Mitchall G. Clark serves as Executive at Atara Biotherapeutics, Inc., where they oversee executive responsibilities. Since joining the company, Mitchall G. Clark has executed 44 insider transactions totaling $7.1M, demonstrating a bearish approach to their equity position. Their most recent transaction on May 18, 2018 involved selling 25,860 shares valued at $1.3M.
Mitchall G. Clark currently holds 107,972 shares of Atara Biotherapeutics, Inc. (ATRA), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Mitchall G. Clark has been a net seller of ATRA stock. They have purchased $0 and sold $7.1M worth of shares.
Mitchall G. Clark's most recent insider trade was on May 18, 2018, when they sold 25,860 shares at $50.03 per share.
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| $46.30 |
| Discretionary |
| May 16, 2018 | ATRA | $200.1K | Sale | 4,347 | $46.04 | Discretionary |
| May 15, 2018 | ATRA | $0 | Option Exercise | 4,808 | $N/A | Discretionary |
| Mar 29, 2018 | ATRA | $897.6K | Sale | 22,400 | $40.07 | Discretionary |
| Mar 27, 2018 | ATRA | $1.1M | Sale | 29,980 | $38.23 | Discretionary |
| Mar 27, 2018 | ATRA | $456.3K | Sale | 11,103 | $41.10 | Discretionary |
| Mar 27, 2018 | ATRA | $113.1K | Sale | 2,800 | $40.40 | Discretionary |
| Mar 27, 2018 | ATRA | $830.4K | Sale | 22,794 | $36.43 | Discretionary |
| Mar 27, 2018 | ATRA | $1.2M | Sale | 31,356 | $37.10 | Discretionary |
| Mar 27, 2018 | ATRA | $85.8K | Sale | 2,170 | $39.53 | Discretionary |
| Mar 27, 2018 | ATRA | $125.5K | Option Exercise | 11,406 | $11.00 | Discretionary |
| Mar 27, 2018 | ATRA | $725.5K | Option Exercise | 28,848 | $25.15 | Discretionary |
| Mar 27, 2018 | ATRA | $738.4K | Option Exercise | 32,500 | $22.72 | Discretionary |
| Feb 15, 2018 | ATRA | $169.6K | Payment | 3,604 | $47.05 | Discretionary |
| Feb 15, 2018 | ATRA | $0 | Option Exercise | 7,211 | $N/A | Discretionary |
| Feb 9, 2018 | ATRA | $154.5K | Payment | 3,704 | $41.70 | Discretionary |
| Feb 6, 2018 | ATRA | $158.8K | Payment | 4,437 | $35.80 | Discretionary |
| Feb 6, 2018 | ATRA | $0 | Award | 25,000 | $N/A | Discretionary |
| Nov 16, 2017 | ATRA | $46.7K | Sale | 3,290 | $14.20 | Discretionary |
| Nov 15, 2017 | ATRA | $0 | Option Exercise | 7,212 | $N/A | Discretionary |
| Aug 16, 2017 | ATRA | $43.3K | Sale | 3,021 | $14.33 | Discretionary |
| Aug 15, 2017 | ATRA | $0 | Option Exercise | 7,211 | $N/A | Discretionary |
| May 16, 2017 | ATRA | $59.1K | Sale | 3,873 | $15.25 | Discretionary |
| May 15, 2017 | ATRA | $0 | Option Exercise | 7,212 | $N/A | Discretionary |
| Feb 16, 2017 | ATRA | $48.8K | Sale | 3,059 | $15.96 | Discretionary |
| Feb 15, 2017 | ATRA | $0 | Option Exercise | 7,211 | $N/A | Discretionary |
| Nov 16, 2016 | ATRA | $58.5K | Sale | 2,995 | $19.53 | Discretionary |
| Nov 15, 2016 | ATRA | $0 | Option Exercise | 7,212 | $N/A | Discretionary |
| Aug 15, 2016 | ATRA | $0 | Option Exercise | 7,211 | $N/A | Discretionary |