---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-23-003560"
form_type: "8-K"
ticker: "ARWR"
cik: "0000879407"
company_name: "ARROWHEAD PHARMACEUTICALS, INC."
filed_at: "2023-02-14T23:59:59+00:00"
generated_at: "2026-06-19T15:00:57.545976+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Director Marianne De Backer resigns from Arrowhead board effective April 2, 2023

## Summary
- Marianne De Backer notified Arrowhead of her resignation as director, effective April 2, 2023.
- De Backer served as independent director, on Audit, Compensation, and as Chair of Nomination Committee.
- Resignation due to her appointment as CEO and director of Vir Biotechnology; no disagreement with Arrowhead.

## SEC filing metadata
- accession: 0001628280-23-003560
- form_type: 8-K
- ticker: ARWR
- cik: 0000879407
- company_name: ARROWHEAD PHARMACEUTICALS, INC.
- filed_at: 2023-02-14T23:59:59+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/879407/000162828023003560/0001628280-23-003560-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/879407/000162828023003560/arwr-20230211.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-23-003560
- JSON: https://secwatch.observer/filing/0001628280-23-003560.json
- Plain text: https://secwatch.observer/filing/0001628280-23-003560.txt

## Key facts
- Executive change
  Marianne De Backer resigned as director at ARROWHEAD PHARMACEUTICALS, INC..
  - Action: resigned
  - Role: director
  source text: On February 11, 2023, Marianne De Backer , a director of Arrowhead Pharmaceuticals, Inc. (the “Company”), notified the Company of her decision to resign as a director, effective as of April 2, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/879407/000162828023003560/0001628280-23-003560-index.htm

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