---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-089029"
form_type: "8-K"
ticker: "CERS"
cik: "0001020214"
company_name: "CERUS CORP"
filed_at: "2025-06-23T23:59:59+00:00"
generated_at: "2026-05-18T23:16:02.051279+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Cerus board chair Swisher retires; CEO Greenman named chair, Witney lead independent director

## Summary
- Daniel N. Swisher, Jr., chair of the board, retired effective June 16, 2025; no disagreement with the company.
- William M. Greenman, President and CEO, appointed chair of the board effective June 20, 2025.
- Frank Witney, Ph.D., appointed lead independent director, effective June 20, 2025.
- Swisher also left all board committees upon retirement.

## SEC filing metadata
- accession: 0000950170-25-089029
- form_type: 8-K
- ticker: CERS
- cik: 0001020214
- company_name: CERUS CORP
- filed_at: 2025-06-23T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1020214/000095017025089029/0000950170-25-089029-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1020214/000095017025089029/cers--8-k--swisher_resig.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-089029
- JSON: https://secwatch.observer/filing/0000950170-25-089029.json
- Plain text: https://secwatch.observer/filing/0000950170-25-089029.txt

## Key facts
- Executive change
  William M. Greenman was appointed as Chair of the Board at CERUS CORP.
  - Action: appointed
  - Role: Chair of the Board
  source text: on June 20, 2025, the Board appointed William M. Greenman, the Company’s President and Chief Executive Officer and a member of the class of directors whose terms of office expire at the Company’s 2026 annual meeting of stockholders, to serve as chair of the Board
  evidence_url: https://www.sec.gov/Archives/edgar/data/1020214/000095017025089029/0000950170-25-089029-index.htm
- Executive change
  Daniel N. Swisher, Jr. retired as Chair of the Board at CERUS CORP.
  - Action: retired
  - Role: Chair of the Board
  source text: On June 16, 2025, Daniel N. Swisher, Jr., chair of the board of directors (the “Board”) of Cerus Corporation (the “Company”), notified the Company of his intent to retire from the Board and all committees thereof on which he served, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1020214/000095017025089029/0000950170-25-089029-index.htm

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