Insider Trading activities of Atara Biotherapeutics, Inc. insiders.

Monthly summaries of insider trading activities (stock purchases, sales, and option exercises) reported by insiders of Atara Biotherapeutics, Inc. since 2005 are illustrated in Table 1 and Table 2. Table 1 shows the monthly insider trading data of Atara Biotherapeutics, Inc. since year 2005. Table 2 shows the detailed insider transactions of Atara Biotherapeutics, Inc. since 2005. The reporting company's ticker symbol is ATRA. The reporting company's CIK number is 1604464.
The total value of stock buying since 2005 is $5,033,092.
The total value of stock sales since 2005 is $17,117,851.
The total value of stock option exercises since 2005 is $197,712.


Table 1. Monthly summaries of insider stock purchases, sales, and option exercises for Atara Biotherapeutics, Inc. (ATRA).
Trading Period Insider Buying Insider Sales Option Exercises
year-month Shares Value Shares Value Shares Value
2017-05 0 $0 34,135 $515,208 37,106 $0
2017-04 0 $0 20,400 $352,871 0 $0
2017-03 0 $0 93,300 $1,844,123 0 $0
2017-02 0 $0 77,183 $1,191,897 42,178 $0
2017-01 0 $0 20,400 $312,900 0 $0
2016-12 0 $0 18,000 $295,248 0 $0
2016-11 0 $0 48,049 $921,085 42,181 $0
2016-10 0 $0 14,600 $230,197 0 $0
2016-09 0 $0 19,200 $390,684 0 $0
2016-08 0 $0 16,302 $360,364 42,179 $0
2016-07 0 $0 19,200 $431,855 0 $0
2016-06 0 $0 21,600 $451,980 0 $0
2016-05 0 $0 24,964 $405,592 42,181 $0
2016-04 0 $0 15,400 $313,477 0 $0
2016-03 3,000 $41,565 300 $6,003 0 $0
2016-02 0 $0 20,255 $320,271 42,178 $0
2016-01 0 $0 2,400 $48,468 0 $0
2015-12 2,500 $55,000 8,800 $266,334 0 $0
2015-11 0 $0 23,723 $815,304 39,777 $0
2015-10 0 $0 7,200 $216,986 0 $0
2015-09 0 $0 10,400 $463,737 0 $0
2015-08 0 $0 71,383 $3,280,083 105,275 $197,712
2015-07 0 $0 20,500 $1,162,808 0 $0
2015-06 0 $0 34,200 $1,650,240 0 $0
2015-05 0 $0 14,000 $551,090 242,254 $0
2015-04 0 $0 5,200 $319,046 0 $0
2015-03 4,000 $118,285 0 $0 0 $0
2015-02 11,000 $198,000 0 $0 0 $0
2014-10 420,022 $4,620,242 0 $0 0 $0

Table 2. Detailed insider stock purchases, sales, and option exercises of Atara Biotherapeutics, Inc. insiders (ATRA)
  Trade Date   Insider Name Trade Type     Shares       Price ($)   Value ($)
2017-05-18 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 14.94 35,856
2017-05-17 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 14.88 35,712
2017-05-16 Clark Mitchall G. (EVP & Chief R & QA Officer) Sale 3,873 15.25 59,063
2017-05-16 Soffer Gad (EVP & Chief Strategy Officer) Sale 5,674 15.19 86,188
2017-05-16 Gallagher Carol Giltner (Director) Sale 1,184 15.25 18,056
2017-05-16 Mcgrath John (EVP & Chief Financial Officer) Sale 2,000 15.27 30,540
2017-05-15 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,908 .00 0
2017-05-15 Haqq Christopher (EVP, R&D & Chief Scientific Of) Sale 7,604 14.99 113,983
2017-05-15 Haqq Christopher (EVP, R&D & Chief Scientific Of) Option Ex 829 .00 0
2017-05-15 Clark Mitchall G. (EVP & Chief R & QA Officer) Option Ex 7,212 .00 0
2017-05-15 Soffer Gad (EVP & Chief Strategy Officer) Sale 7,000 15.13 105,910
2017-05-15 Soffer Gad (EVP & Chief Strategy Officer) Option Ex 10,556 .00 0
2017-05-15 Fust Matthew K (Director) Option Ex 1,602 .00 0
2017-05-15 Gallagher Carol Giltner (Director) Option Ex 2,366 .00 0
2017-05-15 Mcgrath John (EVP & Chief Financial Officer) Sale 2,000 14.95 29,900
2017-05-15 Mcgrath John (EVP & Chief Financial Officer) Option Ex 8,633 .00 0
2017-04-26 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 17.78 64,008
2017-04-25 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 17.39 62,586
2017-04-17 Haqq Christopher (EVP, R&D & Chief Scientific Of) Sale 6,000 17.28 103,680
2017-04-11 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,200 16.99 71,358
2017-04-10 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,000 17.08 51,239
