---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-24-005998"
form_type: "8-K"
ticker: "ARWR"
cik: "0000879407"
company_name: "ARROWHEAD PHARMACEUTICALS, INC."
filed_at: "2024-02-22T23:59:59+00:00"
generated_at: "2026-06-05T21:25:24.194911+00:00"
event_type: "leadership"
sentiment: "positive"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# Arrowhead appoints Hongbo Lu to board; expands to 8 members

## Summary
- Hongbo Lu, Ph.D., appointed as independent director effective April 1, 2024, increasing board from 7 to 8.
- Lu brings over 20 years of healthcare investment experience, including Managing Partner at Vivo Capital and LAV.
- She receives standard non-employee director compensation plus sign-on RSU grant valued at $761,666 vesting over three years.
- No family relationships or material interests with Arrowhead directors or officers disclosed.

## SEC filing metadata
- accession: 0001628280-24-005998
- form_type: 8-K
- ticker: ARWR
- cik: 0000879407
- company_name: ARROWHEAD PHARMACEUTICALS, INC.
- filed_at: 2024-02-22T23:59:59+00:00
- event_type: leadership
- sentiment: positive
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/879407/000162828024005998/0001628280-24-005998-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/879407/000162828024005998/arwr-20240221.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-24-005998
- JSON: https://secwatch.observer/filing/0001628280-24-005998.json
- Plain text: https://secwatch.observer/filing/0001628280-24-005998.txt

## Key facts
- Executive change
  Hongbo Lu was appointed as Director at ARROWHEAD PHARMACEUTICALS, INC..
  - Action: appointed
  - Role: Director
  source text: On February 21, 2024, the Board of Directors of Arrowhead Pharmaceuticals, Inc. (the “Company”) announced that it would increase the size of the Company's board of directors ("Board") from seven to eight members and appoint Hongbo Lu, Ph.D., as an independent director of the Company, effective April 1, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/879407/000162828024005998/0001628280-24-005998-index.htm

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