Atara Bio CEO Sells $38K in Stock for Tax Withholding
Atara Biotherapeutics, Inc.
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Filing Summary
Atara Bio CEO Sells $38K in Stock for Tax Withholding
Company: Atara Biotherapeutics, Inc. (ATRA) Form: 4 | Filed: 2025/11/19 Significance: Low
Insider: Nguyen AnhCo Title: President and CEO | Relationship: Director, Officer
Transaction: • Type: Sell • Shares: 2,915 • Price: ~$13.19 • Value: ~$38,440 • Owned After: 64,974
Key Insight: This was an automatic, non-discretionary sale to cover tax obligations from vesting RSUs, as noted in the filing. It does not reflect a change in the insider's outlook.
Market Context: The sale represents less than 0.04% of the company's $100 million market capitalization.
Comprehensive Analysis
SEC Filing Analysis: Atara Biotherapeutics, Inc. (ATRA)
Executive Summary
- Trading Significance: Low
- Key Takeaway: The President and CEO, Nguyen AnhCo, executed an automatic sale of shares to cover tax withholding obligations related to vesting Restricted Stock Units (RSUs).
- Market Impact: Neutral. This is a non-discretionary transaction with negligible market value.
Company Information
| Field | Value |
|---|---|
| Company | Atara Biotherapeutics, Inc. |
| Ticker Symbol | ATRA |
| CIK | 0001604464 |
| Industry | BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) |
Insider Information
| Field | Value |
|---|---|
| Name | Nguyen AnhCo |
| CIK | 0001977970 |
| Title/Position | President and CEO |
| Relationship | Director, Officer |
Transaction Details
| Field | Value |
|---|---|
| Form Type | 4 |
| Transaction Date | 2025-11-17 |
| Transaction Code | S (Sale) |
| Security Type | Common Stock |
| Shares Involved | 2,915 |
| Price Per Share | ~$13.19 (Weighted Avg) |
| Total Value | $38,440 |
| Shares Owned After | 64,974 |
| Ownership Type | Direct |
Financial Impact Assessment
Transaction Materiality
| Metric | Value |
|---|---|
| Transaction Value | $38,440 |
| % of Market Cap | 0.038% |
| Materiality Assessment | Low |
Impact Evaluation
- Market Cap Context: The transaction value of approximately $38,440 is insignificant relative to Atara's $100 million market capitalization.
- Transaction Significance: The sale is classified as having low significance due to its small value and its nature as an automatic 'sell-to-cover' transaction, which is common for executives managing tax liabilities on equity compensation.
Market Impact Analysis
Stock Impact Prediction
- Direction: Neutral
- Reasoning: The filing explicitly states the sale was automatic to satisfy tax withholding obligations. This is not a discretionary sale reflecting insider sentiment.
Volume & Sentiment
- Expected Volume Impact: Negligible. The transaction size is too small to impact trading volume.
- Sentiment Indicator: Neutral. The market typically disregards routine, tax-related sales by insiders.
Additional Context
Transaction Notes
- Special Circumstances: Footnote 1 confirms: "Shares sold automatically to satisfy tax withholding obligations in connection with the vesting of previously granted restricted stock units, pursuant to a sale-to-cover provision in the award agreement."
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Important Disclaimer
This content is drawn from public SEC filings and may contain errors. It is for informational purposes only and is not investment, legal, or tax advice.
Nothing here is a recommendation to buy, sell, or hold any security. Do your own due diligence.