2017-03-28 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 19.43 69,930
2017-03-27 Ciechanover Isaac E. (Chief Executive Officer) Sale 12,400 20.34 252,216
2017-03-23 Mcgrath John (EVP & Chief Financial Officer) Sale 6,500 21.08 137,020
2017-03-22 Mcgrath John (EVP & Chief Financial Officer) Sale 7,500 20.27 152,025
2017-03-17 Ciechanover Isaac E. (Chief Executive Officer) Sale 20,000 19.25 385,100
2017-03-16 Ciechanover Isaac E. (Chief Executive Officer) Sale 10,800 18.54 200,232
2017-03-15 Haqq Christopher (EVP, R&D & Chief Scientific Of) Sale 6,000 19.60 117,600
2017-03-10 Soffer Gad (EVP & Chief Strategy Officer) Sale 2,500 20.00 50,000
2017-03-10 Mcgrath John (EVP & Chief Financial Officer) Sale 24,000 20.00 480,000
2017-02-21 Mcgrath John (EVP & Chief Financial Officer) Sale 9,000 15.14 136,260
2017-02-16 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 15.57 37,368
2017-02-16 Clark Mitchall G. (EVP & Chief R & QA Officer) Sale 3,059 15.96 48,821
2017-02-16 Soffer Gad (EVP & Chief Strategy Officer) Sale 7,273 15.62 113,604
2017-02-16 Gallagher Carol Giltner (Director) Sale 1,183 16.10 19,046
2017-02-15 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 15.54 37,296
2017-02-15 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,907 .00 0
2017-02-15 Haqq Christopher (EVP, R&D & Chief Scientific Of) Sale 7,604 15.49 117,785
2017-02-15 Haqq Christopher (EVP, R&D & Chief Scientific Of) Option Ex 829 .00 0
2017-02-15 Clark Mitchall G. (EVP & Chief R & QA Officer) Option Ex 7,211 .00 0
2017-02-15 Soffer Gad (EVP & Chief Strategy Officer) Option Ex 13,762 .00 0
2017-02-15 Fust Matthew K (Director) Option Ex 1,603 .00 0
2017-02-15 Gallagher Carol Giltner (Director) Option Ex 2,365 .00 0
2017-02-15 Mcgrath John (EVP & Chief Financial Officer) Option Ex 10,501 .00 0
2017-02-14 Soffer Gad (EVP & Chief Strategy Officer) Sale 7,000 15.22 106,540
2017-02-10 Soffer Gad (EVP & Chief Strategy Officer) Sale 6,274 15.78 98,972
2017-02-09 Haqq Christopher (EVP, R&D & Chief Scientific Of) Sale 13,975 15.46 216,053
2017-02-09 Turner Heather D (EVP, General Counsel & Sec.) Sale 12,215 15.93 194,584
2017-02-03 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 13.87 33,288
2017-02-02 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 13.45 32,280
2017-01-18 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 14.47 34,728
2017-01-17 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 14.08 50,688
2017-01-17 Haqq Christopher (EVP, R&D & Chief Scientific Of) Sale 6,000 14.27 85,620
2017-01-06 Ciechanover Isaac E. (Chief Executive Officer) Sale 6,000 17.10 102,600
2017-01-05 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 16.36 39,264
2016-12-23 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 15.25 36,600
2016-12-22 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 15.49 37,188
2016-12-15 Haqq Christopher (Chief Medical Officer) Sale 6,000 15.40 92,400
2016-12-07 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 17.30 62,280
2016-12-06 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 18.55 66,780
2016-11-23 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 18.81 67,716
2016-11-22 Ciechanover Isaac E. (Chief Executive Officer) Sale 8,400 18.21 152,964
2016-11-21 Haqq Christopher (Chief Medical Officer) Sale 7,068 17.85 126,163
2016-11-17 Soffer Gad (Chief Operating Officer) Sale 1,480 18.41 27,246
2016-11-16 Clark Mitchall G. (Chief R & QA Officer) Sale 2,995 19.53 58,492
2016-11-16 Soffer Gad (Chief Operating Officer) Sale 7,136 19.27 137,510
2016-11-16 Gallagher Carol Giltner (Director) Sale 1,184 19.35 22,910
2016-11-15 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,908 .00 0
2016-11-15 Haqq Christopher (Chief Medical Officer) Sale 1,604 19.95 31,999
2016-11-15 Haqq Christopher (Chief Medical Officer) Option Ex 829 .00 0
2016-11-15 Clark Mitchall G. (Chief R & QA Officer) Option Ex 7,212 .00 0
