Dawson Geophysical Company

Mays Ray L bought 150 shares of DWSN on 30 June. They now own 108,650 DWSN shares.

Wilks Farris sold 15,547,010 shares of DWSN on 31 December. They now own 0 DWSN shares.

Mays Ray L bought 100,000 shares of DWSN on 27 October. They now own 108,500 DWSN shares.

Clark William Anthony bought 150,000 shares of DWSN on 27 October. They now own 151,850 DWSN shares.

Clark William Anthony bought 550 shares of DWSN on 9 September. They now own 1,850 DWSN shares.

Clark William Anthony bought 500 shares of DWSN on 20 August. They now own 1,300 DWSN shares.

Mays Ray L bought 1,000 shares of DWSN on 18 August. They now own 7,450 DWSN shares.

Mays Ray L bought 1,050 shares of DWSN on 18 August. They now own 8,500 DWSN shares.

Mays Ray L bought 1,000 shares of DWSN on 18 August. They now own 6,450 DWSN shares.

Shaw Ian M. bought 5,000 shares of DWSN on 18 August. They now own 20,000 DWSN shares.

Shaw Ian M. bought 5,000 shares of DWSN on 15 August. They now own 15,000 DWSN shares.

Mays Ray L bought 500 shares of DWSN on 15 August. They now own 4,950 DWSN shares.

Mays Ray L bought 500 shares of DWSN on 15 August. They now own 5,450 DWSN shares.

Clark William Anthony bought 50 shares of DWSN on 13 June. They now own 800 DWSN shares.

Clark William Anthony bought 600 shares of DWSN on 6 June. They now own 750 DWSN shares.

Shaw Ian M. bought 3,500 shares of DWSN on 20 May. They now own 10,000 DWSN shares.

Mays Ray L bought 2,950 shares of DWSN on 20 May. They now own 4,450 DWSN shares.

Krylov Sergei bought 3,055 shares of DWSN on 20 May. They now own 28,415 DWSN shares.

Shaw Ian M. bought 3,645 shares of DWSN on 19 May. They now own 6,500 DWSN shares.

Krylov Sergei bought 2,640 shares of DWSN on 19 May. They now own 25,360 DWSN shares.

Mays Ray L bought 900 shares of DWSN on 19 May. They now own 1,500 DWSN shares.

Krylov Sergei bought 3,555 shares of DWSN on 16 May. They now own 22,720 DWSN shares.

Shaw Ian M. bought 2,855 shares of DWSN on 16 May. They now own 2,855 DWSN shares.

Mays Ray L bought 600 shares of DWSN on 16 May. They now own 600 DWSN shares.

Krylov Sergei bought 19,165 shares of DWSN on 1 October. They now own 19,165 DWSN shares.

Fernandes Jose Carlos bought 19,165 shares of DWSN on 1 October. They now own 19,165 DWSN shares.

Bradley Bruce Franklin bought 19,165 shares of DWSN on 1 October. They now own 19,165 DWSN shares.

Conly Albert S. bought 19,165 shares of DWSN on 1 October. They now own 19,165 DWSN shares.

Clark William Anthony bought 150 shares of DWSN on 28 June. They now own 150 DWSN shares.

Mays Ray L bought 0 shares of DWSN on 20 November. They now own 0 DWSN shares.

Shaw Ian M. bought 0 shares of DWSN on 20 November. They now own 0 DWSN shares.

Wilks Brothers, Llc bought 5,811,765 shares of DWSN on 13 September. They now own 24,609,095 DWSN shares.

Wilks Brothers, Llc sold 5,811,765 shares of DWSN on 13 September. They now own 24,609,095 DWSN shares.

Clark William Anthony bought 0 shares of DWSN on 16 June. They now own 0 DWSN shares.

Wilks Brothers, Llc bought 8,895 shares of DWSN on 14 June. They now own 18,847,330 DWSN shares.

Wilks Brothers, Llc bought 4,438 shares of DWSN on 13 June. They now own 17,650,200 DWSN shares.

Wilks Brothers, Llc bought 4,166 shares of DWSN on 12 June. They now own 17,645,762 DWSN shares.

Wilks Brothers, Llc bought 4,438 shares of DWSN on 12 June. They now own 18,838,435 DWSN shares.

Wilks Brothers, Llc bought 4,166 shares of DWSN on 12 June. They now own 18,833,997 DWSN shares.

