year |
| 01-11-2024 | Andrew Knizner (C) | .174, 1 HR, 9 RBI in 161 AB. | 4 | 29 | STL | TEX | one-year |
| 01-11-2024 | Naoyuki Uwasawa (P) | - | 0 | 30 | TB | Minor League contract | |
| 01-11-2024 | Marcus Stroman (P) | 10-13, 158 K, 3.02, in 179 IP. | 8 | 32 | CHC | NYY | two-year |
| 01-11-2024 | Michael Chavis (IF) | .248, 3 HR, 11 RBI in 121 AB. | 4 | 28 | WSH | SEA | Minor League contract |
| 01-10-2024 | Jack Lopez (IF) | .154, 0 HR, 0 RBI in 13 AB. | 1 | 31 | LAA | LAA | Minor League contract |
| 01-10-2024 | Jhonathan Diaz (P) | 1-0, 9 K, 4.15, in 13 IP. | 2 | 27 | LAA | SEA | Minor League contract |
| 01-10-2024 | Mauricio Llovera (P) | 1-0, 7 K, 9.45, in 6.2 IP. | 3 | 28 | BOS | SEA | Released |
| 01-10-2024 | Jonathan Holder (P) | Minor League | 5 | 30 | LAA | TEX | Minor League contract |
| 01-10-2024 | Tanner Tully (P) | Minor League | 1 | 29 | NYY | Minor League contract | |
| 01-10-2024 | Errol Robinson (IF) | Minor League | 0 | 29 | STL | BAL | Minor League contract |
| 01-10-2024 | Yacksel Rios (P) | 3-0, 23 K, 4.28, in 27.1 IP. | 5 | 30 | OAK | NYM | Minor League contract |
| 01-10-2024 | Jake Woodford (P) | 3-4, 50 K, 3.99, in 67.2 IP. | 3 | 27 | STL | CHW | Minor League contract |
| 01-10-2024 | Lake Bachar (P) | - | 0 | 28 | SD | SD | Minor League contract |
| 01-10-2024 | Austin Pruitt (P) | 0-1, 5 K, 3.68, in 7.1 IP. | 5 | 34 | OAK | TEX | Minor League contract |
| 01-10-2024 | Shane Greene (P) | 0-1, 1 Sv,24 K, 7.23, in 23.2 IP. | 9 | 35 | CHC | TEX | Minor League contract |
| 01-10-2024 | Elieser Hernandez (P) | 1-3, 53 K, 4.18, in 51.2 IP. | 5 | 28 | NYM | LAD | Minor League contract |
| 01-09-2024 | Cody Thomas (OF) | Minor League | 1 | 29 | OAK | Orix (JPN) | |
| 01-09-2024 | Cory Abbott (P) | 0-0, 12 K, 6.75, in 17.1 IP. | 2 | 28 | WSH | SEA | Minor League contract |
| 01-09-2024 | Shota Imanaga (P) | - | 0 | 30 | CHC | four-year | |
| 01-09-2024 | Kirby Snead (P) | 0-1, 7 K, 2.35, in 7.2 IP. | 2 | 29 | OAK | SEA | Minor League contract |
| 01-08-2024 | Anderson Espinoza (P) | Minor League | 1 | 26 | SD | Orix (JPN) | |
| 01-08-2024 | Kevin Smith (IF) | .094, 1 HR, 1 RBI in 32 AB. | 2 | 27 | OAK | NYY | Minor League contract |
| 01-08-2024 | Rob Brantly (C) | .150, 0 HR, 0 RBI in 20 AB. | 8 | 34 | TOR | TB | Minor League contract |
| 01-08-2024 | Jonathan Davis (OF) | .126, 1 HR, 4 RBI in 87 AB. | 5 | 31 | MIA | MIA | Minor League contract |
| 01-07-2024 | Wil Crowe (P) | 4-8, 111 K, 5.48, in 116.2 IP. | 3 | 29 | Kia (KOR) | ||
| 01-07-2024 | Teoscar Hernandez (OF) | .296, 32 HR, 116 RBI in 550 AB. | 7 | 31 | SEA | LAD | one-year |
| 01-07-2024 | Juan Mateo (IF) | - | 0 | 16 | ATL | Minor League contract | |
| 01-07-2024 | Sean Manaea (P) | 11-10, 194 K, 3.91, in 179.1 IP. | 7 | 32 | SF | NYM | two-year |
| 01-06-2024 | Franmil Reyes (OF) | .254, 30 HR, 85 RBI in 418 AB. | 5 | 28 | Hokkaido (JPN) | ||
| 01-05-2024 | Jose Caballero (IF) | Minor League | 0 | 27 | SEA | TB |
Traded
The Seattle Mariners acquired outfielder/first baseman Luke Raley from the Tampa Bay Rays for infielder Jose Caballero.