2016-11-15 Soffer Gad (Chief Operating Officer) Option Ex 13,761 .00 0
2016-11-15 Fust Matthew K (Director) Option Ex 1,602 .00 0
2016-11-15 Gallagher Carol Giltner (Director) Option Ex 2,366 .00 0
2016-11-15 Mcgrath John (Chief Financial Officer) Option Ex 10,503 .00 0
2016-11-14 Soffer Gad (Chief Operating Officer) Sale 9,582 20.55 196,910
2016-11-11 Mcgrath John (Chief Financial Officer) Sale 2,500 19.37 48,425
2016-11-10 Mcgrath John (Chief Financial Officer) Sale 2,500 20.30 50,750
2016-10-27 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 13.70 32,880
2016-10-26 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 13.91 33,384
2016-10-14 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 16.01 38,424
2016-10-13 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,400 15.91 38,184
2016-10-12 Mcgrath John (Chief Financial Officer) Sale 2,500 16.41 41,025
2016-10-11 Mcgrath John (Chief Financial Officer) Sale 2,500 18.52 46,300
2016-09-28 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 21.61 103,728
2016-09-27 Ciechanover Isaac E. (Chief Executive Officer) Sale 7,200 20.50 147,600
2016-09-16 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 19.32 69,552
2016-09-15 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 19.39 69,804
2016-08-23 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 22.08 105,983
2016-08-22 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 22.58 108,383
2016-08-16 Soffer Gad (Chief Operating Officer) Sale 5,356 21.70 116,198
2016-08-15 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,908 .00 0
2016-08-15 Haqq Christopher (Chief Medical Officer) Sale 1,346 22.14 29,800
2016-08-15 Haqq Christopher (Chief Medical Officer) Option Ex 829 .00 0
2016-08-15 Clark Mitchall G. (Chief R & QA Officer) Option Ex 7,211 .00 0
2016-08-15 Soffer Gad (Chief Operating Officer) Option Ex 13,761 .00 0
2016-08-15 Fust Matthew K (Director) Option Ex 1,603 .00 0
2016-08-15 Gallagher Carol Giltner (Director) Option Ex 2,366 .00 0
2016-08-15 Mcgrath John (Chief Financial Officer) Option Ex 10,501 .00 0
2016-07-21 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 22.22 106,656
2016-07-20 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 21.99 105,551
2016-07-08 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 22.96 110,208
2016-07-07 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 22.80 109,440
2016-06-24 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 21.32 102,336
2016-06-23 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 21.19 101,712
2016-06-08 Ciechanover Isaac E. (Chief Executive Officer) Sale 4,800 20.79 99,792
2016-06-07 Ciechanover Isaac E. (Chief Executive Officer) Sale 7,200 20.57 148,140
2016-05-26 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 17.35 62,460
2016-05-25 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,600 18.03 64,908
2016-05-18 Gallagher Carol Giltner (Director) Sale 1,184 15.96 18,896
2016-05-17 Soffer Gad (Chief Operating Officer) Sale 5,427 15.91 86,343
2016-05-16 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,907 .00 0
2016-05-16 Haqq Christopher (Chief Medical Officer) Sale 1,605 15.57 24,989
2016-05-16 Haqq Christopher (Chief Medical Officer) Option Ex 830 .00 0
2016-05-16 Clark Mitchall G. (Chief R & QA Officer) Sale 4,153 15.15 62,917
2016-05-16 Clark Mitchall G. (Chief R & QA Officer) Option Ex 7,212 .00 0
2016-05-16 Soffer Gad (Chief Operating Officer) Option Ex 13,761 .00 0
2016-05-16 Fust Matthew K (Director) Option Ex 1,602 .00 0
2016-05-16 Gallagher Carol Giltner (Director) Option Ex 2,366 .00 0
2016-05-16 Mcgrath John (Chief Financial Officer) Sale 5,395 15.77 85,079
2016-05-16 Mcgrath John (Chief Financial Officer) Option Ex 10,503 .00 0
2016-04-26 Ciechanover Isaac E. (Chief Executive Officer) Sale 100 20.15 2,014
2016-04-25 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 20.12 24,144
