EcoR1 Capital, LLC
- SEC CIK
- 0001587114
In the past year, 2 open-market purchase filings worth $44.7M and 1 sale filing worth $65.0M.
Current role at each company
- ATRA Atara Biotherapeutics, Inc.10% Owneras of May 11, 2026
- TRAX First Tracks Biotherapeutics, Inc.10% Owneras of Apr 22, 2026
- AKTS Aktis Oncology, Inc.Directoras of Jan 12, 2026
- ADAPY Adaptimmune Therapeutics PLC10% Owneras of Jul 30, 2025
- ZYME Zymeworks Inc.Director, 10% Owneras of Jun 27, 2025
Show 10 more companies
- ITOS iTeos Therapeutics, Inc.10% Owneras of May 16, 2025
- PRTA Prothena Corp Public Ltd Co10% Owneras of May 6, 2025
- ANAB Anaptysbio, IncDirector, 10% Owneras of Jan 2, 2025
- MRSN Mersana Therapeutics, Inc.10% Owneras of Dec 23, 2024
- TNGX Tango Therapeutics, Inc.10% Owneras of Nov 8, 2024
- NUVB Nuvation Bio Inc.Directoras of Sep 22, 2023
- Panacea Acquisition Corp. IIDirector, 10% Owneras of May 2, 2023
- VYGR Voyager Therapeutics, Inc.10% Owneras of Jan 11, 2023
- ODT Odonate Therapeutics, Inc.10% Owneras of Dec 10, 2021
- CRVS Corvus Pharmaceuticals, Inc.10% Owneras of Oct 1, 2021
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- $44.7M
- 2 filings
- Sold
- $65.0M
- 1 filing
- Net
- −$20.2M
- Bought minus sold
- Companies
- 3
- With open-market trades
Trades
Every Form 4 that lists EcoR1 Capital, LLC as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
ATRA Atara Biotherapeutics, Inc.
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| May 11, 2026 (view filing) | May 7 | 4 days | EcoR1 Capital, LLC10% Owner | PPurchase | +507.4K | $9.35 | +$4.74M | +48.6%1.55M after |
TRAX First Tracks Biotherapeutics, Inc.
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Apr 22, 2026 (view filing) | Apr 20 | 2 days | EcoR1 Capital, LLC10% Owner | SSale | +4.71M | $13.81 | +$65.0M | New position3.17M after |
AKTS Aktis Oncology, Inc.
Director1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jan 12, 2026 (view filing)8:28 PM ET | Jan 12 | Same day | Nodelman Oleg and 1 otherDirector | PPurchase | +2.22M | $18.00 | +$40.0M | New position347.3K after | 2 lots |
ADAPY Adaptimmune Therapeutics PLC
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jul 30, 2025 (view filing)6:20 PM ET | Jul 28-30 | 2 days | EcoR1 Capital, LLC10% Owner | SSale | −64.1M | $0.1076 | −$6.89M | −39.0%100.4M after | 3 lotsPrice outlier |
ZYME Zymeworks Inc.
Director, 10% Owner20 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jan 12, 2023 (view filing) | Jan 10-11 | 2 days | EcoR1 Capital, LLC10% Owner | PPurchase | +1.03M | $7.67 | +$7.87M | +13.6%8.59M after | 2 lots |
| Jan 18, 2023 (view filing) | Jan 13-18 | 5 days | EcoR1 Capital, LLC10% Owner | PPurchase | +985.1K | $9.84 | +$9.70M | +11.5%9.58M after | 3 lots |
| Jan 23, 2023 (view filing) | Jan 19-20 | 4 days | EcoR1 Capital, LLC10% Owner | PPurchase | +307.5K | $9.70 | +$2.98M | +3.2%9.89M after | 2 lots |
| Mar 30, 2023 (view filing) | Mar 28 | 2 days | EcoR1 Capital, LLC10% Owner | PPurchase | +200.0K | $8.00 | +$1.60M | +2.0%10.1M after | |
| Jun 21, 2023 (view filing) | Jun 16 | 5 days | EcoR1 Capital, LLC10% Owner | PPurchase | +3.35M | $8.12 | +$27.2M | +33.2%13.4M after | |
| Dec 28, 2023 (view filing) | Dec 26 | 2 days | EcoR1 Capital, LLC10% Owner | PPurchase | +5.09M | $9.83 | +$50.0M | –5.09M after | Derivative |
| Dec 26, 2024 (view filing) | Dec 19-23 | 7 days | EcoR1 Capital, LLCDirector, 10% Owner | PPurchase | +1.25M | $13.98 | +$17.5M | +9.3%14.7M after | Amended3 lots |
| Dec 27, 2024 (view filing) | Dec 24-27 | 3 days | EcoR1 Capital, LLCDirector, 10% Owner | PPurchase | +130.3K | $14.44 | +$1.88M | +0.9%14.8M after | 3 lots |
| Jan 2, 2025 (view filing) | Dec 30, 2024-Jan 2, 2025 | 3 days | EcoR1 Capital, LLCDirector, 10% Owner | PPurchase | +363.4K | $14.65 | +$5.32M | +2.5%15.2M after | 3 lots |
| Jan 10, 2025 (view filing) | Jan 8-10 | 2 days | EcoR1 Capital, LLCDirector, 10% Owner | PPurchase | +225.1K | $13.22 | +$2.98M | +1.5%15.4M after | 2 lots |
ITOS iTeos Therapeutics, Inc.
