DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger
ATRA
ATARA BIOTHERAPEUTICS INC
37 institutions still hold ATARA BIOTHERAPEUTICS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.
CUSIP 046513206·37 13F holders·last filed Mar 31, 2026
AI Holders Summary · Q1 2026
37 institutions reported ATRA in Q1 2026. ADAGE CAPITAL PARTNERS GP, L.L.C. leads at 22.4% of the visible book. -42 net institutions QoQ — distribution reading.
Top holders
Sorted by position value. Source: SEC EDGAR 13F-HR filings.
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