2016-04-12 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 20.20 24,240
2016-04-11 Ciechanover Isaac E. (Chief Executive Officer) Sale 12,010 20.42 245,244
2016-04-01 Ciechanover Isaac E. (Chief Executive Officer) Sale 890 20.04 17,835
2016-03-31 Ciechanover Isaac E. (Chief Executive Officer) Sale 300 20.01 6,003
2016-03-17 Dobmeier Eric (Director) Buy 3,000 13.86 41,565
2016-02-17 Soffer Gad (Chief Operating Officer) Sale 5,711 16.60 94,802
2016-02-17 Gallagher Carol Giltner (Director) Sale 1,183 16.30 19,282
2016-02-16 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,908 .00 0
2016-02-16 Haqq Christopher (Chief Medical Officer) Sale 3,208 15.43 49,499
2016-02-16 Haqq Christopher (Chief Medical Officer) Option Ex 829 .00 0
2016-02-16 Clark Mitchall G. (Chief R & QA Officer) Sale 4,153 15.35 63,748
2016-02-16 Clark Mitchall G. (Chief R & QA Officer) Option Ex 7,211 .00 0
2016-02-16 Soffer Gad (Chief Operating Officer) Option Ex 13,761 .00 0
2016-02-16 Fust Matthew K (Director) Option Ex 1,603 .00 0
2016-02-16 Gallagher Carol Giltner (Director) Option Ex 2,365 .00 0
2016-02-16 Mcgrath John (Chief Financial Officer) Sale 6,000 15.49 92,940
2016-02-16 Mcgrath John (Chief Financial Officer) Option Ex 10,501 .00 0
2016-01-14 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 20.07 24,084
2016-01-13 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 20.32 24,384
2015-12-31 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 26.59 31,902
2015-12-30 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 25.21 30,252
2015-12-16 Dobmeier Eric (Director) Buy 2,500 22.00 55,000
2015-12-15 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 21.48 25,779
2015-12-14 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 23.91 28,695
2015-12-04 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 37.46 74,920
2015-12-03 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 37.39 74,786
2015-11-30 Mcgrath John (Chief Financial Officer) Sale 6,000 40.00 240,000
2015-11-24 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 35.77 71,546
2015-11-23 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,800 34.74 97,272
2015-11-17 Soffer Gad (Chief Operating Officer) Sale 7,586 31.39 238,139
2015-11-17 Gallagher Carol Giltner (Director) Sale 1,184 31.10 36,822
2015-11-16 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,908 .00 0
2015-11-16 Haqq Christopher (Chief Medical Officer) Option Ex 829 .00 0
2015-11-16 Clark Mitchall G. (Chief R & QA Officer) Sale 4,153 31.67 131,525
2015-11-16 Clark Mitchall G. (Chief R & QA Officer) Option Ex 4,808 .00 0
2015-11-16 Soffer Gad (Chief Operating Officer) Option Ex 13,762 .00 0
2015-11-16 Fust Matthew K (Director) Option Ex 1,602 .00 0
2015-11-16 Gallagher Carol Giltner (Director) Option Ex 2,366 .00 0
2015-11-16 Mcgrath John (Chief Financial Officer) Option Ex 10,502 .00 0
2015-10-22 Ciechanover Isaac E. (Chief Executive Officer) Sale 1,200 24.86 29,832
2015-10-21 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 27.12 54,234
2015-10-07 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 34.99 69,980
2015-10-06 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 31.47 62,940
2015-09-24 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 42.62 110,799
2015-09-23 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 43.29 112,554
2015-09-11 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 46.66 121,323
2015-09-10 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 45.79 119,061
2015-08-31 Haqq Christopher (Chief Medical Officer) Sale 5,000 41.85 209,274
2015-08-28 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 39.63 103,051
2015-08-27 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 39.34 102,291
2015-08-24 Gallagher Carol Giltner (Director) Sale 5,874 40.19 236,076
2015-08-21 Gallagher Carol Giltner (Director) Sale 5,874 42.05 247,031
