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The Mariners acquired Simpson from the Marlins on Monday in exchange for cash considerations.
Simpson reached the big leagues for the first time in 2025 but was unable to work his way into a high-leverage role with Miami after submitting a 7.34 ERA and 1.83 WHIP in 30.2 innings. The southpaw yielded five home runs over 31 appearances and walked 14.6 percent of the batters he faced, but he generated ground balls at a high rate (59.6 percent) and struck out hitters at a decent clip (23.8 percent). Seattle recognized enough potential in Simpson to bring him aboard as an extra left-handed option out of the bullpen and opened up a 40-man roster spot for him by placing Logan Evans (elbow) on the 60-day injured list.
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Marlins' Josh Simpson: Booted from roster
Rotowire
Simpson was designated for assignment Thursday.
Simpson made his big-league debut in 2025, posting a 7.34 ERA and 1.83 WHIP across 30.2 innings with the Marlins. He walked 22 during that time while also serving up 1.5 HR/9. Those numbers make it little surprise that Simpson lost his roster spot, which is a move that created room for John King to officially be added to the roster.
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Marlins' Josh Simpson: Recalled from Triple-A
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The Marlins recalled Simpson from Triple-A Jacksonville on Friday.
Simpson (2-2) has appeared in 23 games out of the Miami bullpen this season and has an ugly 8.87 ERA, 1.79 WHIP and 24:16 K:BB across 22.1 innings of work. He'll likely fill a middle-relief role for the Marlins.
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Marlins' Josh Simpson: Sent back to minors
Rotowire
The Marlins optioned Simpson to Triple-A Jacksonville on Wednesday.
One day after being torched for seven runs while retiring just one batter in an 11-2 loss to Atlanta, Simpson finds himself back in the minors. Seth Martinez and Freddy Tarnok were called up from Jacksonville to supplement the Marlins bullpen.
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Marlins' Josh Simpson: Nabs win in relief
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Simpson (2-0) picked up the win Friday over the Brewers, striking out one in a perfect sixth inning.
The 27-year-old southpaw has emerged as a strong option in the Marlins' bullpen since his rough big-league debut June 21 against Atlanta. Over his last 10 appearances and 11 innings, Simpson has posted a 0.82 ERA, 0.91 WHIP and 15:5 K:BB while recording two wins and a hold.
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Marlins' Josh Simpson: Selected from Triple-A
Rotowire
The Marlins selected Simpson's contract from Triple-A Jacksonville on Saturday.
Simpson will join the Marlins' bullpen after logging a 3.41 ERA and 1.03 WHIP across 31.2 innings in Triple-A. He'll likely work in middle relief while in Miami, and he will replace Robinson Pina on both the 26-man and 40-man rosters.
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Marlins' Josh Simpson: Making push for bullpen spot
Rotowire
Simpson walked one and struck out five over 2.1 scoreless, no-hit innings in Thursday's Grapefruit League game against the Astros.
The 27-year-old southpaw lost his spot on the 40-man roster during the offseason, but Simpson's performance in camp -- plus the Marlins' lack of established relief options from the left side -- has put him back on the radar. Simpson has a 12:4 K:BB through 9.1 Grapefruit League innings, and he's out-pitched Anthony Veneziano, who has an 8:7 K:BB in 9.2 spring frames. If Simpson does break camp on the 26-man roster, he may work in long relief behind an injury-ravaged rotation.
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Marlins' Josh Simpson: Cast off 40-man
Rotowire
Simpson cleared waivers and was outrighted off the Marlins' 40-man roster Monday.
A 27-year-old southpaw, Simpson had surgery in April to repair the ulnar nerve in his left elbow and was able to return late in the year with a rehab assignment before being assigned to Triple-A. Simpson logged a 7.62 ERA, 1.77 WHIP and a 19:7 K:BB in his final 13 innings last season and has never reached the big leagues.
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Marlins' Josh Simpson: Reinstated, sent to Triple-A
Rotowire
The Marlins activated Simpson (elbow) from the 60-day injured list and optioned him to Triple-A Jacksonville on Tuesday.
The left-hander had the elbow issue surface in February and underwent surgery to repair the ulnar nerve in late April, but he's been fully cleared after an eight-appearance rehab assignment. Simpson surrendered six runs with an 11:8 K:BB across 8.2 innings during the rehab stint, so he'll be sent to Triple-A rather than joining Miami's bullpen.
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Marlins' Josh Simpson: Starting rehab assignment
Rotowire
Simpson (elbow) is scheduled to begin a rehab assignment Tuesday with Single-A Jupiter, Christina De Nicola of MLB.com reports.
