| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| SD | EVP and Chief Operating Office | Sep 01, 2014 | Option Exercise | $5.24 | 18,294 | 95,861 | 483,839 | Sep 02, 2014, 05:44 PM |
| SD | EVP and Chief Operating Office | Jul 13, 2014 | Option Exercise | $6.58 | 6,626 | 43,599 | 490,332 | Jul 15, 2014, 04:45 PM |
| SD | EVP and Chief Operating Office | Jul 01, 2014 | Option Exercise | $7.08 | 1,793 | 12,694 | 496,958 | Jul 03, 2014, 01:24 PM |
| SD | EVP & Chief Operating Officer | Apr 01, 2014 | Option Exercise | $6.15 | 22,086 | 135,869 | 495,165 | Apr 03, 2014, 04:27 PM |
| SD | EVP & Chief Operating Officer | Jan 15, 2014 | Option Exercise | $5.94 | 5,445 | 32,343 | 332,673 | Jan 16, 2014, 04:58 PM |
| SD | EVP & Chief Operating Officer | Jan 13, 2014 | Option Exercise | $5.91 | 5,336 | 31,536 | 338,118 | Jan 15, 2014, 04:34 PM |
| SD | EVP & Chief Operating Officer | Jan 02, 2014 | Option Exercise | $5.95 | 2,911 | 17,307 | 343,454 | Jan 06, 2014, 04:20 PM |
| SD | EVP & Chief Operating Officer | Oct 01, 2013 | Option Exercise | $6.14 | 8,963 | 55,070 | 340,543 | Oct 03, 2013, 04:42 PM |
| SD | EVP & Chief Operating Officer | Sep 01, 2013 | Option Exercise | $5.15 | 12,636 | 65,075 | 331,580 | Sep 04, 2013, 04:06 PM |
| SD | EVP & Chief Operating Officer | Jul 13, 2013 | Option Exercise | $4.87 | 4,972 | 24,214 | 344,216 | Jul 16, 2013, 04:45 PM |
| SD | EVP & Chief Operating Officer | Jul 01, 2013 | Option Exercise | $4.80 | 3,520 | 16,906 | 349,188 | Jul 03, 2013, 04:44 PM |
| SD | EVP - Operations | Apr 01, 2013 | Option Exercise | $5.22 | 6,922 | 36,154 | 345,668 | Apr 03, 2013, 05:12 PM |
| SD | EVP - Operations | Jan 13, 2013 | Option Exercise | $6.86 | 4,658 | 31,954 | 270,545 | Jan 15, 2013, 06:06 PM |
| SD | EVP - Operations | Jan 02, 2013 | Option Exercise | $6.42 | 2,506 | 16,094 | 275,203 | Jan 04, 2013, 04:51 PM |
| SD | EVP - Operations | Oct 01, 2012 | Option Exercise | $7.06 | 7,583 | 53,506 | 272,697 | Oct 03, 2012, 06:11 PM |
| SD | EVP - Operations | Sep 01, 2012 | Option Exercise | $6.57 | 12,287 | 80,726 | 269,475 | Sep 05, 2012, 04:10 PM |
| SD | EVP - OPERATIONS | Jul 02, 2012 | Option Exercise | $6.54 | 2,330 | 15,231 | 216,401 | Jul 05, 2012, 04:24 PM |
| SD | EVP - OPERATIONS | Apr 02, 2012 | Option Exercise | $8.00 | 1,905 | 15,234 | 214,071 | Apr 04, 2012, 07:01 PM |
| PSTR | CEO and President | Apr 27, 2011 | Sale | $7.83 | 2,768 | 21,673 | 114,410 | Apr 28, 2011, 06:43 PM |
| PSTR | CEO and President | Sep 24, 2010 | Sale | $3.32 | 7,385 | 24,518 | 105,178 | Sep 28, 2010, 04:35 PM |
| Symbol | Relationship | Date | Transaction | Value($) |
| SD | EVP and Chief Operating Office | Sep 01, 2014 | Option Exercise | 95,861 |
| SD | EVP and Chief Operating Office | Jul 13, 2014 | Option Exercise | 43,599 |
| SD | EVP and Chief Operating Office | Jul 01, 2014 | Option Exercise | 12,694 |
| SD | EVP & Chief Operating Officer | Apr 01, 2014 | Option Exercise | 135,869 |
| SD | EVP & Chief Operating Officer | Jan 15, 2014 | Option Exercise | 32,343 |
| SD | EVP & Chief Operating Officer | Jan 13, 2014 | Option Exercise | 31,536 |
| SD | EVP & Chief Operating Officer | Jan 02, 2014 | Option Exercise | 17,307 |
| SD | EVP & Chief Operating Officer | Oct 01, 2013 | Option Exercise | 55,070 |
| SD | EVP & Chief Operating Officer | Sep 01, 2013 | Option Exercise | 65,075 |
| SD | EVP & Chief Operating Officer | Jul 13, 2013 | Option Exercise | 24,214 |
| SD | EVP & Chief Operating Officer | Jul 01, 2013 | Option Exercise | 16,906 |
| SD | EVP - Operations | Apr 01, 2013 | Option Exercise | 36,154 |
| SD | EVP - Operations | Jan 13, 2013 | Option Exercise | 31,954 |
| SD | EVP - Operations | Jan 02, 2013 | Option Exercise | 16,094 |
| SD | EVP - Operations | Oct 01, 2012 | Option Exercise | 53,506 |
| SD | EVP - Operations | Sep 01, 2012 | Option Exercise | 80,726 |
| SD | EVP - OPERATIONS | Jul 02, 2012 | Option Exercise | 15,231 |
| SD | EVP - OPERATIONS | Apr 02, 2012 | Option Exercise | 15,234 |
| PSTR | CEO and President | Apr 27, 2011 | Sale | 21,673 |
| PSTR | CEO and President | Sep 24, 2010 | Sale | 24,518 |