ATRA · Insider trading · 13F holders · Congress trades
Atara Biotherapeutics, Inc. (ATRA)
Who is buying and selling ATRA: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 2
- Insider buys, 90 days
- $1000K
- Insider sales, 90 days
- $41K
- Congress trades, 12 months
- 0
ATRA at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 2 ATRA insiders filed 1 open-market purchase worth $1000K and 1 sale worth $41K on SEC Form 4.
- 2 13F filers hold ATRA among their 50 largest positions, worth $22.9M combined, including Oleg Nodelman. The biggest bets by portfolio weight are Oleg Nodelman (0.9%) and Redmile Group, LLC (0.3%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
- No member of Congress has disclosed a trade in ATRA.
- ATRA last closed at $8.53 on Oct 29, 2026.
ATRA insider trading
Between Aug 1, 2026 and Oct 29, 2026, 2 ATRA insiders filed 1 open-market purchase worth $1000K and 1 sale worth $41K on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Cherry Brian N | Director | Buy | 104,166 | $9.60 | $1000K | SEC |
| Aug 26, 2026 | Nguyen AnhCo | President and CEO, Director | Sale | 5,062 | $8.08 | $41K | SEC |
Who owns ATRA? Hedge funds and superinvestors
2 13F filers hold ATRA among their 50 largest positions, worth $22.9M combined, including Oleg Nodelman. The biggest bets by portfolio weight are Oleg Nodelman (0.9%) and Redmile Group, LLC (0.3%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
Superinvestors holding ATRA: Oleg Nodelman 0.9%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Oleg NodelmanHedge fund | 0.9% | $17.8M | 1,552,000 | +1458.3% shares | Q2 2026 |
| Redmile Group, LLCHedge fund | 0.3% | $5.1M | 441,701 | +0.0% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 2). Screen ATRA in the grand portfolio →
ATRA stock trades by members of Congress
No member of Congress has disclosed a trade in ATRA.
ATRA questions and answers
Are insiders buying ATRA stock?
Between Aug 1, 2026 and Oct 29, 2026, 2 ATRA insiders filed 1 open-market purchase worth $1000K and 1 sale worth $41K on SEC Form 4.
Which hedge funds own ATRA?
2 13F filers hold ATRA among their 50 largest positions, worth $22.9M combined, including Oleg Nodelman. The biggest bets by portfolio weight are Oleg Nodelman (0.9%) and Redmile Group, LLC (0.3%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
Has Congress traded ATRA?
No member of Congress has disclosed a trade in ATRA.
Who is the largest holder of ATRA?
Among 13F filers, Oleg Nodelman reports the largest ATRA position, $17.8M (1,552,000 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Oleg Nodelman's: 0.9% of its portfolio.
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