Atara Biotherapeutics, Inc. ($ATRA) Insider Transactions

Last updated: 2026-03-19 21:03 UTC | Total transactions: 150

In the last 12 months, insiders at Atara Biotherapeutics, Inc. ($ATRA) filed 150 transactions with the SEC: 6 open-market purchases totaling $1,051,679 and 81 sales totaling $1,409,627. Net insider sentiment: net selling.

Atara Biotherapeutics, Inc. operates in the Biological products, (no disgnostic substances) industry (Life sciences sector).

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View all SEC Filings for Atara Biotherapeutics, Inc. (ATRA).

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Recent Insider Transactions

Transaction Date Insider Name Title Transaction Type Security Shares Price Shares Owned Following Total Shares Outstanding % of Owned % of Outstanding
March 17, 2026 Panacea Innovation Ltd Not found M Warrants 259163 $6.61 0.0000 13,564,000 100.00% 1.91%
March 17, 2026 Panacea Innovation Ltd Not found M Common Stock 259163 $0.00 1,632,345.0000 13,564,000 18.87% 1.91%
March 17, 2026 Panacea Innovation Ltd Not found F Common Stock 5 $5.23 1,632,340.0000 13,564,000 0.00% 0.00%
March 9, 2026 Grant-Huerta Yanina Chief Accounting Officer A Common Stock 20300 $0.00 52,050.0000 13,564,000 63.94% 0.15%
March 9, 2026 Nguyen AnhCo President and CEO A Common Stock 81100 $0.00 143,078.0000 13,564,000 130.85% 0.60%
March 2, 2026 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 24 $5.08 33,830.0000 13,564,000 0.07% 0.00%
March 2, 2026 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 377 $5.08 31,850.0000 13,564,000 1.17% 0.00%
March 2, 2026 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 100 $5.08 31,750.0000 13,564,000 0.31% 0.00%
March 2, 2026 Nguyen AnhCo President and CEO S Common Stock 198 $5.08 64,776.0000 13,564,000 0.30% 0.00%
March 2, 2026 Nguyen AnhCo President and CEO S Common Stock 58 $5.08 64,718.0000 13,564,000 0.09% 0.00%
March 2, 2026 Nguyen AnhCo President and CEO S Common Stock 1442 $5.09 61,978.0000 13,564,000 2.27% 0.01%
March 2, 2026 Nguyen AnhCo President and CEO S Common Stock 1298 $5.09 63,420.0000 13,564,000 2.01% 0.01%
March 2, 2026 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 1603 $5.08 32,227.0000 13,564,000 4.74% 0.01%
Jan. 12, 2026 Panacea Innovation Ltd Not found S Common Stock 80554 $6.07 1,373,182.0000 13,564,000 5.54% 0.59%
Nov. 28, 2025 Panacea Innovation Ltd Not found M Common Stock 48737 $0.00 1,453,737.0000 13,564,000 3.47% 0.36%
Nov. 28, 2025 Panacea Innovation Ltd Not found M Warrants 48737 $6.61 259,163.0000 13,564,000 15.83% 0.36%
Nov. 28, 2025 Panacea Innovation Ltd Not found F Common Stock 1 $14.03 1,453,736.0000 13,564,000 0.00% 0.00%
Nov. 17, 2025 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 1645 $13.19 33,613.0000 13,564,000 4.67% 0.01%
Nov. 17, 2025 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 74 $13.19 33,454.0000 13,564,000 0.22% 0.00%
Nov. 17, 2025 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 85 $13.19 33,528.0000 13,564,000 0.25% 0.00%
Nov. 17, 2025 Nguyen AnhCo President and CEO S Common Stock 56 $13.19 64,974.0000 13,564,000 0.09% 0.00%
Nov. 17, 2025 Nguyen AnhCo President and CEO S Common Stock 2859 $13.19 65,030.0000 13,564,000 4.21% 0.02%
Aug. 18, 2025 Nguyen AnhCo President and CEO S Common Stock 57 $11.61 70,790.0000 7,488,000 0.08% 0.00%
