US-based private equity firm Grand Crossing Capital Partners has invested in Outlaw Beverage, an energy drink brand.

Financial details were not divulged by both the companies.

This is the fourth investment by Grand Crossing. Earlier, it invested in Kona Deep, a brand that sells deep ocean water in bottles.

"We look forward to helping the Outlaw team grow their unique brand and business."

Grand Crossing Capital is based in Chicago and offers support as well as financial assistance to consumer and retail firms.

The company claimed that it provides Outlaw with "valuable strategic partnership without the pressure for short-term wins", reported foodbev.com.

Outlaw Energy is available in various flavours, such as guarana and taurine. The drink is sold through convenience stores in western US and Mexico.

Grand Crossing managing partner Brian Jacobsen was quoted by the website as saying: "We are delighted to be partnering with entrepreneurs that have proven track records of success in the beverage industry. With favourable trends in the energy drink category, we look forward to helping the Outlaw team grow their unique brand and business."

Outlaw was established by Doug Weekes and Lance Collins.