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| Latest Insider Trading | Top Insider Trading Recent Week | Top 10% Owner Trading Recent Week | Filter
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| Ticker | Owner | Relationship | Date | Transaction | Cost  |
#Shares | Value ($) | #Shares Total | SEC Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| NGS | Taylor Stephen Charles | Director | Dec 10 '25 | Sale | 33.16 | 10,000 | 331,600 | 285,432 | Dec 12 08:39 AM |
| NGS | Taylor Stephen Charles | Director | Dec 11 '25 | Sale | 33.54 | 10,000 | 335,400 | 275,432 | Dec 12 08:39 AM |
| NGS | Taylor Stephen Charles | Director | Dec 11 '25 | Proposed Sale | 33.54 | 10,000 | 335,400 | Dec 11 03:28 PM | |
| NGS | Taylor Stephen Charles | Director | Dec 10 '25 | Proposed Sale | 33.16 | 10,000 | 331,600 | Dec 10 03:27 PM | |
| NGS | Taylor Stephen Charles | Director | Dec 04 '25 | Sale | 32.12 | 20,000 | 642,400 | 295,432 | Dec 05 10:51 AM |
| NGS | Taylor Stephen Charles | Director | Dec 04 '25 | Proposed Sale | 32.12 | 20,000 | 642,400 | Dec 04 04:00 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 19 '25 | Sale | 30.31 | 10,000 | 303,100 | 325,432 | Nov 20 04:17 PM |
| NGS | Taylor Stephen Charles | Director | Nov 20 '25 | Sale | 31.37 | 10,000 | 313,700 | 315,432 | Nov 20 04:17 PM |
| NGS | Taylor Stephen Charles | Director | Nov 20 '25 | Proposed Sale | 31.38 | 10,000 | 313,787 | Nov 20 02:00 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 19 '25 | Proposed Sale | 30.31 | 10,000 | 303,100 | Nov 19 03:54 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 17 '25 | Sale | 31.01 | 10,000 | 310,069 | 335,432 | Nov 18 04:11 PM |
| NGS | Taylor Stephen Charles | Director | Nov 17 '25 | Proposed Sale | 31.01 | 10,000 | 310,069 | Nov 17 04:14 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 10 '25 | Proposed Sale | 29.77 | 18,748 | 558,095 | Nov 10 04:28 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 06 '25 | Sale | 29.00 | 100 | 2,900 | 375,332 | Nov 07 04:52 PM |
| NGS | Taylor Stephen Charles | Director | Nov 07 '25 | Sale | 29.06 | 11,152 | 324,054 | 364,180 | Nov 07 04:52 PM |
| NGS | Taylor Stephen Charles | Director | Nov 07 '25 | Proposed Sale | 29.06 | 11,152 | 324,051 | Nov 07 04:35 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 06 '25 | Proposed Sale | 29.00 | 100 | 2,900 | Nov 06 04:30 PM | |
| NGS | Taylor Stephen Charles | Director | Sep 26 '25 | Sale | 28.50 | 7,915 | 225,586 | 375,432 | Sep 26 03:49 PM |
| NGS | Taylor Stephen Charles | Director | Sep 26 '25 | Proposed Sale | 28.50 | 7,915 | 225,591 | Sep 26 02:20 PM | |
| NGS | Taylor Stephen Charles | Director | Sep 25 '25 | Sale | 28.50 | 759 | 21,632 | 383,347 | Sep 25 04:29 PM |
| NGS | Taylor Stephen Charles | Director | Sep 25 '25 | Proposed Sale | 28.50 | 759 | 21,631 | Sep 25 04:14 PM | |
| NGS | Taylor Stephen Charles | Director | Sep 24 '25 | Sale | 28.50 | 1,326 | 37,791 | 384,106 | Sep 24 04:33 PM |
| NGS | Taylor Stephen Charles | Director | Sep 24 '25 | Proposed Sale | 28.50 | 1,326 | 37,791 | Sep 24 04:01 PM | |
| NGS | Taylor Stephen Charles | Director | Sep 23 '25 | Sale | 27.95 | 11,457 | 320,216 | 385,432 | Sep 23 04:13 PM |
| NGS | Taylor Stephen Charles | Director | Sep 23 '25 | Proposed Sale | 28.01 | 10,000 | 280,147 | Sep 23 03:51 PM | |
| NGS | Taylor Stephen Charles | Director | Sep 19 '25 | Sale | 27.50 | 63 | 1,732 | 396,889 | Sep 19 05:49 PM |
