MassMutual is first jersey patch sponsor of the Red Sox

MassMutual lands deal for patch on Red Sox uniforms; Springfield company's deal with $17M yearly (report)

MLB's announced jersey patch deals so far-San Diego Padres: Motorola. Boston Red Sox: MassMutual. Los Angeles Angels: Foundation Building Materials. Arizona Diamondbacks: Avnet : r/baseball

MLB's Red Sox land MassMutual as jersey patch sponsor - Sportcal

Red Sox reportedly sign jersey patch deal with MassMutual

John Hancock ending long-held Boston Red Sox sponsorship

Red Sox reveal first-ever uniform advertisements; MassMutual patches coming in 2023

Boston Red Sox Announce MassMutual Patch on Jerseys Starting in 2023 – SportsLogos.Net News