Insider Transactions Reported by 25 Insiders of Atara Biotherapeutics, Inc.

Symbol
ATRA on Nasdaq
Location
Thousand Oaks, CA

Insiders trading volume in the past year

Atara Biotherapeutics, Inc. executives and other stock owners filed with the SEC include:

Name Relationship Holdings Value Past Year Net Change Change % Report Date
Panacea Innovation Ltd 10%+ Owner $25,314,668 +$856,794 +3.5% 12 Jan 2026
Adiumentum Capital Fund I LP Director, Other*, 10%+ Owner $10,487,308 16 May 2025
Redmile Group, LLC Director $3,356,927 16 May 2025
AnhCo Nguyen President and CEO, Director $636,697 -$110,191 -15% 09 Mar 2026
Pascal Touchon Director $589,339 10 Jun 2025
Eric J. Hyllengren Former EVP, CFO & COO $393,448 31 Mar 2025
Carol Giltner Gallagher Director $249,570 10 Jun 2025
Yanina Grant-Huerta Chief Accounting Officer $231,622 -$70,489 -23% 09 Mar 2026
ERIC DOBMEIER Director $219,133 10 Nov 2023
Amar Murugan EVP, Chief Legal Officer $177,890 16 Aug 2024
WILLIAM K. HEIDEN Director $167,741 10 Jun 2025
Matthew K. Fust Director $137,501 10 Jun 2025
Maria Grazia Roncarolo Director $131,302 10 Jun 2025
Jill Henrich EVP, Chief Regulatory Officer $130,697 03 Mar 2025
AMEET MALLIK Director $127,975 10 Jun 2025
Jakob Dupont EVP, Head of R&D $113,119 02 Mar 2023
Charlene A. Banard EVP, Chief Technical Officer $107,368 16 May 2023
Utpal Koppikar Chief Financial Officer $70,789 02 Mar 2023
Kristin Yarema Chief Commercial Officer $66,680 01 Mar 2022
Manher Joshi EVP, Chief Medical Officer $66,629 16 Nov 2023
BETH C. SEIDENBERG Director $45,080 31 May 2023
Joe Newell Chief Operations Officer $43,995 16 Nov 2021
Roy D. Baynes Director $16,922 23 Jun 2022
Ronald C. Renaud JR Director $12,254 23 Jun 2022
Nachiappan Subramanian Director 16 May 2025

Recent Insider Transactions by Companies or Individuals for Atara Biotherapeutics, Inc.