Wilks Brothers, Llc bought 1,188,235 shares of DWSN on 24 March. They now own 18,829,831 DWSN shares.

Tobias C Ray sold 25,000 shares of DWSN on 16 August. They now own 0 DWSN shares.

Brata James Kevin sold 25,000 shares of DWSN on 16 August. They now own 0 DWSN shares.

Jumper Stephen C sold 50,000 shares of DWSN on 16 August. They now own 0 DWSN shares.

Conly Albert S. bought 0 shares of DWSN on 12 April. They now own 0 DWSN shares.

Fernandes Jose Carlos bought 0 shares of DWSN on 12 April. They now own 0 DWSN shares.

Wilks Brothers, Llc bought 0 shares of DWSN on 18 January. They now own 15,547,359 DWSN shares.

Krylov Sergei bought 0 shares of DWSN on 18 January. They now own 0 DWSN shares.

Jumper Stephen C sold 245,316 shares of DWSN on 18 January. They now own 50,000 DWSN shares.

Wilks Matthew bought 0 shares of DWSN on 18 January. They now own 0 DWSN shares.

Vander Ploeg Mark A sold 36,792 shares of DWSN on 18 January. They now own 0 DWSN shares.

Cooper Craig W sold 93,070 shares of DWSN on 18 January. They now own 0 DWSN shares.

North Ted R sold 85,211 shares of DWSN on 18 January. They now own 0 DWSN shares.

Klofas Michael L sold 39,651 shares of DWSN on 18 January. They now own 0 DWSN shares.

Tobias C Ray sold 100,382 shares of DWSN on 18 January. They now own 25,000 DWSN shares.

Wilks Brothers, Llc sold 0 shares of DWSN on 18 January. They now own 2,094,237 DWSN shares.

Brata James Kevin sold 62,252 shares of DWSN on 18 January. They now own 25,000 DWSN shares.

Bradley Bruce Franklin bought 0 shares of DWSN on 18 January. They now own 0 DWSN shares.

Cooper Craig W bought 2,988 shares of DWSN on 30 September. They now own 93,070 DWSN shares.

Vander Ploeg Mark A bought 2,988 shares of DWSN on 30 September. They now own 31,099 DWSN shares.

North Ted R bought 2,988 shares of DWSN on 30 September. They now own 85,211 DWSN shares.

Klofas Michael L bought 2,988 shares of DWSN on 30 September. They now own 39,651 DWSN shares.

Brata James Kevin bought 25,000 shares of DWSN on 16 August. They now own 87,252 DWSN shares.

Tobias C Ray bought 25,000 shares of DWSN on 16 August. They now own 125,382 DWSN shares.

Jumper Stephen C bought 50,000 shares of DWSN on 16 August. They now own 295,316 DWSN shares.

Klofas Michael L bought 2,830 shares of DWSN on 30 June. They now own 36,663 DWSN shares.

Vander Ploeg Mark A bought 2,830 shares of DWSN on 30 June. They now own 28,111 DWSN shares.

North Ted R bought 2,830 shares of DWSN on 30 June. They now own 82,223 DWSN shares.

Cooper Craig W bought 2,830 shares of DWSN on 30 June. They now own 90,082 DWSN shares.

Brata James Kevin sold 4,620 shares of DWSN on 1 June. They now own 62,252 DWSN shares.

Tobias C Ray sold 4,620 shares of DWSN on 1 June. They now own 100,382 DWSN shares.

Tobias C Ray sold 2,448 shares of DWSN on 17 September. They now own 105,002 DWSN shares.

Tobias C Ray sold 13,639 shares of DWSN on 16 September. They now own 107,450 DWSN shares.

Tobias C Ray sold 516 shares of DWSN on 15 September. They now own 121,089 DWSN shares.

Thomas James W sold 4,165 shares of DWSN on 10 August. They now own 67,430 DWSN shares.

Tobias C Ray sold 3,465 shares of DWSN on 10 August. They now own 121,605 DWSN shares.

Brata James Kevin sold 3,465 shares of DWSN on 10 August. They now own 66,872 DWSN shares.

Jumper Stephen C bought 10,000 shares of DWSN on 10 March. They now own 245,316 DWSN shares.

Barrett William J bought 5,061 shares of DWSN on 31 December. They now own 786,510 DWSN shares.

Cooper Craig W bought 4,754 shares of DWSN on 31 December. They now own 87,252 DWSN shares.

