Sign in Sign Up Free

EcoR1 Capital, LLC

Activist investor & 5%+ owner · SC 13D/13G filings

Total Filings

162

Stocks Covered

66

Latest Filing

Feb 17, 2026

Filings

uniQure N.V.

SC 13G/A · Feb 17, 2026

0.0%

0 shares

Tango Therapeutics, Inc.

SC 13G/A · Feb 17, 2026

0.0%

0 shares

Xencor Inc

SC 13G/A · Feb 17, 2026

6.4%

4.6M shares

Voyager Therapeutics, Inc.

SC 13G/A · Feb 17, 2026

6.8%

4.0M shares

Mereo BioPharma Group plc

SC 13G · Jan 9, 2026

9.4%

74.5M shares

iBio, Inc.

SC 13G · Dec 17, 2025

9.9%

2.2M shares

HilleVax, Inc.

SC 13G/A · Nov 14, 2025

0.0%

0 shares

Tectonic Therapeutic, Inc.

SC 13G/A · Nov 14, 2025

0.0%

0 shares

Atara Biotherapeutics, Inc.

SC 13G/A · Nov 14, 2025

9.9%

716K shares

Voyager Therapeutics, Inc.

SC 13G/A · Nov 14, 2025

6.8%

4.0M shares

Neurogene Inc.

SC 13G/A · Nov 14, 2025

9.9%

1.4M shares

Apellis Pharmaceuticals, Inc.

SC 13G/A · Nov 14, 2025

2.7%

3.4M shares

Adaptimmune Therapeutics PLC

SC 13G/A · Aug 19, 2025

4.2%

66.0M shares

Kura Oncology, Inc.

SC 13G/A · Aug 14, 2025

4.8%

4.2M shares

ORIC Pharmaceuticals, Inc.

SC 13G · Aug 5, 2025

6.9%

6.7M shares

HilleVax, Inc.

SC 13G · Jul 24, 2025

5.8%

2.9M shares

Third Harmonic Bio, Inc.

SC 13G/A · May 15, 2025

0.0%

0 shares

Tectonic Therapeutic, Inc.

SC 13G/A · May 15, 2025

5.0%

935K shares

TScan Therapeutics, Inc.

SC 13G/A · May 15, 2025

1.3%

663K shares

Mersana Therapeutics, Inc.

SC 13G/A · May 15, 2025

0.0%

0 shares

Kalaris Therapeutics, Inc.

SC 13G/A · May 15, 2025

1.1%

202K shares

Immunome Inc.

SC 13G/A · May 15, 2025

4.7%

4.1M shares

ARVINAS, INC.

SC 13G/A · May 15, 2025

0.0%

0 shares

Aligos Therapeutics, Inc.

SC 13G/A · May 15, 2025

3.9%

211K shares

iTeos Therapeutics, Inc.

SC 13G/A · May 13, 2025

14.9%

5.7M shares

iTeos Therapeutics, Inc.

SC 13G · May 8, 2025

6.9%

2.7M shares

N/A

Allovir, Inc.

SC 13G/A · Feb 14, 2025

8.1%

409K shares

Eton Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2025

7.7%

2.0M shares

Atea Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2025

4.0%

3.3M shares

Tango Therapeutics, Inc.

SC 13G/A · Feb 14, 2025

9.9%

10.6M shares

HOOKIPA Pharma Inc.

SC 13G/A · Feb 14, 2025

4.0%

389K shares

Aadi Bioscience, Inc.

SC 13G/A · Feb 14, 2025

1.4%

345K shares

Mersana Therapeutics, Inc.

SC 13G/A · Dec 24, 2024

10.0%

11.6M shares

uniQure N.V.

SC 13G · Dec 17, 2024

7.5%

3.6M shares

Eton Pharmaceuticals, Inc.

SC 13G · Dec 9, 2024

5.4%

1.4M shares

Atea Pharmaceuticals, Inc.

SC 13G/A · Nov 15, 2024

6.4%

5.4M shares

Edgewise Therapeutics, Inc.

SC 13G/A · Nov 14, 2024

1.3%

1.3M shares

Aligos Therapeutics, Inc.

SC 13G/A · Nov 14, 2024

10.0%

356K shares

Xencor, Inc.

SC 13G/A · Nov 14, 2024

9.4%

6.7M shares

Voyager Therapeutics, Inc.

SC 13G/A · Nov 14, 2024

10.0%

5.6M shares

Atara Biotherapeutics, Inc.

SC 13G/A · Nov 14, 2024

10.0%

493K shares

Hookipa Pharma Inc.

SC 13G/A · Nov 14, 2024

5.9%

572K shares

ITeos Therapeutics, Inc.

SC 13G/A · Nov 14, 2024

4.4%

1.6M shares

Ovid Therapeutics Inc.

SC 13G/A · Nov 14, 2024

0.0%

0 shares

ORIC Pharmaceuticals, Inc.

SC 13G/A · Nov 14, 2024

4.9%

3.4M shares

Crinetics Pharmaceuticals, Inc.

SC 13G/A · Nov 14, 2024

4.8%

4.3M shares

Centessa Pharmaceuticals PLC

SC 13G/A · Nov 14, 2024

2.9%

3.2M shares

Galapagos NV

SC 13D/A · Oct 8, 2024

10.8%

7.1M shares

Aadi Bioscience, Inc.

SC 13G · Sep 3, 2024

7.5%

1.8M shares

Galapagos NV

SC 13D · Aug 23, 2024

9.9%

6.5M shares