How many insider trades does FilingIQ track for ATRA?

FilingIQ tracks 1,048 Form 4 insider transactions for ATRA (Atara Biotherapeutics, Inc.), covering filings from Oct 21, 2014 onwards. 15 of those were filed in the last 90 days.

Are ATRA insiders net buyers or net sellers?

Across the full Form 4 history for ATRA, 15 transactions (1%) were open-market purchases and 610 (58%) were open-market sales. Compensatory awards and option exercises are filtered out of these counts.

Where does ATRA insider data come from?

Every transaction shown on this page is sourced directly from SEC EDGAR Form 4 filings. FilingIQ parses the raw XML, normalises insider identity across reporting variations, and scores each trade on its multi-factor composite model.

What sector is ATRA in?

Atara Biotherapeutics, Inc. (ATRA) is classified in the Healthcare sector, specifically Biotechnology, with a current market capitalisation of $30.14M.

ATRA insider trading

NasdaqGS Healthcare

Atara Biotherapeutics, Inc. — scored insider trade history from SEC Form 4 filings, parsed and contextualised by FilingIQ.

Total Form 4 trades

1,048

Last 90 days

Buys / sells

1% / 58%

Market cap

$30.14M

About Atara Biotherapeutics, Inc.

Atara Biotherapeutics, Inc. engages in the development of transformative therapies for patients with cancer and autoimmune disease in the United States and the United Kingdom. Its lead product includes Tab-cel (tabelecleucel), a T-cell immunotherapy program that is in Phase 3 clinical trials for the treatment of epstein-barr virus (EBV) with post-transplant lymphoproliferative disease, as well as other EBV-driven diseases. The company has research collaboration agreements with Memorial Sloan Kettering Cancer Center, and Council of the Queensland Institute of Medical Research. Atara Biotherapeutics, Inc. was incorporated in 2012 and is headquartered in Thousand Oaks, California.

Company website: www.atarabio.com

ATRA insider activity at a glance

FilingIQ has scored 1,048 insider transactions for ATRA since Oct 21, 2014. The most recent filing in our index is dated May 7, 2026.

Across the full history, 15 open-market purchases and 610 open-market sales were filed under transaction codes P and S respectively. Compensatory share awards (code A) and option exercises (code M) are tracked separately and not counted here.

The average FilingIQ composite score on ATRA insider trades is 53.0/100, produced by FilingIQ's multi-factor Form 4 model. Model framework documented at methodology.

View live ATRA trades on FilingIQ Raw filings on SEC EDGAR

Latest ATRA Form 4 filings

Nguyen AnhCo President and CEO

S Mar 2, 2026

Most recent disclosures. Sign up to filter by score, transaction code, or insider role.

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Frequently asked

How many insider trades does FilingIQ track for ATRA?: FilingIQ tracks 1,048 Form 4 insider transactions for ATRA (Atara Biotherapeutics, Inc.), covering filings from Oct 21, 2014 onwards. 15 of those were filed in the last 90 days.
Are ATRA insiders net buyers or net sellers?: Across the full Form 4 history for ATRA, 15 transactions (1%) were open-market purchases and 610 (58%) were open-market sales. Compensatory awards and option exercises are filtered out of these counts.
Where does ATRA insider data come from?: Every transaction shown on this page is sourced directly from SEC EDGAR Form 4 filings. FilingIQ parses the raw XML, normalises insider identity across reporting variations, and scores each trade on its multi-factor composite model.
What sector is ATRA in?: Atara Biotherapeutics, Inc. (ATRA) is classified in the Healthcare sector, specifically Biotechnology, with a current market capitalisation of $30.14M.

Methodology & sources

Every ATRA insider transaction shown on FilingIQ is parsed directly from a public SEC Form 4 XML filing. Insider identity is normalised across reporting variants (CIK changes, name spellings, related-party indirect holdings). The FilingIQ composite score is documented in full on the team page and algo disclosure. Not investment advice; see disclaimer.