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Buy ATRA
Atara Biotherapeutics Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be positive at 54.67. In total, the insiders bought 9.54M and sold 448.96K ATRA shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.
Insider Power
|
54.67 |
| ● Buy | 9.54M shares |
| ● Sell | 448.96K shares |
|
50% Buy Activity
Negligible or No Correlation
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Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
May 18, 2026 Sell |
Nguyen Anhco President And CEO |
5 241 Value: $47.8K |
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|
May 18, 2026 Sell |
Grant-huerta Yanina Chief Accounting Officer |
2 414 Value: $22.0K |
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|
May 07, 2026 Buy |
Ecor1 Capital, Llc 10 Percent Owner |
507 407 Value: $4.74M |
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May 07, 2026 Sell |
Panacea Innovation Ltd 10 Percent Owner |
313 446 Value: $3.17M |
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|
May 07, 2026 Buy |
Ecor1 Capital, Llc 10 Percent Owner |
0 Value: $0 |
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|
Mar 17, 2026 Buy |
Panacea Innovation Ltd 10 Percent Owner |
259 163 Value: $26 |
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Mar 17, 2026 Buy |
Panacea Innovation Ltd 10 Percent Owner |
259 163 Value: $26 |
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|
Mar 17, 2026 Sell |
Panacea Innovation Ltd 10 Percent Owner |
5 Value: $26 |
||
|
Mar 09, 2026 Buy |
Nguyen Anhco President And CEO |
81 100 Value: $541.7K |
||
|
Mar 09, 2026 Buy |
Grant-huerta Yanina Chief Accounting Officer |
20 300 Value: $135.6K |
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|
Mar 02, 2026 Sell |
Nguyen Anhco President And CEO |
1 298 Value: $7K |
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|
Mar 02, 2026 Sell |
Nguyen Anhco President And CEO |
58 Value: $295 |
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|
Mar 02, 2026 Sell |
Nguyen Anhco President And CEO |
198 Value: $1K |
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|
Mar 02, 2026 Sell |
Grant-huerta Yanina Chief Accounting Officer |
377 Value: $2K |
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Mar 02, 2026 Sell |
Grant-huerta Yanina Chief Accounting Officer |
24 Value: $122 |
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|
Mar 02, 2026 Sell |
Grant-huerta Yanina Chief Accounting Officer |
1 603 Value: $8K |
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Mar 02, 2026 Sell |
Grant-huerta Yanina Chief Accounting Officer |
100 Value: $508 |
||
|
Mar 02, 2026 Sell |
Nguyen Anhco President And CEO |
1 442 Value: $7K |
||
|
Jan 12, 2026 Sell |
Panacea Innovation Ltd 10 Percent Owner |
80 554 Value: $489.0K |
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|
Nov 28, 2025 Sell |
Panacea Innovation Ltd 10 Percent Owner |
1 Value: $14 |
||
|
Nov 28, 2025 Buy |
Panacea Innovation Ltd 10 Percent Owner |
48 737 Value: $5 |
||
|
Nov 28, 2025 Buy |
Panacea Innovation Ltd 10 Percent Owner |
48 737 Value: $5 |
||
|
Nov 17, 2025 Sell |
Nguyen Anhco President And CEO |
2 859 Value: $37.7K |
||
|
Nov 17, 2025 Sell |
Nguyen Anhco President And CEO |
56 Value: $739 |
||
|
Nov 17, 2025 Sell |
Grant-huerta Yanina Chief Accounting Officer |
1 645 Value: $21.7K |
About Insider Power
Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.
It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.
While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.
* October 6th, 2025 - Tested on 5562 stocks
