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PRIMECAP Management Company 95-3868081

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

Total Filings

105

Stocks Covered

40

Latest Filing

Nov 12, 2024

Filings

Southwest Airlines Co.

SC 13G/A · Feb 9, 2023

8.8%

52.2M shares

Pulmonx Corp

SC 13G/A · Feb 9, 2023

14.7%

5.5M shares

United Airlines Holdings, Inc.

SC 13G/A · Feb 9, 2023

7.4%

24.1M shares

Rhythm Pharmaceuticals, Inc.

SC 13G/A · Feb 9, 2023

12.3%

6.9M shares

Whirlpool Corp

SC 13G/A · Feb 9, 2023

8.8%

4.8M shares

Calithera Biosciences, Inc.

SC 13G/A · Feb 9, 2023

4.1%

200K shares

Arlo Technologies, Inc.

SC 13G/A · Feb 9, 2023

5.5%

4.8M shares

Nektar Therapeutics

SC 13G/A · Feb 9, 2023

8.3%

15.7M shares

LivaNova PLC

SC 13G/A · Feb 9, 2023

8.6%

4.6M shares

BioMarin Pharmaceutical Inc.

SC 13G/A · Feb 9, 2023

9.5%

17.6M shares

Raymond James Financial, Inc.

SC 13G · Feb 9, 2023

6.1%

13.1M shares

Flex Ltd.

SC 13G/A · Feb 9, 2023

11.5%

51.9M shares

Cerus Corp

SC 13G/A · Jan 9, 2023

5.0%

8.8M shares

comScore, Inc.

SC 13G/A · Jan 9, 2023

3.1%

2.9M shares

Xencor, Inc.

SC 13G/A · Dec 8, 2022

10.1%

6.0M shares

Wave Life Sciences Ltd.

SC 13G/A · Dec 8, 2022

4.9%

4.2M shares

Stratasys Ltd.

SC 13G/A · Dec 8, 2022

4.8%

3.2M shares

Calithera Biosciences, Inc.

SC 13G/A · Dec 8, 2022

8.3%

406K shares

NN, Inc.

SC 13G/A · Nov 9, 2022

4.0%

1.8M shares

Epizyme, Inc.

SC 13G/A · Sep 8, 2022

0.0%

0 shares

Plantronics, Inc.

SC 13G/A · Sep 8, 2022

0.0%

0 shares

Epizyme, Inc.

SC 13G/A · Aug 9, 2022

9.3%

15.6M shares

Jacobs Engineering Group Inc.

SC 13G/A · Jun 9, 2022

5.0%

6.4M shares

Xencor, Inc.

SC 13G/A · Feb 10, 2022

8.5%

5.0M shares

Whirlpool Corp

SC 13G/A · Feb 10, 2022

8.3%

5.0M shares

Wave Life Sciences Ltd.

SC 13G/A · Feb 10, 2022

7.8%

4.6M shares

United Airlines Holdings, Inc.

SC 13G/A · Feb 10, 2022

7.8%

25.4M shares

Transocean Ltd.

SC 13G/A · Feb 10, 2022

7.3%

47.5M shares

Stratasys Ltd.

SC 13G/A · Feb 10, 2022

5.8%

3.8M shares

Southwest Airlines Co.

SC 13G/A · Feb 10, 2022

9.2%

54.3M shares

ServiceSource International, Inc.

SC 13G/A · Feb 10, 2022

8.3%

8.2M shares

Rhythm Pharmaceuticals, Inc.

SC 13G/A · Feb 10, 2022

12.4%

6.3M shares

Pulmonx Corp

SC 13G/A · Feb 10, 2022

13.4%

4.9M shares

Plantronics, Inc.

SC 13G/A · Feb 10, 2022

14.8%

6.3M shares

NN, Inc.

SC 13G/A · Feb 10, 2022

6.4%

2.8M shares

NetApp, Inc.

SC 13G/A · Feb 10, 2022

8.2%

18.3M shares

Nektar Therapeutics

SC 13G/A · Feb 10, 2022

9.4%

17.4M shares

Mattel, Inc.

SC 13G/A · Feb 10, 2022

13.0%

45.6M shares

LivaNova PLC

SC 13G/A · Feb 10, 2022

8.3%

4.4M shares

Jacobs Engineering Group Inc.

SC 13G/A · Feb 10, 2022

5.2%

6.7M shares

iRobot Corp

SC 13G/A · Feb 10, 2022

9.0%

2.4M shares

Fluidigm Corp

SC 13G/A · Feb 10, 2022

6.7%

5.1M shares

Flex Ltd.

SC 13G/A · Feb 10, 2022

11.7%

55.0M shares

FibroGen, Inc.

SC 13G/A · Feb 10, 2022

14.0%

13.0M shares

FedEx Corp

SC 13G/A · Feb 10, 2022

5.0%

13.2M shares

Elanco Animal Health Inc

SC 13G/A · Feb 10, 2022

6.4%

30.2M shares

comScore, Inc.

SC 13G/A · Feb 10, 2022

6.6%

5.4M shares

Cerus Corp

SC 13G/A · Feb 10, 2022

5.6%

9.7M shares

Calithera Biosciences, Inc.

SC 13G/A · Feb 10, 2022

14.3%

10.7M shares

BioMarin Pharmaceutical Inc.

SC 13G/A · Feb 10, 2022

9.7%

17.8M shares