Photronics, Inc. engages in the manufacture of photomasks. It manufactures of semiconductors and flat panel displays, and are used as masters to transfer circuit patterns onto semiconductor wafers and flat panel substrates during the fabrication of integrated circuits, and a variety of flat panel displays, and to a lesser extent, other types of electrical and optical components. Read More The company operates principally from nine manufacturing facilities; two of which are located in Europe, three in Taiwan, one in Korea, and three in the United States. Photronics was founded by Constantine S. Macricostas in 1969 and is headquartered in Brookfield, CT. The listed name for PLAB is Photronics, Inc. Common Stock.