X0306 4 2012-12-19 0 0000320575 PIONEER ENERGY SERVICES CORP PES 0001185173 LOCKE STACY 1250 N E LOOP 410 #1000 SAN ANTONIO TX 78209 1 1 0 0 President & CEO Common Stock 2012-12-19 5 G 0 E 46000 0 D 481701 D Common Stock 2012-12-21 5 G 0 E 138334 0 D 343367 D Common Stock 184334 I By Locke Children's Trust Employee stock option (right to buy) 14.58 2015-08-18 Common stock 98000 98000 D Employee stock option (right to buy) 14.54 2016-06-05 Common stock 120000 120000 D Employee stock option (right to buy) 14.07 2017-05-14 Common stock 200000 200000 D Employee stock option (Right to buy) 17.07 2018-08-28 Common stock 180000 180000 D Employee stock option (right to buy) 3.84 2019-03-02 Common stock 236000 236000 D Employee stock option (right to buy) 8.86 2020-02-02 Common stock 181800 181800 D Employee stock option (right to buy) 9.01 2021-02-02 Common stock 155919 155919 D Employee stock option (Right to buy) 8.92 2022-01-31 Common stock 191697 191697 D The option becomes exercisable in three equal installments on January 31, 2013, 2014 and 2015. All options are fully exercisable at 12-21-2012. The options become exercisable in three equal installments on February 2, 2011, 2012 and 2013. The option becomes exercisable in three equal installments on February 2, 2012, 2013 and 2014. This transaction involved a gift of securities by the reporting person to The Stacy and Aimee Locke Children's Trust of 2012 (the "Locke Children's Trust"). The reporting person's spouse is the trustee of the Locke Children's Trust. Wm. Stacy Locke 2012-12-21