Vander Ploeg Mark A bought 5,368 shares of DWSN on 31 December. They now own 25,281 DWSN shares.

Hoover Gary M bought 4,754 shares of DWSN on 31 December. They now own 84,371 DWSN shares.

Klofas Michael L bought 4,754 shares of DWSN on 31 December. They now own 33,833 DWSN shares.

North Ted R bought 5,214 shares of DWSN on 31 December. They now own 79,393 DWSN shares.

Vander Ploeg Mark A bought 6,408 shares of DWSN on 30 September. They now own 19,913 DWSN shares.

Cooper Craig W bought 5,715 shares of DWSN on 30 September. They now own 82,498 DWSN shares.

Barrett William J bought 6,062 shares of DWSN on 30 September. They now own 781,449 DWSN shares.

Klofas Michael L bought 5,715 shares of DWSN on 30 September. They now own 29,079 DWSN shares.

North Ted R bought 6,235 shares of DWSN on 30 September. They now own 74,179 DWSN shares.

Hoover Gary M bought 5,715 shares of DWSN on 30 September. They now own 79,617 DWSN shares.

Barrett William J bought 4,910 shares of DWSN on 28 June. They now own 775,387 DWSN shares.

Cooper Craig W bought 4,613 shares of DWSN on 28 June. They now own 76,783 DWSN shares.

North Ted R bought 5,059 shares of DWSN on 28 June. They now own 67,944 DWSN shares.

Klofas Michael L bought 4,613 shares of DWSN on 28 June. They now own 23,364 DWSN shares.

Vander Ploeg Mark A bought 5,208 shares of DWSN on 28 June. They now own 13,505 DWSN shares.

Hoover Gary M bought 4,613 shares of DWSN on 28 June. They now own 73,902 DWSN shares.

Whitener Wayne A sold 1,540 shares of DWSN on 30 May. They now own 43,669 DWSN shares.

Klofas Michael L bought 3,940 shares of DWSN on 29 March. They now own 18,751 DWSN shares.

Barrett William J bought 4,194 shares of DWSN on 29 March. They now own 770,477 DWSN shares.

Hoover Gary M bought 3,940 shares of DWSN on 29 March. They now own 69,289 DWSN shares.

Vander Ploeg Mark A bought 4,449 shares of DWSN on 29 March. They now own 8,297 DWSN shares.

North Ted R bought 4,322 shares of DWSN on 29 March. They now own 62,885 DWSN shares.

Cooper Craig W bought 3,940 shares of DWSN on 29 March. They now own 72,170 DWSN shares.

Thomas James W bought 6,089 shares of DWSN on 13 March. They now own 65,489 DWSN shares.

Thomas James W bought 6,106 shares of DWSN on 13 March. They now own 71,595 DWSN shares.

Thomas James W bought 805 shares of DWSN on 13 March. They now own 59,400 DWSN shares.

Thomas James W sold 6,095 shares of DWSN on 15 February. They now own 58,595 DWSN shares.

Tobias C Ray sold 6,930 shares of DWSN on 15 February. They now own 125,070 DWSN shares.

Jumper Stephen C sold 13,282 shares of DWSN on 15 February. They now own 235,316 DWSN shares.

Whitener Wayne A sold 7,623 shares of DWSN on 15 February. They now own 45,209 DWSN shares.

Brata James Kevin sold 4,966 shares of DWSN on 15 February. They now own 70,337 DWSN shares.

Vander Ploeg Mark A bought 0 shares of DWSN on 8 January. They now own 0 DWSN shares.

Cooper Craig W bought 3,409 shares of DWSN on 31 December. They now own 68,230 DWSN shares.

Klofas Michael L bought 3,409 shares of DWSN on 31 December. They now own 14,811 DWSN shares.

Barrett William J bought 3,629 shares of DWSN on 31 December. They now own 766,333 DWSN shares.

Hoover Gary M bought 3,409 shares of DWSN on 31 December. They now own 65,349 DWSN shares.

Vander Ploeg Mark A bought 3,848 shares of DWSN on 31 December. They now own 40,640 DWSN shares.

North Ted R bought 3,739 shares of DWSN on 31 December. They now own 58,563 DWSN shares.

North Ted R bought 2,170 shares of DWSN on 28 September. They now own 54,824 DWSN shares.

Klofas Michael L bought 1,989 shares of DWSN on 28 September. They now own 11,402 DWSN shares.

