| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 3 | 2 | 6 | 13 | 55.0 | 56 | 12 | 48 | 26 | 4.29 | 1.234 | 13.8 |
| 2025 | 4 | 4 | 11 | 21 | 76.3 | 81 | 16 | 71 | 38 | 4.48 | 1.271 | 23.1 |
| 2024 | 1 | 0 | 1 | 6 | 32.0 | 27 | 6 | 25 | 12 | 3.38 | 1.031 | 11.9 |
| 2023 | 3 | 0 | 0 | 5 | 34.0 | 37 | 13 | 25 | 19 | 5.03 | 1.471 | 1.3 |
| Date | News |
| 2/12/26 | Jose Ferrer, Mariners’ new bullpen weapon, makes strong impression at spring training. On paper, Jose Ferrer looked like an ideal fit for the Mariners bullpen. In person, he was exactly that in his first formal workout with his new club Thursday. Source: https://www.seattletimes.com/sports/mariners/jose-... |
| 12/07/25 | Mariners land LHP Ferrer from Nats for prospects. The Mariners acquired lefty reliever Jose Ferrer from the Nationals for top catching prospect Harry Ford and minor league pitcher Isaac Lyon. Source: https://www.espn.com/mlb/story/_/id/47226495/marin... |
| 12/07/25 | Mariners land LHP Ferrer from Nats for prospects. The Mariners acquired lefty reliever Jose Ferrer from the Nationals for top catching prospect Harry Ford and minor league pitcher Isaac Lyon. Source: https://www.espn.com/mlb/story/_/id/47226495/marin... |
| 12/06/25 | Mariners land LHP Ferrer from Nats for prospects. The Mariners acquired lefty reliever Jose Ferrer from the Nationals for top catching prospect Harry Ford and minor league pitcher Isaac Lyon. Source: https://www.espn.com/mlb/story/_/id/47226495/marin... |
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