| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| WFT | Director | Apr 27, 2019 | Option Exercise | $0.57 | 12,543 | 7,150 | 175,839 | Apr 30, 2019, 06:18 PM |
| ESV | Director | Apr 11, 2019 | Option Exercise | $16.37 | 1,505 | 24,637 | 28,630 | Apr 15, 2019, 06:48 PM |
| WFT | Director | Sep 21, 2018 | Option Exercise | $2.57 | 8,937 | 22,968 | 188,382 | Sep 24, 2018, 04:31 PM |
| ESV | Director | Jun 01, 2018 | Option Exercise | $6.58 | 2,166 | 14,252 | 62,138 | Jun 05, 2018, 04:25 PM |
| WFT | Director | Sep 22, 2017 | Option Exercise | $4.14 | 6,347 | 26,277 | 135,408 | Sep 25, 2017, 06:45 PM |
| WFT | Director | Sep 24, 2017 | Option Exercise | $4.26 | 800 | 3,408 | 134,608 | Sep 25, 2017, 06:45 PM |
| WFT | Director | Jun 20, 2017 | Option Exercise | $4.08 | 718 | 2,929 | 97,070 | Jun 20, 2017, 05:44 PM |
| ESV | Director | Jun 02, 2017 | Option Exercise | $6.14 | 164 | 1,007 | 43,284 | Jun 05, 2017, 06:35 PM |
| ESV | Director | Jun 01, 2017 | Option Exercise | $6.32 | 1,079 | 6,819 | 41,861 | Jun 05, 2017, 06:35 PM |
| KRA | Director | Mar 02, 2017 | Option Exercise | $27.90 | 3,225 | 89,977 | 3,225 | Mar 03, 2017, 05:12 PM |
| KRA | Director | Oct 31, 2016 | Buy | $25.75 | 4,000 | 103,020 | 21,662 | Oct 31, 2016, 04:09 PM |
| WFT | Director | Sep 27, 2016 | Option Exercise | $5.51 | 800 | 4,408 | 97,788 | Sep 27, 2016, 07:17 PM |
| WFT | Director | Sep 25, 2016 | Option Exercise | $5.83 | 2,400 | 13,992 | 98,588 | Sep 27, 2016, 07:17 PM |
| WFT | Director | Sep 24, 2016 | Option Exercise | $5.83 | 800 | 4,664 | 100,988 | Sep 27, 2016, 07:17 PM |
| ESV | Director | Jun 01, 2016 | Option Exercise | $9.65 | 367 | 3,542 | 29,810 | Jun 08, 2016, 05:09 PM |
| ESV | Director | Jun 03, 2016 | Option Exercise | $9.34 | 142 | 1,326 | 31,945 | Jun 06, 2016, 05:41 PM |
| ESV | Director | Jun 02, 2016 | Option Exercise | $9.38 | 164 | 1,538 | 30,709 | Jun 03, 2016, 05:22 PM |
| ESV | Director | Jun 01, 2016 | Option Exercise | $9.65 | 891 | 8,598 | 29,286 | Jun 03, 2016, 05:22 PM |
| WFT | Director | May 09, 2016 | Buy | $5.29 | 30,000 | 158,700 | 70,056 | May 10, 2016, 04:49 PM |
| KRA | Director | Feb 26, 2016 | Option Exercise | $16.20 | 4,938 | 79,996 | 17,662 | Feb 26, 2016, 02:35 PM |
| WFT | Director | Sep 27, 2015 | Option Exercise | $8.70 | 800 | 6,960 | 40,056 | Sep 28, 2015, 06:24 PM |
| WFT | Director | Sep 24, 2015 | Option Exercise | $8.87 | 800 | 7,096 | 28,856 | Sep 24, 2015, 05:39 PM |
| WFT | Director | Jun 20, 2015 | Option Exercise | $13.19 | 718 | 9,470 | 29,656 | Jun 23, 2015, 04:51 PM |
| ESV | Director | Jun 03, 2015 | Option Exercise | $24.36 | 142 | 3,459 | 26,615 | Jun 05, 2015, 09:40 AM |
| ESV | Director | Jun 02, 2015 | Option Exercise | $24.46 | 164 | 4,011 | 25,379 | Jun 03, 2015, 04:53 PM |
| ESV | Director | Jun 01, 2015 | Option Exercise | $23.40 | 179 | 4,189 | 23,956 | Jun 03, 2015, 04:53 PM |
| KRA | Director | Feb 27, 2015 | Option Exercise | $19.64 | 4,073 | 79,994 | 12,724 | Feb 27, 2015, 11:13 AM |
