ATRA Atara Biotherapeutics, Inc.
NEUTRAL
Impact: 2/10
Insider Cluster (2 insiders)
Insider cluster: 2 insiders, $1K total
Latest settled — T+20d
ATRA ▼ -12.02% at T+20d
NEUTRAL call ✗ call lost -12.02% · α vs SPY -4.08% · entry $4.91 → $4.32
Currently $9.45 · +92.46% 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 8w ago
T+60d
—
call — · α —
—
in 6d
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
13d ago
|
8-K
| $9.93 $10.48 | ▲ +5.54% | ▲ +4.03% | $9.45 (−4.83%) |
|
May 7, 2026
13d ago
|
Insider Cluster
| $9.93 $10.48 | ▲ +5.54% | ▲ +4.03% | $9.45 (−4.83%) |
|
Apr 24, 2026
26d ago
|
DEFA14A
| $4.99 $4.88 | ▼ −2.20% | ▼ −2.60% | $9.45 (+89.38%) |
|
Mar 17, 2026
9w ago
|
S-3
| $5.00 $4.96 | ▼ −0.80% | ▼ −0.09% | $9.45 (+89.00%) |
|
Mar 12, 2026
9w ago
|
8-K
| $6.90 $5.12 | ▼ −25.80% | ▼ −24.82% | $9.45 (+36.96%) |
|
Mar 3, 2026
11w ago
|
8-K
| $5.42 $6.29 | ▲ +16.05% | ▲ +16.53% | $9.45 (+74.35%) |
|
Mar 2, 2026
11w ago
|
Insider Cluster
| $4.91 $6.68 | ▲ +36.05% | ▲ +37.26% | $9.45 (+92.46%) |
Showing 7 of 7
US Market Status
Market Closed — Opens Thu (< 1m)
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