Atara Biotherapeutics, Inc.
Total Trades
68
Buys
4
Sells
58
Largest Trade
N/A
Insiders
14
Institutional Funds
29
Inst. Value
$1M+
Activist Filings
35
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Grant-Huerta Yanina | Chief Accounting O… | SELL | $1K–$15K | 2K | $5.08 | Mar 4, 2026 |
| Nguyen AnhCo | President and CEO | SELL | $15K–$50K | 3K | $5.09 | Mar 4, 2026 |
| Panacea Innovation Ltd | 10% Owner | SELL | $100K–$500K | 81K | $6.07 | Jan 15, 2026 |
| Nguyen AnhCo | President and CEO | SELL | $15K–$50K | 3K | $13.19 | Nov 19, 2025 |
| Grant-Huerta Yanina | Chief Accounting O… | SELL | $15K–$50K | 2K | $13.19 | Nov 19, 2025 |
| Panacea Innovation Ltd | 10% Owner | BUY | $100K–$500K | 19K | $9.64 | Jul 21, 2025 |
| Grant-Huerta Yanina | Chief Accounting O… | SELL | $15K–$50K | 2K | $6.76 | May 20, 2025 |
| Nguyen AnhCo | President and CEO | SELL | $15K–$50K | 3K | $6.76 | May 20, 2025 |
| Henrich Jill | EVP | SELL | $1K–$15K | 1K | $11.20 | Nov 20, 2024 |
| Hyllengren Eric J | EVP, CFO and COO | SELL | $15K–$50K | 1K | $11.20 | Nov 20, 2024 |
| Nguyen AnhCo | President and CEO | SELL | $15K–$50K | 2K | $11.20 | Nov 20, 2024 |
| Touchon Pascal | President and CEO | SELL | $15K–$50K | 3K | $6.63 | Aug 20, 2024 |
| Nguyen AnhCo | EVP | SELL | $1K–$15K | 2K | $6.63 | Aug 20, 2024 |
| Murugan Amar | EVP | SELL | $1K–$15K | 1K | $6.63 | Aug 20, 2024 |
| Hyllengren Eric J | EVP, CFO | SELL | $1K–$15K | 1K | $6.63 | Aug 20, 2024 |
| Henrich Jill | EVP | SELL | $1K–$15K | 963 | $6.63 | Aug 20, 2024 |
| Touchon Pascal | President and CEO | SELL | $1K–$15K | 20K | $0.39 | Nov 20, 2023 |
| Nguyen AnhCo | EVP | SELL | $1K–$15K | 9K | $0.39 | Nov 20, 2023 |
| Murugan Amar | EVP | SELL | $1K–$15K | 8K | $0.39 | Nov 20, 2023 |
| Joshi Manher | EVP | SELL | $1K–$15K | 12K | $0.39 | Nov 20, 2023 |
| Hyllengren Eric J | SVP, CFO | SELL | $1K–$15K | 12K | $0.39 | Nov 20, 2023 |
| Henrich Jill | EVP | SELL | $1K–$15K | 3K | $0.39 | Nov 20, 2023 |
| Gallagher Carol Giltner | Director | BUY | $50K–$100K | 270K | $0.25 | Nov 15, 2023 |
| HEIDEN WILLIAM K | Director | BUY | $15K–$50K | 100K | $0.25 | Nov 14, 2023 |
| DOBMEIER ERIC | Director | BUY | $100K–$500K | 447K | $0.23 | Nov 14, 2023 |
| Hyllengren Eric J | SVP, CFO | SELL | $1K–$15K | 8K | $1.65 | Aug 18, 2023 |
| Murugan Amar | EVP | SELL | $1K–$15K | 9K | $1.65 | Aug 18, 2023 |
| Touchon Pascal | President and CEO | SELL | $50K–$100K | 31K | $1.65 | Aug 18, 2023 |
| Nguyen AnhCo | EVP | SELL | $15K–$50K | 15K | $1.65 | Aug 18, 2023 |
| Joshi Manher | EVP | SELL | $1K–$15K | 7K | $1.65 | Aug 18, 2023 |
| Henrich Jill | EVP | SELL | $1K–$15K | 3K | $1.65 | Aug 18, 2023 |
| Touchon Pascal | President and CEO | SELL | $15K–$50K | 14K | $1.66 | Jun 29, 2023 |
| Murugan Amar | EVP | SELL | $15K–$50K | 8K | $2.04 | May 19, 2023 |
| Banard Charlene A. | EVP | SELL | $15K–$50K | 19K | $2.04 | May 19, 2023 |
| Touchon Pascal | President and CEO | SELL | $50K–$100K | 30K | $2.04 | May 19, 2023 |
| Hyllengren Eric J | SVP, CFO | SELL | $15K–$50K | 8K | $2.04 | May 19, 2023 |
| Touchon Pascal | President and CEO | SELL | $50K–$100K | 16K | $3.63 | Mar 6, 2023 |
| Murugan Amar | SVP, GC & Secretary | SELL | $15K–$50K | 4K | $3.63 | Mar 6, 2023 |
| Koppikar Utpal | CFO | SELL | $15K–$50K | 7K | $3.63 | Mar 6, 2023 |
| Dupont Jakob | EVP, Head of R&D | SELL | $15K–$50K | 5K | $3.63 | Mar 6, 2023 |
| Koppikar Utpal | CFO | SELL | $1K–$15K | 2K | $5.46 | Feb 9, 2023 |
| Dupont Jakob | EVP, Head of R&D | SELL | $15K–$50K | 4K | $4.49 | Nov 19, 2022 |
| Touchon Pascal | President and CEO | SELL | $50K–$100K | 16K | $4.49 | Nov 19, 2022 |