Aug. 18, 2025 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 1668 $11.61 35,258.0000 7,488,000 4.52% 0.02%
Aug. 18, 2025 Nguyen AnhCo President and CEO S Common Stock 1620 $11.62 67,889.0000 7,488,000 2.33% 0.02%
Aug. 18, 2025 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 55 $11.61 37,012.0000 7,488,000 0.15% 0.00%
Aug. 18, 2025 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 86 $11.61 36,926.0000 7,488,000 0.23% 0.00%
Aug. 18, 2025 Nguyen AnhCo President and CEO S Common Stock 1281 $11.62 69,509.0000 7,488,000 1.81% 0.02%
Aug. 15, 2025 Panacea Innovation Ltd Not found P Common Stock 55000 $12.19 1,405,000.0000 7,488,000 4.07% 0.73%
July 17, 2025 Panacea Innovation Ltd Not found P Common Stock 19335 $9.64 1,350,000.0000 7,488,000 1.45% 0.26%
June 10, 2025 Fust Matthew K Not found A Common Stock 7828 $0.00 18,188.0000 7,488,000 75.56% 0.10%
June 10, 2025 Gallagher Carol Giltner Not found A Common Stock 7828 $0.00 33,012.0000 7,488,000 31.08% 0.10%
June 10, 2025 Touchon Pascal Not found A Common Stock 7828 $0.00 77,955.0000 7,488,000 11.16% 0.10%
June 10, 2025 Roncarolo Maria Grazia Not found A Common Stock 7828 $0.00 17,368.0000 7,488,000 82.05% 0.10%
June 10, 2025 MALLIK AMEET Not found A Common Stock 7828 $0.00 16,928.0000 7,488,000 86.02% 0.10%
June 10, 2025 HEIDEN WILLIAM K Not found A Common Stock 7828 $0.00 22,188.0000 7,488,000 54.51% 0.10%
May 16, 2025 Nguyen AnhCo President and CEO S Common Stock 3276 $6.76 70,847.0000 7,488,000 4.42% 0.04%
May 16, 2025 Grant-Huerta Yanina Chief Accounting Officer S Common Stock 2218 $6.76 37,067.0000 7,488,000 5.65% 0.03%
May 16, 2025 Adiumentum Capital Fund I LP Other A Common Stock 75572 $6.61 1,209,395.0000 7,488,000 6.67% 1.01%
May 16, 2025 Adiumentum Capital Fund I LP Other A Warrants (right to buy) 227000 $6.61 377,193.0000 7,488,000 151.14% 3.03%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 154 $0.00 0.0000 7,488,000 100.00% 0.00%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 381 $0.00 0.0000 7,488,000 100.00% 0.01%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 350 $0.00 0.0000 7,488,000 100.00% 0.00%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 262 $0.00 0.0000 7,488,000 100.00% 0.00%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 543 $0.00 160.0000 7,488,000 77.24% 0.01%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 8961 $0.00 2,656.0000 7,488,000 77.14% 0.12%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 331 $0.00 0.0000 7,488,000 100.00% 0.00%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 1900 $0.00 0.0000 7,488,000 100.00% 0.03%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 460 $0.00 0.0000 7,488,000 100.00% 0.01%
March 31, 2025 Hyllengren Eric J Not found D Employee Stock Option (Right to Buy) 496 $0.00 0.0000 7,488,000 100.00% 0.01%
March 3, 2025 Henrich Jill EVP, Chief Regulatory Officer S Common Stock 1059 $7.00 18,679.0000 7,488,000 5.37% 0.01%
March 3, 2025 Nguyen AnhCo President and CEO S Common Stock 3331 $7.00 74,123.0000 7,488,000 4.30% 0.04%
March 3, 2025 Hyllengren Eric J EVP, CFO and COO S Common Stock 1211 $7.00 56,231.0000 7,488,000 2.11% 0.02%
Jan. 27, 2025 Hyllengren Eric J EVP, CFO and COO A Common Stock 34050 $0.00 57,442.0000 7,488,000 145.56% 0.45%
Nov. 18, 2024 Nguyen AnhCo President and CEO S Common Stock 1664 $11.20 77,454.0000 7,466,000 2.10% 0.02%
