SEC Insider Transactions from Nguyen AnhCo.

Last updated: 2026-03-14 11:57 UTC | Total transactions: 23

Nguyen AnhCo, President and CEO of Atara Biotherapeutics, Inc. ($ATRA), sold common shares on the open market 10 times over the past year, totaling about $110,000. His most recent sale occurred on March 2, 2026. These sales rank 9,424th among 11,678 individual insiders, far below the average sale value of $8.6 million and 6.4 transactions per insider. Nguyen AnhCo made no open market purchases in the last 365 days.

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Transaction Date Company Ticker Insider Name Title Transaction Type Security Shares Price Shares Owned Following Total Shares Outstanding % of Owned % of Outstanding
March 9, 2026 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO A Common Stock 81100 $0.00 143,078.0000 13,564,000 130.85% 0.60%
March 2, 2026 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 198 $5.08 64,776.0000 13,564,000 0.30% 0.00%
March 2, 2026 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 1442 $5.09 61,978.0000 13,564,000 2.27% 0.01%
March 2, 2026 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 1298 $5.09 63,420.0000 13,564,000 2.01% 0.01%
March 2, 2026 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 58 $5.08 64,718.0000 13,564,000 0.09% 0.00%
Nov. 17, 2025 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 56 $13.19 64,974.0000 13,564,000 0.09% 0.00%
Nov. 17, 2025 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 2859 $13.19 65,030.0000 13,564,000 4.21% 0.02%
Aug. 18, 2025 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 57 $11.61 70,790.0000 7,488,000 0.08% 0.00%
Aug. 18, 2025 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 1281 $11.62 69,509.0000 7,488,000 1.81% 0.02%
Aug. 18, 2025 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 1620 $11.62 67,889.0000 7,488,000 2.33% 0.02%
May 16, 2025 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 3276 $6.76 70,847.0000 7,488,000 4.42% 0.04%
March 3, 2025 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 3331 $7.00 74,123.0000 7,488,000 4.30% 0.04%
Nov. 18, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO S Common Stock 1664 $11.20 77,454.0000 7,466,000 2.10% 0.02%
Sept. 9, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo President and CEO A Common Stock 45000 $0.00 79,118.0000 4,236,000 131.90% 1.06%
Aug. 16, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 56 $6.63 34,118.0000 4,236,000 0.16% 0.00%
Aug. 16, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 1468 $6.63 34,471.0000 4,236,000 4.08% 0.03%
Aug. 16, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 297 $6.63 34,174.0000 4,236,000 0.86% 0.01%
May 16, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 42899 $0.62 898,498.0000 4,236,000 4.56% 1.01%
March 4, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 10746 $0.72 941,397.0000 4,236,000 1.13% 0.25%
Jan. 8, 2024 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer A Common Stock 675000 $0.00 952,143.0000 4,236,000 243.56% 15.94%
Nov. 16, 2023 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 8856 $0.39 277,143.0000 0 3.10% 0.00%
Aug. 16, 2023 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 9277 $1.65 285,999.0000 0 3.14% 0.00%
Aug. 16, 2023 Atara Biotherapeutics, Inc. $ATRA Nguyen AnhCo EVP, Chief Sci. & Tech Officer S Common Stock 5849 $1.65 295,276.0000 0 1.94% 0.00%