BOULDER, COLO. — The Hershey Co. in a filing this month with the Securities and Exchange Commission said it has invested $6 million in Tri-Us, Inc., which does business as mix1 Beverage Co. The moved followed a $5.8 investment in February 2011, and it has raised Hershey’s ownership interest in Tri-Us to 69%.

Based in Boulder, mix1 makes all-natural protein shakes and lean performance shakes that feature whey protein isolate.