| 07/09/2023 |
Drafted by the Baltimore Orioles in the 2nd round of the 2023 MLB June Amateur Draft from Florida State University (Tallahassee, FL). |
| 07/26/2024 |
Tampa Bay Rays traded RHP Zach Eflin to Baltimore Orioles for RHP Jackson Baumeister, OF Matthew Etzel and OF Mac Horvath. |
| 04/02/2025 |
RHP Jackson Baumeister assigned to Montgomery Biscuits. [Auto] |
| 06/03/2025 |
Montgomery Biscuits placed RHP Jackson Baumeister on the 7-day injured list retroactive to June 1, 2025. [Auto] |
| 07/10/2025 |
Montgomery Biscuits transferred RHP Jackson Baumeister from the 7-day injured list to the 60-day injured list. [Auto] |
| 10/10/2025 |
Wins the 2025 International League Round 2 with the Durham Bulls! |
| 01/01/2026 |
OSA scouting updated ratings (potential): Stuff: 50 (60); Movement: 45 (50); Control: 35 (50). |
| 04/17/2026 |
Injured (mild abdominal strain),day-to-day for one week. |
| 04/23/2026 |
Suffered setback in recovery from injury, will miss another one week. |
| 05/30/2026 |
Injured on 05/27/2026, diagnosed with elbow inflammation, will miss 4 days. |
| 12/19/2026 |
Added to the secondary (40-man) roster for the Tampa Bay Rays. |
| 01/01/2027 |
OSA scouting updated ratings (potential): Stuff: 55 (70); Movement: 45 (50); Control: 40 (55). |
| 06/27/2027 |
Injured on 06/25/2027, diagnosed with a mild abdominal strain, will not miss additional time. |
| 11/30/2027 |
Received a 1-year contract through automatic renewal worth a total of $740,000. |
| 01/01/2028 |
OSA scouting updated ratings (potential): Stuff: 60 (75); Movement: 50 (50); Control: 40 (50). |
| 02/16/2028 |
Unsuccessfully completed training to increase his velocity at the Tampa Bay Rays development complex. |
| 08/29/2028 |
Designated for assignment and placed on waivers by the Tampa Bay Rays. |
| 09/01/2028 |
Was claimed off waivers by Toronto while with Tampa Bay. |
| 11/26/2028 |
Received a 1-year contract through automatic renewal worth a total of $740,000. |
| 01/01/2029 |
OSA scouting updated ratings (potential): Stuff: 70 (75); Movement: 50 (50); Control: 40 (50). |
| 02/16/2029 |
Injured (sore elbow),day-to-day for one week. |
| 11/24/2029 |
Received a 1-year contract through automatic renewal worth a total of $740,000. |
| 12/11/2029 |
Was traded by the Toronto Blue Jays to the Seattle Mariners, along with 3B Kennew Blanco, in exchange for RF Lazaro Montes. |
| 01/01/2030 |
OSA scouting updated ratings (potential): Stuff: 70 (70); Movement: 50 (50); Control: 40 (45). |
| 05/14/2030 |
Injured (conjunctivitis),day-to-day for 2 days. |
| 09/12/2030 |
Injured (mild abdominal strain),day-to-day for 1 day. |
| 11/25/2030 |
Became a free agent. |
| 01/01/2031 |
OSA scouting updated ratings (potential): Stuff: 60 (60); Movement: 45 (50); Control: 40 (45). |
| 01/01/2032 |
OSA scouting updated ratings (potential): Stuff: 55 (60); Movement: 45 (45); Control: 40 (45). |
| 01/01/2033 |
OSA scouting updated ratings (potential): Stuff: 55 (55); Movement: 45 (45); Control: 45 (45). |
| 01/01/2034 |
OSA scouting updated ratings (potential): Stuff: 55 (55); Movement: 45 (45); Control: 45 (45). |
| 11/26/2034 |
Signed a minor league contract with majors option with the Las Vegas Athletics organization. |
| 01/01/2035 |
OSA scouting updated ratings (potential): Stuff: 60 (60); Movement: 45 (45); Control: 45 (45). |
| 10/19/2035 |
Signed a 1-year contract extension worth a total of $2,240,000 with the Las Vegas Athletics organization. |
| 01/01/2036 |
OSA scouting updated ratings (potential): Stuff: 55 (55); Movement: 50 (50); Control: 45 (45). |
| 03/18/2036 |
Released by the Las Vegas organization. |