A small minority stake in the San Francisco Giants has been put up for sale at a valuation of $4 billion.

The Giants are owned by around 30 partners, including former catcher Buster Posey and investor Arctos Sports Partners. Charles B. Johnson, 91, a former chief executive officer of Franklin Templeton Investments, holds the largest stake at about a quarter.

The stake is less than 5% and related to estate planning.

The Giants were purchased in 1992 for $100 million. Since building Oracle Park in downtown San Francisco, the Giants have become one of the more profitable teams in the MLB.