Atara Biotherapeutics, Inc. (ATRA)

Latest Insider Confidence Score

2026Q1

49.2
Bearish

Company insider confidence (by quarter)

2015Q1 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Seidenberg Beth C — 1,877,044 Jun 2, 2023
Panacea Innovation Ltd 10% Owner 1,405,000 Dec 1, 2025
Huang James Director 1,405,000 Dec 1, 2025
Dobmeier Eric Director 563,325 Nov 14, 2023
Redmile Group, LLC — 441,701 May 23, 2025

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Mar 2, 2026 Mar 4, 2026 Grant-Huerta Yanina Chief Accounting Officer Sell 46.3 -2,104 -6.21% ✗ $10.7K
Mar 2, 2026 Mar 4, 2026 Nguyen AnhCo CEO Sell 46.3 -2,996 -4.61% ✗ $15.2K
Jan 12, 2026 Jan 14, 2026 Panacea Innovation Ltd 10% Owner Sell 20.0 -80,554 -5.73% ✗ $489K
Nov 28, 2025 Dec 1, 2025 Panacea Innovation Ltd 10% Owner Sell 52.5 -1 0.00% ✗ $14
Nov 17, 2025 Nov 19, 2025 Nguyen AnhCo CEO Sell 46.3 -2,915 -4.29% ✗ $38.4K
Nov 17, 2025 Nov 19, 2025 Grant-Huerta Yanina Chief Accounting Officer Sell 46.3 -1,804 -5.12% ✗ $23.8K
Aug 18, 2025 Aug 20, 2025 Nguyen AnhCo CEO Sell 46.3 -2,958 -4.18% ✗ $34.4K
Aug 18, 2025 Aug 20, 2025 Grant-Huerta Yanina Chief Accounting Officer Sell 46.3 -1,809 -4.88% ✗ $21K
Aug 15, 2025 Aug 19, 2025 Panacea Innovation Ltd 10% Owner Buy 90.0 +55,000 4.07% ✗ $670.4K
Jul 17, 2025 Jul 21, 2025 Panacea Innovation Ltd 10% Owner Buy 82.5 +19,335 1.45% ✗ $186.4K
Jun 10, 2025 Jun 12, 2025 Gallagher Carol Giltner Director Neutral 90.0 +7,828 31.08% ✗ -
Jun 10, 2025 Jun 12, 2025 Fust Matthew K Director Neutral 90.0 +7,828 75.56% ✗ -
Jun 10, 2025 Jun 12, 2025 Touchon Pascal Director Neutral 90.0 +7,828 11.16% ✗ -
Jun 10, 2025 Jun 12, 2025 Roncarolo Maria Grazia Director Neutral 90.0 +7,828 82.05% ✗ -
Jun 10, 2025 Jun 12, 2025 MALLIK AMEET Director Neutral 90.0 +7,828 86.02% ✗ -
Jun 10, 2025 Jun 12, 2025 HEIDEN WILLIAM K Director Neutral 90.0 +7,828 54.51% ✗ -
May 23, 2025 Subramanian Nachiappan Director Neutral 52.5 - 0.00% ✗ -
May 23, 2025 Redmile Group, LLC Director Neutral 52.5 - 0.00% ✗ -
May 21, 2025 Panacea Innovation Ltd 10% Owner Neutral 52.5 - 0.00% ✗ -
May 16, 2025 May 20, 2025 Grant-Huerta Yanina Chief Accounting Officer Sell 46.3 -2,218 -5.65% ✗ $15K
May 16, 2025 May 20, 2025 Nguyen AnhCo CEO Sell 46.3 -3,276 -4.42% ✗ $22.2K
