Mayville Engineering Company. Replay the stock market charts of MEC day by day, back to 2003. Open long and short positions without spending any money. Mayville Engineering Company, Inc., together with its subsidiaries, operates as a contract manufacturer that serves the heavy and medium duty commercial vehicle, construction and access equipment, powersports, agriculture, military, and other end markets in the United States. The company provides a range of prototyping and tooling, production fabrication, coating, assembly, and aftermarket components. It also supplies engineered components to original equipment manufacturers. The company was founded in 1945 and is headquartered in Mayville, Wisconsin.