ATRA
Atara Biotherapeutics, Inc.$10.62+0.16 (+1.53%)Prev Close$10.46·MCap$40.8M·P/E2.96·Vol84.9K·Yield—
▲
Buys (12M)
1
$4.74M
▼
Sells (12M)
8
$3.84M
◆
Net Activity
Net Buyer
$902.7K
●
Active Insiders
4
last 12 mo
Over the past 12 months, insider activity at Atara Biotherapeutics, Inc. (ATRA) has been mixed between buying and selling, with 1 insider purchase totaling $4.74M and 8 insider sales totaling $3.84M. The most recent insider transaction was by Grant-Huerta Yanina (officer: Chief Accounting Officer), who sold $22.0K worth of shares on May 20, 2026. Atara Biotherapeutics, Inc. operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $40.8M.
ATRA Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| May 20, 2026 | Grant-Huerta Yanina | officer: Chief Accounting Officer | Sell | 2,414 | $9.13 | $22.0K | 49,636 |
| May 20, 2026 | Nguyen AnhCo | director, officer: President and CEO | Sell | 5,241 | $9.13 | $47.8K | 137,837 |
| May 11, 2026 | EcoR1 Capital, LLC | 10 percent owner | Buy | 507,407 | $9.35 | $4.74M6.0% OS | 1,552,000+49% |
| May 11, 2026 | Panacea Innovation Ltd | 10 percent owner | Sell | 313,446 | $10.10 | $3.17M3.7% OS | 1,011,000 |
| Jan 14, 2026 | Panacea Innovation Ltd | 10 percent owner | Sell | 80,554 | $6.07 | $489.0K1.0% OS | 1,324,446 |
| Nov 17, 2025 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 1,804 | $13.19 | $23.8K | 0 |
| Nov 17, 2025 | Nguyen AnhCo | President and CEO | Sell | 2,915 | $13.19 | $38.4K | 0 |
| Aug 18, 2025 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 1,809 | $11.61 | $21.0K | 0 |
| Aug 18, 2025 | Nguyen AnhCo | President and CEO | Sell | 2,958 | $11.62 | $34.4K | 0 |
| May 16, 2025 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 2,218 | $6.76 | $15.0K | 0 |
| May 16, 2025 | Nguyen AnhCo | President and CEO | Sell | 3,276 | $6.76 | $22.2K | 0 |
| Mar 3, 2025 | Henrich Jill | EVP, Chief Regulatory Officer | Sell | 1,059 | $7.00 | $7.4K | 0 |
| Mar 3, 2025 | Hyllengren Eric J | EVP, CFO and COO | Sell | 1,211 | $7.00 | $8.5K | 0 |
| Mar 3, 2025 | Nguyen AnhCo | President and CEO | Sell | 3,331 | $7.00 | $23.3K | 0 |
| Nov 18, 2024 | Henrich Jill | EVP, Chief Regulatory Officer | Sell | 1,000 | $11.20 | $11.2K | 0 |
| Nov 18, 2024 | Hyllengren Eric J | EVP, CFO and COO | Sell | 1,364 | $11.20 | $15.3K | 0 |
| Nov 18, 2024 | Nguyen AnhCo | President and CEO | Sell | 1,664 | $11.20 | $18.6K | 0 |
| Aug 16, 2024 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 963 | $6.63 | $6.4K | 0 |
| Aug 16, 2024 | Hyllengren Eric J | EVP, CFO | Sell | 1,070 | $6.63 | $7.1K | 0 |
| Aug 16, 2024 | Murugan Amar | EVP, Chief Legal Officer | Sell | 1,158 | $6.63 | $7.7K | 0 |
| Aug 16, 2024 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 1,821 | $6.63 | $12.1K | 0 |
| Aug 16, 2024 | Touchon Pascal | President and CEO | Sell | 3,038 | $6.63 | $20.1K | 0 |
| May 16, 2024 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 25,750 | $0.62 | $15.9K | 0 |
| May 16, 2024 | Hyllengren Eric J | EVP, CFO | Sell | 28,648 | $0.62 | $17.7K | 0 |
| May 16, 2024 | Murugan Amar | EVP, Chief Legal Officer | Sell | 32,401 | $0.62 | $20.0K | 0 |
| May 16, 2024 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 42,899 | $0.62 | $26.5K0.5% OS | 0 |
| May 16, 2024 | Touchon Pascal | President and CEO | Sell | 81,506 | $0.62 | $50.3K1.0% OS | 0 |
| Mar 4, 2024 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 3,879 | $0.72 | $2.8K | 0 |
| Mar 4, 2024 | Hyllengren Eric J | EVP, CFO | Sell | 6,679 | $0.72 | $4.8K | 0 |
| Mar 4, 2024 | Murugan Amar | EVP, Chief Legal Officer | Sell | 10,044 | $0.72 | $7.2K | 0 |
