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ATARA BIOTHERAPEUTICS INC (ATRA) Stock Ownership and Short Interest

USA - NASDAQ:ATRA - US0465132068 - Common Stock

15.21 USD
-0.38 (-2.44%)
Last: 10/28/2025, 4:10:09 PM
ATRA Ownership Chart.ATRA Ownership Chart: showing Insider, Institutional ownership and shares available to the public.ATRA Ownership.InsiderInstitutionalPublic



Shares Outstanding7.02M
Float5.53M
Float Short Interest Percentage2.33%
Owners (insider)1.77%
Owners (institutional)45.73%
Owners (insider) change1.59%
Owners (institutional) change0%
ATRA Institutional Ownership HistoryATRA Institutional Ownership HistoryATRA Institutional Ownership History Sep 2021 Mar 2022 Sep 2022 Mar 2023 Sep 2023 Mar 2024 Sep 2024 Mar 2025 Sep 2025 20M 40M 60M 80M 100M
ATRA Historical Insider Transactions ChartATRA Historical Insider Buy and Sell Transactions ChartATRA Historical Insider Transactions Nov 2024 Dec 2024 Jan 2025 Feb 2025 Mar 2025 Apr 2025 May 2025 Jun 2025 Jul 2025 Aug 2025 Sep 2025 Oct 2025 0 50K 100K 150K 200K
Date Name Type Shares Price Amount
Aug 18, 2025 Grant-Huerta Yanina Open Market Sale 1809 11.61 $ 21,009.37
Aug 18, 2025 Nguyen AnhCo Open Market Sale 2958 11.62 $ 34,360.30
Aug 15, 2025 Panacea Innovation Ltd Open Market Purchase 55000 12.19 $ 670,422.50
Aug 15, 2025 Huang James Open Market Purchase 55000 12.19 $ 670,422.50
Jul 17, 2025 Panacea Innovation Ltd Open Market Purchase 19335 9.64 $ 186,372.00
Jul 17, 2025 Huang James Open Market Purchase 19335 9.64 $ 186,372.00
Jun 10, 2025 HEIDEN WILLIAM K Grant 7828 0.00 $ 0.00
Jun 10, 2025 Gallagher Carol Giltner Grant 7828 0.00 $ 0.00
Jun 10, 2025 Fust Matthew K Grant 7828 0.00 $ 0.00
Jun 10, 2025 Touchon Pascal Grant 7828 0.00 $ 0.00
Jun 10, 2025 Roncarolo Maria Grazia Grant 7828 0.00 $ 0.00
Jun 10, 2025 MALLIK AMEET Grant 7828 0.00 $ 0.00
May 16, 2025 Adiumentum Capital Fund I LP Grant 75572 6.61 $ 499,530.92
May 16, 2025 Adiumentum Capital Fund I GP LLC Grant 75572 6.61 $ 499,530.92
May 16, 2025 Ciongoli Gregory Austin Grant 75572 6.61 $ 499,530.92
May 16, 2025 Grant-Huerta Yanina Open Market Sale 2218 6.76 $ 15,000.33
May 16, 2025 Nguyen AnhCo Open Market Sale 3276 6.76 $ 22,155.59
Mar 3, 2025 Nguyen AnhCo Open Market Sale 3331 7.00 $ 23,307.01
Mar 3, 2025 Hyllengren Eric J Open Market Sale 1211 7.00 $ 8,473.37
Mar 3, 2025 Henrich Jill Open Market Sale 1059 7.00 $ 7,409.82
Jan 27, 2025 Hyllengren Eric J Grant 34050 0.00 $ 0.00
Nov 18, 2024 Henrich Jill Open Market Sale 1000 11.20 $ 11,198.00
Nov 18, 2024 Hyllengren Eric J Open Market Sale 1364 11.20 $ 15,274.07
Nov 18, 2024 Nguyen AnhCo Open Market Sale 1664 11.20 $ 18,633.47