MassMutual becomes 'signature sponsor' for Boston Red Sox

After nearly 40 years, John Hancock to step back from sponsorship of Boston Marathon - The Boston Globe

Sustainability and Inclusion MassMutual 2022 Annual Report

NYSportsJournalism.com - NY Yankees Sign $220M Partner, Jersey Patch Deal - Yankees Sign $200M Signature Partner, Sleeve Patch Deal With Starr Insurance

Red Sox to sport MassMutual logo under new partnership - Boston Business Journal

Red Sox play ball with a new signature sponsor - BOStoday

What MLB teams will have uniform ad patches in 2023?

MassMutual, Red Sox announce multiyear partnership

jerseys – Blogging the Red Sox

jerseys – Blogging the Red Sox

Boston Red Sox mascots Wally and Tessie display the patch during a News Photo - Getty Images

Colorful jerseys here to stay: Red Sox president says team not planning future uniform changes, Sports