13F Insight
DOSSIER · 13F Holders · Q2 2025

ATARA BIOTHERAPEUTICS INC

1 institutions still hold ATARA BIOTHERAPEUTICS INC as of Q2 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 046513956·1 13F holders·last filed Jun 30, 2025
Market cap
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13F value held
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visible holders
Holders
1
filers reporting
Concentration
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CONCOURSE FINANCIAL GROUP SECURITIES, INC. #1
top holder share
AI Holders Summary · Q2 2025

1 institutions reported ATARA BIOTHERAPEUTICS INC in Q2 2025. Top-holder concentration data is loading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025