Seagate Technology PLC (commonly referred to as Seagate) is an American data storage company. It was incorporated in 1978, as Shugart Technology. Since 2010, the company is incorporated in Dublin, Ireland, with operational headquarters in Cupertino, California, United States. Stephen J. Luczo is the current Chairman of the board of directors and David Mosley is CEO. In January 2009, Luczo, Seagate’s chairman, was appointed president and chief executive officer, returning him to the role he held at Seagate from 1998 to 2004. On Oct 2, 2017 COO David Mosley was appointed CEO and Luczo stepped down from that role.

It developed the first 5.25-inch hard disk drive (HDD), the 5-megabyte ST-506, in 1980. They were a major supplier in the microcomputer market during the 1980s, especially after the introduction of the IBM XT in 1983. Today Seagate, along with its competitor Western Digital, dominates the HDD market. Much of their growth has come through their acquisition of competitors. In 1989, Seagate acquired Control Data Corporation’s Imprimis division, the makers of CDC’s HDD products. Seagate acquired Conner Peripherals in 1996, Maxtor in 2006 and Samsung’s HDD business in 2011.