EcoR1 Capital, LLC (CIK 0001587114)

Latest company ownership

Shares held
100,371,882
Last filed at
Jul 30, 2025
Confidence Score
43.7
2025Q4
Confidence Score History
2025Q3 2025Q4
NUVB - Nuvation Bio Inc.
Role: Director
Shares held
12,674,775
Last filed at
Sep 22, 2023
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q3 2025Q4
Shares held
10,630,736
Last filed at
Nov 8, 2024
Confidence Score
49.9
2025Q4
Confidence Score History
2024Q4 2025Q4
ANAB - ANAPTYSBIO, INC
Role: Director
Shares held
7,880,094
Last filed at
Jan 2, 2025
Confidence Score
50.1
2025Q4
Confidence Score History
2021Q1 2025Q4
Shares held
5,304,596
Last filed at
May 6, 2025
Confidence Score
48.4
2025Q4
Confidence Score History
2021Q1 2025Q4
ZYME - Zymeworks Inc.
Role: Director
Shares held
5,086,521
Last filed at
Jun 27, 2025
Confidence Score
53.1
2025Q4
Confidence Score History
2023Q1 2025Q4
Shares held
3,851,507
Last filed at
Jan 11, 2023
Confidence Score
50.0
2025Q4
Confidence Score History
2022Q2 2025Q4
Shares held
81,077
Last filed at
Oct 1, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q3 2025Q4

