EcoR1 Capital, LLC Insider Trading Activity

Average Profitability
31.33%
Insider Buys Quantity
66
Insider Buys Sum
$301.09M
Insider Sells Quantity
8
Insider Sells Sum
$71.48M

Insider Activity of EcoR1 Capital, LLC

According to the SEC Form 4 filings, EcoR1 Capital, LLC, being in a position of

  1. 10 percent owner at Atara Biotherapeutics, Inc.,
    оver the last 12 months, has bought 507407 shares for $4.74M, and sold 0 shares,
    over all time since 2026-05-07, has bought 507407 shares for $4.74M, and sold 0 shares.

Biography of EcoR1 Capital, LLC

No biography is available at this moment.

Statistics of Insider Transactions Last Year

Amount of Insider Buys and Sells by Stocks

Buys
 $4,744,2551100
Sells
 $000

Comparison of Insiders on Amount of Buys and Sells

2026-05-07PurchaseAtara Biotherapeutics, Inc.
ATRA
10 percent owner
507,407
5.6127%
$9.35$4.74M-5.54%
2025-05-19PurchaseZymeworks Inc.
ZYME
5,919
0.0085%
$11.78$69,738+86.29%
2025-05-15PurchaseZymeworks Inc.
ZYME
49,502
0.0704%
$11.43$565,847+68.08%
2025-05-06SaleProthena Corporation plc
PRTA
10 percent owner
1.98M
3.8331%
$7.64$15.16M+23.4%
2025-05-05SaleProthena Corporation plc
PRTA
10 percent owner
977,693
1.8234%
$8.11$7.93M+12.13%
2025-05-02SaleProthena Corporation plc
PRTA
10 percent owner
3.32M
6.0641%
$8.36$27.74M+6.35%
2025-04-17PurchaseZymeworks Inc.
ZYME
54,760
0.0869%
$11.52$630,819+55.38%
2025-04-16PurchaseZymeworks Inc.
ZYME
73,953
0.1138%
$11.16$825,589+58.4%
2025-04-04PurchaseZymeworks Inc.
ZYME
196,438
0.288%
$11.17$2.19M+54.34%
2025-04-03PurchaseZymeworks Inc.
ZYME
120,770
0.1749%
$11.84$1.43M+42.89%
2025-04-02PurchaseZymeworks Inc.
ZYME
74,360
0.1062%
$11.85$881,017+39.93%
2025-04-01PurchaseZymeworks Inc.
ZYME
48,658
0.0698%
$11.60$564,647+43.55%
2025-03-31PurchaseZymeworks Inc.
ZYME
4,397
0.0062%
$11.75$51,658+39.38%
2025-03-26PurchaseZymeworks Inc.
ZYME
43,848
0.0625%
$12.24$536,857+33.52%
2025-03-25PurchaseZymeworks Inc.
ZYME
53,501
0.0775%
$12.91$690,452+28.59%
2025-03-24PurchaseZymeworks Inc.
ZYME
22,689
0.0327%
$13.08$296,847+25.36%
2025-03-21PurchaseZymeworks Inc.
ZYME
31,033
0.0448%
$12.78$396,518+28.22%
2025-03-20PurchaseZymeworks Inc.
ZYME
73,476
0.1056%
$12.93$949,883+26.06%
2025-03-19PurchaseZymeworks Inc.
ZYME
58,306
0.0828%
$12.64$737,233+27.05%
2025-03-18PurchaseZymeworks Inc.
ZYME
113,880
0.1678%
$12.65$1.44M+30.96%
Total: 80
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