| Murugan Amar | SVP, GC & Secretary | SELL | $15K–$50K | 4K | $4.49 | Nov 19, 2022 |
| Koppikar Utpal | CFO | SELL | $15K–$50K | 6K | $4.49 | Nov 19, 2022 |
| Touchon Pascal | President and CEO | SELL | $50K–$100K | 15K | $5.04 | Aug 18, 2022 |
| Dupont Jakob | EVP, Head of R&D | SELL | $15K–$50K | 4K | $5.03 | Aug 18, 2022 |
| Murugan Amar | SVP, GC & Secretary | SELL | $15K–$50K | 3K | $5.03 | Aug 18, 2022 |
| Koppikar Utpal | CFO | SELL | $15K–$50K | 6K | $5.04 | Aug 18, 2022 |
| Touchon Pascal | President and CEO | SELL | $100K–$500K | 14K | $7.20 | Jun 29, 2022 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 29 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Redmile Group, LLC | 442K | $1M+ | SH |
| VANGUARD GROUP INC | 191K | $1M+ | SH |
| GLOBEFLEX CAPITAL L P | 77K | $1M+ | SH |
| MACKENZIE FINANCIAL CORP | 59K | $1M+ | SH |
| ACADIAN ASSET MANAGEMENT LLC | 54K | $500K+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 51K | $500K+ | SH |
| STALEY CAPITAL ADVISERS INC | 50K | $500K+ | SH |
| RENAISSANCE TECHNOLOGIES LLC | 30K | $500K+ | SH |
| STATE STREET CORP | 26K | $100K–$500K | SH |
| Cambridge Investment Research Advisors, Inc. | 23K | $100K–$500K | SH |
| Point72 Asset Management, L.P. | 18K | $100K–$500K | SH |
| Walleye Capital LLC | 12K | $100K–$500K | SH |
| Connor, Clark & Lunn Investment Management Ltd. | 10K | $100K–$500K | SH |
| JANE STREET GROUP, LLC | 10K | $100K–$500K | SH |
| DIMENSIONAL FUND ADVISORS LP | 8K | $100K–$500K | SH |
| SBI Securities Co., Ltd. | 1K | $15K–$50K | SH |
| UBS Group AG | 1K | $15K–$50K | SH |
| MARSHALL WACE, LLP | 1K | $15K–$50K | SH |
| Private Wealth Asset Management, LLC | 900 | $15K–$50K | SH |
| BlackRock, Inc. | 535 | $1K–$15K | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13D/A · Jan 15, 2026
20.0%
1.6M shares
SC 13D/A · Nov 14, 2025
9.9%
751K shares
SC 13G/A · Nov 14, 2025
9.9%
716K shares
SC 13D/A · Aug 20, 2025
20.0%
1.7M shares
SC 13D · May 23, 2025
9.9%
705K shares
SC 13D · May 21, 2025
20.0%
1.6M shares
SC 13D/A · May 16, 2025
20.0%
1.4M shares
SC 13G/A · May 16, 2025
9.9%
601K shares
Panacea Venture Healthcare Fund II, L.P.
SC 13G · Feb 6, 2025
9.5%
550K shares
SC 13G/A · Nov 14, 2024
10.0%
493K shares
SC 13G/A · Nov 14, 2024
4.6%
6 shares
SC 13G/A · Nov 12, 2024
3.2%
181K shares
SC 13G/A · Nov 4, 2024
3.2%
181K shares
SC 13G/A · Sep 13, 2024
9.9%
580K shares
SC 13D/A · Sep 5, 2024
20.0%
1.1M shares
SC 13G/A · Jul 8, 2024
0.0%
0 shares
SC 13D · May 22, 2024
6.7%
8.1M shares
SC 13G · Mar 18, 2024
6.4%
6 shares
SC 13G/A · Feb 14, 2024
0.0%
0 shares
SC 13G/A · Feb 14, 2024
9.9%
10.3M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
6.6%
6.7M shares
SC 13G/A · Jan 26, 2024
7.0%
7.1M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G/A · Jan 22, 2024
2.7%
0 shares
The Baupost Group, L.L.C. 04-3402144
SC 13G/A · Jan 9, 2024
0.0%
0 shares
JPMORGAN CHASE & CO. 13-2624428
SC 13G/A · Dec 7, 2023
2.1%
2.2M shares
SC 13G · Nov 21, 2023
9.9%
10.1M shares
SC 13G/A · Feb 14, 2023
9.9%
9.8M shares
Maverick Capital, Ltd. – 75-2482446
SC 13G/A · Feb 14, 2023
6.6%
6.3M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G · Feb 3, 2023
8.1%
0 shares
SC 13G/A · Jan 24, 2023
9.6%
9.2M shares
JPMORGAN CHASE & CO. 13-2624428
SC 13G/A · Jan 18, 2023
7.9%
7.5M shares
Maverick Capital, Ltd. – 75-2482446
SC 13G/A · Mar 11, 2022
8.4%
7.9M shares
Maverick Capital, Ltd. – 75-2482446
SC 13G/A · Feb 14, 2022
8.9%
7.9M shares
SC 13G/A · Feb 14, 2022
9.9%
9.1M shares
JPMORGAN CHASE & CO. 13-2624428
SC 13G/A · Jan 7, 2022
8.3%
7.4M shares