Mauna Loa Macadamia Nut Corporation is the world's largest processor of macadamia seeds. The American company has been a subsidiary of The Hershey Company since 2004. The company takes its name from the volcano Mauna Loa. Their headquarters and main processing plant are near the mountain, south of Hilo in the Puna District of the island of Hawaiʻi, known as the Big Island.