Recent buy/sell transactions

Exec date Filing date Company Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Jul 28, 2025 Jul 30, 2025 Adaptimmune Therapeutics PLC 10% Owner Sell 16.3 -64,052,538 -38.96% ✗ $6.9M
Jun 26, 2025 Jun 27, 2025 Zymeworks Inc. Director Sell 52.5 -41 0.00% ✗ $521.1
May 15, 2025 May 19, 2025 Zymeworks Inc. Director Buy 67.5 +55,421 0.31% ✗ $635.6K
May 2, 2025 May 6, 2025 PROTHENA CORP PUBLIC LTD CO 10% Owner Sell 15.0 -6,279,684 -54.21% ✗ $50.8M
Apr 16, 2025 Apr 18, 2025 Zymeworks Inc. Director Buy 77.5 +128,713 0.73% ✗ $1.5M
Apr 3, 2025 Apr 7, 2025 Zymeworks Inc. Director Buy 87.5 +317,208 1.82% ✗ $3.6M
Mar 31, 2025 Apr 2, 2025 Zymeworks Inc. Director Buy 77.5 +127,415 0.74% ✗ $1.5M
Mar 25, 2025 Mar 27, 2025 Zymeworks Inc. Director Buy 77.5 +97,349 0.57% ✗ $1.2M
Mar 20, 2025 Mar 24, 2025 Zymeworks Inc. Director Buy 77.5 +127,198 0.75% ✗ $1.6M
Mar 17, 2025 Mar 19, 2025 Zymeworks Inc. Director Buy 87.5 +228,463 1.36% ✗ $2.9M
Mar 11, 2025 Mar 13, 2025 Zymeworks Inc. Director Buy 97.5 +1,081,980 6.88% ✗ $13.1M
Jan 16, 2025 Jan 21, 2025 Zymeworks Inc. Director Buy 77.5 +141,429 0.91% ✗ $2M
Jan 13, 2025 Jan 15, 2025 Zymeworks Inc. Director Buy 87.5 +167,654 1.09% ✗ $2.3M
Jan 8, 2025 Jan 10, 2025 Zymeworks Inc. Director Buy 87.5 +225,119 1.48% ✗ $3M
Dec 30, 2024 Jan 2, 2025 ANAPTYSBIO, INC Director Buy 87.5 +85,098 1.09% ✗ $1.1M
Dec 30, 2024 Jan 2, 2025 Zymeworks Inc. Director Buy 88.8 +363,369 2.45% ✗ $5.3M
Dec 24, 2024 Dec 27, 2024 Zymeworks Inc. Director Buy 77.5 +130,309 0.89% ✗ $1.9M
Dec 19, 2024 Dec 26, 2024 Zymeworks Inc. Director Buy 97.5 +1,254,808 9.34% ✗ $17.5M
Nov 6, 2024 Nov 8, 2024 Tango Therapeutics, Inc. 10% Owner Sell 16.3 -2,700,000 -20.25% ✗ $8.4M
Aug 14, 2024 Aug 16, 2024 ANAPTYSBIO, INC 10% Owner Buy 93.8 +273,972 3.64% ✗ $10M
Sep 19, 2023 Sep 22, 2023 Nuvation Bio Inc. Director Buy 100.0 +5,313,100 72.17% ✗ $6.7M
Feb 19, 2023 Sep 21, 2023 Nuvation Bio Inc. Director Buy 100.0 +5,313,100 72.17% ✗ $6.7M
Jun 16, 2023 Jun 21, 2023 Zymeworks Inc. 10% Owner Buy 100.0 +3,350,000 33.21% ✗ $27.2M
Mar 28, 2023 Mar 30, 2023 Zymeworks Inc. 10% Owner Buy 87.5 +200,000 2.02% ✗ $1.6M
Jan 19, 2023 Jan 23, 2023 Zymeworks Inc. 10% Owner Buy 92.5 +307,500 3.21% ✗ $3M
Jan 13, 2023 Jan 18, 2023 Zymeworks Inc. 10% Owner Buy 100.0 +985,100 11.46% ✗ $9.7M
Jan 10, 2023 Jan 12, 2023 Zymeworks Inc. 10% Owner Buy 100.0 +1,026,300 13.56% ✗ $7.9M
Jan 9, 2023 Jan 11, 2023 Voyager Therapeutics, Inc. 10% Owner Sell 16.3 -902,400 -18.98% ✗ $7.1M
Jun 21, 2022 Jun 23, 2022 Voyager Therapeutics, Inc. 10% Owner Buy 100.0 +477,400 11.16% ✗ $2.7M
Jan 12, 2022 Jan 12, 2022 PROTHENA CORP PUBLIC LTD CO 10% Owner Buy 95.0 +300,000 2.66% ✗ $11.3M
Mar 31, 2021 Nov 30, 2021 Nuvation Bio Inc. Other Buy 87.5 +488,114 1.65% ✗ $4.6M
Sep 30, 2021 Oct 1, 2021 Corvus Pharmaceuticals, Inc. 10% Owner Sell 15.0 -5,000,000 -98.40% ✗ $25.1M
Apr 30, 2021 May 4, 2021 ANAPTYSBIO, INC Director Buy 93.8 +221,500 3.03% ✗ $5.1M
Apr 23, 2021 Apr 27, 2021 ANAPTYSBIO, INC Director Buy 87.5 +147,300 2.06% ✗ $3.5M
Apr 9, 2021 Apr 13, 2021 Nuvation Bio Inc. 10% Owner Buy 92.5 +464,500 3.51% ✗ $4.6M
Mar 24, 2021 Mar 25, 2021 PROTHENA CORP PUBLIC LTD CO 10% Owner Buy 97.5 +875,000 8.61% ✗ $18.2M
Mar 8, 2021 Mar 10, 2021 ANAPTYSBIO, INC 10% Owner Buy 100.0 +3,308,800 86.10% ✗ $62.6M
Feb 23, 2021 Feb 25, 2021 PROTHENA CORP PUBLIC LTD CO 10% Owner Buy 77.5 +55,200 0.55% ✗ $1.2M
Feb 23, 2021 Feb 25, 2021 ANAPTYSBIO, INC 10% Owner Buy 75.0 +29,500 0.77% ✗ $751.7K
Feb 18, 2021 Feb 23, 2021 PROTHENA CORP PUBLIC LTD CO 10% Owner Buy 70.0 +44,100 0.44% ✗ $1M
Feb 18, 2021 Feb 22, 2021 PROTHENA CORP PUBLIC LTD CO 10% Owner Buy 65.0 +44,100 0.44% ✗ $162.1K
Feb 12, 2021 Feb 17, 2021 PROTHENA CORP PUBLIC LTD CO 10% Owner Buy 97.5 +633,340 6.72% ✗ $13.7M
Jul 6, 2020 Jul 6, 2020 Nuvation Bio Inc. Director Buy 100.0 +390,000 100.00% ✗ $3.9M