X0306 4 2015-08-07 0 0001137789 Seagate Technology plc STX 0001216771 PARK CHONG SUP SEAGATE TECHNOLOGY PLC 10200 S. DE ANZA BOULEVARD CUPERTINO CA 95014 1 0 0 0 Ordinary Shares 2015-10-21 4 A 0 5182 0.00 A 6707 D Ordinary Shares 2015-10-21 4 F 0 1525 38.52 D 5182 D Ordinary Shares 2015-08-07 4 G 0 2100 0.00 D 32735 I Park Family Trust Consists of a grant of restricted share units awarded to the Reporting Person under the Amended and Restated Seagate Technology plc 2012 Equity Incentive Plan for no consideration. Each restricted share unit represents a contingent right to receive one Ordinary Share of the Issuer. Subject to the Reporting Person's continuous service with the Issuer, shares will be released to the Reporting Person on the earlier of (i) one year from the date of grant and (ii) one day prior to the next annual general meeting of the shareholders of the Issuer following the end of the fiscal year ending with July 1, 2016. On October 21, 2015, the Reporting Person transferred 2710 Ordinary Shares previously owned directly to the Park Family Trust. These shares are being disposed of pursuant to Issuer's net share settlement program for taxes incurred by the Reporting Person upon the vesting of equity awards previously reported on one or more Forms 4. /s/Jolene A. Mendelsohn by power-of-attorney 2015-10-23