2015-08-20 Gallagher Carol Giltner (Director) Sale 5,874 44.40 260,805
2015-08-19 Gallagher Carol Giltner (Director) Sale 5,875 48.38 284,232
2015-08-18 Soffer Gad (Chief Operating Officer) Sale 7,711 49.52 381,848
2015-08-18 Gallagher Carol Giltner (Director) Sale 5,764 49.38 284,626
2015-08-18 Mcgrath John (Chief Financial Officer) Sale 6,000 49.38 296,280
2015-08-17 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 5,907 .00 0
2015-08-17 Haqq Christopher (Chief Medical Officer) Sale 1,604 46.16 74,048
2015-08-17 Haqq Christopher (Chief Medical Officer) Option Ex 829 .00 0
2015-08-17 Clark Mitchall G. (Chief R & QA Officer) Sale 7,829 46.19 361,621
2015-08-17 Clark Mitchall G. (Chief R & QA Officer) Option Ex 11,375 12.05 137,068
2015-08-17 Soffer Gad (Chief Operating Officer) Sale 8,778 50.00 438,900
2015-08-17 Soffer Gad (Chief Operating Officer) Option Ex 16,538 3.67 60,644
2015-08-17 Fust Matthew K (Director) Option Ex 1,603 .00 0
2015-08-17 Gallagher Carol Giltner (Director) Option Ex 58,521 .00 0
2015-08-17 Mcgrath John (Chief Financial Officer) Option Ex 10,502 .00 0
2015-07-31 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 56.37 146,562
2015-07-31 Haqq Christopher (Chief Medical Officer) Sale 2,500 55.43 138,575
2015-07-30 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 56.59 147,134
2015-07-17 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 60.30 156,793
2015-07-16 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 61.83 160,765
2015-07-15 Haqq Christopher (Chief Medical Officer) Sale 2,500 63.06 157,650
2015-07-01 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 48.54 126,204
2015-07-01 Haqq Christopher (Chief Medical Officer) Sale 2,500 51.65 129,125
2015-06-30 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 52.76 137,183
2015-06-18 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 54.84 142,591
2015-06-17 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 55.23 143,598
2015-06-15 Haqq Christopher (Chief Medical Officer) Sale 7,500 46.08 345,600
2015-06-15 Mcgrath John (Chief Financial Officer) Sale 10,000 50.00 500,000
2015-06-05 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 44.54 115,811
2015-06-04 Ciechanover Isaac E. (Chief Executive Officer) Sale 3,800 42.38 161,032
2015-06-01 Haqq Christopher (Chief Medical Officer) Sale 2,500 41.77 104,425
2015-05-29 Mcgrath John (Chief Financial Officer) Sale 10,000 40.00 400,000
2015-05-22 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 37.78 75,560
2015-05-21 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,000 37.77 75,530
2015-05-15 Ciechanover Isaac E. (Chief Executive Officer) Option Ex 31,508 .00 0
2015-05-15 Haqq Christopher (Chief Medical Officer) Option Ex 4,422 .00 0
2015-05-15 Clark Mitchall G. (Chief R & QA Officer) Option Ex 31,250 .00 0
2015-05-15 Soffer Gad (Chief Operating Officer) Option Ex 102,239 .00 0
2015-05-15 Fust Matthew K (Director) Option Ex 7,478 .00 0
2015-05-15 Mcgrath John (Chief Financial Officer) Option Ex 65,357 .00 0
2015-04-23 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 62.70 163,020
2015-04-22 Ciechanover Isaac E. (Chief Executive Officer) Sale 2,600 60.01 156,026
2015-03-10 Marcus Joel S (Director) Buy 1,500 29.99 44,985
2015-03-09 Marcus Joel S (Director) Buy 2,500 29.32 73,300
2015-02-18 Gallagher Carol Giltner (Director) Buy 11,000 18.00 198,000
2014-10-21 Halak Brian K (10% Owner) Buy 250,000 11.00 2,750,000
2014-10-21 Gallagher Carol Giltner (Director) Buy 18,181 11.00 199,991
2014-10-21 Marcus Joel S (Director) Buy 150,000 11.00 1,650,000

Insider trading activities including stock purchases, stock sales, and option exercises of ATRA listed in the above tables cannot be completely guaranteed as to their accuracy. For more insider trading information of Atara Biotherapeutics, Inc. (symbol ATRA, CIK number 1604464) see the Securities and Exchange Commission (SEC) website.