ATRA insider buying – Atara Biotherapeutics, Inc.
11 insider purchases since 2016 worth $7.5M by 9 different insiders. Last 12 months: 2 purchases, $5.7M. Most recent filing: 2026-09-04.
Small company Public float $39M (latest 10-K, SEC). Share prices of small companies usually swing much more than those of large ones, in both directions, and are easier to move with little trading.
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits. 3 older purchases (before the 5-year window) are listed in the table below.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC 10% Owner | $4.7M 1× · 507,407 sh | 2026-05-07 2026-05-07 | – | 1,552,000 shares as of 2026-05-11 | Holds - never sold |
| Cherry Brian N Director | $999,994 1× · 104,166 sh | 2026-09-04 2026-09-04 | – | 166,486 shares as of 2026-09-04 | Holds - never sold |
| Panacea Innovation Ltd Director | $670,450 1× · 55,000 sh | 2025-08-15 2025-08-15 | 1× · $3.2M last 2026-05-07 | 1,318,894 shares as of 2026-05-11 | Sold part |
| Yarema Kristin Officer | $500,370 1× · 34,354 sh | 2021-06-11 2021-06-11 | – | 171,415 shares as of 2022-03-03 | Holds - never sold |
| Huang James Director | $186,389 1× · 19,335 sh | 2025-07-17 2025-07-17 | 1× · $488,963 last 2026-01-12 | 1,324,446 shares as of 2026-01-14 | Sold part |
| DOBMEIER ERIC Director | $183,350 3× · 451,825 sh | 2016-03-17 2023-11-10 | – | 563,325 shares as of 2023-11-14 | Holds - never sold |
| Koppikar Utpal CFO | $73,600 1× · 2,000 sh | 2018-07-27 2018-07-27 | 3× · $197,016 last 2021-11-16 | 181,978 shares as of 2023-03-06 | Sold part |
| Gallagher Carol Giltner Director | $67,588 1× · 270,000 sh | 2023-11-13 2023-11-13 | 3× · $944,540 last 2018-11-07 | 33,012 shares as of 2025-06-12 | Holds (sold earlier) |
| HEIDEN WILLIAM K Director | $25,000 1× · 100,000 sh | 2023-11-10 2023-11-10 | – | 34,188 shares as of 2026-06-11 | Holds - never sold |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2026 | 2 | $5.7M | 2 | 2 | $3.7M |
| 2025 | 2 | $856,839 | 2 | – | – |
| 2024 | 0 | – | – | 1 | $50,534 |
| 2023 | 3 | $195,358 | 3 | 3 | $168,402 |
| 2022 | 0 | – | – | 7 | $568,121 |
| 2021 | 1 | $500,370 | 1 | 21 | $2.3M |
| 2020 | 0 | – | – | 6 | $667,062 |
| 2019 | 1 | $39,000 | 1 | 20 | $7.2M |
| 2018 | 1 | $73,600 | 1 | 54 | $31.0M |
| 2017 | 0 | – | – | 44 | $5.7M |
| 2016 | 1 | $41,580 | 1 | 28 | $3.9M |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-04 | Cherry Brian N | Director | 104,166 | $9.60 | $999,994 | +167.1% | SEC |
| 2026-05-11 | EcoR1 Capital, LLC | 10% Owner | 507,407 | $9.35 | $4.7M | +48.6% | SEC |
| 2025-08-19 | Panacea Innovation Ltd | Director | 55,000 | $12.19 | $670,450 | +4.1% | SEC |
| 2025-07-21 | Huang James | Director | 19,335 | $9.64 | $186,389 | +1.5% | SEC |
| 2023-11-15 | Gallagher Carol Giltner | Director | 270,000 | $0.25 | $67,588 | +142.5% | SEC |
| 2023-11-14 | HEIDEN WILLIAM K | Director | 100,000 | $0.25 | $25,000 | +91.7% | SEC |
| 2023-11-14 | DOBMEIER ERIC | Director | 446,825 | $0.23 | $102,770 | +383.5% | SEC |
| 2021-06-15 | Yarema Kristin | Officer | 34,354 | $14.57 | $500,370 | +37.5% | SEC |
| 2019-07-01 | DOBMEIER ERIC | Director | 2,000 | $19.50 | $39,000 | +14.3% | SEC |
| 2018-09-11 | Koppikar Utpal | CFO | 2,000 | $36.80 | $73,600 | +4.4% | SEC |
| 2016-03-17 | DOBMEIER ERIC | Director | 3,000 | $13.86 | $41,580 | +120.0% | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2026-05-11 | Panacea Innovation Ltd | Director | 313,446 | $10.10 | $3.2M | Sale | SEC |
| 2026-01-14 | Huang James | Director | 80,554 | $6.07 | $488,963 | Sale | SEC |
| 2024-05-20 | Touchon Pascal | CEO | 81,506 | $0.62 | $50,534 | Sale | SEC |
| 2023-08-18 | Touchon Pascal | CEO | 30,766 | $1.65 | $50,764 | Sale | SEC |
| 2023-05-18 | Touchon Pascal | CEO | 29,766 | $2.04 | $60,723 | Sale | SEC |
| 2023-03-06 | Touchon Pascal | CEO | 15,679 | $3.63 | $56,915 | Sale | SEC |
| 2022-11-18 | Touchon Pascal | CEO | 15,591 | $4.49 | $70,004 | Sale | SEC |
| 2022-08-18 | Touchon Pascal | CEO | 14,806 | $5.04 | $74,622 | Sale | SEC |
| 2022-06-29 | Touchon Pascal | CEO | 14,220 | $7.20 | $102,384 | Sale | SEC |
| 2022-05-19 | Touchon Pascal | CEO | 13,913 | $5.32 | $74,017 | Sale | SEC |
| 2022-03-03 | Touchon Pascal | CEO | 8,828 | $9.86 | $87,044 | Sale | SEC |
| 2022-02-14 | Dupont Jakob | Officer | 5,000 | $16.00 | $80,000 | Sale | SEC |
| 2022-01-05 | Dupont Jakob | Officer | 5,000 | $16.01 | $80,050 | Sale | SEC |
| 2021-12-03 | Dupont Jakob | Officer | 5,000 | $17.94 | $89,700 | Sale | SEC |
| 2021-11-18 | Touchon Pascal | CEO | 8,402 | $17.12 | $143,842 | Sale | SEC |
Showing the latest 15 of 186 sales of $50,000+ since 2016.
Recent company events (SEC 8-K)
- 2026-11-10 - Quarterly results released (SEC)
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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