MFS Investment Management is a asset manager firm based in Boston, Massachusetts that mfs investment management is a global active asset manager offering equity, fixed income and multi-asset strategies to institutional and retail investors. founded in 1924, it created what is regarded as the first us open-end mutual fund. headquartered in boston, mfs is a subsidiary of sun life financial and emphasizes long-term, research-driven active management. They serve clients in United States, Canada, United Kingdom, European Union, Asia-Pacific. MFS Investment Management is listed on The Token Playbook's vetted provider registry at thetokenplaybook.com/registry/mfs-investment-management.