| Mar 4, 2024 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 10,746 | $0.72 | $7.7K | 0 |
| Mar 4, 2024 | Touchon Pascal | President and CEO | Sell | 24,844 | $0.72 | $17.9K | 0 |
| Nov 16, 2023 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 3,267 | $0.39 | $1.3K | 0 |
| Nov 16, 2023 | Hyllengren Eric J | SVP, CFO | Sell | 11,958 | $0.39 | $4.7K | 0 |
| Nov 16, 2023 | Joshi Manher | EVP, Chief Medical Officer | Sell | 12,287 | $0.39 | $4.8K | 0 |
| Nov 16, 2023 | Murugan Amar | EVP, Chief Legal Officer | Sell | 8,307 | $0.39 | $3.2K | 0 |
| Nov 16, 2023 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 8,856 | $0.39 | $3.4K | 0 |
| Nov 16, 2023 | Touchon Pascal | President and CEO | Sell | 20,409 | $0.39 | $7.9K | 0 |
| Nov 13, 2023 | Gallagher Carol Giltner | Director | Buy | 270,000 | $0.25 | $68.2K3.3% OS | 0 |
| Nov 10, 2023 | DOBMEIER ERIC | Director | Buy | 446,825 | $0.23 | $101.3K5.5% OS | 0 |
| Nov 10, 2023 | HEIDEN WILLIAM K | Director | Buy | 100,000 | $0.25 | $25.3K1.2% OS | 0 |
| Aug 16, 2023 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 3,346 | $1.65 | $5.5K | 0 |
| Aug 16, 2023 | Hyllengren Eric J | SVP, CFO | Sell | 8,186 | $1.65 | $13.5K | 0 |
| Aug 16, 2023 | Joshi Manher | EVP, Chief Medical Officer | Sell | 6,975 | $1.65 | $11.5K | 0 |
| Aug 16, 2023 | Murugan Amar | EVP, Chief Legal Officer | Sell | 8,672 | $1.65 | $14.3K | 0 |
| Aug 16, 2023 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 15,126 | $1.65 | $25.0K | 0 |
| Aug 16, 2023 | Touchon Pascal | President and CEO | Sell | 30,766 | $1.65 | $50.8K | 0 |
| Jun 27, 2023 | Touchon Pascal | President and CEO | Sell | 14,291 | $1.66 | $23.7K | 0 |
| May 16, 2023 | Banard Charlene A. | EVP, Chief Technical Officer | Sell | 19,040 | $2.04 | $38.8K | 0 |
| May 16, 2023 | Hyllengren Eric J | SVP, CFO | Sell | 7,918 | $2.04 | $16.1K | 0 |
Showing 1–50 of 112
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ATRA Insider Buying Activity
The following table shows recent insider purchases of Atara Biotherapeutics, Inc. (ATRA) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| May 11, 2026 | EcoR1 Capital, LLC | 10 percent owner | Buy | 507,407 | $9.35 | $4.74M6.0% OS | 1,552,000+49% |
| Nov 13, 2023 | Gallagher Carol Giltner | Director | Buy | 270,000 | $0.25 | $68.2K3.3% OS | 0 |
| Nov 10, 2023 | DOBMEIER ERIC | Director | Buy | 446,825 | $0.23 | $101.3K5.5% OS | 0 |
| Nov 10, 2023 | HEIDEN WILLIAM K | Director | Buy | 100,000 | $0.25 | $25.3K1.2% OS | 0 |
ATRA Insider Selling Activity
The following table shows recent insider sales of Atara Biotherapeutics, Inc. (ATRA) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| May 20, 2026 | Grant-Huerta Yanina | officer: Chief Accounting Officer | Sell | 2,414 | $9.13 | $22.0K | 49,636 |
| May 20, 2026 | Nguyen AnhCo | director, officer: President and CEO | Sell | 5,241 | $9.13 | $47.8K | 137,837 |
| May 11, 2026 | Panacea Innovation Ltd | 10 percent owner | Sell | 313,446 | $10.10 | $3.17M3.7% OS | 1,011,000 |
| Jan 14, 2026 | Panacea Innovation Ltd | 10 percent owner | Sell | 80,554 | $6.07 | $489.0K1.0% OS | 1,324,446 |
| Nov 17, 2025 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 1,804 | $13.19 | $23.8K | 0 |
| Nov 17, 2025 | Nguyen AnhCo | President and CEO | Sell | 2,915 | $13.19 | $38.4K | 0 |
| Aug 18, 2025 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 1,809 | $11.61 | $21.0K | 0 |
| Aug 18, 2025 | Nguyen AnhCo | President and CEO | Sell | 2,958 | $11.62 | $34.4K | 0 |
