ATRA Atara Biotherapeutics, Inc.
NEUTRAL
Impact: 2/10
Insider Cluster (2 insiders)
Insider cluster: 2 insiders, $1K total
Final — all horizons settled through T+60d
ATRA ▲ +95.72% at T+60d
NEUTRAL call ✓ call won +95.72% · α vs SPY +86.40% · entry $4.91 → $9.61
Currently $10.41 · +112.02% from $4.91 entry
T+1d
+10.39%
call +10.39% · α +11.30%
$5.42
settled 3mo ago
T+5d
+36.05%
call +36.05% · α +37.26%
$6.68
settled 3mo ago
T+20d
-12.02%
call -12.02% · α -4.08%
$4.32
settled 3mo ago
T+60d
+95.72%
call +95.72% · α +86.40%
$9.61
settled 18d ago
Price Chart
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Executive Summary
Two insiders at Atara Biotherapeutics sold shares in the past week, including CEO AnhCo Nguyen who sold 198 shares for $1,005.64. The total value of the cluster is minimal at $1,127.49, representing less than 0.01% of the company's $39M market cap.
Key Financial Metrics
Direction
selling
Total Value
$1.1K
Insiders
2
Actionable Insight
The selling is de minimis in dollar value and likely reflects personal financial planning rather than negative sentiment. No actionable signal for traders.
Key Facts
- CEO AnhCo Nguyen sold 198 shares at $5.079, generating $1,005.64 in proceeds.
- Chief Accounting Officer Grant-Huerta Yanina sold 24 shares at $5.077, totaling $121.85.
- Both transactions were open-market sales (Form 4 codes S).
- Total dollar volume of insider selling in the past 7 days: $1,127.49.
- This represents less than 0.01% of ATRA's $39M market capitalization.
Financial Impact
$1,127 in total open-market sales by insiders
insider ownershipmarket sentiment
Risk Factors
- Minimal risk — transaction values are trivial relative to company size.
- Potential perception risk if small-cap investors overinterpret minor insider activity.
Market Snapshot
Exchange
Nasdaq
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CONTEXT: Insider Cluster Data (2 trades, 7d window) | cluster-ATRA-1772659814380 |
7 reports for ATRA
Filters
Rows
| Type | Now | ||||
|---|---|---|---|---|---|
|
May 7, 2026
5w ago
|
8-K
| $9.93 $9.63 | ▼ −3.02% | ▼ −6.16% | $10.41 (+4.83%) |
|
May 7, 2026
5w ago
|
Insider Cluster
| $9.93 $9.63 | ▼ −3.02% | ▼ −6.16% | $10.41 (+4.83%) |
|
Apr 24, 2026
7w ago
|
DEFA14A
| $4.99 $9.61 | ▲ +92.59% | ▲ +87.63% | $10.41 (+108.62%) |
|
Mar 17, 2026
12w ago
|
S-3
| $5.00 $5.24 | ▲ +4.80% | ▼ −1.25% | $10.41 (+108.20%) |
|
Mar 12, 2026
13w ago
|
8-K
| $6.90 $4.65 | ▼ −32.61% | ▼ −34.58% | $10.41 (+50.87%) |
|
Mar 3, 2026
14w ago
|
8-K
| $5.42 $4.73 | ▼ −12.73% | ▼ −8.33% | $10.41 (+92.07%) |
|
Mar 2, 2026
14w ago
|
Insider Cluster
| $4.91 $4.32 | ▼ −12.02% | ▼ −4.08% | $10.41 (+112.02%) |
Showing 7 of 7
US Market Status
Market Closed — Opens Mon (48h 13m)
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