|
| 01-05-2024 | Luke Raley (OF/1B) | .182, 2 HR, 4 RBI in 66 AB. | 2 | 29 | TB | SEA |
Traded
The Seattle Mariners acquired outfielder/first baseman Luke Raley from the Tampa Bay Rays for infielder Jose Caballero.
|
| 01-05-2024 | Mitch Haniger (OF/DH) | .253, 39 HR, 100 RBI in 620 AB. | 6 | 33 | SF | SEA |
Traded
The San Francisco Giants acquired pitcher Robbie Ray from the Seattle Mariners for outfielder Mitch Haniger, pitcher Anthony DeSclafani and cash.
|
| 01-05-2024 | Luis Guillorme (IF) | .265, 1 HR, 5 RBI in 132 AB. | 5 | 29 | NYM | ATL | one-year |
| 01-05-2024 | Robbie Ray (P) | 13-7, 248 K, 2.84, in 193.1 IP. | 9 | 32 | SEA | SF |
Traded
The San Francisco Giants acquired pitcher Robbie Ray from the Seattle Mariners for outfielder Mitch Haniger, pitcher Anthony DeSclafani and cash.
|
| 01-05-2024 | Dakota Hudson (P) | 1-0, 6 K, 2.08, in 8.2 IP. | 5 | 29 | STL | COL | one-year |
| 01-05-2024 | Jacob Stallings (C) | .246, 8 HR, 53 RBI in 374 AB. | 7 | 34 | MIA | COL | one-year |
| 01-05-2024 | Andrew Kittredge (P) | 9-3, 8 Sv,77 K, 1.88, in 71.2 IP. | 6 | 34 | TB | STL |
Traded
The St. Louis Cardinals acquired pitcher Andrew Kittredge from the Tampa Bay Rays for outfielder/infielder Richie Palacios.
|
| 01-05-2024 | Michael Brantley (OF/DH) | .311, 8 HR, 47 RBI in 469 AB. | 14 | 36 | Retired | ||
| 01-05-2024 | Richie Palacios (OF/IF) | Minor League | 1 | 26 | STL | TB |
Traded
The St. Louis Cardinals acquired pitcher Andrew Kittredge from the Tampa Bay Rays for outfielder/infielder Richie Palacios.
|
| 01-05-2024 | Nick Ward (IF) | - | 0 | 28 | PHI | ATL | Minor League contract |
| 01-04-2024 | Burch Smith (P) | 1-1, 28 K, 5.40, in 43.1 IP. | 5 | 34 | TB | Minor League contract | |
| 01-04-2024 | Brett Phillips (OF) | .202, 13 HR, 44 RBI in 253 AB. | 6 | 29 | LAA | CHW | Minor League contract |
| 01-04-2024 | Cody Poteet (P) | 2-3, 32 K, 4.99, in 30.2 IP. | 2 | 29 | KC | NYY | one-year |
| 01-04-2024 | Kevin Plawecki (C) | .287, 3 HR, 15 RBI in 157 AB. | 8 | 33 | TEX | SD | Minor League contract |
| 01-04-2024 | Daniel Camarena (P) | 0-1, 7 K, 9.64, in 9.1 IP. | 1 | 31 | SD | SD | Minor League contract |
| 01-04-2024 | Andrew Vasquez (P) | 0-0, 3 K, 0.00, in 1.2 IP. | 4 | 30 | DET | DET | Minor League contract |
| 01-04-2024 | David Garcia (C) | Minor League | 0 | 24 | TEX | MIL | Minor League contract |
| 01-04-2024 | Oscar Mercado (OF) | .224, 6 HR, 19 RBI in 214 AB. | 4 | 29 | LAD | SD | Minor League contract |