May 16, 2025 May 16, 2025 Adiumentum Capital Fund I LP Director Neutral 85.0 +75,572 6.67% ✗ -
Apr 10, 2025 Grant-Huerta Yanina Chief Accounting Officer Neutral 52.5 - 0.00% ✗ -
Mar 31, 2025 Apr 2, 2025 Hyllengren Eric J Other Neutral 52.5 - 0.00% ✗ -
Mar 3, 2025 Mar 5, 2025 Nguyen AnhCo CEO Sell 46.3 -3,331 -4.30% ✗ $23.3K
Mar 3, 2025 Mar 5, 2025 Hyllengren Eric J CFO Sell 47.5 -1,211 -2.11% ✗ $8.5K
Mar 3, 2025 Mar 5, 2025 Henrich Jill EVP, Chief Regulatory Officer Sell 47.5 -1,059 -5.37% ✗ $7.4K
Jan 27, 2025 Jan 29, 2025 Hyllengren Eric J CFO Neutral 90.0 +34,050 145.56% ✗ -
Nov 18, 2024 Nov 20, 2024 Henrich Jill EVP, Chief Regulatory Officer Sell 46.3 -1,000 -4.91% ✗ $11.2K
Nov 18, 2024 Nov 20, 2024 Hyllengren Eric J CFO Sell 46.3 -1,364 -5.51% ✗ $15.3K
Nov 18, 2024 Nov 20, 2024 Nguyen AnhCo CEO Sell 46.3 -1,664 -2.10% ✗ $18.6K
Sep 9, 2024 Sep 11, 2024 Nguyen AnhCo CEO Neutral 90.0 +45,000 131.90% ✗ -
Sep 5, 2024 Adiumentum Capital Fund I LP Director Neutral 52.5 - 0.00% ✗ -
Aug 16, 2024 Aug 20, 2024 Touchon Pascal CEO Sell 46.3 -3,038 -4.15% ✗ $20.1K
Aug 16, 2024 Aug 20, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer Sell 46.3 -1,821 -5.07% ✗ $12.1K
Aug 16, 2024 Aug 20, 2024 Murugan Amar EVP, Chief Legal Officer Sell 47.5 -1,158 -4.14% ✗ $7.7K
Aug 16, 2024 Aug 20, 2024 Hyllengren Eric J CFO Sell 47.5 -1,070 -4.14% ✗ $7.1K
Aug 16, 2024 Aug 20, 2024 Henrich Jill EVP, Global Head RA & Quality Sell 47.5 -963 -4.51% ✗ $6.4K
Aug 12, 2024 Aug 14, 2024 Touchon Pascal CEO Neutral 52.5 - 0.00% ✗ -
May 16, 2024 May 20, 2024 Touchon Pascal CEO Sell 42.5 -81,506 -4.27% ✗ $50.3K
May 16, 2024 May 20, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer Sell 46.3 -42,899 -4.56% ✗ $26.5K
May 16, 2024 May 20, 2024 Murugan Amar EVP, Chief Legal Officer Sell 46.3 -32,401 -4.45% ✗ $20K
May 16, 2024 May 20, 2024 Hyllengren Eric J CFO Sell 46.3 -28,648 -4.25% ✗ $17.7K
May 16, 2024 May 20, 2024 Henrich Jill EVP, Global Head RA & Quality Sell 46.3 -25,750 -4.64% ✗ $15.9K
Mar 31, 2024 Apr 2, 2024 Fust Matthew K Director Neutral 90.0 +150,000 137.61% ✗ -
Mar 31, 2024 Apr 2, 2024 HEIDEN WILLIAM K Director Neutral 90.0 +150,000 71.77% ✗ -
Mar 31, 2024 Apr 2, 2024 Roncarolo Maria Grazia Director Neutral 90.0 +150,000 169.49% ✗ -
Mar 31, 2024 Apr 2, 2024 Gallagher Carol Giltner Director Neutral 90.0 +150,000 31.28% ✗ -
