Goldman analysts also lowered the security's price target to $59 from $67, citing a meaningful deceleration in U.S sales that will more than offset the company's strong international growth.
The investment bank also noted competitive concerns and commodity costs pressuring margins.
The company faces major competition from Coca-Cola (KO - Get Report) as it touts plans to release three energy drinks into Monster's territory. Coca-Cola also holds a large equity stake in Monster and handles Monster's product distribution.
The 20 analysts following the stock give Monster an average rating of overweight and target price of $67.29, according to FactSet. Ratings were disclosed for most of them: nine buys, seven holds and one underweight rating.
Shares of the American energy-drink maker fell 0.69% to $57.52.
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