| May 16, 2025 | Grant-Huerta Yanina | Chief Accounting Officer | Sell | 2,218 | $6.76 | $15.0K | 0 |
| May 16, 2025 | Nguyen AnhCo | President and CEO | Sell | 3,276 | $6.76 | $22.2K | 0 |
| Mar 3, 2025 | Henrich Jill | EVP, Chief Regulatory Officer | Sell | 1,059 | $7.00 | $7.4K | 0 |
| Mar 3, 2025 | Hyllengren Eric J | EVP, CFO and COO | Sell | 1,211 | $7.00 | $8.5K | 0 |
| Mar 3, 2025 | Nguyen AnhCo | President and CEO | Sell | 3,331 | $7.00 | $23.3K | 0 |
| Nov 18, 2024 | Henrich Jill | EVP, Chief Regulatory Officer | Sell | 1,000 | $11.20 | $11.2K | 0 |
| Nov 18, 2024 | Hyllengren Eric J | EVP, CFO and COO | Sell | 1,364 | $11.20 | $15.3K | 0 |
| Nov 18, 2024 | Nguyen AnhCo | President and CEO | Sell | 1,664 | $11.20 | $18.6K | 0 |
| Aug 16, 2024 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 963 | $6.63 | $6.4K | 0 |
| Aug 16, 2024 | Hyllengren Eric J | EVP, CFO | Sell | 1,070 | $6.63 | $7.1K | 0 |
| Aug 16, 2024 | Murugan Amar | EVP, Chief Legal Officer | Sell | 1,158 | $6.63 | $7.7K | 0 |
| Aug 16, 2024 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 1,821 | $6.63 | $12.1K | 0 |
| Aug 16, 2024 | Touchon Pascal | President and CEO | Sell | 3,038 | $6.63 | $20.1K | 0 |
| May 16, 2024 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 25,750 | $0.62 | $15.9K | 0 |
| May 16, 2024 | Hyllengren Eric J | EVP, CFO | Sell | 28,648 | $0.62 | $17.7K | 0 |
| May 16, 2024 | Murugan Amar | EVP, Chief Legal Officer | Sell | 32,401 | $0.62 | $20.0K | 0 |
| May 16, 2024 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 42,899 | $0.62 | $26.5K0.5% OS | 0 |
| May 16, 2024 | Touchon Pascal | President and CEO | Sell | 81,506 | $0.62 | $50.3K1.0% OS | 0 |
| Mar 4, 2024 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 3,879 | $0.72 | $2.8K | 0 |
| Mar 4, 2024 | Hyllengren Eric J | EVP, CFO | Sell | 6,679 | $0.72 | $4.8K | 0 |
| Mar 4, 2024 | Murugan Amar | EVP, Chief Legal Officer | Sell | 10,044 | $0.72 | $7.2K | 0 |
| Mar 4, 2024 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 10,746 | $0.72 | $7.7K | 0 |
| Mar 4, 2024 | Touchon Pascal | President and CEO | Sell | 24,844 | $0.72 | $17.9K | 0 |
| Nov 16, 2023 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 3,267 | $0.39 | $1.3K | 0 |
| Nov 16, 2023 | Hyllengren Eric J | SVP, CFO | Sell | 11,958 | $0.39 | $4.7K | 0 |
| Nov 16, 2023 | Joshi Manher | EVP, Chief Medical Officer | Sell | 12,287 | $0.39 | $4.8K | 0 |
| Nov 16, 2023 | Murugan Amar | EVP, Chief Legal Officer | Sell | 8,307 | $0.39 | $3.2K | 0 |
| Nov 16, 2023 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 8,856 | $0.39 | $3.4K | 0 |
| Nov 16, 2023 | Touchon Pascal | President and CEO | Sell | 20,409 | $0.39 | $7.9K | 0 |
| Aug 16, 2023 | Henrich Jill | EVP, Global Head RA & Quality | Sell | 3,346 | $1.65 | $5.5K | 0 |
| Aug 16, 2023 | Hyllengren Eric J | SVP, CFO | Sell | 8,186 | $1.65 | $13.5K | 0 |
| Aug 16, 2023 | Joshi Manher | EVP, Chief Medical Officer | Sell | 6,975 | $1.65 | $11.5K | 0 |
| Aug 16, 2023 | Murugan Amar | EVP, Chief Legal Officer | Sell | 8,672 | $1.65 | $14.3K | 0 |
| Aug 16, 2023 | Nguyen AnhCo | EVP, Chief Sci. & Tech Officer | Sell | 15,126 | $1.65 | $25.0K | 0 |
| Aug 16, 2023 | Touchon Pascal | President and CEO | Sell | 30,766 | $1.65 | $50.8K | 0 |
| Jun 27, 2023 | Touchon Pascal | President and CEO | Sell | 14,291 | $1.66 | $23.7K | 0 |
| May 16, 2023 | Banard Charlene A. | EVP, Chief Technical Officer | Sell | 19,040 | $2.04 | $38.8K | 0 |
| May 16, 2023 | Hyllengren Eric J | SVP, CFO | Sell | 7,918 | $2.04 | $16.1K | 0 |
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