Hoover Gary M bought 1,989 shares of DWSN on 28 September. They now own 61,940 DWSN shares.

Barrett William J bought 1,989 shares of DWSN on 28 September. They now own 762,704 DWSN shares.

Vander Ploeg Mark A bought 2,230 shares of DWSN on 28 September. They now own 36,792 DWSN shares.

Cooper Craig W bought 1,868 shares of DWSN on 28 September. They now own 64,821 DWSN shares.

Barrett William J bought 10,000 shares of DWSN on 15 August. They now own 754,115 DWSN shares.

Barrett William J bought 6,600 shares of DWSN on 15 August. They now own 760,715 DWSN shares.

Barrett William J bought 3,230 shares of DWSN on 13 August. They now own 729,065 DWSN shares.

Barrett William J bought 15,000 shares of DWSN on 13 August. They now own 744,065 DWSN shares.

Barrett William J bought 15,000 shares of DWSN on 13 August. They now own 744,115 DWSN shares.

Barrett William J bought 3,280 shares of DWSN on 13 August. They now own 729,115 DWSN shares.

Whitener Wayne A sold 1,155 shares of DWSN on 10 August. They now own 52,832 DWSN shares.

Barrett William J bought 50 shares of DWSN on 8 August. They now own 725,835 DWSN shares.

Barrett William J bought 1,720 shares of DWSN on 6 August. They now own 725,785 DWSN shares.

Barrett William J bought 1,568 shares of DWSN on 29 June. They now own 724,066 DWSN shares.

Barrett William J bought 1,568 shares of DWSN on 29 June. They now own 724,066 DWSN shares.

Klofas Michael L bought 1,013 shares of DWSN on 29 June. They now own 9,413 DWSN shares.

Vander Ploeg Mark A bought 1,600 shares of DWSN on 29 June. They now own 34,562 DWSN shares.

Cooper Craig W bought 1,489 shares of DWSN on 29 June. They now own 62,953 DWSN shares.

Hoover Gary M bought 1,520 shares of DWSN on 29 June. They now own 59,951 DWSN shares.

North Ted R bought 1,615 shares of DWSN on 29 June. They now own 52,654 DWSN shares.

Whitener Wayne A bought 7,000 shares of DWSN on 30 May. They now own 53,987 DWSN shares.

Jumper Stephen C bought 36,000 shares of DWSN on 30 May. They now own 248,598 DWSN shares.

Thomas James W bought 15,000 shares of DWSN on 30 May. They now own 64,690 DWSN shares.

Mcinnes Allen T bought 5,000 shares of DWSN on 30 May. They now own 386,937 DWSN shares.

Tobias C Ray bought 21,000 shares of DWSN on 30 May. They now own 132,000 DWSN shares.

Brata James Kevin bought 21,000 shares of DWSN on 30 May. They now own 75,303 DWSN shares.

Klofas Michael L sold 0 shares of DWSN on 1 May. They now own 8,000 DWSN shares.

Vander Ploeg Mark A bought 1,788 shares of DWSN on 29 March. They now own 31,393 DWSN shares.

North Ted R bought 1,961 shares of DWSN on 29 March. They now own 48,609 DWSN shares.

Mcinnes Allen T bought 1,788 shares of DWSN on 29 March. They now own 363,750 DWSN shares.

Cooper Craig W bought 1,846 shares of DWSN on 29 March. They now own 58,538 DWSN shares.

Hoover Gary M bought 1,961 shares of DWSN on 29 March. They now own 55,649 DWSN shares.

Barrett William J bought 1,903 shares of DWSN on 29 March. They now own 688,094 DWSN shares.

North Ted R bought 2,542 shares of DWSN on 29 December. They now own 46,648 DWSN shares.

Hoover Gary M bought 2,542 shares of DWSN on 29 December. They now own 53,688 DWSN shares.

Barrett William J bought 2,467 shares of DWSN on 29 December. They now own 681,191 DWSN shares.

Vander Ploeg Mark A bought 2,318 shares of DWSN on 29 December. They now own 29,605 DWSN shares.

Cooper Craig W bought 2,392 shares of DWSN on 29 December. They now own 56,692 DWSN shares.

Mcinnes Allen T bought 2,318 shares of DWSN on 29 December. They now own 361,962 DWSN shares.

Barrett William J bought 195 shares of DWSN on 15 December. They now own 74,444 DWSN shares.

Barrett William J bought 5,000 shares of DWSN on 12 December. They now own 74,249 DWSN shares.

