---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-22-019124"
form_type: "8-K"
ticker: "ARWR"
cik: "0000879407"
company_name: "ARROWHEAD PHARMACEUTICALS, INC."
filed_at: "2022-07-20T23:59:59+00:00"
generated_at: "2026-06-24T11:52:58.498109+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Arrowhead appoints Patrick O'Brien as COO and General Counsel effective July 15, 2022

## Summary
- Patrick O'Brien (age 59) named Chief Operating Officer and General Counsel, effective July 15, 2022.
- He retains roles as Chief Compliance Officer and Corporate Secretary.
- O'Brien joined Arrowhead in December 2014 and previously served as General Counsel.
- Over 25 years healthcare legal experience, including positions at Shire, Johnson & Johnson, and the FDA.

## SEC filing metadata
- accession: 0001628280-22-019124
- form_type: 8-K
- ticker: ARWR
- cik: 0000879407
- company_name: ARROWHEAD PHARMACEUTICALS, INC.
- filed_at: 2022-07-20T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/879407/000162828022019124/0001628280-22-019124-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/879407/000162828022019124/arwr-20220715.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-22-019124
- JSON: https://secwatch.observer/filing/0001628280-22-019124.json
- Plain text: https://secwatch.observer/filing/0001628280-22-019124.txt

## Key facts
- Executive change
  Patrick O'Brien was appointed as Chief Operating Officer and General Counsel at ARROWHEAD PHARMACEUTICALS, INC..
  - Action: appointed
  - Role: Chief Operating Officer and General Counsel
  source text: Arrowhead Pharmaceuticals, Inc. (the “Company”) has appointed Patrick O’Brien, age 59, as Chief Operating Officer and General Counsel effective as of July 15, 2022.
  evidence_url: https://www.sec.gov/Archives/edgar/data/879407/000162828022019124/0001628280-22-019124-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.