| NGS | Taylor Stephen Charles | Director | Sep 18 '25 | Sale | 27.50 | 1,638 | 45,046 | 396,952 | Sep 18 04:29 PM |
| NGS | Taylor Stephen Charles | Director | Sep 17 '25 | Sale | 27.51 | 6,553 | 180,253 | 398,590 | Sep 17 04:37 PM |
| NGS | Taylor Stephen Charles | Director | Sep 16 '25 | Sale | 27.50 | 289 | 7,948 | 405,143 | Sep 16 04:42 PM |
| NGS | Taylor Stephen Charles | Director | Sep 16 '25 | Proposed Sale | 27.50 | 10,000 | 275,000 | Sep 16 01:45 PM | |
| NGS | Taylor Stephen Charles | Director | Sep 04 '25 | Proposed Sale | 27.00 | 10,000 | 270,018 | Sep 04 05:29 PM | |
| NGS | Taylor Stephen Charles | Director | Sep 04 '25 | Sale | 27.00 | 10,000 | 270,018 | 403,334 | Sep 04 05:22 PM |
| NGS | Taylor Stephen Charles | Director | Aug 22 '25 | Proposed Sale | 26.25 | 20,000 | 525,060 | Aug 22 02:32 PM | |
| NGS | Taylor Stephen Charles | Director | Aug 22 '25 | Sale | 26.25 | 20,000 | 525,060 | 413,334 | Aug 22 01:11 PM |
| NGS | Taylor Stephen Charles | Director | May 15 '25 | Sale | 24.90 | 25,000 | 622,500 | 433,334 | May 16 02:43 PM |
| NGS | Taylor Stephen Charles | Director | May 15 '25 | Proposed Sale | 24.91 | 25,000 | 622,627 | May 15 04:10 PM | |
| NGS | Taylor Stephen Charles | Director | Jan 21 '25 | Sale | 28.80 | 19,400 | 558,649 | 438,387 | Jan 22 01:34 PM |
| NGS | Taylor Stephen Charles | Director | Jan 21 '25 | Proposed Sale | 29.01 | 10,000 | 290,095 | Jan 21 11:37 AM | |
| NGS | Taylor Stephen Charles | Director | Dec 12 '24 | Sale | 27.15 | 10,000 | 271,500 | 457,787 | Dec 16 02:30 PM |
| NGS | Taylor Stephen Charles | Director | Dec 12 '24 | Proposed Sale | 27.15 | 10,000 | 271,515 | Dec 12 02:39 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 22 '24 | Sale | 28.00 | 10,000 | 280,000 | 468,387 | Nov 26 06:26 PM |
| NGS | Taylor Stephen Charles | Director | Nov 25 '24 | Sale | 28.50 | 600 | 17,100 | 467,787 | Nov 26 06:26 PM |
| NGS | Taylor Stephen Charles | Director | Nov 25 '24 | Proposed Sale | 28.50 | 10,000 | 285,000 | Nov 25 04:44 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 19 '24 | Sale | 25.50 | 6,516 | 166,158 | 518,387 | Nov 21 06:56 PM |
| NGS | Taylor Stephen Charles | Director | Nov 20 '24 | Sale | 26.00 | 1,521 | 39,546 | 516,866 | Nov 21 06:56 PM |
| NGS | Taylor Stephen Charles | Director | Nov 21 '24 | Sale | 26.89 | 38,479 | 1,034,777 | 478,387 | Nov 21 06:56 PM |
| NGS | Taylor Stephen Charles | Director | Nov 21 '24 | Proposed Sale | 26.64 | 40,000 | 1,065,600 | Nov 21 02:43 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 20 '24 | Proposed Sale | 26.00 | 10,000 | 260,000 | Nov 20 02:38 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 15 '24 | Sale | 25.01 | 10,042 | 251,110 | 528,345 | Nov 18 06:51 PM |
| NGS | Taylor Stephen Charles | Director | Nov 18 '24 | Sale | 25.51 | 3,442 | 87,809 | 524,903 | Nov 18 06:51 PM |
| NGS | Taylor Stephen Charles | Director | Nov 15 '24 | Proposed Sale | 25.00 | 20,000 | 500,000 | Nov 15 04:45 PM | |
| NGS | Taylor Stephen Charles | Director | Nov 11 '24 | Sale | 24.50 | 3,096 | 75,853 | 545,291 | Nov 13 06:14 PM |
| NGS | Taylor Stephen Charles | Director | Nov 12 '24 | Sale | 24.51 | 4,713 | 115,506 | 540,578 | Nov 13 06:14 PM |
| NGS | Taylor Stephen Charles | Director | Nov 13 '24 | Sale | 24.50 | 2,191 | 53,680 | 538,387 | Nov 13 06:14 PM |
| NGS | Taylor Stephen Charles | Director | Nov 11 '24 | Proposed Sale | 24.50 | 10,000 | 245,003 | Nov 12 10:09 AM | |
| NGS | Taylor Stephen Charles | Director | Aug 26 '24 | Sale | 22.00 | 3,181 | 69,982 | 548,387 | Aug 28 04:27 PM |
