Atara Biotherapeutics, Inc. (ATRA) insider buying and selling
In the last 90 days at Atara Biotherapeutics, Inc. (ATRA), 1 insider made 1 open-market purchase worth $1000K and 1 insider made 1 open-market sale worth $41K, as reported on SEC Form 4. The sale was scheduled in advance or made to cover tax on vesting shares, so they say less about the insider's view of the stock. Over the last 12 months, 1 insider bought $1000K of the stock, led by Brian N Cherry (Director), who bought $1000K on Sep 4, 2026; 1 insider sold $41K, of which $41K was scheduled or tax-related.
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Trades by the same insider within a week are shown as one line.
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| Brian N Cherry Director | Open market purchase | 104,166 | $9.60 | $1000K |
Scheduled and tax-related sales
Sales made under a pre-arranged 10b5-1 plan or to cover tax on vesting shares. They are listed separately because they are not a fresh decision to sell.
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| AnhCo Nguyen CEO | Sell to cover | 5,062 | $8.08 | $41K |
What the ATRA insider trades really mean
The table above is the public summary. With an Insider Intel account you get the analysis behind it, for Atara Biotherapeutics, Inc. and every other stock we track:
ATRA's AI Signal score
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Questions about ATRA insider trading
Who bought Atara Biotherapeutics, Inc. (ATRA) stock recently?
Insiders who bought Atara Biotherapeutics, Inc. stock on the open market in the last 12 months: Brian N Cherry ($1000K). The most recent purchase was reported on Sep 4, 2026.
Are insiders buying or selling ATRA?
Over the last 12 months insiders were net buyers of ATRA on discretionary trades: $1000K bought against $0 sold (scheduled and tax-related sales excluded).
What is a sell-to-cover or 10b5-1 sale?
A 10b5-1 sale is scheduled in advance under a pre-arranged plan, and a sell-to-cover sale is made to pay tax on vesting shares. Neither is a fresh decision to sell, so they say less about an insider's view than a discretionary sale.
Where does this data come from?
Officers, directors and large shareholders report their trades to the SEC on Form 4. This page lists the open-market purchases and sales by individual insiders from those public filings; funds and other institutions are not shown.
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How to read this page
Officers, directors and large shareholders must report their trades in company shares to the SEC on Form 4. This page lists open-market purchases and sales by individual insiders: trades made on the stock exchange at the going price. Funds and other institutions are not shown here.
Information from SEC EDGAR Form 4 filings, shown for general information only. It is not financial advice and does not recommend buying or selling any security. Trades are shown by transaction date and may be reported up to two business days later.