Charles Johnson, 79, is the San Francisco Giants' principal owner, reportedly with a 25 percent stake in the team. That's believed to be the largest among the team's 32-member ownership group, San Francisco Baseball Associated LP.
Forbes estimates Johnson's worth at $4.7 billion, tied for 72nd-richest American.
His wealth originates from his chairmanship of San Mateo, Calif.-based Franklin Resources Inc., a holding company better known as Franklin Templeton Investments. The investment firm was founded by Johnson's father in 1947, and Johnson took it over at age 24 in 1957 upon his father's retirement and after a two-year stint in the U.S. Army.