Nov. 18, 2024 Hyllengren Eric J EVP, CFO and COO S Common Stock 1364 $11.20 23,392.0000 7,466,000 5.51% 0.02%
Nov. 18, 2024 Henrich Jill EVP, Chief Regulatory Officer S Common Stock 1000 $11.20 19,378.0000 7,466,000 4.91% 0.01%
Sept. 9, 2024 Nguyen AnhCo President and CEO A Common Stock 45000 $0.00 79,118.0000 4,236,000 131.90% 1.06%
Aug. 16, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 1468 $6.63 34,471.0000 4,236,000 4.08% 0.03%
Aug. 16, 2024 Touchon Pascal President and CEO S Common Stock 276 $6.63 70,127.0000 4,236,000 0.39% 0.01%
Aug. 16, 2024 Henrich Jill EVP, Global Head RA & Quality S Common Stock 132 $6.63 20,378.0000 4,236,000 0.64% 0.00%
Aug. 16, 2024 Henrich Jill EVP, Global Head RA & Quality S Common Stock 831 $6.63 20,510.0000 4,236,000 3.89% 0.02%
Aug. 16, 2024 Hyllengren Eric J EVP, CFO S Common Stock 29 $6.63 24,756.0000 4,236,000 0.12% 0.00%
Aug. 16, 2024 Hyllengren Eric J EVP, CFO S Common Stock 1041 $6.63 24,785.0000 4,236,000 4.03% 0.02%
Aug. 16, 2024 Murugan Amar EVP, Chief Legal Officer S Common Stock 89 $6.63 26,827.0000 4,236,000 0.33% 0.00%
Aug. 16, 2024 Murugan Amar EVP, Chief Legal Officer S Common Stock 192 $6.63 26,916.0000 4,236,000 0.71% 0.00%
Aug. 16, 2024 Murugan Amar EVP, Chief Legal Officer S Common Stock 877 $6.63 27,108.0000 4,236,000 3.13% 0.02%
Aug. 16, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 56 $6.63 34,118.0000 4,236,000 0.16% 0.00%
Aug. 16, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 297 $6.63 34,174.0000 4,236,000 0.86% 0.01%
Aug. 16, 2024 Touchon Pascal President and CEO S Common Stock 2762 $6.63 70,403.0000 4,236,000 3.78% 0.07%
Aug. 12, 2024 Touchon Pascal President and CEO D Employee Stock Option (Right to Buy) 9000 $0.00 0.0000 4,236,000 100.00% 0.21%
Aug. 12, 2024 Touchon Pascal President and CEO D Employee Stock Option (Right to Buy) 7075 $0.00 0.0000 4,236,000 100.00% 0.17%
Aug. 12, 2024 Touchon Pascal President and CEO D Employee Stock Option (Right to Buy) 9680 $0.00 0.0000 4,236,000 100.00% 0.23%
May 16, 2024 Hyllengren Eric J EVP, CFO S Common Stock 28648 $0.62 645,671.0000 4,236,000 4.25% 0.68%
May 16, 2024 Murugan Amar EVP, Chief Legal Officer S Common Stock 32401 $0.62 695,120.0000 4,236,000 4.45% 0.76%
May 16, 2024 Henrich Jill EVP, Global Head RA & Quality S Common Stock 25750 $0.62 529,251.0000 4,236,000 4.64% 0.61%
May 16, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 42899 $0.62 898,498.0000 4,236,000 4.56% 1.01%
May 16, 2024 Touchon Pascal President and CEO S Common Stock 81506 $0.62 1,829,146.0000 4,236,000 4.27% 1.92%
March 31, 2024 HEIDEN WILLIAM K Not found A Common Stock 150000 $0.00 359,000.0000 4,236,000 71.77% 3.54%
March 31, 2024 Fust Matthew K Not found A Common Stock 150000 $0.00 259,000.0000 4,236,000 137.61% 3.54%
March 31, 2024 Roncarolo Maria Grazia Not found A Common Stock 150000 $0.00 238,500.0000 4,236,000 169.49% 3.54%
March 31, 2024 Gallagher Carol Giltner Not found A Common Stock 150000 $0.00 629,608.0000 4,236,000 31.28% 3.54%
March 31, 2024 MALLIK AMEET Not found A Common Stock 150000 $0.00 227,500.0000 4,236,000 193.55% 3.54%
March 4, 2024 Murugan Amar EVP, Chief Legal Officer S Common Stock 10044 $0.72 727,521.0000 4,236,000 1.36% 0.24%
March 4, 2024 Hyllengren Eric J EVP, CFO S Common Stock 1462 $0.72 679,536.0000 4,236,000 0.21% 0.03%
