EcoR1 Capital, LLC
Atara Biotherapeutics, Inc. · 10% Owner
EcoR1 Capital, LLC is listed in public filings as 10 percent owner. This EcoR1 Capital, LLC insider trading page organizes Form 4 disclosures, reported purchases and sales, transaction dates, share amounts, related issuers, and historical insider activity so readers can review the person's public trading record in one place. Companies and tickers connected to this insider trading profile include Atara Biotherapeutics, Inc. (ATRA), Adaptimmune Therapeutics plc (ADAPY), Zymeworks Inc. (ZYME), iTeos Therapeutics, Inc. (ITOS), and Prothena Corporation plc (PRTA). Investors use EcoR1 Capital, LLC's insider trading disclosures to study buying and selling patterns, position changes, company-specific activity, and the source evidence behind each reported transaction.
Latest Actions
| Company | Holding Value | Last Transaction | Amount | Current Price | |
|---|---|---|---|---|---|
| $15M1.6M shares | BuyMay 7, 2026 | $4.7M507.4k shares | $9.35 | -- |
Insider Trades History
| Company | Holding Value | Last Transaction | Amount | Transaction Price | Current Price |
|---|---|---|---|---|---|
| $10M100.4M shares | SellJul 30, 2025 | $2.8M27.4M shares | $0.1021 | -- | |
| $13M127.8M shares | SellJul 29, 2025 | $272.0K2.7M shares | $0.1012 | -- | |
| $15M130.5M shares | SellJul 28, 2025 | $3.8M33.9M shares | $0.1125 | -- | |
| $292M23M shares | Grant / ExerciseJun 26, 2025 | $52141 shares | $12.71 | -- | |
| $05.1M shares | OtherJun 26, 2025 | $5095.1M shares | $0.0001 | -- | |
| $2.3k23M shares | OtherJun 26, 2025 | $5095.1M shares | $0.0001 | -- | |
| $211M17.9M shares | BuyMay 19, 2025 | $69.7K5.9k shares | $11.78 | -- | |
| $86M10.7M shares | BuyMay 15, 2025 | $26.4M3.3M shares | $8.00 | -- | |
| $204M17.9M shares | BuyMay 15, 2025 | $565.8K49.5k shares | $11.43 | -- | |
| $55M7.4M shares | BuyMay 14, 2025 | $12.3M1.7M shares | $7.41 | -- | |
| $41M5.3M shares | SellMay 6, 2025 | $15.2M2M shares | $7.64 | -- | |
| $59M7.3M shares | SellMay 5, 2025 | $7.9M977.7k shares | $8.11 | -- | |
| $69M8.3M shares | SellMay 2, 2025 | $27.7M3.3M shares | $8.36 | -- | |
| $205M17.8M shares | BuyApr 17, 2025 | $630.8K54.8k shares | $11.52 | -- | |
| $198M17.8M shares | BuyApr 16, 2025 | $825.6K74k shares | $11.16 | -- | |
| $198M17.7M shares | BuyApr 4, 2025 | $2.2M196.4k shares | $11.17 | -- | |
| $207M17.5M shares | BuyApr 3, 2025 | $1.4M120.8k shares | $11.84 | -- | |
| $206M17.4M shares | BuyApr 2, 2025 | $881.0K74.4k shares | $11.85 | -- | |
| $201M17.3M shares | BuyApr 1, 2025 | $564.6K48.7k shares | $11.60 | -- | |
| $203M17.3M shares | BuyMar 31, 2025 | $51.7K4.4k shares | $11.75 | -- | |
| $211M17.3M shares | BuyMar 26, 2025 | $536.9K43.8k shares | $12.24 | -- | |
| $222M17.2M shares | BuyMar 25, 2025 | $690.5K53.5k shares | $12.91 | -- | |
| $224M17.2M shares | BuyMar 24, 2025 | $296.8K22.7k shares | $13.08 | -- | |
| $219M17.1M shares | BuyMar 21, 2025 | $396.5K31k shares | $12.78 | -- | |
| $221M17.1M shares | BuyMar 20, 2025 | $949.9K73.5k shares | $12.93 | -- | |
| $215M17M shares | BuyMar 19, 2025 | $737.2K58.3k shares | $12.64 | -- | |
| $215M17M shares | BuyMar 18, 2025 | $1.4M113.9k shares | $12.65 | -- | |
| $206M16.9M shares | BuyMar 17, 2025 | $688.5K56.3k shares | $12.23 | -- | |
| $210M16.8M shares | BuyMar 13, 2025 | $5.8M468.4k shares | $12.48 | -- | |
| $200M16.3M shares | BuyMar 12, 2025 | $3.6M292.9k shares | $12.25 | -- | |
| $184M16M shares | BuyMar 11, 2025 | $3.7M320.7k shares | $11.49 | -- | |
| $218M15.7M shares | BuyJan 17, 2025 | $274.0K19.7k shares | $13.87 | -- | |
| $218M15.7M shares | BuyJan 16, 2025 | $1.7M121.7k shares | $13.89 | -- | |
| $218M15.6M shares | BuyJan 15, 2025 | $546.7K39k shares | $14.01 | -- | |
| $211M15.5M shares | BuyJan 14, 2025 | $739.3K54.5k shares | $13.56 | -- | |
| $207M15.5M shares | BuyJan 13, 2025 | $992.9K74.1k shares | $13.39 | -- | |
| $202M15.4M shares | BuyJan 10, 2025 | $2.7M204.1k shares | $13.13 | -- | |
| $214M15.2M shares | BuyJan 8, 2025 | $295.8K21k shares | $14.07 | -- | |
| $224M15.2M shares | BuyJan 2, 2025 | $2.3M157.9k shares | $14.78 | -- | |
| $102M7.9M shares | BuyJan 2, 2025 | $86.1K6.6k shares | $12.95 | -- | |
| $219M15M shares | BuyDec 31, 2024 | $2.1M146.5k shares | $14.57 | -- | |
| $102M7.9M shares | BuyDec 31, 2024 | $171.5K13.3k shares | $12.93 | -- | |
| $215M14.9M shares | BuyDec 30, 2024 | $853.3K59k shares | $14.47 | -- | |
| $102M7.9M shares | BuyDec 30, 2024 | $842.1K65.2k shares | $12.92 | -- | |
| $215M14.8M shares | BuyDec 27, 2024 | $1.5M101.7k shares | $14.49 | -- | |
| $212M14.7M shares | BuyDec 26, 2024 | $240.0K16.7k shares | $14.38 | -- | |
| $208M14.7M shares | BuyDec 24, 2024 | $168.9K12k shares | $14.12 | -- | |
| $209M14.7M shares | BuyDec 23, 2024 | $3.6M251.5k shares | $14.25 | -- | |
| $203M14.4M shares | BuyDec 20, 2024 | $9.9M704.5k shares | $14.08 | -- | |
| $186M13.7M shares | BuyDec 19, 2024 | $4.0M298.8k shares | $13.53 | -- | |
| $31M10.6M shares | SellNov 7, 2024 | $3.3M1.1M shares | $2.92 | -- | |
| $39M11.8M shares | SellNov 7, 2024 | $205.1K62.3k shares | $3.29 | -- | |
| $39M11.8M shares | SellNov 6, 2024 | $4.9M1.5M shares | $3.28 | -- | |
| $285M7.8M shares | BuyAug 14, 2024 | $10.0M274k shares | $36.50 | -- |