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ATRA insider trading

Atara Biotherapeutics, Inc. — open-market insider buys and $1M+ sells from SEC Forms 3, 4 and 5.
Insider buys · 24 mo
3
Bought · 24 mo
$5.6M
Buys · last 90 days
0 · $0
Most recent buy
2026-05-11

Recent insider filings

FiledInsiderTypeSharesPriceValue
2026-05-11EcoR1 Capital, LLC
10% owner
Bought507,407$9.35$4.7M
2026-05-11Huang James
Director · 10% owner
Sold313,446$10.10$3.2M
2025-08-19Huang James
Director · 10% owner
Bought55,000$12.19$670k
2025-07-21Huang James
Director · 10% owner
Bought19,335$9.64$186k

Most active insider buyers

InsiderRoleBuysTotal bought
EcoR1 Capital, LLC10% owner1$4.7M
Huang JamesDirector · 10% owner2$857k

See ATRA on the chart

Every insider buy and sell for ATRA plotted on the price, the full two-year history, cluster scores and daily updates — in the members area, $29/month. A free quarterly sample of the whole dataset needs no account.

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Data from the SEC EDGAR ownership filings, refreshed daily. Only open-market purchases (transaction code P) and sales of $1M or more are shown; grants, option exercises and tax withholding are excluded because they run on schedules set years earlier. Not investment advice.