March 4, 2024 Hyllengren Eric J EVP, CFO S Common Stock 5217 $0.72 674,319.0000 4,236,000 0.77% 0.12%
March 4, 2024 Henrich Jill EVP, Global Head RA & Quality S Common Stock 3879 $0.72 555,001.0000 4,236,000 0.69% 0.09%
March 4, 2024 Touchon Pascal President and CEO S Common Stock 24844 $0.72 1,910,652.0000 4,236,000 1.28% 0.59%
March 4, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 10746 $0.72 941,397.0000 4,236,000 1.13% 0.25%
Jan. 8, 2024 Murugan Amar EVP, Chief Legal Officer A Common Stock 475000 $0.00 737,565.0000 4,236,000 180.91% 11.21%
Jan. 8, 2024 Hyllengren Eric J EVP, CFO A Common Stock 475000 $0.00 680,998.0000 4,236,000 230.58% 11.21%
Jan. 8, 2024 Henrich Jill EVP, Global Head RA & Quality A Common Stock 450000 $0.00 558,880.0000 4,236,000 413.30% 10.62%
Jan. 8, 2024 Touchon Pascal President and CEO A Common Stock 1280000 $0.00 1,935,496.0000 4,236,000 195.27% 30.22%
Jan. 8, 2024 Nguyen AnhCo EVP, Chief Sci. & Tech Officer A Common Stock 675000 $0.00 952,143.0000 4,236,000 243.56% 15.94%
Nov. 16, 2023 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 8856 $0.39 277,143.0000 0 3.10% 0.00%
Nov. 16, 2023 Henrich Jill EVP, Global Head RA & Quality S Common Stock 3267 $0.39 104,424.0000 0 3.03% 0.00%
Nov. 16, 2023 Joshi Manher EVP, Chief Medical Officer S Common Stock 12287 $0.39 171,284.0000 0 6.69% 0.00%
Nov. 16, 2023 Touchon Pascal President and CEO S Common Stock 20409 $0.39 655,496.0000 0 3.02% 0.00%
Nov. 16, 2023 Murugan Amar EVP, Chief Legal Officer S Common Stock 8307 $0.39 257,084.0000 0 3.13% 0.00%
Nov. 16, 2023 Hyllengren Eric J SVP, CFO S Common Stock 11958 $0.39 205,998.0000 0 5.49% 0.00%
Nov. 14, 2023 Gallagher Carol Giltner Not found P Common Stock 90980 $0.31 459,418.0000 0 24.69% 0.00%
Nov. 13, 2023 Gallagher Carol Giltner Not found P Common Stock 179020 $0.22 368,438.0000 0 94.51% 0.00%
Nov. 10, 2023 DOBMEIER ERIC Not found P Common Stock 446825 $0.23 563,325.0000 0 383.54% 0.00%
Nov. 10, 2023 HEIDEN WILLIAM K Not found P Common Stock 100000 $0.25 209,000.0000 0 91.74% 0.00%
Aug. 16, 2023 Joshi Manher EVP, Chief Medical Officer S Common Stock 3773 $1.65 183,571.0000 0 2.01% 0.00%
Aug. 16, 2023 Hyllengren Eric J SVP, CFO S Common Stock 6408 $1.65 219,734.0000 0 2.83% 0.00%
Aug. 16, 2023 Hyllengren Eric J SVP, CFO S Common Stock 1778 $1.65 217,956.0000 0 0.81% 0.00%
Aug. 16, 2023 Murugan Amar EVP, Chief Legal Officer S Common Stock 5050 $1.65 269,013.0000 0 1.84% 0.00%
Aug. 16, 2023 Murugan Amar EVP, Chief Legal Officer S Common Stock 3622 $1.65 265,391.0000 0 1.35% 0.00%
Aug. 16, 2023 Touchon Pascal President and CEO S Common Stock 21432 $1.65 685,239.0000 0 3.03% 0.00%
Aug. 16, 2023 Touchon Pascal President and CEO S Common Stock 9334 $1.65 675,905.0000 0 1.36% 0.00%
Aug. 16, 2023 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 5849 $1.65 295,276.0000 0 1.94% 0.00%
Aug. 16, 2023 Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 9277 $1.65 285,999.0000 0 3.14% 0.00%
Aug. 16, 2023 Joshi Manher EVP, Chief Medical Officer S Common Stock 3202 $1.65 187,344.0000 0 1.68% 0.00%
Aug. 16, 2023 Henrich Jill EVP, Global Head RA & Quality S Common Stock 2788 $1.65 108,249.0000 0 2.51% 0.00%
Aug. 16, 2023 Henrich Jill EVP, Global Head RA & Quality S Common Stock 558 $1.65 107,691.0000 0 0.52% 0.00%