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| May 16, 2025 (view filing) | May 14-15 | 2 days | EcoR1 Capital, LLC10% Owner | PPurchase | +4.96M | $7.80 | +$38.7M | +86.5%10.7M after | 2 lots |
PRTA Prothena Corp Public Ltd Co
10% Owner4 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jan 12, 2022 (view filing) | Jan 12 | Same day | EcoR1 Capital, LLC10% Owner | PPurchase | +300.0K | $37.50 | +$11.3M | +2.7%11.6M after | |
| May 9, 2022 (view filing) | May 5 | 4 days | EcoR1 Capital, LLC10% Owner | PPurchase | +1.06M | $29.02 | +$30.8M | +10.1%11.6M after | |
| May 9, 2022 (view filing) | May 5 | 4 days | EcoR1 Capital, LLC10% Owner | SSale | −1.06M | $29.02 | −$30.8M | −8.4%11.6M after | |
| May 6, 2025 (view filing) | May 2-6 | 4 days | EcoR1 Capital, LLC10% Owner | SSale | −6.28M | $8.09 | −$50.8M | −54.2%5.30M after | 3 lots |
ANAB Anaptysbio, Inc
Director, 10% Owner4 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| May 9, 2022 (view filing)6:04 AM ET | May 5 | 4 days | Nodelman Oleg and 1 otherDirector, 10% Owner | PPurchase | +668.2K | $21.63 | +$14.5M | +9.8%7.52M after | |
| May 9, 2022 (view filing)6:04 AM ET | May 5 | 4 days | Nodelman Oleg and 1 otherDirector, 10% Owner | SSale | −668.2K | $21.63 | −$14.5M | −8.2%7.52M after | |
| Aug 16, 2024 (view filing) | Aug 14 | 2 days | EcoR1 Capital, LLC10% Owner | PPurchase | +274.0K | $36.50 | +$10.0M | +3.6%7.79M after | |
| Jan 2, 2025 (view filing)6:17 PM ET | Dec 30, 2024-Jan 2, 2025 | 3 days | Nodelman Oleg and 1 otherDirector, 10% Owner | PPurchase | +85.1K | $12.92 | +$1.10M | +1.1%7.88M after | 3 lots |
TNGX Tango Therapeutics, Inc.
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Nov 8, 2024 (view filing) | Nov 6-7 | 2 days | EcoR1 Capital, LLC10% Owner | SSale | −2.70M | $3.13 | −$8.45M | −20.3%10.6M after | 3 lots |
NUVB Nuvation Bio Inc.
Director4 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Nov 30, 2021 (view filing)6:07 PM ET | Mar 31-Nov 24 | 244 daysLate | Nodelman Oleg and 5 othersDirector | PPurchaseClass A Common Stock | +393.2K | $8.89 | +$3.49M | +50.7%1.17M after | 4 lots |
| Nov 30, 2021 (view filing)6:07 PM ET | Mar 31 | 244 daysLate | Nodelman Oleg and 5 othersDirector | SSaleClass A Common Stock | +151.5K | $10.45 | +$1.58M | +15.2%1.15M after | |
| Nov 30, 2021 (view filing)6:07 PM ET | Jul 31 | 122 daysLate | Nodelman Oleg and 5 othersDirector | SSaleClass A Common Stock | −56.6K | $8.64 | −$489.0K | −4.7%1.15M after | |
| Sep 22, 2023 (view filing)3:44 PM ET | Sep 19-21 | 3 days | Nodelman Oleg and 5 othersDirector | PPurchaseClass A Common Stock | +5.31M | $1.26 | +$6.69M | +72.2%12.7M after | Amended3 lots |
VYGR Voyager Therapeutics, Inc.
10% Owner2 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jun 23, 2022 (view filing) | Jun 21-23 | 2 days | EcoR1 Capital, LLC10% Owner | PPurchase | +477.4K | $5.58 | +$2.66M | +11.2%4.75M after | 2 lots |
| Jan 11, 2023 (view filing) | Jan 9-11 | 2 days | EcoR1 Capital, LLC10% Owner | SSale | −902.4K | $7.91 | −$7.14M | −19.0%3.85M after | 3 lots |
ODT Odonate Therapeutics, Inc.
10% Owner2 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Dec 10, 2021 (view filing) | Dec 1 | 9 daysLate | EcoR1 Capital, LLC10% Owner | PPurchase | +185.9K | $1.66 | +$308.7K | +3.4%5.70M after | |
| Dec 10, 2021 (view filing) | Dec 1-10 | 9 daysLate | EcoR1 Capital, LLC10% Owner | SSale | −5.89M | $1.65 | −$9.74M | −100.0%0 after | 4 lots |
CRVS Corvus Pharmaceuticals, Inc.
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Oct 1, 2021 (view filing) | Sep 30-Oct 1 | 1 day | EcoR1 Capital, LLC10% Owner | SSale | −5.00M | $5.01 | −$25.0M | −98.4%81.1K after | 2 lots |