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Rock Springs Capital Management LP

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

Total Filings

52

Stocks Covered

22

Latest Filing

Sep 12, 2025

Filings

TALPHERA, INC.

SC 13G · Sep 12, 2025

7.9%

3.6M shares

Inozyme Pharma, Inc.

SC 13G/A · Aug 13, 2025

0.0%

0 shares

Spruce Biosciences, Inc.

SC 13G/A · Aug 13, 2025

0.0%

0 shares

Xilio Therapeutics, Inc.

SC 13G/A · May 15, 2025

0.0%

0 shares

Travere Therapeutics, Inc.

SC 13G/A · May 15, 2025

3.3%

2.9M shares

MEREO BIOPHARMA GROUP PLC

SC 13G/A · May 15, 2025

4.2%

33.4M shares

Aclaris Therapeutics, Inc.

SC 13G/A · May 15, 2025

4.7%

5.0M shares

Travere Therapeutics, Inc.

SC 13G/A · Feb 14, 2025

5.7%

5.0M shares

Aclaris Therapeutics, Inc.

SC 13G · Nov 22, 2024

6.3%

6.8M shares

Xilio Therapeutics, Inc.

SC 13G/A · Nov 12, 2024

6.8%

3.0M shares

MEREO BIOPHARMA GROUP PLC

SC 13G/A · Nov 12, 2024

6.2%

47.7M shares

Immunocore Holdings plc

SC 13G/A · Nov 12, 2024

0.0%

0 shares

Travere Therapeutics, Inc.

SC 13G · May 1, 2024

5.8%

4.4M shares

Xilio Therapeutics, Inc.

SC 13G/A · Apr 5, 2024

8.7%

3.0M shares

Xilio Therapeutics, Inc.

SC 13G · Feb 14, 2024

5.2%

1.4M shares

Tempest Therapeutics, Inc.

SC 13G/A · Feb 14, 2024

0.0%

0 shares

Spruce Biosciences, Inc.

SC 13G/A · Feb 14, 2024

6.4%

2.6M shares

MEREO BIOPHARMA GROUP PLC

SC 13G/A · Feb 14, 2024

5.7%

39.9M shares

MEREO BIOPHARMA GROUP PLC

SC 13G/A · Feb 14, 2024

6.4%

39.9M shares

Inozyme Pharma, Inc.

SC 13G/A · Feb 14, 2024

6.0%

3.7M shares

Immunocore Holdings plc

SC 13G/A · Feb 14, 2024

5.4%

2.7M shares

Gamida Cell Ltd.

SC 13G/A · Feb 14, 2024

0.0%

0 shares

Spyre Therapeutics, Inc.

SC 13G/A · Feb 14, 2024

0.0%

0 shares

AGIOS PHARMACEUTICALS, INC.

SC 13G/A · Feb 14, 2024

3.9%

2.2M shares

Aclaris Therapeutics, Inc.

SC 13G/A · Feb 14, 2024

4.2%

3.0M shares

Sierra Oncology, Inc.

SC 13G/A · Feb 14, 2023

0.0%

0 shares

PhaseBio Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2023

0.0%

0 shares

Mirum Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2023

4.9%

1.8M shares

Compass Therapeutics, Inc.

SC 13G/A · Feb 14, 2023

4.2%

5.3M shares

Tempest Therapeutics, Inc.

SC 13G/A · Feb 14, 2023

7.8%

824K shares

Spruce Biosciences, Inc.

SC 13G/A · Feb 14, 2023

6.9%

1.6M shares

MEREO BIOPHARMA GROUP PLC

SC 13G/A · Feb 14, 2023

5.3%

31.2M shares

Inozyme Pharma, Inc.

SC 13G/A · Feb 14, 2023

7.6%

3.1M shares

Immunocore Holdings plc

SC 13G/A · Feb 14, 2023

7.3%

3.3M shares

AEGLEA BIOTHERAPEUTICS, INC.

SC 13G · Feb 14, 2023

5.5%

3.4M shares

AGIOS PHARMACEUTICALS, INC.

SC 13G · Feb 14, 2023

5.5%

3.0M shares

Aclaris Therapeutics, Inc.

SC 13G/A · Feb 14, 2023

5.9%

4.0M shares

Inozyme Pharma, Inc.

SC 13G · Apr 25, 2022

6.1%

2.5M shares

MEREO BIOPHARMA GROUP PLC

SC 13G · Feb 15, 2022

5.1%

5.6M shares

Protara Therapeutics, Inc.

SC 13G/A · Feb 14, 2022

0.0%

0 shares

F-star Therapeutics, Inc.

SC 13G/A · Feb 14, 2022

3.6%

752K shares

Five Prime Therapeutics, Inc.

SC 13G/A · Feb 14, 2022

0.0%

0 shares

Chiasma, Inc.

SC 13G/A · Feb 14, 2022

0.0%

0 shares

ARDELYX, INC.

SC 13G/A · Feb 14, 2022

0.0%

0 shares

Sierra Oncology, Inc.

SC 13G/A · Feb 14, 2022

7.9%

1.2M shares

Spruce Biosciences, Inc.

SC 13G/A · Feb 14, 2022

6.9%

1.6M shares

PhaseBio Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2022

5.4%

2.6M shares

Mirum Pharmaceuticals, Inc.

SC 13G/A · Feb 14, 2022

5.0%

1.5M shares

Immunocore Holdings plc

SC 13G/A · Feb 14, 2022

5.6%

2.5M shares

Compass Therapeutics, Inc.

SC 13G/A · Feb 14, 2022

5.4%

5.3M shares