EcoR1 Capital, LLC

Track

Insider profile

Performance

Overall performance
3.1
Performance over holding periods
4.2
30 days 90 days 120 days
Average return 11% 8.2% 15.1%
Success rate 69% 68% 82%
Transactions
82 79% Buy
34 71% Buy
47 69% Buy
Ranking by holding-period performance
Performance for realised trades
4.4
Average return -23%
Success rate 73%
Average holding period 220
Transactions 28
Ranking by realised performance
EcoR1 Capital, LLC's trades of Atara Biotherapeutics Inc's stock


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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date Company B/S Transaction type Nb. shares
Price
Value 		Number of shares Price Value Details
2026-05-11 2026-05-07
B Purchase
55,928 -2.6%
313.44
US$4,151,822 		55,928 -2.6% 313.44 US$4,151,822
2026-01-12 2026-01-12
B Purchase
46,627 +25.5%
295.27
US$1,924,805 		46,627 +25.5% 295.27 US$1,924,805
2026-01-12 2026-01-12
B Purchase
16,461 -42.8%
115.94
US$1,315,930 		16,461 -42.8% 115.94 US$1,315,930
2025-07-30 2025-07-30
S Sale
27,433,338 -21.5%
0.10
US$2,800,944 		27,433,338 -21.5% 0.10 US$2,800,944
2025-07-30 2025-07-29
S Sale
2,687,460 -2.1%
0.10
US$271,971 		2,687,460 -2.1% 0.10 US$271,971
2025-07-30 2025-07-28
S Sale
33,931,740 -20.6%
0.11
US$3,817,321 		33,931,740 -20.6% 0.11 US$3,817,321
2025-05-19 2025-05-19
US Zymeworks Inc (ZYME)
B Purchase
5,919 +0.0%
11.78
US$69,738 		5,919 +0.0% 11.78 US$69,738
2025-05-19 2025-05-15
US Zymeworks Inc (ZYME)
B Purchase
49,502 +0.3%
11.43
US$565,847 		49,502 +0.3% 11.43 US$565,847
2025-05-16 2025-05-15
B Purchase
3,300,000 +44.7%
8.00
US$26,400,000 		3,300,000 +44.7% 8.00 US$26,400,000
2025-05-16 2025-05-14
B Purchase
1,658,978 +29.0%
7.41
US$12,285,562 		1,658,978 +29.0% 7.41 US$12,285,562
2025-05-06 2025-05-06
S Sale
1,984,053 -27.2%
7.64
US$15,164,712 		1,984,053 -27.2% 7.64 US$15,164,712
2025-05-06 2025-05-05
S Sale
977,693 -11.8%
8.11
US$7,930,166 		977,693 -11.8% 8.11 US$7,930,166
2025-05-06 2025-05-02
S Sale
3,317,938 -28.6%
8.36
US$27,744,929 		3,317,938 -28.6% 8.36 US$27,744,929
2025-04-18 2025-04-17
US Zymeworks Inc (ZYME)
B Purchase
54,760 +0.3%
11.52
US$630,819 		54,760 +0.3% 11.52 US$630,819
2025-04-18 2025-04-16
US Zymeworks Inc (ZYME)
B Purchase
73,953 +0.4%
11.16
US$825,589 		73,953 +0.4% 11.16 US$825,589
2025-04-07 2025-04-04
US Zymeworks Inc (ZYME)
B Purchase
196,438 +1.1%
11.17
US$2,193,800 		196,438 +1.1% 11.17 US$2,193,800
2025-04-07 2025-04-03
US Zymeworks Inc (ZYME)
B Purchase
120,770 +0.7%
11.84
US$1,430,170 		120,770 +0.7% 11.84 US$1,430,170
2025-04-02 2025-04-02
US Zymeworks Inc (ZYME)
B Purchase
74,360 +0.4%
11.85
US$881,017 		74,360 +0.4% 11.85 US$881,017
2025-04-02 2025-04-01
US Zymeworks Inc (ZYME)
B Purchase
48,658 +0.3%
11.60
US$564,647 		48,658 +0.3% 11.60 US$564,647
2025-04-02 2025-03-31
US Zymeworks Inc (ZYME)
B Purchase
4,397 +0.0%
11.75
US$51,658 		4,397 +0.0% 11.75 US$51,658
2025-03-27 2025-03-26