Barrett William J bought 5,000 shares of DWSN on 11 December. They now own 69,249 DWSN shares.

Thomas James W sold 3,048 shares of DWSN on 5 December. They now own 47,324 DWSN shares.

Tobias C Ray sold 3,479 shares of DWSN on 5 December. They now own 105,715 DWSN shares.

Jumper Stephen C sold 6,804 shares of DWSN on 5 December. They now own 202,475 DWSN shares.

Hoover Gary M bought 2,852 shares of DWSN on 30 September. They now own 51,146 DWSN shares.

Barrett William J bought 2,768 shares of DWSN on 30 September. They now own 678,724 DWSN shares.

Vander Ploeg Mark A bought 2,600 shares of DWSN on 30 September. They now own 27,287 DWSN shares.

Mcinnes Allen T bought 2,600 shares of DWSN on 30 September. They now own 359,644 DWSN shares.

North Ted R bought 2,852 shares of DWSN on 30 September. They now own 44,106 DWSN shares.

Cooper Craig W bought 2,684 shares of DWSN on 30 September. They now own 54,300 DWSN shares.

Brata James Kevin bought 15,000 shares of DWSN on 10 August. They now own 51,718 DWSN shares.

Thomas James W bought 15,000 shares of DWSN on 10 August. They now own 50,372 DWSN shares.

Jumper Stephen C bought 24,000 shares of DWSN on 10 August. They now own 209,279 DWSN shares.

Whitener Wayne A bought 5,000 shares of DWSN on 10 August. They now own 44,750 DWSN shares.

Tobias C Ray bought 15,000 shares of DWSN on 10 August. They now own 109,194 DWSN shares.

Hoover Gary M bought 3,231 shares of DWSN on 30 June. They now own 48,294 DWSN shares.

Mcinnes Allen T bought 2,946 shares of DWSN on 30 June. They now own 357,044 DWSN shares.

Vander Ploeg Mark A bought 2,946 shares of DWSN on 30 June. They now own 24,687 DWSN shares.

Cooper Craig W bought 3,041 shares of DWSN on 30 June. They now own 51,616 DWSN shares.

North Ted R bought 3,231 shares of DWSN on 30 June. They now own 41,254 DWSN shares.

Barrett William J bought 3,136 shares of DWSN on 30 June. They now own 675,956 DWSN shares.

Barrett William J bought 5,000 shares of DWSN on 30 May. They now own 672,820 DWSN shares.

Barrett William J bought 10,000 shares of DWSN on 30 May. They now own 677,820 DWSN shares.

Barrett William J bought 5,000 shares of DWSN on 18 May. They now own 667,820 DWSN shares.

Barrett William J bought 5,000 shares of DWSN on 17 May. They now own 662,820 DWSN shares.

Barrett William J bought 4,833 shares of DWSN on 15 May. They now own 657,820 DWSN shares.

Barrett William J bought 4,833 shares of DWSN on 15 May. They now own 657,280 DWSN shares.

Barrett William J bought 167 shares of DWSN on 12 May. They now own 652,987 DWSN shares.

Barrett William J bought 167 shares of DWSN on 12 May. They now own 652,987 DWSN shares.

North Ted R bought 2,272 shares of DWSN on 31 March. They now own 38,023 DWSN shares.

Mcinnes Allen T bought 2,072 shares of DWSN on 31 March. They now own 354,098 DWSN shares.

Cooper Craig W bought 2,139 shares of DWSN on 31 March. They now own 48,575 DWSN shares.

Vander Ploeg Mark A bought 2,072 shares of DWSN on 31 March. They now own 21,741 DWSN shares.

Hoover Gary M bought 2,272 shares of DWSN on 31 March. They now own 45,063 DWSN shares.

Barrett William J bought 2,205 shares of DWSN on 31 March. They now own 652,820 DWSN shares.

Winn Daniel G bought 1,875 shares of DWSN on 15 February. They now own 29,121 DWSN shares.

Cooper Craig W bought 1,476 shares of DWSN on 31 December. They now own 46,436 DWSN shares.

Hoover Gary M bought 1,568 shares of DWSN on 31 December. They now own 42,791 DWSN shares.

Mcinnes Allen T bought 1,429 shares of DWSN on 31 December. They now own 352,026 DWSN shares.

Barrett William J bought 7,947 shares of DWSN on 1 December. They now own 643,192 DWSN shares.