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YG

Yanina Grant-huerta

ATRA
CHIEF ACCOUNTING OFFICER · ATARA BIOTHERAPEUTICS, INC. · CIK 0002064348
FILING MIX · LIFETIME8%/92%
BUYS
1
SELLS
12
TOTAL VALUE
$92.5K
COMPANIES
1
ACTIVE SINCE
May 2025
HOLDINGS NOW
49,636
AVG SELL PX
$8.94
TRADE KIND
SHOWING 13 / 13
Trades · vs SPY
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Performance · forward returns vs SPY
11 backtested trades · 8 horizons · 25 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Yanina Grant-huerta, 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
7d11+0.00%+17.25%-0.57%+17.82%+6.75%—
14d11+0.00%+11.35%-0.52%+11.87%+7.96%—
30d11+0.00%+12.99%-0.61%+13.61%+9.83%—
60d11+63.64%-6.75%+4.20%-10.96%-5.20%—
90d11+27.27%+33.80%+3.75%-15.80%+10.63%—
180d11(4 pending)+85.71%-26.00%+9.64%-35.64%-38.38%—
1y11(10 pending)+0.00%+40.06%+24.93%+15.13%+15.13%—
2y11(11 pending)——————
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 · 49,636 shares · as of May 18, 2026
013,01326,02539,03852,0502026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2025
2025
2025
2026
2026
FLOW · 1 buys / 12 sellsCOVERAGE · 5 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
2,414$9.13$22.0K49,636May 18, 2026May 20, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
20,300——52,050Mar 9, 2026Mar 11, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
1,603$5.08$8.1K32,227Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
24$5.08$12233,830Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
100$5.08$50831,750Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
377$5.08$1.9K31,850Mar 2, 2026Mar 4, 2026 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
74$13.19$97633,454Nov 17, 2025Nov 19, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
85$13.19$1.1K33,528Nov 17, 2025Nov 19, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
1,645$13.19$21.7K33,613Nov 17, 2025Nov 19, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
1,668$11.61$19.4K35,258Aug 18, 2025Aug 20, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
55$11.61$63837,012Aug 18, 2025Aug 20, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
86$11.61$99936,926Aug 18, 2025Aug 20, 2025 ↗View →
ATRA
ATARA BIOTHERAPEUTICS, INC.
SALE
Chief Accounting Officer
2,218$6.76$15.0K37,067May 16, 2025May 20, 2025 ↗View →
Other insiders · ATRA
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About this filer
CIK 0002064348
ROLE
Chief Accounting Officer
PRIMARY
ATRA
COMPANIES
1
ACTIVE SINCE
May 2025
MARKETPEEL · /INSIDER/0002064348DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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