What this shows
Market trades first
This view focuses on purchases and sales with reported trade value. Lower-signal rows are moved out of the first screen, not hidden.
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ATRA Insider Trading Activity
Track Atara Biotherapeutics, Inc. (ATRA) insider transactions, SEC Form 4 filings, insider buys, insider sales, filing dates, trade values, and source links. Recent summary: 38 trades, 2 buys, and 28 sales. Learn more
Feed status Last SEC check:Loading Last Filing: Loading
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Why it matters
Use it as the default scan
Start here when you want the newest activity that most retail investors expect from an insider trading feed.
How to read it
Open the full ledger when needed
Use All Form 4 Filings when you want grants, exercises, gifts, conversions, and every normalized row.
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Key insider views at a glance
Filings
ATRA Form 4 filing history
Status Loading
Latest visible filing loading.
Public Form 4 filings, normalized for cleaner scanning. What do these codes mean?
| Ticker | Type & Role | Value | |
|---|---|---|---|
Sell CEO | $40.9K | ||
Sell 10% Owner | $3.2M | ||
Tax Withholding Director | $26 | ||
Exercise and Hold Director | $26 | ||
Exercise and Hold Director | $1.7M | ||
Tax Withholding 10% Owner | $26 | ||
Exercise and Hold 10% Owner | $1.7M | ||
Exercise and Hold 10% Owner | $26 | ||
Grant CEO | $0 | ||
Grant Officer | $0 | ||
Cluster detail
Cluster members
Ticker context
Ticker summary
Recent insider activity for this company.
Insider detail
Insider activity
Recent transactions grouped by reporting owner.
Filters
Filters
Latest news
ATRA headlines
- Biotech Stocks Surge As UniQure 'Nail-Biting Journey' Comes To An End · Jun 17, 2026
- ATRA Stock Shoots Up 82% in a Month: Here's What You Should Know · May 21, 2026
- FDA Resubmission Path for Tab-cel Keeps Atara’s (ATRA) Regulatory Timeline Alive · May 7, 2026
- Atara Biotherapeutics, Inc. (ATRA) Registers Possible Resale of 400K Common Shares Tied to HCR Warrant Exercise · Apr 3, 2026
- Atara Biotherapeutics: Q4 Earnings Snapshot · Mar 16, 2026
Plain-English summary
ATRA insider activity summary
Atara Biotherapeutics, Inc. (ATRA) insider activity over the recent reporting window includes 2 insider purchases totaling approximately $857K and 28 insider sales totaling approximately $4.4M. Market data shows a current price of $9.38 and a market capitalization of $40.5M. Blue Collar Picks normalizes public SEC Form 4 filings into a research-friendly view organized by ticker, insider role, transaction type, filing date, and reported value. ATRA pages are designed as a research starting point, not investment advice. Verify the original SEC filing, read the transaction code, compare the trade against the insider's role and history, and consider whether the activity is an open-market purchase, a sale, a grant, an option exercise, or another lower-signal filing type before drawing conclusions.
Company snapshot
Atara Biotherapeutics, Inc. at a glance
Context
Earnings & analyst view
Earnings
Nov 10, 2026
Last reported Aug 10, 2026.
Analyst View
$9.33 +96.08% upside
Target range $4.00–$18.00.
Ownership context
Top institutional holders
| Holder | Shares | % Held | Value | Reported |
|---|---|---|---|---|
| EcoR1 Capital, LLC | 573,183 | 0.07% | $2.7M | Dec 31, 2025 |
| Redmile Group, LLC | 441,701 | 0.05% | $2.1M | Dec 31, 2025 |
| Vanguard Group Inc | 225,940 | 0.03% | $1.1M | Dec 31, 2025 |
| Marshall Wace LLP | 148,632 | 0.02% | $707K | Dec 31, 2025 |
| Globeflex Capital L P | 77,224 | 0.01% | $368K | Dec 31, 2025 |
Primary source
Verify with the original SEC filings
Blue Collar Picks normalizes public Form 4 records but the SEC filing is the source of record. Use the original filing before making any investment decision.
Open ATRA Form 4 filings on SEC EDGAR → See insider trading stocks ranked by activity → Read the Blue Collar Picks methodology → Read the investment disclaimer →
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Method Public Form 4 filings, normalized for cleaner scanning. Filtered rows stay available in All Form 4 Filings and ticker history. Which view should I use? →
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