| WFT | Director | Sep 27, 2014 | Option Exercise | $21.31 | 800 | 17,048 | 30,374 | Sep 29, 2014, 06:33 PM |
| ESV | Director | Jun 03, 2014 | Option Exercise | $53.41 | 142 | 7,584 | 22,400 | Jun 04, 2014, 05:37 PM |
| ESV | Director | Jun 01, 2014 | Option Exercise | $52.66 | 325 | 17,114 | 21,164 | Jun 04, 2014, 05:37 PM |
| HELI | Director | Jan 23, 2014 | Buy | $10.00 | 20,000 | 200,000 | 20,000 | Jan 23, 2014, 04:12 PM |
| ESV | Director | Jun 03, 2013 | Option Exercise | $60.17 | 1,112 | 66,909 | 18,342 | Jun 05, 2013, 08:00 PM |
| ESV | Director | Jun 01, 2012 | Option Exercise | $44.19 | 427 | 18,869 | 15,975 | Jun 05, 2012, 09:04 PM |
| ESV | Director | Nov 30, 2011 | Option Exercise | $35.39 | 19,272 | 682,027 | 29,242 | Dec 02, 2011, 05:43 PM |
| ESV | Director | Nov 30, 2011 | Sale | $52.00 | 19,272 | 1,002,144 | 9,970 | Dec 02, 2011, 05:43 PM |
| Symbol | Relationship | Date | Transaction | Value($) |
| WFT | Director | Apr 27, 2019 | Option Exercise | 7,150 |
| ESV | Director | Apr 11, 2019 | Option Exercise | 24,637 |
| WFT | Director | Sep 21, 2018 | Option Exercise | 22,968 |
| ESV | Director | Jun 01, 2018 | Option Exercise | 14,252 |
| WFT | Director | Sep 22, 2017 | Option Exercise | 26,277 |
| WFT | Director | Sep 24, 2017 | Option Exercise | 3,408 |
| WFT | Director | Jun 20, 2017 | Option Exercise | 2,929 |
| ESV | Director | Jun 02, 2017 | Option Exercise | 1,007 |
| ESV | Director | Jun 01, 2017 | Option Exercise | 6,819 |
| KRA | Director | Mar 02, 2017 | Option Exercise | 89,977 |
| KRA | Director | Oct 31, 2016 | Buy | 103,020 |
| WFT | Director | Sep 27, 2016 | Option Exercise | 4,408 |
| WFT | Director | Sep 25, 2016 | Option Exercise | 13,992 |
| WFT | Director | Sep 24, 2016 | Option Exercise | 4,664 |
| ESV | Director | Jun 01, 2016 | Option Exercise | 3,542 |
| ESV | Director | Jun 03, 2016 | Option Exercise | 1,326 |
| ESV | Director | Jun 02, 2016 | Option Exercise | 1,538 |
| ESV | Director | Jun 01, 2016 | Option Exercise | 8,598 |
| WFT | Director | May 09, 2016 | Buy | 158,700 |
| KRA | Director | Feb 26, 2016 | Option Exercise | 79,996 |
| WFT | Director | Sep 27, 2015 | Option Exercise | 6,960 |
| WFT | Director | Sep 24, 2015 | Option Exercise | 7,096 |
| WFT | Director | Jun 20, 2015 | Option Exercise | 9,470 |
| ESV | Director | Jun 03, 2015 | Option Exercise | 3,459 |
| ESV | Director | Jun 02, 2015 | Option Exercise | 4,011 |
| ESV | Director | Jun 01, 2015 | Option Exercise | 4,189 |
| KRA | Director | Feb 27, 2015 | Option Exercise | 79,994 |
| WFT | Director | Sep 27, 2014 | Option Exercise | 17,048 |
| ESV | Director | Jun 03, 2014 | Option Exercise | 7,584 |
| ESV | Director | Jun 01, 2014 | Option Exercise | 17,114 |
| HELI | Director | Jan 23, 2014 | Buy | 200,000 |
| ESV | Director | Jun 03, 2013 | Option Exercise | 66,909 |
| ESV | Director | Jun 01, 2012 | Option Exercise | 18,869 |
| ESV | Director | Nov 30, 2011 | Option Exercise | 682,027 |
| ESV | Director | Nov 30, 2011 | Sale | 1,002,144 |