Insider Symbol Class Transaction % Value $ * Price $ Shares Shares Owned Date Ownership
AnhCo Nguyen ATRA Common Stock Award 130.8% 81,100 143,078 09 Mar 2026 Direct
Yanina Grant-Huerta ATRA Common Stock Award 63.9% 20,300 52,050 09 Mar 2026 Direct
Yanina Grant-Huerta ATRA Common Stock Sale -6.21% $10,691 $5.08 -2,104 31,750 02 Mar 2026 Direct
AnhCo Nguyen ATRA Common Stock Sale -4.61% $15,237 $5.09 -2,996 61,978 02 Mar 2026 Direct
Panacea Innovation Ltd ATRA Common Stock Sale -5.73% -80,554 1,324,446 12 Jan 2026 See Footnotes
Panacea Innovation Ltd ATRA Common Stock Tax liability -1 48,736 28 Nov 2025 See Footnotes
Panacea Innovation Ltd ATRA Common Stock Options Exercise 48,737 48,737 28 Nov 2025 See Footnotes
Panacea Innovation Ltd ATRA Warrants Options Exercise -15.8% -48,737 259,163 28 Nov 2025 See Footnotes
AnhCo Nguyen ATRA Common Stock Sale -4.29% $38,437 $13.19 -2,915 64,974 17 Nov 2025 Direct
Yanina Grant-Huerta ATRA Common Stock Sale -5.12% $23,788 $13.19 -1,804 33,454 17 Nov 2025 Direct
AnhCo Nguyen ATRA Common Stock Sale -4.18% $34,360 $11.62 -2,958 67,889 18 Aug 2025 Direct
Yanina Grant-Huerta ATRA Common Stock Sale -4.88% $21,009 $11.61 -1,809 35,258 18 Aug 2025 Direct
Panacea Innovation Ltd ATRA Common Stock Purchase 4.07% $670,422 $12.19 55,000 1,405,000 15 Aug 2025 See Footnotes
Panacea Innovation Ltd ATRA Common Stock Purchase 1.45% $186,372 $9.64 19,335 1,350,000 17 Jul 2025 See Footnotes
Carol Giltner Gallagher ATRA Common Stock Award 31.1% 7,828 33,012 10 Jun 2025 Direct
Matthew K. Fust ATRA Common Stock Award 75.6% 7,828 18,188 10 Jun 2025 Direct
Pascal Touchon ATRA Common Stock Award 11.2% 7,828 77,955 10 Jun 2025 Direct
Maria Grazia Roncarolo ATRA Common Stock Award 82% 7,828 17,368 10 Jun 2025 Direct
AMEET MALLIK ATRA Common Stock Award 86% 7,828 16,928 10 Jun 2025 Direct
WILLIAM K. HEIDEN ATRA Common Stock Award 54.5% 7,828 22,188 10 Jun 2025 Direct
Yanina Grant-Huerta ATRA Common Stock Sale -5.65% $15,000 $6.76 -2,218 37,067 16 May 2025 Direct
AnhCo Nguyen ATRA Common Stock Sale -4.42% $22,156 $6.76 -3,276 70,847 16 May 2025 Direct
Adiumentum Capital Fund I LP ATRA Common Stock Award 6.67% 75,572 1,209,395 16 May 2025 Direct
Adiumentum Capital Fund I LP ATRA Warrants (right to buy) Award 151.1% 227,000 377,193 16 May 2025 Direct
Eric J. Hyllengren ATRA Employee Stock Option (Right to Buy) Disposed to Issuer -100% -13,838 0 31 Mar 2025 Direct
AnhCo Nguyen ATRA Common Stock Sale -4.3% $23,307 $7.00 -3,331 74,123 03 Mar 2025 Direct
Eric J. Hyllengren ATRA Common Stock Sale -2.11% $8,473 $7.00 -1,211 56,231 03 Mar 2025 Direct
Jill Henrich ATRA Common Stock Sale -5.37% $7,410 $7.00 -1,059 18,679 03 Mar 2025 Direct
Eric J. Hyllengren ATRA Common Stock Award 145.6% 34,050 57,442 27 Jan 2025 Direct
Jill Henrich ATRA Common Stock Sale -4.91% $11,198 $11.20 -1,000 19,378 18 Nov 2024 Direct
Eric J. Hyllengren ATRA Common Stock Sale -5.51% $15,274 $11.20 -1,364 23,392 18 Nov 2024 Direct
AnhCo Nguyen ATRA Common Stock Sale -2.1% $18,633 $11.20 -1,664 77,454 18 Nov 2024 Direct
AnhCo Nguyen ATRA Common Stock Award 131.9% 45,000 79,118 09 Sep 2024 Direct
Pascal Touchon ATRA Common Stock Sale -4.15% $20,139 $6.63 -3,038 70,127 16 Aug 2024 Direct
AnhCo Nguyen ATRA Common Stock Sale -5.07% $12,072 $6.63 -1,821 34,118 16 Aug 2024 Direct
Amar Murugan ATRA Common Stock Sale -4.14% $7,677 $6.63 -1,158 26,827 16 Aug 2024 Direct
Eric J. Hyllengren ATRA Common Stock Sale -4.14% $7,093 $6.63 -1,070 24,756 16 Aug 2024 Direct
Jill Henrich ATRA Common Stock Sale -4.51% $6,384 $6.63 -963 20,378 16 Aug 2024 Direct
Pascal Touchon ATRA Employee Stock Option (Right to Buy) Disposed to Issuer -100% -25,755 0 12 Aug 2024 Direct
Pascal Touchon ATRA Common Stock Sale -4.27% $50,289 $0.6170 -81,506 1,829,146 16 May 2024 Direct
AnhCo Nguyen ATRA Common Stock Sale -4.56% $26,469 $0.6170 -42,899 898,498 16 May 2024 Direct
Amar Murugan ATRA Common Stock Sale -4.45% $19,991 $0.6170 -32,401 695,120 16 May 2024 Direct
Eric J. Hyllengren ATRA Common Stock Sale -4.25% $17,676 $0.6170 -28,648 645,671 16 May 2024 Direct
Jill Henrich ATRA Common Stock Sale -4.64% $15,888 $0.6170 -25,750 529,251 16 May 2024 Direct
Matthew K. Fust ATRA Common Stock Award 137.6% 150,000 259,000 31 Mar 2024 Direct
WILLIAM K. HEIDEN ATRA Common Stock Award 71.8% 150,000 359,000 31 Mar 2024 Direct
Maria Grazia Roncarolo ATRA Common Stock Award 169.5% 150,000 238,500 31 Mar 2024 Direct
Carol Giltner Gallagher ATRA Common Stock Award 31.3% 150,000 629,608 31 Mar 2024 Direct
AMEET MALLIK ATRA Common Stock Award 193.6% 150,000 227,500 31 Mar 2024 Direct
Pascal Touchon ATRA Common Stock Sale -1.28% $17,888 $0.7200 -24,844 1,910,652 04 Mar 2024 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.