Chobani is exploring selling a minority stake, including warrants owned by private equity firm TPG Capital LP that account for between 10 percent and 20 percent of the yogurt maker’s equity depending on its financial performance, the people said. Chobani is looking for a strategic investor to help expand its supply chain, distribution, manufacturing base and geographic footprint for its popular yogurts like Flip, which combine yogurt with flavors such as peanut butter and coffee, the people added.