| NGS | Taylor Stephen Charles | Director | Aug 20 '24 | Sale | 22.14 | 4,690 | 103,837 | 551,568 | Aug 22 03:13 PM |
| NGS | Taylor Stephen Charles | Director | Aug 20 '24 | Proposed Sale | 22.14 | 20,000 | 442,800 | Aug 20 04:37 PM | |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jun 07 '22 | Sale | 15.00 | 3,918 | 58,770 | 511,259 | Jun 08 05:17 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Mar 15 '21 | Option Exercise | 0.00 | 9,317 | 0 | 102,342 | Mar 17 06:51 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Mar 29 '20 | Option Exercise | 0.00 | 10,973 | 0 | 93,025 | Mar 31 08:53 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Mar 15 '20 | Option Exercise | 0.00 | 9,317 | 0 | 82,052 | Mar 18 06:01 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Feb 14 '20 | Option Exercise | 0.00 | 21,139 | 0 | 72,735 | Feb 19 08:34 PM |
| NGS | Taylor Stephen Charles | CEO | Mar 15 '19 | Option Exercise | 0.00 | 9,317 | 0 | 51,596 | Mar 19 05:04 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Feb 14 '19 | Option Exercise | 0.00 | 21,140 | 0 | 42,279 | Feb 28 03:27 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Feb 05 '19 | Option Exercise | 7.84 | 2,720 | 21,325 | 323,382 | Feb 06 03:08 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Feb 05 '19 | Sale | 17.00 | 2,720 | 46,240 | 320,662 | Feb 06 03:08 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 30 '19 | Option Exercise | 7.84 | 348 | 2,728 | 321,010 | Jan 30 05:42 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 28 '19 | Option Exercise | 7.84 | 1,110 | 8,702 | 321,772 | Jan 30 05:42 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 29 '19 | Option Exercise | 7.84 | 4,905 | 38,455 | 325,567 | Jan 30 05:42 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 29 '19 | Sale | 17.05 | 4,905 | 83,630 | 320,662 | Jan 30 05:42 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 28 '19 | Sale | 17.00 | 1,110 | 18,870 | 320,662 | Jan 30 05:42 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 30 '19 | Sale | 17.00 | 348 | 5,916 | 320,662 | Jan 30 05:42 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 23 '19 | Option Exercise | 9.95 | 1,846 | 18,368 | 322,508 | Jan 25 05:43 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 25 '19 | Option Exercise | 9.11 | 4,974 | 45,314 | 323,656 | Jan 25 05:43 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 24 '19 | Option Exercise | 9.95 | 1,205 | 11,990 | 321,867 | Jan 25 05:43 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 24 '19 | Sale | 17.00 | 1,205 | 20,485 | 320,662 | Jan 25 05:43 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 25 '19 | Sale | 17.14 | 4,974 | 85,254 | 320,662 | Jan 25 05:43 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 23 '19 | Sale | 17.21 | 1,846 | 31,770 | 320,662 | Jan 25 05:43 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 17 '19 | Option Exercise | 9.95 | 10,311 | 102,594 | 330,973 | Jan 22 05:06 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 18 '19 | Option Exercise | 9.95 | 12,444 | 123,818 | 333,106 | Jan 22 05:06 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 22 '19 | Option Exercise | 9.95 | 1,200 | 11,940 | 321,862 | Jan 22 05:06 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 22 '19 | Sale | 17.48 | 1,200 | 20,976 | 320,662 | Jan 22 05:06 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 18 '19 | Sale | 17.89 | 12,444 | 222,623 | 320,662 | Jan 22 05:06 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 17 '19 | Sale | 17.50 | 10,311 | 180,442 | 320,662 | Jan 22 05:06 PM |
