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Avidity Partners Management LP

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

Total Filings

91

Stocks Covered

35

Latest Filing

Nov 14, 2025

Filings

Altimmune Inc.

SC 13G/A · Feb 14, 2023

8.1%

4.0M shares

Syndax Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2023

9.7%

6.7M shares

Kezar Life Sciences, Inc.

SC 13G/A · Feb 14, 2023

9.9%

6.8M shares

IDEAYA Biosciences, Inc.

SC 13G/A · Feb 14, 2023

7.9%

3.8M shares

Alpine Immune Sciences, Inc.

SC 13G/A · Feb 14, 2023

4.0%

1.9M shares

Karyopharm Therapeutics Inc.

SC 13G/A · Feb 14, 2023

9.9%

11.4M shares

Gritstone bio, Inc.

SC 13G/A · Feb 14, 2023

3.3%

2.9M shares

Akero Therapeutics, Inc.

SC 13G/A · Feb 14, 2023

8.2%

3.8M shares

Cyteir Therapeutics, Inc.

SC 13G/A · Feb 14, 2023

5.1%

1.8M shares

PhaseBio Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2023

4.1%

2.0M shares

Phathom Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2023

4.6%

1.9M shares

Arvinas, Inc.

SC 13G/A · Feb 14, 2023

9.3%

5.0M shares

IVERIC bio, Inc.

SC 13G/A · Feb 14, 2023

0.6%

838K shares

N/A

Oncosec Medical Incorporated

SC 13G/A · Feb 14, 2023

0.0%

0 shares

Adicet Bio, Inc.

SC 13G/A · Feb 14, 2023

0.0%

0 shares

Viridian Therapeutics, Inc.

SC 13G/A · Feb 14, 2023

0.0%

0 shares

Zentalis Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2023

9.0%

5.2M shares

Praxis Precision Medicines, Inc.

SC 13G · Feb 2, 2023

8.7%

4.1M shares

Karyopharm Therapeutics Inc.

SC 13G · Dec 8, 2022

9.9%

11.4M shares

ESSA Pharma Inc.

SC 13G · Oct 27, 2022

8.5%

3.8M shares

Syros Pharmaceuticals, Inc.

SC 13G · Sep 20, 2022

9.9%

2.1M shares

Akero Therapeutics, Inc.

SC 13G · Sep 16, 2022

6.9%

3.1M shares

Arvinas, Inc.

SC 13G · Jun 16, 2022

6.1%

3.2M shares

IDEAYA Biosciences, Inc.

SC 13G/A · Feb 14, 2022

6.6%

2.6M shares

Syndax Pharmaceuticals, Inc.

SC 13G/A · Feb 12, 2022

9.9%

5.2M shares

Scynexis, Inc.

SC 13G/A · Feb 12, 2022

9.3%

2.2M shares

Oncosec Medical Incorporated

SC 13G/A · Feb 12, 2022

7.5%

2.9M shares

Alpine Immune Sciences, Inc.

SC 13G/A · Feb 12, 2022

7.3%

2.2M shares

Viridian Therapeutics, Inc.

SC 13G/A · Feb 12, 2022

5.9%

1.3M shares

PhaseBio Pharmaceuticals, Inc.

SC 13G/A · Feb 12, 2022

9.2%

4.4M shares

IVERIC bio, Inc.

SC 13G/A · Feb 12, 2022

6.1%

7.0M shares

Gritstone bio, Inc.

SC 13G/A · Feb 12, 2022

9.9%

7.0M shares

Cardiff Oncology, Inc.

SC 13G/A · Feb 12, 2022

0.0%

0 shares

Anika Therapeutics, Inc.

SC 13G/A · Feb 11, 2022

0.0%

0 shares

Adicet Bio, Inc.

SC 13G/A · Feb 11, 2022

7.9%

3.0M shares

SeaSpine Holdings Corporation

SC 13G · Feb 11, 2022

5.5%

2.0M shares

Phathom Pharmaceuticals, Inc.

SC 13G · Feb 11, 2022

6.0%

1.9M shares

Cyteir Therapeutics, Inc.

SC 13G · Feb 11, 2022

5.2%

1.8M shares

Zentalis Pharmaceuticals, Inc.

SC 13G · Feb 1, 2022

6.7%

3.0M shares

Kezar Life Sciences, Inc.

SC 13G · Jan 3, 2022

6.6%

3.2M shares

Altimmune Inc.

SC 13G · Jan 3, 2022

7.0%

2.8M shares