June 27, 2023 Touchon Pascal President and CEO S Common Stock 14291 $1.66 706,671.0000 0 1.98% 0.00%
May 31, 2023 HEIDEN WILLIAM K Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 HEIDEN WILLIAM K Not found A Common Stock 57000 $0.00 109,000.0000 0 109.62% 0.00%
May 31, 2023 DOBMEIER ERIC Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 DOBMEIER ERIC Not found A Common Stock 57000 $0.00 116,500.0000 0 95.80% 0.00%
May 31, 2023 MALLIK AMEET Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 MALLIK AMEET Not found A Common Stock 57000 $0.00 77,500.0000 0 278.05% 0.00%
May 31, 2023 Fust Matthew K Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 Fust Matthew K Not found A Common Stock 57000 $0.00 109,000.0000 0 109.62% 0.00%
May 31, 2023 Gallagher Carol Giltner Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 Gallagher Carol Giltner Not found A Common Stock 57000 $0.00 189,418.0000 0 43.05% 0.00%
May 31, 2023 Roncarolo Maria Grazia Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 Roncarolo Maria Grazia Not found A Common Stock 57000 $0.00 88,500.0000 0 180.95% 0.00%
May 31, 2023 SEIDENBERG BETH C Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 SEIDENBERG BETH C Not found A Common Stock 57000 $0.00 1,992,733.0000 0 2.94% 0.00%
May 16, 2023 Hyllengren Eric J SVP, CFO S Common Stock 6199 $2.04 227,861.0000 0 2.65% 0.00%
May 16, 2023 Murugan Amar EVP, Chief Legal Officer S Common Stock 985 $2.04 270,945.0000 0 0.36% 0.00%
May 16, 2023 Banard Charlene A. EVP, Chief Technical Officer S Common Stock 19040 $2.04 276,010.0000 0 6.45% 0.00%
May 16, 2023 Touchon Pascal President and CEO S Common Stock 29766 $2.04 720,962.0000 0 3.96% 0.00%
May 16, 2023 Hyllengren Eric J SVP, CFO S Common Stock 1719 $2.04 226,142.0000 0 0.75% 0.00%
May 16, 2023 Murugan Amar EVP, Chief Legal Officer S Common Stock 7404 $2.04 271,930.0000 0 2.65% 0.00%
March 2, 2023 Touchon Pascal President and CEO S Common Stock 15679 $3.63 750,728.0000 0 2.05% 0.00%
March 2, 2023 Murugan Amar SVP, GC & Secretary S Common Stock 4221 $3.63 279,334.0000 0 1.49% 0.00%
March 2, 2023 Koppikar Utpal Chief Financial Officer S Common Stock 6871 $3.63 181,978.0000 0 3.64% 0.00%
March 2, 2023 Dupont Jakob EVP, Head of R&D S Common Stock 5074 $3.63 290,794.0000 0 1.71% 0.00%
March 1, 2023 Banard Charlene A. EVP, Chief Technical Officer A Employee Stock Option (Right to Buy) 314325 $0.00 314,325.0000 0 9999.99% 0.00%
March 1, 2023 Dupont Jakob EVP, Head of R&D A Employee Stock Option (Right to Buy) 317987 $0.00 317,987.0000 0 9999.99% 0.00%
March 1, 2023 Murugan Amar SVP, GC & Secretary A Common Stock 155375 $0.00 283,555.0000 0 121.22% 0.00%
March 1, 2023 Murugan Amar SVP, GC & Secretary A Employee Stock Option (Right to Buy) 349593 $0.00 349,593.0000 0 9999.99% 0.00%
March 1, 2023 Dupont Jakob EVP, Head of R&D A Common Stock 141328 $0.00 295,868.0000 0 91.45% 0.00%
March 1, 2023 Touchon Pascal President and CEO A Common Stock 324711 $0.00 766,407.0000 0 73.51% 0.00%
March 1, 2023 Touchon Pascal President and CEO A Employee Stock Option (Right to Buy) 730600 $0.00 730,600.0000 0 9999.99% 0.00%
March 1, 2023 Banard Charlene A. EVP, Chief Technical Officer A Common Stock 139700 $0.00 295,050.0000 0 89.93% 0.00%
Feb. 7, 2023 Koppikar Utpal Chief Financial Officer S Common Stock 2485 $5.46 188,849.0000 0 1.30% 0.00%