![Patrick O'brien](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Patrick O'brien
Chief Operating Officer at
ARROWHEAD PHARMACEUTICALS, INC.
Net worth: 43 M $ as of 2026-05-30
Profile
Patrick C. O'brien founded Obrien Gould Pllc. Currently, he is Secretary & Chief Compliance Office at Arrowhead Pharmaceuticals, Inc. In the past he was Partner at Holland & Knight LLP, Partner at Burke Oneil LLC, Vice President-Law at Johnson & Johnson and Vice President-Law at Centocor Ortho Biotech, Inc. (a subsidiary of Johnson & Johnson), Group Vice President-Law at Shire, Inc. and Regulatory Counsel at US Food & Drug Administration. Dr. O'brien received a graduate degree, a doctorate and an undergraduate degree from the University of Arizona.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-01-14 | 547,408 ( 0.39% ) | 43 M $ | 2026-05-30 |
Patrick O'brien active positions
| Companies | Position | Start |
|---|---|---|
| ARROWHEAD PHARMACEUTICALS, INC. | Chief Operating Officer | 2022-07-14 |
Former positions of Patrick O'brien
| Companies | Position | End |
|---|---|---|
Shire, Inc.
 Shire, Inc. Pharmaceuticals: MajorHealth Technology Develops and markets medicines for patients with rare diseases | General Counsel | 2013-12-31 |
Burke Oneil LLC
 Burke Oneil LLC Miscellaneous Commercial ServicesCommercial Services Provides legal services | Corporate Officer/Principal | 2009-12-31 |
Janssen Biotech, Inc.
 Janssen Biotech, Inc. Pharmaceuticals: MajorHealth Technology Manufactures pharmaceutical products | General Counsel | 2008-12-31 |
| JOHNSON & JOHNSON | General Counsel | 2008-12-31 |
US Food & Drug Administration
 US Food & Drug Administration General GovernmentGovernment Operates agencies to protect health and human services | General Counsel | - |
Training of Patrick O'brien
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
21
1st degree connections
9
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 9 |
|---|---|
Johnson & Johnson
 Johnson & Johnson Pharmaceuticals: MajorHealth Technology Operates as an investment holding company with interests in health care products | Health Technology |
Arrowhead Pharmaceuticals, Inc.
 Arrowhead Pharmaceuticals, Inc. BiotechnologyHealth Technology Develops novel drugs to treat intractable diseases | Health Technology |
Holland & Knight LLP
 Holland & Knight LLP Miscellaneous Commercial ServicesCommercial Services Provides legal services | Commercial Services |
University of Arizona
 University of Arizona Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
US Food & Drug Administration
US Food & Drug Administration General GovernmentGovernment Operates agencies to protect health and human services | Government |
Janssen Biotech, Inc.
Janssen Biotech, Inc. Pharmaceuticals: MajorHealth Technology Manufactures pharmaceutical products | Health Technology |
Shire, Inc.
Shire, Inc. Pharmaceuticals: MajorHealth Technology Develops and markets medicines for patients with rare diseases | Health Technology |
Obrien Gould Pllc
 Obrien Gould Pllc Miscellaneous Commercial ServicesCommercial Services Provides legal services | Commercial Services |
Burke Oneil LLC
Burke Oneil LLC Miscellaneous Commercial ServicesCommercial Services Provides legal services | Commercial Services |
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