Seagate Technology PLC's shares rose more than 2 percent after hours on Monday after a regulatory filing showed that investor David Einhorn, through his firm Greenlight Capital Inc., increased his stake in the hard-disk drive maker.
Greenlight now owns 23.1 million shares, or 5.4 percent of Seagate's outstanding stock, as of June 1, according to the filing. Greenlight declined to comment beyond the filing.
Seagate's shares regained 60 cents after hours. They had ended regular trading down 83 cents at $22.56.