MassMutual is first jersey patch sponsor of the Red Sox

Red Sox reach $170 million jersey-patch deal, Mets also interested

Why are the Angels wearing jersey patches with 'FBM' on them? - Los Angeles Times

MassMutual will be the first sponsor to have its logo on Red Sox uniforms - The Boston Globe

Boston Red Sox confirm MassMutual as signature sponsor - SportsPro

MLB Opening Day: Jersey Patches - Foul Or Fair Game?

Boston Red Sox and Springfield-based life insurer, MassMutual partner up

Red Sox will have MassMutual logo on their jerseys beginning in 2023 – Blogging the Red Sox

A $17 million annual deal by the Red Sox stokes debate on the value of jersey patches in a market flooded with options

Boston Red Sox sign BetMGM as first betting sponsor

John Hancock ending long-held Boston Red Sox sponsorship