Mar 31, 2024 Apr 2, 2024 MALLIK AMEET Director Neutral 90.0 +150,000 193.55% ✗ -
Mar 4, 2024 Mar 6, 2024 Touchon Pascal CEO Sell 46.3 -24,844 -1.28% ✗ $17.9K
Mar 4, 2024 Mar 6, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer Sell 47.5 -10,746 -1.13% ✗ $7.7K
Mar 4, 2024 Mar 6, 2024 Murugan Amar EVP, Chief Legal Officer Sell 47.5 -10,044 -1.36% ✗ $7.2K
Mar 4, 2024 Mar 6, 2024 Hyllengren Eric J CFO Sell 50.0 -6,679 -0.98% ✗ $4.8K
Mar 4, 2024 Mar 6, 2024 Henrich Jill EVP, Global Head RA & Quality Sell 50.0 -3,879 -0.69% ✗ $2.8K
Jan 8, 2024 Jan 9, 2024 Touchon Pascal CEO Neutral 90.0 +1,280,000 195.27% ✗ -
Jan 8, 2024 Jan 9, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer Neutral 90.0 +675,000 243.56% ✗ -
Jan 8, 2024 Jan 9, 2024 Murugan Amar EVP, Chief Legal Officer Neutral 90.0 +475,000 180.91% ✗ -
Jan 8, 2024 Jan 9, 2024 Hyllengren Eric J CFO Neutral 90.0 +475,000 230.58% ✗ -
Jan 8, 2024 Jan 9, 2024 Henrich Jill EVP, Global Head RA & Quality Neutral 90.0 +450,000 413.30% ✗ -
Nov 16, 2023 Nov 20, 2023 Touchon Pascal CEO Sell 47.5 -20,409 -3.02% ✗ $7.9K
Nov 16, 2023 Nov 20, 2023 Nguyen AnhCo EVP, Chief Sci. & Tech Officer Sell 47.5 -8,856 -3.10% ✗ $3.4K
Nov 16, 2023 Nov 20, 2023 Murugan Amar EVP, Chief Legal Officer Sell 47.5 -8,307 -3.13% ✗ $3.2K
Nov 16, 2023 Nov 20, 2023 Joshi Manher EVP, Chief Medical Officer Sell 47.5 -12,287 -6.69% ✗ $4.8K
Nov 16, 2023 Nov 20, 2023 Hyllengren Eric J CFO Sell 47.5 -11,958 -5.49% ✗ $4.7K
Nov 16, 2023 Nov 20, 2023 Henrich Jill EVP, Global Head RA & Quality Sell 47.5 -3,267 -3.03% ✗ $1.3K
Nov 13, 2023 Nov 15, 2023 Gallagher Carol Giltner Director Buy 95.0 +270,000 142.54% ✗ $68.2K
Nov 10, 2023 Nov 14, 2023 HEIDEN WILLIAM K Director Buy 91.3 +100,000 91.74% ✗ $25.3K
Nov 10, 2023 Nov 14, 2023 DOBMEIER ERIC Director Buy 95.0 +446,825 383.54% ✗ $101.3K
Aug 16, 2023 Aug 18, 2023 Hyllengren Eric J CFO Sell 46.3 -8,186 -3.62% ✗ $13.5K
Aug 16, 2023 Aug 18, 2023 Murugan Amar EVP, Chief Legal Officer Sell 46.3 -8,672 -3.16% ✗ $14.3K
Aug 16, 2023 Aug 18, 2023 Touchon Pascal CEO Sell 42.5 -30,766 -4.35% ✗ $50.8K
Aug 16, 2023 Aug 18, 2023 Nguyen AnhCo EVP, Chief Sci. & Tech Officer Sell 46.3 -15,126 -5.02% ✗ $25K
Aug 16, 2023 Aug 18, 2023 Joshi Manher EVP, Chief Medical Officer Sell 46.3 -6,975 -3.66% ✗ $11.5K