US Zymeworks Inc (ZYME)
B Purchase
43,848 +0.3%
12.24
US$536,857 		43,848 +0.3% 12.24 US$536,857
2025-03-27 2025-03-25
US Zymeworks Inc (ZYME)
B Purchase
53,501 +0.3%
12.91
US$690,452 		53,501 +0.3% 12.91 US$690,452
2025-03-24 2025-03-24
US Zymeworks Inc (ZYME)
B Purchase
22,689 +0.1%
13.08
US$296,847 		22,689 +0.1% 13.08 US$296,847
2025-03-24 2025-03-21
US Zymeworks Inc (ZYME)
B Purchase
31,033 +0.2%
12.78
US$396,518 		31,033 +0.2% 12.78 US$396,518
2025-03-24 2025-03-20
US Zymeworks Inc (ZYME)
B Purchase
73,476 +0.4%
12.93
US$949,883 		73,476 +0.4% 12.93 US$949,883
2025-03-19 2025-03-19
US Zymeworks Inc (ZYME)
B Purchase
58,306 +0.3%
12.64
US$737,233 		58,306 +0.3% 12.64 US$737,233
2025-03-19 2025-03-18
US Zymeworks Inc (ZYME)
B Purchase
113,880 +0.7%
12.65
US$1,440,855 		113,880 +0.7% 12.65 US$1,440,855
2025-03-19 2025-03-17
US Zymeworks Inc (ZYME)
B Purchase
56,277 +0.3%
12.23
US$688,465 		56,277 +0.3% 12.23 US$688,465
2025-03-13 2025-03-13
US Zymeworks Inc (ZYME)
B Purchase
468,356 +2.9%
12.48
US$5,847,237 		468,356 +2.9% 12.48 US$5,847,237
2025-03-13 2025-03-12
US Zymeworks Inc (ZYME)
B Purchase
292,934 +1.8%
12.25
US$3,587,826 		292,934 +1.8% 12.25 US$3,587,826
2025-03-13 2025-03-11
US Zymeworks Inc (ZYME)
B Purchase
320,690 +2.0%
11.49
US$3,685,851 		320,690 +2.0% 11.49 US$3,685,851
2025-01-21 2025-01-17
US Zymeworks Inc (ZYME)
B Purchase
19,748 +0.1%
13.87
US$273,998 		19,748 +0.1% 13.87 US$273,998
2025-01-21 2025-01-16
US Zymeworks Inc (ZYME)
B Purchase
121,681 +0.8%
13.89
US$1,689,541 		121,681 +0.8% 13.89 US$1,689,541
2025-01-15 2025-01-15
US Zymeworks Inc (ZYME)
B Purchase
39,029 +0.3%
14.01
US$546,671 		39,029 +0.3% 14.01 US$546,671
2025-01-15 2025-01-14
US Zymeworks Inc (ZYME)
B Purchase
54,500 +0.4%
13.56
US$739,265 		54,500 +0.4% 13.56 US$739,265
2025-01-15 2025-01-13
US Zymeworks Inc (ZYME)
B Purchase
74,125 +0.5%
13.39
US$992,875 		74,125 +0.5% 13.39 US$992,875
2025-01-10 2025-01-10
US Zymeworks Inc (ZYME)
B Purchase
204,098 +1.3%
13.13
US$2,678,990 		204,098 +1.3% 13.13 US$2,678,990
2025-01-10 2025-01-08
US Zymeworks Inc (ZYME)
B Purchase
21,021 +0.1%
14.07
US$295,829 		21,021 +0.1% 14.07 US$295,829
2025-01-02 2025-01-02
B Purchase
6,646 +0.1%
12.95
US$86,070 		6,646 +0.1% 12.95 US$86,070
2025-01-02 2025-01-02
US Zymeworks Inc (ZYME)
B Purchase
157,880 +1.1%
14.78
US$2,333,403 		157,880 +1.1% 14.78 US$2,333,403
2025-01-02 2024-12-31
B Purchase
13,268 +0.2%
12.93
US$171,513 		13,268 +0.2% 12.93 US$171,513
2025-01-02 2024-12-31
US Zymeworks Inc (ZYME)
B Purchase
146,501 +1.0%
14.57
US$2,134,446 		146,501 +1.0% 14.57 US$2,134,446
2025-01-02 2024-12-30
B Purchase
65,184 +0.8%
12.92
US$842,060 		65,184 +0.8% 12.92 US$842,060
2025-01-02 2024-12-30
US Zymeworks Inc (ZYME)
B Purchase
58,988 +0.4%
14.47
US$853,326 		58,988 +0.4% 14.47 US$853,326
2024-12-27 2024-12-27
US Zymeworks Inc (ZYME)
B Purchase
101,659 +0.7%
14.49
US$1,473,181 		101,659 +0.7% 14.49 US$1,473,181