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ISSUER PROFILE · CIK 0001604464 · CUSIP 046513206

Atara Biotherapeutics, Inc.ATRA

2 13D/G filings 2 distinct filers 0 insider transactions (365d)

Cross-Reference Snapshot

Activist filings
2
2 SCHEDULE 13D/A
Distinct filers
2
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
6.10
as of 2026-04-30

Institutional Consensus · 2025-12-31

Held by elite portfolio managers
1 holder · $331K
Point72 Asset Mgmt

13D/G Filings Timeline · 2 total

FiledFormFilerStakeSharesIntent
2026-05-14 SCHEDULE 13D/A Redmile Group, LLC 9.90% 950,994 view →
2026-05-11 SCHEDULE 13D/A Panacea Innovation Ltd 1,318,894 view →

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-04-30 306,093 6.10 -3.7%
2026-04-15 317,953 4.10 -2.8%
2026-03-31 327,066 3.01 +4.4%
2026-03-13 313,290 1.00 -5.2%
2026-02-27 330,524 2.13 +57.9%
2026-02-13 209,287 2.40 -25.9%
2026-01-30 282,525 1.00 -72.2%
2026-01-15 1,016,616 1.00 +500.8%
2025-12-31 169,201 2.56 +1.4%
2025-12-15 166,856 2.01 +1.3%

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