| NGS | Taylor Stephen Charles | CEO | Sep 06 '18 | Option Exercise | 17.51 | 4,000 | 70,040 | 320,662 | Sep 06 03:49 PM |
| NGS | Taylor Stephen Charles | CEO | Aug 29 '18 | Option Exercise | 17.51 | 13,776 | 241,218 | 330,438 | Aug 31 04:00 PM |
| NGS | Taylor Stephen Charles | CEO | Aug 29 '18 | Sale | 22.01 | 13,776 | 303,210 | 316,662 | Aug 31 04:00 PM |
| NGS | Taylor Stephen Charles | CEO | Aug 23 '18 | Option Exercise | 17.51 | 3,320 | 58,133 | 319,982 | Aug 27 06:20 PM |
| NGS | Taylor Stephen Charles | CEO | Aug 23 '18 | Sale | 22.51 | 1,306 | 29,398 | 318,676 | Aug 27 06:20 PM |
| NGS | Taylor Stephen Charles | CEO | Aug 24 '18 | Sale | 22.45 | 1,500 | 33,675 | 317,176 | Aug 27 06:20 PM |
| NGS | Taylor Stephen Charles | CEO | Aug 27 '18 | Sale | 22.04 | 514 | 11,329 | 316,662 | Aug 27 06:20 PM |
| NGS | Taylor Stephen Charles | CEO | Aug 21 '18 | Option Exercise | 17.51 | 3,904 | 68,359 | 320,566 | Aug 23 11:29 AM |
| NGS | Taylor Stephen Charles | CEO | Aug 21 '18 | Sale | 22.02 | 2,704 | 59,542 | 316,662 | Aug 23 11:29 AM |
| NGS | Taylor Stephen Charles | CEO | Feb 14 '18 | Option Exercise | 0.00 | 21,139 | 0 | 21,139 | Feb 16 05:33 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Dec 19 '17 | Sale | 25.17 | 16,212 | 408,056 | 277,088 | Dec 20 07:00 PM |
| NGS | Taylor Stephen Charles | CEO | Oct 03 '17 | Sale | 28.58 | 3,874 | 110,719 | 277,088 | Oct 04 06:03 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jun 30 '17 | Sale | 25.00 | 4,843 | 121,075 | 284,245 | Jul 05 01:37 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jul 03 '17 | Sale | 24.99 | 7,157 | 178,853 | 277,088 | Jul 05 01:37 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 11 '17 | Option Exercise | 20.06 | 19,914 | 399,475 | 297,738 | Jan 12 04:38 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 03 '17 | Sale | 32.32 | 5,974 | 193,083 | 291,764 | Jan 05 06:41 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 04 '17 | Sale | 32.02 | 6,052 | 193,785 | 285,712 | Jan 05 06:41 PM |
| NGS | Taylor Stephen Charles | Chief Executive Officer | Jan 05 '17 | Sale | 31.95 | 7,888 | 251,983 | 277,824 | Jan 05 06:41 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 22 '16 | Option Exercise | 14.22 | 15,000 | 213,300 | 347,543 | Mar 24 05:15 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 22 '16 | Sale | 21.33 | 15,000 | 319,920 | 332,543 | Mar 24 05:15 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 30 '15 | Sale | 19.07 | 2,115 | 40,333 | 265,431 | Apr 02 07:22 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 31 '15 | Sale | 19.27 | 4,000 | 77,080 | 267,546 | Apr 01 06:20 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 27 '15 | Sale | 19.00 | 1,000 | 19,000 | 271,546 | Mar 30 06:22 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 24 '15 | Sale | 20.06 | 2,309 | 46,319 | 272,546 | Mar 26 06:14 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 18 '15 | Option Exercise | 9.22 | 45,000 | 414,900 | 319,855 | Mar 20 09:16 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 18 '15 | Sale | 18.33 | 28,256 | 517,932 | 291,599 | Mar 20 09:16 PM |
| NGS | Taylor Stephen Charles | President and CEO | Mar 20 '15 | Sale | 19.53 | 5,000 | 97,650 | 286,599 | Mar 20 09:16 PM |
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