EcoR1 Capital, LLC 3
3 · Atara Biotherapeutics, Inc. · Filed May 11, 2026
Insider Transaction Report
Form 3
EcoR1 Capital, LLC
10% Owner
Holdings
- 1,044,593(indirect: See Note)
Common Stock
[F2][F1]
Footnotes (2)
- [F1]The reporting persons are EcoR1 Capital, LLC ("EcoR1"), EcoR1 Capital Fund Qualified L.P. ("Qualified Fund") and Oleg Nodelman. EcoR1 is the general partner and investment adviser of private funds, including Qualified Fund (the "Funds"). Mr. Nodelman is the manager and controlling owner of EcoR1. EcoR1 is filing this Form 3 for itself, Mr. Nodelman and Qualified Fund. The reporting persons are filing this Form 3 jointly, but not as a group, and each expressly disclaims membership in a group within the meaning of Rule 13d-5(b) under the Securities Exchange Act of 1934. The Funds hold these securities directly for the benefit of their investors. EcoR1 may be deemed to indirectly beneficially own them as the investment adviser to the Funds. Mr. Nodelman may be deemed to indirectly beneficially own them as the control person of EcoR1. The reporting persons disclaim beneficial ownership of such securities except to the extent of their respective pecuniary interests therein.
- [F2]Qualified Fund beneficially owns 970,829 shares of Common Stock.
Signature
/s/ Oleg Nodelman, Manager of EcoR1 Capital, LLC|2026-05-11