ATRA
−$19.4K
1,668 sh @ $12
ATRA
Atara Biotherapeutics, Inc.
SEC CIK 1604464
$10.41
+114.2% · 90 days
90-day buys
$4.74M
1 open-market
90-day sells
$3.23M
3 open-market
Net insider flow
+$1.51M
Net buying
Filings shown
39
Most recent
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At a glance
Over the last 90 days, insiders at ATRA have bought a net $1.51M of stock (1 open-market buy vs 3 sells).
Largest recent trade: Ecor1 Capital, Llc, ATRA's 10% owner, spent $4.74M of their own money on 507,407 shares at $9, growing their stake 49%.
Most active filer: Grant-huerta Yanina, with 12 transactions among the recent filings shown.
Insider transaction history
Form 4 filings for ATRA, newest firstATRA
Panacea Innovation Ltd, ATRA's 10% owner, spent $670.4K of their own money on 55,000 shares at $12, growing their stake 4%.
+$670.4K
55,000 sh @ $12
ATRA
Panacea Innovation Ltd, ATRA's 10% owner, spent $186.4K of their own money on 19,335 shares at $10, growing their stake 1%.
+$186.4K
19,335 sh @ $10
ATRA
+$0
7,828 sh
ATRA
+$0
7,828 sh
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ATRA
+$0
7,828 sh
ATRA
+$0
7,828 sh
ATRA
+$0
7,828 sh
ATRA
+$0
7,828 sh
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About ATRA insider activity
This page tracks every recent Form 4 filed for Atara Biotherapeutics, Inc. with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.
The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.
Frequently asked questions
How often is ATRA insider data updated?
Continuously. We read from SEC EDGAR, so new Form 4 filings for Atara Biotherapeutics, Inc. usually appear here within minutes of being accepted by the SEC.
What does "net insider flow" mean?
It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.
Why do some rows show grants or option exercises instead of buys?
Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.
Is this investment advice?
No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.