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AN

Anhco Nguyen

ATRA
PRESIDENT AND CEO · ATARA BIOTHERAPEUTICS, INC. · CIK 0001977970
FILING MIX · LIFETIME13%/87%
BUYS
3
SELLS
21
TOTAL VALUE
$274.7K
COMPANIES
1
ACTIVE SINCE
Aug 2023
HOLDINGS NOW
137,837
AVG SELL PX
$2.70
TRADE KIND
SHOWING 24 / 24
Trades · vs SPY
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Performance · forward returns vs SPY
20 backtested trades · 8 horizons · 28 pending
Forward-return performance of every backtestable P/S trade by Anhco Nguyen, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d20+20.00%+9.26%-0.15%+9.41%+6.69%—
14d20+20.00%+7.44%+0.14%+7.30%+7.34%—
30d20+30.00%+7.02%+0.26%+6.77%+9.83%—
60d20+55.00%+0.78%+3.40%-2.62%-5.20%—
90d20+35.00%+25.20%+4.65%-1.66%+10.63%—
180d20(4 pending)+62.50%-13.23%+10.51%-23.75%-38.38%—
1y20(9 pending)+54.55%-2.02%+20.10%-22.12%-31.96%—
2y20(15 pending)+80.00%-47.01%+45.98%-92.99%-107.14%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
ATRA · 137,837 shares · as of May 18, 2026
0238,036476,072714,107952,143202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 3 buys / 21 sellsCOVERAGE · 12 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
5,241$9.13$47.8K137,837May 18, 2026May 20, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
81,100——143,078Mar 9, 2026Mar 11, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
198$5.08$1.0K64,776Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
1,442$5.09$7.3K61,978Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
58$5.08$29564,718Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
1,298$5.09$6.6K63,420Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
56$13.19$73964,974Nov 17, 2025Nov 19, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
2,859$13.19$37.7K65,030Nov 17, 2025Nov 19, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
1,281$11.62$14.9K69,509Aug 18, 2025Aug 20, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
1,620$11.62$18.8K67,889Aug 18, 2025Aug 20, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
57$11.61$66270,790Aug 18, 2025Aug 20, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
3,276$6.76$22.2K70,847May 16, 2025May 20, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
3,331$7.00$23.3K74,123Mar 3, 2025Mar 5, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
President and CEO
1,664$11.20$18.6K77,454Nov 18, 2024Nov 20, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
45,000——79,118Sep 9, 2024Sep 11, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
56$6.63$37134,118Aug 16, 2024Aug 20, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
297$6.63$2.0K34,174Aug 16, 2024Aug 20, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
1,468$6.63$9.7K34,471Aug 16, 2024Aug 20, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
42,899$0.62$26.5K898,498May 16, 2024May 20, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
10,746$0.72$7.7K941,397Mar 4, 2024Mar 6, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
675,000——952,143Jan 8, 2024Jan 9, 2024 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
8,856$0.39$3.4K277,143Nov 16, 2023Nov 20, 2023 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
9,277$1.65$15.3K285,999Aug 16, 2023Aug 18, 2023 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
EVP, Chief Sci. & Tech Officer
5,849$1.65$9.7K295,276Aug 16, 2023Aug 18, 2023 ↗View →
Other insiders · ATRA
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About this filer
CIK 0001977970
ROLE
President and CEO
PRIMARY
ATRA
COMPANIES
1
ACTIVE SINCE
Aug 2023
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