Aug 16, 2023 Aug 18, 2023 Henrich Jill EVP, Global Head RA & Quality Sell 47.5 -3,346 -3.01% ✗ $5.5K
Jun 27, 2023 Jun 29, 2023 Touchon Pascal CEO Sell 46.3 -14,291 -1.98% ✗ $23.7K
Jun 9, 2023 Henrich Jill EVP, Global Head RA & Quality Neutral 52.5 - 0.00% ✗ -
Jun 9, 2023 Nguyen AnhCo EVP, Chief Sci. & Tech Officer Neutral 52.5 - 0.00% ✗ -
Jun 9, 2023 Joshi Manher EVP, Chief Medical Officer Neutral 52.5 - 0.00% ✗ -
May 31, 2023 Jun 2, 2023 SEIDENBERG BETH C Director Neutral 82.5 +57,000 2.94% ✗ -
May 31, 2023 Jun 2, 2023 Roncarolo Maria Grazia Director Neutral 90.0 +57,000 180.95% ✗ -
May 31, 2023 Jun 2, 2023 Gallagher Carol Giltner Director Neutral 90.0 +57,000 43.05% ✗ -
May 31, 2023 Jun 2, 2023 Fust Matthew K Director Neutral 90.0 +57,000 109.62% ✗ -
May 31, 2023 Jun 2, 2023 MALLIK AMEET Director Neutral 90.0 +57,000 278.05% ✗ -
May 31, 2023 Jun 2, 2023 DOBMEIER ERIC Director Neutral 90.0 +57,000 95.80% ✗ -
May 31, 2023 Jun 2, 2023 HEIDEN WILLIAM K Director Neutral 90.0 +57,000 109.62% ✗ -
May 16, 2023 May 18, 2023 Murugan Amar EVP, Chief Legal Officer Sell 46.3 -8,389 -3.00% ✗ $17.1K
May 16, 2023 May 18, 2023 Touchon Pascal CEO Sell 42.5 -29,766 -3.96% ✗ $60.6K
May 16, 2023 May 18, 2023 Banard Charlene A. EVP, Chief Technical Officer Sell 46.3 -19,040 -6.45% ✗ $38.8K
May 16, 2023 May 18, 2023 Hyllengren Eric J CFO Sell 46.3 -7,918 -3.38% ✗ $16.1K
Apr 7, 2023 Hyllengren Eric J CFO Neutral 52.5 - 0.00% ✗ -
Mar 2, 2023 Mar 6, 2023 Touchon Pascal CEO Sell 41.3 -15,679 -2.05% ✓ $56.9K
Mar 2, 2023 Mar 6, 2023 Murugan Amar SVP, GC & Secretary Sell 48.8 -4,221 -1.49% ✓ $15.3K
Mar 2, 2023 Mar 6, 2023 Koppikar Utpal CFO Sell 41.3 -6,871 -3.64% ✓ $24.9K
Mar 2, 2023 Mar 6, 2023 Dupont Jakob EVP, Head of R&D Sell 48.8 -5,074 -1.71% ✓ $18.4K
Mar 1, 2023 Mar 3, 2023 Touchon Pascal CEO Neutral 90.0 +324,711 73.51% ✗ -
Mar 1, 2023 Mar 3, 2023 Banard Charlene A. EVP, Chief Technical Officer Neutral 90.0 +139,700 89.93% ✗ -
Mar 1, 2023 Mar 3, 2023 Dupont Jakob EVP, Head of R&D Neutral 90.0 +141,328 91.45% ✗ -
Mar 1, 2023 Mar 3, 2023 Murugan Amar SVP, GC & Secretary Neutral 90.0 +155,375 121.22% ✗ -
Feb 7, 2023 Feb 9, 2023 Koppikar Utpal CFO Sell 48.8 -2,485 -1.30% ✓ $13.6K
Dec 16, 2022 Banard Charlene A. EVP, Chief Technical Officer Neutral 52.5 - 0.00% ✗ -