Quick Takeaways
- Patrick O'Brien has 1 issuer position tracked on this page.
- Estimated disclosed ownership value: $36,342,471.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Patrick O'Brien
- Location
- Pasadena, CA
- Summary
- The estimated net worth of Patrick O'Brien is at least $36,342,471 dollars as of 08 Jan 2026. Patrick O'Brien is the COO of ARROWHEAD PHARMACEUTICALS, INC. and owns shares of ARROWHEAD PHARMACEUTICALS, INC. (ARWR) stock worth about $36.34M.
- Signature
- /s/Patrick O'Brien
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Patrick O'Brien and return when a new Insider Trading filing changes the record on this page.
This uses the existing product follow flow to surface future filing-backed changes without guessing what they mean.
What Changed
- Largest disclosed position: ARROWHEAD PHARMACEUTICALS, INC. ($36,342,471).
- Past-year value change for that position: -$3,123,349.
Why This Matters
- This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
- You can cross-check role, issuer, and filing chronology directly against the SEC source.
Source Evidence
Filed on Form 4
See Original Filing
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
Ownership of Patrick O'Brien
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| ARWR | ARROWHEAD PHARMACEUTICALS, INC. | Coo | $36,342,471 | -$3,123,349 | -7.9% | 06 Jan 2026 |
Insider Transactions Reported by Patrick O'Brien:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.