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EcoR1 Capital, LLC
10% OwnerCIK 0001587114
Total Volume
$116.6M
7 filings
Purchases
$44.7M
3 buy txns
Sales
$71.9M
4 sell txns
Net Activity
-$27.1M
net sold
Profile
- Filings
- 7
- Buy transactions
- 3
- Sell transactions
- 4
- Companies
- 4
- Active
- 2025–2026
EcoR1 Capital, LLC, 10% Owner, accounts for 7 disclosed filings worth $116.6M, spread across 4 companies, active 2025–2026. The record is a roughly balanced mix of buying and selling, with $44.7M in purchases against $71.9M in sales. The largest single open-market purchase on record is $40.0M in Aktis Oncology, Inc.. Data is sourced from official SEC Form 3, 4, and 5 filings.
Associated Companies
Trading History
7 loaded
| May 11 | ATRA Atara Biotherapeutics, Inc. | EcoR1 Capital, LLC | 10% Owner | Other | $0 |
| May 11 | ATRA Atara Biotherapeutics, Inc. | EcoR1 Capital, LLC | 10% Owner | Buy | $4.7M |
| Apr 22 | TRAX First Tracks Biotherapeutics, Inc. | EcoR1 Capital, LLC | 10% Owner | Other | $0 |
| Apr 22 | TRAX First Tracks Biotherapeutics, Inc. | EcoR1 Capital, LLC | 10% Owner | Sell | $65.0M |
| Jan 12 | AKTS Aktis Oncology, Inc. | EcoR1 Capital, LLC | Director | Buy | $40.0M |
| Jan 8 | AKTS Aktis Oncology, Inc. | EcoR1 Capital, LLC | Director, 10% Owner | Other | $0 |
| Jul 30 | ADAP Adaptimmune Therapeutics PLC | EcoR1 Capital, LLC | 10% Owner | Sell | $6.9M |
7 filings