Simpson had already been rehabbing at the Marlins' facility in Jupiter, Fla., and after throwing two innings of live batting practice last Wednesday, he's been given the green light to make a one-inning rehab appearance Tuesday. The left-hander has been out since late April while recovering from surgery to address left elbow neuritis and will require multiple rehab appearances before being activated from the 60-day injured list.
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Marlins' Josh Simpson: Facing hitters
Rotowire
Simpson (elbow) will throw a live bullpen session Saturday with Single-A Jupiter, Christina De Nicola of MLB.com reports.
Simpson has been cleared to face batters after completing a pair of bullpens within the last week. While he threw 35 pitches in his previous session, Simpson is expected to throw only 25 pitches Saturday. The southpaw underwent elbow surgery in late April, but he is expected to pitch again in 2024.
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Marlins' Josh Simpson: Ramping up
Rotowire
Simpson (elbow) threw a 35-pitch bullpen Tuesday, Christina De Nicola of MLB.com reports.
Tuesday's session marked Simpson's second bullpen since undergoing elbow surgery in late April. The lefty is expected to complete up to two more sessions before being cleared to face hitters and still appears multiple weeks away from being activated.
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Marlins' Josh Simpson: Throwing off mound
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Simpson (elbow) threw a 20-pitch bullpen session July 9, MLB.com reports.
Simpson opened the season on the injured list after being diagnosed with left elbow neuritis, but he appeared to be tracking toward a brief stay on the shelf. However, after making a rehab appearance April 6, Simpson incurred a setback and ultimately underwent surgery later that month. Nearly three months later, Simpson is finally starting to make some real progress in the recovery process as he conducts his rehab at the Marlins' facility in Jupiter, Fla. He could be cleared to start facing hitters in live batting practice shortly after the All-Star break.
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Marlins' Josh Simpson: Begins throwing program
Rotowire
Simpson (elbow) has started throwing, Christina De Nicola of MLB.com reports.
Simpson has been shut down since April, when he underwent surgery to repair the ulnar nerve in his left elbow. However, he's begun throwing at Single-A Jupiter. He's on track to return in late July or early August.
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Marlins' Josh Simpson: Set for elbow surgery
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Simpson will undergo surgery Tuesday to repair the ulnar nerve in his left elbow, Christina De Nicola of MLB.com reports.
It's expected to be around three months before Simpson will be ready to pitch in games again, so this will put him out at least until after the All-Star break. The southpaw initially suffered the injury during spring training and made an unsuccessful attempt at resting and rehabbing the injury before eventually opting for surgery.
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Marlins' Josh Simpson: Moved to 60-day IL
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The Marlins transferred Simpson (elbow) to the 60-day injured list Saturday.
Simpson started the season on the 15-day IL with left elbow ulnar neuritis. He made an appearance with Single-A Jupiter on April 6 and appeared close to returning to the Marlins' bullpen, but the left-hander hasn't pitched since that outing. Right-hander Kyle Tyler was selected from Triple-A Jacksonville in a corresponding move, and Tyler will fill in for Simpson in Miami's bullpen.
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Marlins' Josh Simpson: Set for bullpen session
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Simpson (elbow) is expected to throw a bullpen session later this week, MLB.com reports.
Simpson opened the season on the 15-day injured list while recovering from left elbow neuritis, but he appeared in line for close to a minimum-length stay on the shelf after he was able to begin a rehab assignment with Single-A Jupiter on April 6. However, he experienced a setback during that one-inning outing and hasn't pitched since. The setback doesn't appear to be a major one given that Simpson should get back on the mound soon, but he still may be around a week away from restarting his rehab assignment.
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Marlins' Josh Simpson: Starting rehab assignment
Rotowire
Simpson (elbow) will begin a rehab assignment with Single-A Jupiter on Saturday, Jordan McPherson of the Miami Herald reports.
The left-handed reliever has been working his way back from an elbow issue and is finally ready to test himself in a game setting. Simpson missed all of spring training, so he'll likely require a handful of rehab appearances before becoming an option for the Marlins bullpen.
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Marlins' Josh Simpson: Slated for bullpen session
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Simpson (elbow) will throw a bullpen session Saturday, Jordan McPherson of the Miami Herald reports.
Simpson has dealt with a left elbow issue since late February and began the season on the injured list. He looks to be making nice progress, though, and could be ready for a rehab assignment soon.
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Marlins' Josh Simpson: Placed on injured list
Rotowire
The Marlins placed Simpson on the 15-day injured list Thursday with left elbow ulnar neuritis.
Simpson seemed likely to begin the season with a middle-relief role in the bullpen for Miami, but he dealt with elbow discomfort during spring training and will open the season on the IL. According to MLB.com, Simpson was able to throw last week while hitters stood in the batter's box, so it may not be long before he's ready to head out on a minor-league rehab assignment.
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