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
Rotowire
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
Rotowire
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: 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
Rotowire
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: 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: Managing elbow issue
Rotowire
Manager Skip Schumaker said Sunday that Simpson is dealing with left elbow discomfort that's similar to nerve irritation, Christina De Nicola of MLB.com reports.
Simpson hasn't pitched since Feb. 27, and Schumaker said the club is being cautious since the left-hander "still feels it a little bit." Given the length of the layoff, the 26-year-old will likely need to ramp things up soon to have a chance of being ready by Opening Day.
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Marlins' Josh Simpson: Back to minors
Rotowire
Simpson was optioned to Triple-A Jacksonville on Sunday, Jordan McPherson of the Miami Heraldreports.
The left-hander was called up by Miami on Tuesday but didn't make his MLB debut during his time with the team. Simpson will return to Jacksonville, where he has a 4.50 ERA over 32 innings this year.
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Marlins' Josh Simpson: Returns from IL
Rotowire
Simpson (shoulder) struck out two and allowed no hits and one walk over one inning in his lone appearance since being reinstated from Triple-A Jacksonville's 7-day injured list Saturday.
Simpson was on the IL for nearly three months due to a left shoulder injury. The 25-year-old reliever has yet to make his MLB debut, but he occupies a spot on the Marlins' 40-man roster and could be in the mix for a late-season call-up.
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Marlins' Josh Simpson: Out with shoulder impingement
Rotowire
Simpson is on the 7-day injured list at Triple-A Jacksonville with a left shoulder impingement, Baseball America reports.
A 25-year-old lefty reliever, Simpson logged a 6.55 ERA and 1.91 WHIP in 11 innings across eight appearances before landing on the injured list in early May. He is rehabbing the injury at the team's spring training complex in Florida.
