The Red Sox acquired Sims from the Reds on Tuesday in exchange for right-hander Ovis Portes, Robert Murray of FanSided.com reports.
Sims has posted a 3.57 ERA and 40:20 K:BB over 35.1 innings in 2024 as a member of the Reds bullpen. The pending free agent boasts a career 27.5 percent strikeout rate but also an 11.9 percent walk rate. He'll slot in as a setup man for Boston in front of closer Kenley Jansen.